10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

_____________________________________________________________________________________________

FORM 10-K

_____________________________________________________________________________________________

(Mark One)

ýANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2018

OR

¨     TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission File Number 001-33963

_____________________________________________________________________________________________

Iridium Communications Inc.

(Exact name of registrant as specified in its charter)

_____________________________________________________________________________________________

Delaware (State or other jurisdiction of incorporation or organization) 26-1344998 (I.R.S. Employer Identification No.)

1750 Tysons Boulevard, Suite 1400, McLean, Virginia 22102

(Address of principal executive offices, including zip code)

703-287-7400

(Registrant’s telephone number, including area code)

Securities Registered Pursuant to Section 12(b) of the Act:

Title of Each Class	Name of Each Exchange on Which Registered
Common Stock, $0.001 par value	NASDAQ Global Select Market
6.75% Series B Cumulative Perpetual Convertible Preferred Stock, $0.0001 par value	NASDAQ Global Select Market

Securities Registered Pursuant to Section 12(g) of the Act: None

_________________________________________________

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes   ý    No   ☐

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.   Yes   ☐     No   ý

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes   ý     No   ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    

Yes   ý     No   ☐

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§ 229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.   ý

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	ý	Accelerated filer	☐
Non-accelerated filer	☐  (Do not check if a smaller reporting company)	Smaller Reporting Company	☐
		Emerging Growth Company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.   ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    

Yes   ☐     No   ý

The aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold as of June 29, 2018, the last business day of the registrant's most recently completed second fiscal quarter, was approximately$1,566.7 million.

The number of shares of the registrant’s common stock, par value $0.001 per share, outstanding as of February 22, 2019 was112,239,417.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive proxy statement for its 2019 annual meeting of stockholders to be filed pursuant to Regulation 14A with the Securities and Exchange Commission not later than 120 days after the registrant’s fiscal year end of December 31, 2018, are incorporated by reference into Part III of this Form 10-K.

IRIDIUM COMMUNICATIONS INC.

ANNUAL REPORT ON FORM 10-K

Year Ended December 31, 2018

TABLE OF CONTENTS

PART I
Item 1.	Business	2
Item 1A.	Risk Factors	25
Item 1B.	Unresolved Staff Comments	41
Item 2.	Properties	42
Item 3.	Legal Proceedings	42
Item 4.	Mine Safety Disclosures	42
PART II
Item 5.	Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	43
Item 6.	Selected Financial Data	44
Item 7.	Management's Discussion and Analysis of Financial Condition and Results of Operations	45
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	62
Item 8.	Financial Statements and Supplementary Data	63
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	98
Item 9A.	Controls and Procedures	98
Item 9B.	Other Information	101
PART III
Item 10.	Directors, Executive Officers and Corporate Governance	102
Item 11.	Executive Compensation	102
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	102
Item 13.	Certain Relationships and Related Party Transactions, and Director Independence	102
Item 14.	Principal Accountant Fees and Services	102
PART IV
Item 15.	Exhibits and Financial Statement Schedules	103
Item 16.	Form 10-K Summary	110
	SIGNATURES	111

Forward-Looking Statements

This report contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. For this purpose, any statements contained herein that are not statements of historical fact may be deemed to be forward-looking statements. Such forward-looking statements include those that express plans, anticipation, intent, contingencies, goals, targets or future developments or otherwise are not statements of historical fact. Without limiting the foregoing, the words “believes,” “anticipates,” “plans,” “expects,” “intends” and similar expressions are intended to identify forward-looking statements. These forward-looking statements are based on our current expectations and projections about future events, and they are subject to risks and uncertainties, known and unknown, that could cause actual results and developments to differ materially from those expressed or implied in such statements. The important factors discussed under the caption “Risk Factors” in this Form 10-K could cause actual results to differ materially from those indicated by forward-looking statements made herein. We undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

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PART I

Item 1. Business

Corporate Background

We were formed as GHL Acquisition Corp., a special purpose acquisition company, in November 2007, for the purpose of effecting a merger, capital stock exchange, asset acquisition, stock purchase, reorganization or other similar business combination. On February 21, 2008, we consummated our initial public offering. On September 29, 2009, we acquired, directly and indirectly, all the outstanding equity of Iridium Holdings LLC, or Iridium Holdings, and changed our name from GHL Acquisition Corp. to Iridium Communications Inc.

Iridium Holdings was formed under the laws of Delaware in 2000, and on December 11, 2000, Iridium Holdings, through its wholly owned subsidiary Iridium Satellite LLC, or Iridium Satellite, acquired certain satellite assets from Iridium LLC, a non-affiliated debtor in possession, pursuant to an asset purchase agreement.

Business Overview

We are the only commercial provider of communications services offering true global coverage, connecting people, organizations and assets to and from anywhere, in real time. Our unique L-band satellite network provides reliable communications services to regions of the world where terrestrial wireless or wireline networks do not exist or are limited, including remote land areas, open ocean, airways, the polar regions and regions where the telecommunications infrastructure has been affected by political conflicts or natural disasters.

We provide voice and data communications services to businesses, the U.S. and foreign governments, non-governmental organizations and consumers via our satellite network, which has an architecture of 66 operational satellites with in-orbit and ground spares and related ground infrastructure. We utilize an interlinked mesh architecture to route traffic across our satellite constellation using radio frequency crosslinks between satellites. This unique architecture minimizes the need for local ground facilities to support the constellation, which facilitates the global reach of our services and allows us to offer services in countries and regions where we have no physical presence.

In February 2019, we completed the replacement of our first-generation satellites with our Iridium^® NEXT satellite constellation, which supports higher data speeds for new products, including our recently introduced Iridium Certus^SM broadband service. Iridium NEXT is an approximately$3 billion project and maintains the same interlinked mesh architecture of our first-generation constellation, with66 operational satellites, as well as in-orbit and ground spares and is compatible with all end-user equipment. We financed the construction of Iridium NEXT with the substantial majority of funds from a $1.8 billion loan facility, or the Credit Facility, as well as cash and cash equivalents on hand and internally generated cash flows.

The Iridium NEXT constellation also hosts the Aireon^SM system, which will provide a global air traffic surveillance service through a series of automatic dependent surveillance-broadcast, or ADS-B, receivers on the Iridium NEXT satellites. We formed Aireon LLC in 2011, with subsequent investments from the air navigation service providers, or ANSPs, of Canada, Italy, Denmark, Ireland and the United Kingdom, to develop and market this service. Aireon has contracted to provide the service to our co-investors in Aireon and to other ANSPs around the world. Aireon is also offering the service to ANSP customers worldwide, including the U.S. Federal Aviation Administration, or FAA. The FAA recently announced that it will run operational trials of the Aireon system beginning in 2020. Aireon has also contracted to pay us a fee to host the ADS-B receivers on Iridium NEXT, as well as data service fees for the delivery of the air traffic surveillance data over the Iridium NEXT system. In addition, we have entered into an agreement with Harris Corporation, the manufacturer of the Aireon hosted payload, pursuant to which Harris pays us fees to allocate the remaining hosted payload capacity to its customers and data service fees on behalf of these customers.

Our commercial business, which we view as our primary source of long-term growth, is diverse and serves markets such as emergency services, maritime, aviation, government, utilities, oil and gas, mining, recreation, forestry, heavy equipment, construction and transportation. Many of our end users view our products and services as critical to their daily operations and integral to their communications and business infrastructure. For example, multinational corporations in various sectors use our services for business telephony, e-mail and data transfer, including telematics, and to provide mobile communications services for employees in areas inadequately served by other telecommunications networks. Commercial enterprises use our services to track assets in remote areas and provide telematics information such as location and engine diagnostics. Ship crews and passengers use our services for ship-to-shore calling, as well as to send and receive e-mail and data files, and to receive electronic media, weather reports, emergency bulletins and electronic charts. Shipping operators use our services to manage

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operations on board ships and to transmit data, such as course, speed and fuel stock. Aviation end users use our services for air-to-ground telephony and data communications for position reporting, emergency tracking, weather information, electronic flight bag updates and airline operational communications. We expect that Iridium Certus will drive future growth opportunities in our commercial business by providing end users an additional competitive broadband communication solution.

The U.S. government, directly and indirectly, has been and continues to be our largest single customer, generating$105.7 million in service and engineering and support service revenue, or20% of our total revenue, for the year ended December 31, 2018. This does not include revenue from the sale of equipment that may be ultimately purchased by U.S. or non-U.S. government agencies through third-party distributors, or airtime services purchased by U.S. or non-U.S. government agencies that are provided through our commercial gateway, as we lack specific visibility into these activities and the related revenue. We are operating under a multi-year, fixed-price contract with the U.S. government to provide satellite airtime services for an unlimited number of U.S. Department of Defense, or DoD, and other federal government subscribers. This contract had a total value of$400 million over its five-year term, through October 2018. The government has exercised its option to extend the contract for an additional six months, at the same pricing as the final year of the contract, until April 2019. We expect to enter into a new contract with the U.S. government to provide continuing satellite airtime services prior to the extended expiration of the current agreement.

The DoD owns and operates a dedicated gateway that is only compatible with our satellite network. The U.S. armed services, State Department, Department of Homeland Security, Federal Emergency Management Agency, or FEMA, Customs and Border Protection, and other U.S. government agencies, as well as other nations’ governmental agencies, use our voice and data services for a wide variety of applications. Our voice and data products are used for numerous primary and backup communications solutions, including logistical, administrative, morale and welfare, tactical, and emergency communications. In addition, our products are installed in ground vehicles, ships, and rotary and fixed-wing aircraft and are used for command-and-control and situational awareness purposes. Our satellite network provides increased network security to the DoD because traffic is routed across our satellite constellation before being brought down to earth through the dedicated, secure DoD gateway. The DoD has made, and continues to make, significant investments to upgrade its dedicated gateway, which is fully compatible with the Iridium NEXT constellation, and to purchase our voice and data devices, all of which are only compatible with our satellite network. In addition, the DoD continues to invest directly and indirectly in research and development and implementation support for additional services on our network, such as Distributed Tactical Communications Services, or DTCS, as well as Iridium Certus.

We sell our products and services to commercial end users primarily through a wholesale distribution network, encompassing approximately130 service providers, approximately230 value-added resellers, or VARs, and approximately90 value-added manufacturers, or VAMs, which create and sell technology that uses the Iridium network either directly to the end user or indirectly through other service providers, VARs or dealers. These distributors often integrate our products and services with other complementary hardware and software and have developed a broad suite of applications using our products and services to target specific lines of business. We expect that demand for our services will increase as more applications are developed and deployed that utilize our technology, including following our commercial launch of Iridium Certus services in January 2019.

At December 31, 2018, we had approximately1,121,000 billable subscribers worldwide, representing a16% increase compared to December 31, 2017. Total revenue increased from$448.0 million in 2017 to$523.0 million in 2018.

Industry

We compete in the mobile satellite services sector of the global communications industry. Mobile satellite services operators provide voice and data services to people and machines using a network of satellites and ground facilities. Mobile satellite services are intended to meet users’ needs for connectivity in all locations where terrestrial wireless and wireline communications networks do not exist, do not provide sufficient coverage, or are impaired. Further, many regions of the world benefit from satellite networks, such as rural and developing areas that lack adequate wireless or wireline networks, airways, ocean and polar regions where few alternatives exist, and regions where the telecommunications infrastructure has been affected by political conflicts or natural disasters.

Government organizations, including military and intelligence agencies and disaster response agencies, non-governmental organizations, and industrial operations and support teams depend on mobile and fixed voice and data satellite communications services on a regular basis. Businesses with global operations require reliable communications services when operating in remote locations around the world. Mobile satellite services users span many sectors, including emergency services, maritime, aviation, government, utilities, oil and gas, mining, recreation, forestry, heavy equipment, construction and transportation, among others. Many of our customers view satellite communications services as critical to their daily operations.

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We believe that increasing mobile penetration creates additional demand for mobile satellite services. According to a 2018 study by the GSM Association, total mobile connections, excluding cellular Internet of Things, or IoT, reached7.8 billion throughout the world as of the end of 2017 and are projected to reach9.0 billion by 2025.

We believe that growth in the terrestrial wireless industry has increased awareness of the need for reliable mobile voice and data communications services. In addition, despite significant penetration and competition, terrestrial wireless systems do not cover a large majority of the earth’s surface and are focused mainly in those areas where people live, excluding oceans and other remote regions where ships, airplanes and other remote assets may travel or be located. By offering mobile communications services with global voice and data coverage, mobile satellite service providers address the demand from businesses, governments and individuals for connectivity and reliability in locations not consistently served by wireline and wireless terrestrial networks.

The mobile satellite services industry also benefits from the continued development of innovative, lower-cost technology and applications integrating mobile satellite products and services, including the continued advancement of IoT. We believe that growth in demand for mobile satellite services is driven in large part by the declining cost of these services, the diminishing size and lower costs of voice, data and IoT devices, the rollout of new applications tailored to the specific needs of customers across a variety of markets, and a more favorable regulatory environment in international markets.

Communications industry sectors include:

• mobile satellite services, which provide customers with voice and data connectivity to mobile and fixed devices using ground facilities and networks of geostationary, or GEO, satellites, which are located approximately 22,300 miles above the equator, medium earth orbit satellites, which orbit between approximately 6,400 and 10,000 miles above the earth’s surface, or low earth orbit, or LEO, satellites, such as those in our constellation, which orbit between approximately 300 and 1,000 miles above the earth’s surface;

• fixed satellite services, which use GEO satellites to provide customers with broadband communications links between fixed points on the earth’s surface; and

• terrestrial services, which use a network of land-based equipment, including switching centers and radio base stations, to provide wireless or wireline connectivity and are complementary to satellite services.

Within the two major satellite sectors, fixed satellite services and mobile satellite services, operators differ significantly from each other with respect to size of antenna and types of services offered. Fixed satellite services providers, such as Intelsat S.A., Eutelsat Communications S.A. and SES S.A., are characterized by large, often stationary or fixed ground terminals that send and receive high-bandwidth signals to and from the satellite network for video and high-speed data customers and international telephone markets. By contrast, mobile satellite services providers, such as us, Inmarsat plc, Globalstar, Inc., and ORBCOMM Inc. focus more on voice and data services, where mobility and small-sized terminals are essential.

A LEO system, such as the system we operate, generally has lower transmission delays, or latency, than a GEO system, such as that operated by Inmarsat, due to the shorter distance signals have to travel, which also enables the use of smaller antennas on mobile devices. We believe the unique interlinked mesh architecture of our constellation, combined with the global footprint of our satellites, distinguishes us from regional LEO satellite operators such as Globalstar and ORBCOMM, by allowing us to route voice and data transmissions to and from anywhere on the earth’s surface without the need for local infrastructure. As a result, we are the only mobile satellite services operator offering real-time, low-latency services with true global coverage, including full coverage of the polar regions.

Our Competitive Strengths

• Our Constellation. Our new satellite constellation, Iridium NEXT, enables the development of new products and services, including our global broadband offering, Iridium Certus. Iridium NEXT also supports more capacity and higher speeds for new products, provides service continuity and compatibility with our earlier products, and supports Aireon’s aircraft tracking service, as well as other hosted payload missions.

• Attractive and growing markets. We believe that the mobile satellite services industry will continue to experience growth driven by the increasing awareness of the need for reliable mobile voice and data communications services, the lack of coverage by terrestrial wireless systems of most of the earth’s surface, and the continued development of innovative, lower cost technology, applications integrating mobile satellite products and services, and the continued

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development of the IoT. Only satellite providers can offer global coverage, and the satellite industry is characterized by significant financial, technological and regulatory barriers to entry.

• True global coverage. Our network provides true global coverage, which none of our competitors, whether LEO or GEO, can offer. Our network design of 66 operational satellites relies on an interlinked mesh architecture to transmit signals from satellite to satellite, which reduces the need for multiple local ground stations around the world and facilitates the global reach of our services. GEO satellites orbit above the earth’s equator, limiting their visibility to far northern or southern latitudes and polar regions. LEO satellites from operators like Globalstar and ORBCOMM use an architecture commonly referred to as “bent pipe,” which requires voice and data transmissions to be immediately routed to ground stations in the same region as the satellite and can only provide real-time service when they are within view of a ground station, limiting coverage to areas near where they have been able to license and locate ground infrastructure. The LEO design of our satellite constellation produces minimal voice and data transmission delays compared to GEO systems due to the shorter distance our signals have to travel, and LEO systems typically have smaller antenna requirements. As a result, we believe that we are well-positioned to capitalize on the growth in our industry from end users who require reliable, easy-to-use communications services in all locations.

• Wholesale distribution network. The specialized needs of our global end users span many markets, including emergency services, maritime, aviation, government, utilities, oil and gas, mining, recreation, forestry, heavy equipment, construction and transportation. We sell our products and services to commercial end users primarily through a wholesale distribution network of service providers, VARs and VAMs, which often specialize in a particular line of business. Our distributors use our products and services to develop innovative and integrated communications solutions for their target markets, embedding our technology in their products or combining our products with other technologies, such as GPS and terrestrial wireless technology. In addition to promoting innovation, our wholesale distribution model allows us to capitalize on the research and development expenditures of our distribution partners, while lowering overall customer acquisition costs and mitigating some risks, such as consumer relationship risks. By supporting these distributors as they develop new products, services and applications, we believe we create additional demand for our products and services and expand our target markets at a lower cost than would a more direct marketing model. We believe our distribution network can continue to grow with us and increase our market penetration. For example, we are using our wholesale distribution approach to introduce Iridium Certus services, with multiple VAMs developing Iridium Certus customer terminals for the maritime, aviation and terrestrial markets at their expense, and agreements with numerous service partners to sell, service and support Iridium Certus terminals and service to global customers across these markets.

• Strategic relationship with the U.S. government. The U.S. government is our largest single customer, and we have had a relationship with the DoD since our inception. We believe the DoD views our IoT devices, encrypted handset, DTCS and other products as mission-critical services and equipment. The DoD continues to make significant investments in a dedicated gateway on a U.S. government site to provide operational security and allow DoD handset and IoT users to communicate securely with other U.S. government communications equipment. This gateway is only compatible with our satellite network. In October 2013, we entered into a five-year, fixed-price contract with the U.S. government to provide satellite airtime services for an unlimited number of DoD and other federal government subscribers, with a total contract value of$400 million, which was recently extended by the government to April 2019. We have seen significant annual increases in the number of federal government subscribers during the term of this agreement. As a result, the average cost per user under this agreement has fallen, increasing the value of Iridium services to U.S. government customers. We expect to enter into a new contract with the U.S. government to provide continuing satellite airtime services prior to the expiry of the current agreement.

Our Business and Growth Strategies

• Leverage our largely fixed-cost infrastructure by growing our service revenue. Our business model is characterized by high capital costs, primarily incurred every 10 to 15 years, in connection with designing, building and launching new generations of our satellite constellation, like our recently completed Iridium NEXT program, and a low incremental cost of providing service to additional end users. We believe that service revenue will be our largest source of future growth and profits, and we intend to focus on growing both our commercial and government service revenue in order to leverage our largely fixed-cost infrastructure. In particular, we believe that competitive broadband data services through Iridium Certus and satellite IoT services, where we are engaging large, global enterprises as long-term customers for high-speed data and telematics solutions, represent our greatest opportunities for service revenue growth.

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• Expand our target markets through the development of new products and services. We believe that we can expand our target markets developing and offering a broader range of products and services, including a wider array of cost-effective and competitive broadband and IoT data services through Iridium Certus technology. Iridium Certus is a multi-service platform that can deliver a range of services, from voice to a high-throughput L-band data connection, at a range of competitive price points, data speeds, and terminal dimensions to meet an expanding set of customer requirements. Iridium Certus services will include background IP data, streaming IP data, high quality voice, messaging, and safety services, including Global Maritime Distress Safety System, or GMDSS, and Aeronautical Mobile Satellite Route Service, or AMSRS. We also recently began collaborating with Amazon Web Services on the development of Iridium CloudConnect, a cloud-based solution offering truly global coverage for IoT applications.

• Accelerate the development of personal communications capabilities. Part of our strategy for the development of personal mobile satellite communications is to allow users to connect to our network in more ways, including from devices such as smartphones, tablets and laptops through our Iridium GO!^® device; by making our technology more accessible and cost-effective for our distribution partners to integrate by licensing our core technologies; by adding new functionality, such as push-to-talk, or PTT, capability, allowing multiple users to participate in talk groups worldwide; by providing rugged, dependable devices and services; and by developing new services, such as Iridium Certus, that will take advantage of the improved capabilities of the Iridium NEXT constellation.

• Continue to expand our distribution network. We believe our wholesale distribution network lowers our costs and risks, and we plan to continue to selectively expand our network of service providers, VAMs and VARs and to expand our sales and distribution efforts geographically. We expect that our current and future value-added partners will continue to develop customized products, services and applications targeted to the land mobile, IoT, maritime, aviation and government markets. We believe these markets and the new service providers, VAMs and VARs who join our network as a result of new product offerings represent an attractive opportunity for continued subscriber growth.

• Continued growth in services provided to the DoD. In October 2013, we executed a five-year Enhanced Mobile Satellite Services, or EMSS, contract managed by Air Force Space Command, which was recently extended by the government to April 2019. Under the terms of this agreement, we provide Iridium airtime and airtime support to U.S. government and other authorized customers, including voice, low- and high-speed data, paging, broadcast, and distributed tactical communication services. The service fee under the EMSS contract is currently$88 million per year. We expect to enter into a new contract with the U.S. government to provide satellite airtime services prior to the expiry of the current agreement. In addition, other services such as Iridium Certus and satellite time and location service provide us with opportunities to offer new products and services to the U.S. government for an additional fee.

• Continue to support Aireon in the execution of its business plan. Aireon, which we formed in 2011, is our primary hosted payload customer. Aireon received subsequent investments from five ANSPs, NAV CANADA, Enav (Italy), NATS (United Kingdom), Naviair (Denmark) and the Irish Aviation Authority. Aireon has developed an ADS-B receiver which is hosted on the Iridium NEXT satellites and gathers ADS-B position information from aircraft to provide a global air traffic surveillance service. Aireon has contracted to offer its service to ANSPs and other commercial customers worldwide. The FAA recently announced that it plans to use the Aireon system in a number of areas beginning in 2020. Aireon has also contracted to pay us a fee to host their payloads on Iridium NEXT and pays us data service fees for the delivery of the air traffic surveillance data from those payloads over the Iridium NEXT system. We will also continue to hold a meaningful equity stake in Aireon.

Distribution Channels

We sell our products and services to customers through a wholesale distribution network of approximately130 service providers, approximately230 VARs and approximately90 VAMs. These distributors sell our products and services to end users, either directly or indirectly through service providers, VARs or dealers. Of these distributors,34 sell primarily to U.S. and international government customers. Our distributors often integrate our products and services with other complementary hardware and software and have developed individual solutions targeting specific lines of business. We also sell airtime services directly to the U.S. government, including the DoD, for resale to other government agencies. The U.S. government and international government agencies may purchase additional services as well as our products and related applications through our network of distributors.

We provide our distributors with support services, including assistance with coordinating end user sales and marketing, strategic planning and training, and second-tier customer support, as well as helping them respond to new opportunities for our products and services. We have representatives covering three regions around the world to better manage our distributor relationships: the Americas, which includes North, South and Central America; Asia Pacific, which includes Australia and Asia;

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and Europe, the Middle East, Africa and Russia. We have also established a global service program to provide portside service for our maritime customers at major ports worldwide. In addition, we maintain various online management tools that allow us to communicate efficiently with our distributors, and allow them to manage their customers’ Iridium devices from anywhere in the world. By relying on our distributors to manage end user sales, we believe that we reduce some of the risks and costs related to our business, such as consumer relationship risks and sales and marketing costs, while providing a broad and expanding distribution network for our products and services with access to diverse and geographically dispersed niche markets. We are also able to benefit from the specialized expertise of our distributors, who continue to develop innovative and improved solutions and applications integrating our product and service offerings, providing us with an attractive platform to support our growth.

Commercial Markets

We view our commercial business as our primary source of long-term growth. Service providers and VARs serve as our main distribution channel by purchasing our products and services and marketing them directly to their customers or indirectly through independent dealers. They are each responsible for customer billing, end user customer care, managing credit risk and maintaining all customer account information. If our service providers or VARs provide our services through dealers, these dealers will often provide such services directly to the end user. Service providers typically purchase our most basic products and services, such as mobile voice services and related satellite handsets, and offer additional services such as voice mail. Unlike service providers, our VARs typically focus more on data applications and provide a broader array of value-added services specifically targeted to the niche markets they serve, such as IoT, maritime, aviation and government markets, where high-use customers with specialized needs are concentrated. These VARs integrate our handsets, transceivers, high-speed data devices and Short Burst Data^®, or SBD^®, modems with other hardware and software to create packaged solutions for end users. Examples of these applications include cockpit voice and data solutions for use by the aviation sector and voice, data and tracking applications for industrial customers, such as Caterpillar Inc., the DoD and other U.S. and foreign government agencies. Our service providers include satellite service providers such as Marlink AS, Applied Satellite Technology Limited and Network Innovations, as well as some of the largest telecommunications companies in the world, including Telstra Corporation Limited, KDDI Corporation and Singapore Telecommunications Limited. Our VARs include ARINC Incorporated, Blue Sky Network, LLC, Caterpillar Inc., Garmin International, Inc., General Dynamics Satellite Communication Services, Inc., Gogo Business Aviation LLC, Komatsu Ltd, Kore Telematics Inc., MetOcean Telematics Limited, Mix Telematics International (Pty) Ltd., NAL Research Corporation, OnixSat Rastreamento de Veículos Ltda. and Zunibal S.A.

We also sell our products to VAMs, who integrate our transceivers into their proprietary hardware. These VAMs produce specialized end-user equipment, including integrated ship, vehicular and aviation communications systems, and global asset tracking devices, which they offer to end users in IoT, maritime, aviation and government markets. As with our service providers and VARs, VAMs sell their products either directly or through other distributors, including some of our service providers and VARs. Our VAMs include Applied Satellite Engineering, Inc., Beam Communications Pty Ltd., Calamp Wireless Networks Corporation, Cobham plc, Garmin Ltd., Gilat Telecom Ltd., Honeywell Global Tracking Limited and Quake Global, Inc.

In addition to VARs and VAMs, we maintain relationships with approximately50 value-added developers, or VADs. We typically provide technical information to these companies on our products and services, which they then use to develop software and hardware that complements our products and services in line with the specifications of our VARs and VAMs. These products include handset docking stations, airline tracking and flight management applications and crew e-mail applications for the maritime industry. We believe that working with VADs allows us to create new platforms for our products and services and increases our market opportunity while reducing our overall research and development, marketing and support expenses. Our VADs include Global Marine Networks, LLC, TE Connectivity Corporation, Maxtena, Inc. and Two10degrees Limited.

We maintain a pricing model for our commercial products and services with a wholesale rate structure. Under our distribution agreements, we charge our distributors wholesale rates for commercial products and services, subject to discount and promotional arrangements and geographic pricing. We also charge fixed monthly access fees per subscriber for some of our services. Our distributors are in turn responsible for setting their own pricing to their customers. Our agreements with distributors typically have terms of one year and are automatically renewable for additional one-year terms, subject to termination rights. We believe we benefit from the simplicity of this business model, which reduces back-office complexities and costs and allows distributors to remain focused on revenue generation, while also providing incentives for distributors to focus on selling our commercial product and service portfolio and developing additional applications.

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Government Markets

We provide mission-critical mobile satellite products and services to all military branches of the DoD as well as other U.S. government departments and agencies. These users require voice and two-way data capability with global coverage, low latency, mobility and security and often operate in areas where no other terrestrial or wireless means of communications are available. We believe we are well-positioned to satisfy demand from these users. Our 9575A satellite handset is the only commercial, mobile handheld satellite phone that is capable of Type I encryption accredited by the U.S. National Security Agency for Top Secret voice communications. In addition, the DoD continues to make significant investments in a dedicated gateway that provides operational security and allows users of encrypted DoD handsets to communicate securely with other U.S. government communications equipment. These investments include upgrading the gateway to take advantage of the enhanced capabilities of Iridium NEXT, including Iridium Certus and other enhanced services. This DoD gateway is only compatible with our satellite network.

We provide airtime and airtime support to U.S. government and other authorized customers pursuant to our five-year EMSS contract, which was extended by the government to April 2019. As of December 2018, this contract, previously managed by the Defense Information Systems Agency, or DISA, is now managed by Air Force Space Command as part of the government's consolidation and reorganization of the way it procures commercial satellite services. Under the terms of this agreement, authorized customers utilize our airtime services through the DoD’s dedicated gateway. These services include unlimited global secure and unsecure voice, low and high-speed data, paging, broadcast, and DTCS services for an unlimited number of DoD and other federal subscribers. Other services may be purchased at an additional cost. The fixed-price rate for the contract is currently$88 million per year, including during the extended contract period. While we sell airtime directly to the U.S. government for resale to end users, our hardware products are sold to U.S. government customers through our network of distributors, which typically integrate them with other products and technologies. Pursuant to federal acquisition regulations, the U.S. government may terminate the EMSS contract, in whole or in part, at any time. We expect to enter into a new contract with the U.S. government to provide satellite airtime services prior to the expiry of the current agreement.

We also provide maintenance services for the DoD gateway pursuant to our Gateway Maintenance and Support Services, or GMSS, contract managed by Air Force Space Command. This agreement, effective September 2013, provided for a one-year base term and four additional one-year options, all of which were exercised, for a total value of the contract to us of approximately$38 million. The U.S. government notified us of its intent to extend this agreement through March 2019, and we expect to enter into a new contract with the U.S. government to provide maintenance and support services for the DoD gateway prior to the expiry of the current agreement. Pursuant to federal acquisition regulations, the U.S. government may terminate the GMSS contract, in whole or in part, at any time.

In October 2012, we were also awarded a five-year indefinite-delivery/indefinite-quantity contract from DISA (now Air Force Space Command) to upgrade the DoD gateway and ensure its compatibility with Iridium NEXT. This contract had a one-year base period and four one-year options, all of which were exercised, and had a value of$47 million to us over the five-year period. Currently, our work for the DoD is performed under a continuing task order.

U.S. government services accounted for approximately20% of our total revenue for the year ended December 31, 2018. Our reported U.S. government revenue includes airtime revenue derived from the EMSS contract and services provided through the GMSS contract and other engineering and support contracts with the U.S. government. This revenue does not include airtime services purchased by U.S. or non-U.S. government agencies that are provided through our commercial gateway, which we report as commercial service revenue, or equipment purchased by government customers from third-party distributors. We are unable to determine the specific amount of U.S. government revenue derived from these commercial sources.

Lines of Business

The specialized needs of our global customers span many markets. Our system is able to offer our customers cost-effective communications solutions with true global coverage in areas unserved or underserved by existing telecommunications infrastructure. Our mission-critical communications solutions have become an integral part of the communications and business infrastructure of many of our end users. In many cases, our service is the only connectivity for these critical applications or is used to complement terrestrial communications solutions.

Our current principal vertical lines of business include land mobile, maritime, aviation, IoT, hosted payloads and other data services and U.S. government. Land mobile, maritime and aviation are the principal contributors to the revenue we report as commercial voice and data. We report commercial voice and data service, IoT data service, hosted payload and other data service, and government service revenue separately. We expect Iridium Certus services to increase our opportunities in most of our lines of business by providing end users an additional competitive broadband communication solution. As we grow our

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Iridium Certus service revenue, we expect to begin separately reporting commercial Iridium Certus revenue with Iridium OpenPort service revenue as a broadband revenue line item. Currently Iridium Certus revenue and Iridium OpenPort service revenue are included in commercial voice and data revenue.

Commercial Voice and Data

Land Mobile

We are the leading provider of mobile satellite communications services to the land mobile sector, providing handset services to areas not served or inconsistently served by existing terrestrial communications networks. In a 2018 report, Northern Sky Research estimated that there were approximately790,000 satellite units in service in 2017. Mining, forestry, construction, oil and gas, utilities, heavy industry and transport companies as well as the military, public safety and disaster relief agencies constitute the largest portion of our land mobile end users. Sales of Iridium GO! and Iridium PTT services also contribute to the land mobile sector. We believe that demand for mobile communications devices operating outside the coverage of terrestrial networks, combined with our small, lightweight, durable handsets with true global coverage, will allow us to capitalize on growth opportunities among these users.

In addition, we expect Iridium Certus land mobile units to be attractive in this market, as the combination of price, speeds, equipment, service costs and durability/ruggedness of equipment are expected to address a distinct market need.

Our land mobile end users utilize our satellite communications services for:

• Voice and data: Multinational corporations in various sectors use our services for business telephony, e-mail and data transfer services, location-based services, broadband and to provide telephony services for employees in areas inadequately served by terrestrial networks. Oil and gas and mining companies, for example, provide their personnel with our equipment solutions while surveying new drilling and mining opportunities and while conducting routine operations in remote areas that are not served by terrestrial wireless communications networks. In addition, a number of recreational, scientific and other outdoor users rely on our mobile handheld satellite phones and services for use when beyond terrestrial wireless coverage. In addition, Iridium PTT offers military, first responder, oil and gas, civil government and other users the ability to hold group calls using the Iridium Extreme^® PTT handset. Our VAMs and VARs can also develop their own land mobile, fixed, aviation or maritime Iridium PTT devices using the Iridium 9523 PTT core transceiver. Our new Iridium Certus offering in this area, the Thales MissionLINK terminal, allows rapid deployment and on-the-move communications, location tracking and telemetry.

• Mobile and remote office connectivity: A variety of enterprises use our services to make and receive voice calls and to establish data, e-mail, internet and corporate network connections.

• Public safety and disaster relief: Relief agencies, such as FEMA, and other agencies, such as the Department of Homeland Security, use our products and services in their emergency response plans, particularly in the aftermath of natural disasters such as Hurricane Harvey, Hurricane Irma, Hurricane Maria and the 2017 Mexico City area earthquake and in places like Puerto Rico after the 2017 hurricanes. These agencies generate significant demand for both our voice and data products, especially in advance of the hurricane season in North America.

• Public telephone infrastructure: Telecommunications service providers use our services to satisfy regulatory mandates and government expectations regarding the availability of communications services for rural populations currently not served by terrestrial infrastructure. Telstra Corporation, for example, uses our services to provide communications services in some of Australia’s most remote locations.

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Maritime

We serve the commercial maritime market with a variety of products including broadband terminals, embedded devices and handsets. This market space includes merchant shipping, fishing, research vessels and specialized watercraft. The majority of our revenue from the maritime market has been derived from shipboard data terminals including the Iridium Pilot^®, which uses the Iridium OpenPort^® service; however we expect that Iridium Certus services will account for an increasing portion of our revenue from this market in the future. While some Iridium Pilot equipment serves the terrestrial market, the vast majority of Iridium OpenPort service revenue comes from the commercial maritime market. Our products and services targeting the maritime market typically have high average revenue per subscriber. Once one of our maritime systems is installed on a vessel, it often generates a multi-year recurring revenue stream from the customer. As a consequence, from time to time we may offer promotions or rebates to accelerate new customer acquisitions and solidify this expected long-term revenue stream.

We believe demand for higher-speed, low-cost data services will allow us to capitalize on opportunities in this market. We believe Iridium Pilot, which uses our Iridium OpenPort service to offer uncompressed data speeds of up to 134 kilobits per second, or Kbps, and three independent voice lines, presents a competitive communication solution at this speed to users in the maritime market. Our maritime Iridium Certus service provides initial uncompressed data speeds of up to 352 Kbps, which we expect to later increase to 704 Kbps with a firmware update. We expect these higher speeds to increase the addressable market for our maritime services.

Maritime end users utilize our satellite communications services for the following:

• Business critical data applications: Ship operators use our services to exchange e-mail and data files and to receive other information such as meteorological reports, emergency bulletins, cargo and voyage data and electronic chart updates. We believe Iridium Certus and Iridium OpenPort provide attractively priced options for shipping operators and fishing fleets seeking increased functionality, as well as for yachts, work boats and other vessels for which traditional marine satellite systems have typically been costly and underperforming.

• Voice services: Maritime global voice services are used for both vessel operations and communications for crew welfare. Merchant shipping companies use prepaid phone cards for crew use at preferential around-the-clock flat rates.

• Vessel management and asset tracking: Shipping operators, such as China Ocean Shipping Company, or COSCO, and Zodiac Shipping Ltd., use our services to manage operations on ships and to transmit data, such as course, speed and fuel stock. Our services are commonly integrated with GPS to provide a real-time position reporting capability. Many fishing vessels are required by law to carry terminals using approved mobile satellite services for tracking purposes as well as to monitor catches and to ensure compliance with geographic fishing restrictions. European Union regulations, for example, require EU-registered fishing vessels of over 15 meters to carry terminals for the purpose of positional reporting of those vessels. Furthermore, new security regulations in some jurisdictions are expected to require tracking of merchant vessels in territorial waters, which would provide an additional growth opportunity for us.

• Safety and Security applications: Ships in distress, including as a result of potential piracy, hijack or terrorist activity, rely on mobile satellite voice and data services. The Ship Security and Alert Systems, or SSAS, and Long Range Identification Tracking, or LRIT, regulations were adopted by the International Maritime Organization, or IMO, to enhance maritime security in response to the threat from terrorism and piracy. Most deep-sea passenger and cargo ships must be fitted with a device that can send an alert message containing the ship’s ID and position whenever the ship is under threat or has been compromised. In addition, the IMO and a NATO advisory group have recommended the installation of a safe room equipped with a standalone secure communication link the crew can use from inside the room to communicate with rescuing forces. Our distribution partners have developed several product solutions using our network to meet these requirements for merchant and fishing vessels.

The GMDSS is a maritime service built to alert a maritime rescue coordination center of each vessel’s situation and position, information that can then be used to coordinate search and rescue efforts among ships in the area. GMDSS service is also used to distribute important navigational and meteorological information to vessels. The IMO requires all vessels flagged by signatories to the International Convention for the Safety of Life at Sea, or SOLAS, over 300 gross tons and certain passenger vessels, irrespective of size, that travel in international waters to carry distress and safety terminals that provide GMDSS services. We have been recognized by the IMO as a provider for the GMDSS. We expect our maritime terminals, which will include GMDSS service capabilities developed by our manufacturing licensees, to be available to vessel operators in 2020, once we have completed the implementation process of the GMDSS service.

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Aviation

We are one of the leading providers of mobile satellite communications services to the aviation sector. Our services are increasingly used in commercial and global government aviation applications, principally by corporate jets, corporate and government helicopter fleets, specialized general aviation fleets, such as medevac companies and fire suppression fleets, and high-end personal aircraft. Our services are also employed by commercial airline operators for flight deck voice and data link services for aircraft operational and safety communications. As a result of authorizations by the FAA and U.S. Federal Communications Commissions, or FCC, for us to provide air traffic datalink communications, commercial operators are installing avionics that use the Iridium network on the flight deck to comply with international air navigation communications requirements to operate in oceanic and remote airspace. Voice and data avionics platforms from our VAMs and VARs have been adopted as standard equipment and as factory options for a range of airframes in business aviation and air transport, such as Gulfstream Aerospace Corporation, Bombardier Inc., Cessna Aircraft Company, Boeing and Airbus. Avionics platforms that utilize our network are also retrofitted on thousands of corporate and commercial aircraft already in operation.

Aviation end users utilize our satellite communications services for:

• Air traffic control communications and safety applications: The International Civil Aviation Organization, or ICAO, has approved standards and recommended practices allowing us to provide AMSRS to commercial aircraft on long-haul routes. This allows member states to evaluate and approve our services for safety communications on flights in oceanic and remote airspace. The FAA has approved Iridium for use in the Future Air Navigation Services, or FANS, including Automatic Dependent Surveillance - Contract, or ADS-C, datalink communications and Controller-Pilot Data Link Communications, or CPDLC, with air traffic control. Aircraft crew and air traffic controllers will be able to use our services for data and voice communications between the aircraft flight deck and ground-based air traffic control facilities. We are the only satellite provider capable of offering these critical flight safety applications around the entire globe, including the polar regions. We believe this particular sector of the market provides us with significant growth opportunities, as our services and applications can serve as a cost-effective alternative to systems currently in operation.

• Aviation operational communications: Aircraft crew and ground operations use our services for air-to-ground telephony and data communications. This includes the automatic reporting of an aircraft’s position and mission-critical condition data to the ground and controller-pilot data link communication for clearance and information services. We provide critical communications applications for numerous airlines and air transport customers including Hawaiian Airlines, United Airlines, UPS, Cathay Pacific Airways and El Al Airlines. These operators rely on our services because other forms of communication may be unaffordable or unreliable in areas such as the polar regions. Collins Aerospace (ARINC) and SITA, the two leading providers of voice and data link communications services and applications to the commercial airline industry, integrate our products and services into their offerings.

• Aviation passenger communications: Corporate and private fleet aircraft passengers use our services for air-to-ground telephony and data communications. Operators are currently using our services to enable passengers to e-mail using their own Wi-Fi-enabled mobile devices, including smartphones, without causing interference with aircraft operation. We believe our distributors’ small, lightweight, cost-effective solutions offer an attractive option for aircraft operators, particularly small fleet operators. We expect that users in the corporate aviation market, and original equipment manufacturers, or OEMs, for business jets, will increase adoption of our services for in-flight, passenger data communications using Iridium. We believe this presents a significant opportunity to increase market penetration and revenues in this market.

• Rotary and general aviation applications: The Iridium network is uniquely suited to these sectors, as we have small antenna designs that work under rotor blades and enable installation on smaller general aviation platforms. We are also a major supplier for rotary aviation applications to end users in a number of markets, including medevac, law enforcement, oil and gas, and corporate work fleets. Companies such as Air Logistics, EagleMed and Air Evac Lifeteam rely on applications from our distributors for traditional voice communications, fleet tracking and management, and real-time flight diagnostics. VARs and VAMs such as Flightcell International Ltd., Garmin International, Inc., Honeywell International, Inc., SkyTrac and Spider Tracks Limited incorporate Iridium products and services into their applications for this market.

• Unmanned Aerial Vehicles (UAVs): Iridium’s small antennas and system designs support a wide range of UAV platforms. In addition, Iridium’s global footprint enables reliable beyond-line-of-sight communications for these UAV platforms regardless of their operational range. Iridium operates as the communication link for remote-piloted aircraft

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for uses such as package delivery, medical supply, law enforcement, corporate surveying and even military applications.

We believe the benefits of Iridium Certus will enhance our ability to address aviation market needs across these sectors.

Commercial IoT Data

We are one of the leading providers of satellite-based IoT services. We believe this market continues to experience increasing penetration and presents opportunities for future growth. As with land mobile, our largest IoT users include mining, construction, oil and gas, utilities, heavy industry, maritime, forestry and transport companies, as well as the military, public safety and disaster relief agencies. We believe increasing demand for automated data collection processes from mobile and remote assets operating outside the coverage of terrestrial wireline and wireless networks, as well as the continued need to integrate the operation of such assets into enterprise management and information technology systems, will likewise increase demand for our IoT applications. For example, our IoT devices have been adopted as standard equipment and as factory options by heavy equipment manufacturers such as Caterpillar Inc., Hitachi, Komatsu and Doosan to provide telematics solutions for end users.

Our IoT services are used for:

• Heavy equipment monitoring: Large, global heavy equipment original equipment manufacturers, such as Caterpillar Inc., Komatsu Limited, Hitachi Construction Machinery Co. Ltd., CNH Global N.V. and AGCO Corporation, use our global IoT services to monitor their off-road heavy equipment in markets such as construction, mining, agriculture and forestry.

• Fleet management:  Our global coverage permits our products and services to be used to monitor the location of vehicle fleets, hours of service and engine telemetry data, as well as to conduct two-way communications with drivers around the world. Fleet management companies, such as Trimble Transportation & Logistics, Mix Telematics and Zatix, use our service to provide distance drivers with reliable communication to their dispatchers and their destinations to coordinate changing business needs, and our satellite network provides continuous communications coverage while they are in transit. We expect that the need for more efficient, cost-effective and safer fleet operations, as well as the imposition of regulatory mandates related to driver safety, such as drive-time monitoring, will increase demand for our services in this area.

• Fixed-asset monitoring:  Multinational corporations, such as oil-field service companies like Schlumberger Limited and ConocoPhillips Company, use our services to run applications that allow remote monitoring and operation of equipment and facilities around the globe, such as oil pipelines and offshore drilling platforms.

• Asset tracking:  Leveraging IoT applications developed by several of our distributors, companies use our services and related devices to track assets, including personnel, for logistics, theft-prevention and safety purposes. Companies and organizations that have fleets of vehicles use IoT solutions from Iridium distributors to improve the efficiency of their operations. For example, customers use Trimble Transportation’s solution to provide global communication to transportation assets, and the Department of Homeland Security Office of Enforcement and Removal uses Fleet Management Solutions’ IoT solution to transmit position, direction, speed and other data for management of its vehicle fleet.

• Resource management:  Our global coverage and data throughput capabilities support natural resource management applications, such as fisheries management systems. CLS, MetOcean Telematics and Rock Seven, three of our VARs, have developed applications for the fishing industry that enable regulatory compliance of fishing practices in a number of countries around the world.

• Scientific data monitoring:  The global coverage of our network supports many scientific data collection applications such as the Argo float program of the National Oceanographic and Atmospheric Administration, or NOAA, the Global Ocean Observation project Challenger, operated by Rutgers University, and the anti-poaching programs of organizations such as Smithsonian National Zoo & Conservation Institute, Zoological Society of London, and Veterans Empowered to Protect African Wildlife, or VETPAW. These programs rely on our IoT services to collect scientific data from buoys and ocean gliders located throughout the world’s oceans and from wildlife habitats for monitoring and analysis. We believe the increased need for monitoring climate and environmental data associated with global climate change and human impact on the planet will increase demand for these services.

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• Personal Tracking Devices and Location-Based Services:  Several of our VAMs and VARs, such as Garmin, NAL Research and Track24, market small, portable personal tracking devices that provide personal tracking and data communications services to consumers and commercial end users. In addition, Iridium GO! and the Iridium Extreme handsets offer personal tracking and location-based services. These devices use IoT data services to send location information and other data to web-based portals for tracking of and messaging with users.

Hosted Payload and Other Data Services

Our Iridium NEXT satellites also host customer payloads. We generate revenue from these customers both from the hosted payload capacity and from data service fees. Because these revenues are based on a contractual commitment for the life of the Iridium NEXT constellation, we recognize revenue from these customers over the expected life of the system.

In addition to access and usage fees in the vertical lines of business described above, we generate revenue from several ancillary services related to our core service offerings. In conjunction with Satelles, Inc., we offer Satellite Time and Location services, which helps augment GPS and provides reliable location, timing and positioning data. We provide inbound connections from the public switched telephone network, or PSTN, short message services, or SMS, subscriber identity module, or SIM, activation, customer reactivation, and other peripheral services. We also provide research and development services to assist customers in developing new technologies compatible with our system, which we may leverage for use in service and product offerings in the future. We charge our distributors fees for these services.

U.S. Government

We are one of the leading providers of mobile satellite communications services to the U.S. government, principally the DoD. We provide mobile satellite products and services to all branches of the U.S. armed forces. Our voice products are used for a variety of primary and backup communications solutions, including tactical operations, logistical, administrative, morale and welfare, and emergency communications. In addition, our products and related applications are installed on ground vehicles, ships, rotary- and fixed-wing aircraft, embedded in unattended sensors and used for command and control and situational awareness purposes. Global security concerns are among the factors driving demand for our products and services in this sector. See “—U.S. Government Services” for more information.

Seasonality

Our business is subject to seasonal usage changes for commercial customers, and we expect it to be affected by similar seasonality going forward. March through October are typically the peak months for commercial voice traffic and related subscriber equipment sales, given the predominance of population and outdoor activity in the northern hemisphere. U.S. government usage and commercial IoT usage have been less subject to seasonal changes.

Services and Products

At December 31, 2018, we had approximately1,121,000 billable subscribers worldwide. Our principal services are mobile satellite services, including mobile voice and data services, high-speed data services, IoT services, hosted payload and other data services and engineering services. Sales of our commercial services collectively accounted for approximately61% of our total revenue for the year ended December 31, 2018. We also sell related voice and data equipment to our customers, which accounted for approximately19% of our total revenue for the year ended December 31, 2018. In addition, we offer services to U.S. government customers, including the DoD. U.S. government services, including engineering services, accounted for approximately20% of our total revenue for the year ended December 31, 2018.

Commercial Services

Postpaid Mobile Voice and Data Satellite Communications Services

We sell our mobile voice and data services to service providers and VARs who in turn offer such services to end users, either directly or indirectly through dealers, using various packaged solutions such as seasonal or annual plans with differing price levels that vary depending upon expected usage. In exchange for these services, we typically charge service providers and VARs a monthly access fee per subscriber, as well as usage fees for airtime resources consumed by their respective subscribers.

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Prepaid Mobile Voice Satellite Communications Services

We also offer mobile voice services to service providers and VARs through prepaid plans. Service providers and VARs pay us in advance for defined blocks of airtime minutes with expiration periods in various configurations, ranging from 30 days to two years. These services are then generally sold to subscribers in the form of prepaid scratch cards and e-vouchers that enable subscribers to use our services on a per-minute basis. Unused minutes generally are forfeited on the applicable expiration date. We believe service providers and VARs are drawn to these services because they enable greater cost control by eliminating the need for monthly billings and reducing collection costs, and can be sold in countries where credit may not be readily available for end users. Our distributors often offer our prepaid voice services through fixed devices to subscribers in rural villages, at remote industrial, commercial and residential sites, and on ships at sea, among other places. Fixed voice satellite communications services are in many cases an attractive alternative to handheld mobile satellite communications services in situations where multiple users will access the service within a defined geographic area and terrestrial wireline or wireless service is not available. Fixed phones, for example, can be configured as pay phones that accept prepaid scratch cards and can be installed at a central location, for example in a rural village or on a maritime vessel.

Iridium PTT Service

Building on the foundation of DTCS technology, which provides regional tactical radio service to DoD users, our Iridium PTT service enables regional or global PTT calls among users on the same talkgroup in up to 10 geographically disparate locations around the world, providing a fast and robust communication experience. Iridium PTT can be used via the Iridium Extreme PTT satellite phone or the Iridium 9523 PTT core transceiver, which gives our VAMs the ability to build Iridium PTT into existing land mobile, maritime and aviation communications platforms. We and our partners are also developing interoperability solutions for existing terrestrial land mobile radio systems, which will further extend the utility of the service. For example, Icom Inc. of Japan is developing the first purpose-built satellite PTT radio handheld unit for use on the Iridium network.

Broadband Data Services

Our new broadband data offering, Iridium Certus, was launched in January 2019. Iridium Certus is a new suite of products and services enabled by the Iridium NEXT satellite constellation. Iridium Certus is a multi-service platform capable of offering higher quality voice, enterprise-grade broadband functionality, SBD, streaming PTT and safety services on a global basis. Initial service offering speeds are 352 Kbps and are expected to be upgradable to 704 Kbps through a firmware upgrade. Ultimately, Iridium Certus is designed to support a variety of cost points, antenna types and data speeds ranging from 22 Kbps to 1.4 Mbps. We have licensed the Iridium Certus technology to an initial group of VAMs who are developing products for the maritime, aviation, land mobile and government markets, as well as distribution partners for the Iridium Certus service in each of these vertical markets. We believe Iridium Certus provides a competitive, cost-effective and reliable range of narrowband and broadband services to the market, in standalone applications or as a complement to other wireless technologies for critical applications and safety services.

We also offer Iridium OpenPort, which provides maritime, aviation and terrestrial users speeds of up to 134 Kbps and three independent voice lines. For our Iridium OpenPort service, we typically charge service providers usage fees for airtime consumed by the respective subscribers for voice and data communications. In conjunction with our distributors, we also offer additional services that permit service providers and VARs to offer complete integrated solutions for prepaid calling, e-mail and IP-based data communications. For example, one of our distribution partners, KVH Industries, Inc., has been integrating Iridium Pilot with its miniature Very Small Aperture Terminal, or mini-VSAT^SM, broadband service to provide backup connectivity when the mini-VSAT terminal is out of its coverage area or out of service.

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Internet of Things Services

Our IoT services are designed to address the market need for a small and cost-effective solution for sending and receiving data, such as location, from fixed and mobile assets in remote locations to a central monitoring station. This service operates through a two-way SBD transmission or circuit-switched data, between our network and a transceiver, which may be located, for example, on a container in transit or a buoy monitoring oceanographic conditions. The small size of our devices and their low-cost, omnidirectional antennas make them attractive for use in applications such as tracking asset shipments and monitoring unattended remote assets, including oil and gas assets, as well as vehicle tracking and mobile security. We sell our IoT services to our distributors, who incorporate them and in turn provide a solution package to commercial and government customers. Increasingly, our IoT transceivers are being built into products for consumer markets, such as personal location devices that provide two-way messaging. As with our mobile voice and data offerings, we typically charge service providers and VARs a monthly access fee per subscriber as well as usage fees for data used by their respective subscribers.

U.S. Government Services

We provide U.S. government customers bulk access to our services, including voice, netted voice, data, messaging and paging services, as well as maintenance services for the DoD’s dedicated gateway. We provide airtime to U.S. government subscribers through DoD’s gateway, under the EMSS contract, which is a fixed-price contract covering voice, low-speed data, paging, broadcast and DTCS services. Additional services, such as broadband capabilities utilizing Iridium Certus technology, would be provided at an additional fee. To comply with U.S. government requirements, we ensure handsets sold for use by the U.S. government are manufactured in the United States. U.S. government customers procure our voice and data devices through specific, approved distributors from our network of service providers and VARs. Our VARs and VAMs typically integrate our products with other products, which they then offer to U.S. government customers as customized products, typically provisioned by DISA. Our voice and data solutions for the U.S. government include:

• personnel tracking devices;

• asset tracking devices for equipment, vehicles and aircraft;

• beyond-line-of-sight aircraft communications applications;

• submarine communications applications;

• specialized communications solutions for high-value individuals; and

• specialized, secure, mobile communications and data devices for the military and other government agencies, such as secure satellite handsets with U.S. National Security Agency Type I encryption capability.

With funding support from the DoD, we continue to invest in research and development to develop new products and applications for use by all branches of the U.S. armed forces. For example, in conjunction with DISA, we and select distribution partners offer DTCS, which provides critical, secure, PTT, netted communications using lightweight, handheld tactical radios, or add-ons to existing government tactical radios. In addition, we offer a secure satellite phone based on the Iridium Extreme, which we also developed with funding support from the DoD, which was accredited by the National Security Agency, or NSA, to provide Type-1 encryption, enabling communications up to Top Secret from anywhere in the world.

Our Products

We offer a broad array of voice and data products for customers that work worldwide. In most cases, our devices or an antenna must be located outside and within view of a satellite to be able to access our network.

Satellite Handsets

Our principal handset offerings are the Iridium 9555 and Iridium Extreme satellite handsets, which are similar in functionality to ordinary cellular phones but with the solid, durable feel that satellite phone users demand. We believe our reputation for industrial-strength products is critical for customers, many of whom are located in the most inhospitable spots on the planet and require rugged and reliable communications equipment.

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Iridium 9555. The Iridium 9555 provides voice, SMS and data connectivity. This model features a large, bright screen, SMS and e-mail capabilities, an integrated antenna and a speakerphone. The Iridium 9555 weighs 9.4 ounces and offers up to 3.1 hours of talk time. The Iridium 9555 has an industrial feel, with a rugged housing to protect its sophisticated satellite transceiver.

Iridium Extreme. The Iridium Extreme adds to the Iridium 9555’s capabilities by providing a rugged exterior that meets DoD Military Standard 810F for durability, a dedicated, two-way emergency SOS button, and fully integrated GPS and location-based services. These extra features are provided in a handset that is even smaller than the Iridium 9555, weighing 8.7 ounces and offering up to four hours of talk time. An emergency response service provided by GEOS Travel Safety Group, or GEOS, is included with the purchase of the phone and airtime usage. The two-way emergency SOS button initiates a phone call and an emergency message via SMS to GEOS, which then coordinates with local emergency responders.

Iridium Extreme PTT.We also offer the Iridium Extreme PTT, which enhances the Iridium Extreme with an intelligently designed push-to-talk mode, expanded speakerphone, reinforced PTT button, and extended capacity battery. The user interface provides access to multiple communication services, including voice calling, SMS and SOS, allowing users to connect to a talkgroup located in up to 10 geographic regions worldwide.  The Iridium Extreme PTT weighs 9.5 ounces and offers up to 6.5 hours of talk time in phone mode and five hours of talk time in PTT mode.

We expect these devices to maintain our competitive position as premium offerings in the market due to their capabilities, mobility, reliability and global coverage. In addition to these devices, we offer variants of the Iridium 9555 handset and the Iridium Extreme handset that are qualified for sale to U.S. government customers.

Iridium GO!

We also offer Iridium GO!, a small, rugged, personal connectivity device that connects to the Iridium network to create a Wi-Fi hotspot, enabling the use of smartphones and tablets for voice calls, text messages and emails, posts to social networking sites, and limited use of optimized mobile websites. Iridium GO! also has an emergency SOS button and GPS and location-based services. Smartphone or tablet access is provided through special applications downloaded for free from the Apple App Store or through Google Play for Android smartphones or tablets. A software development kit is available to enable the creation of additional applications or integrate Iridium GO! connectivity into existing applications.

Voice and Data Modems

We also offer a combined voice transceiver and data modem, which our distributors integrate into a variety of communications solutions that are deployed in different applications around the world. Our principal offering in this space is the Iridium Core 9523 L-Band transceiver, which utilizes the transceiver core of our Iridium Extreme satellite handset. The Iridium Core 9523 provides a small voice and data module that can be integrated with other components to create a modem tailored for typical VAM applications as well as specific applications, such as a dual-mode terrestrial radio and satellite phone or IoT applications that require more efficient data throughput through circuit-switched data transmission. The Iridium 9523 PTT adds PTT capability, allowing development partners to design and build land mobile, fixed, aviation and maritime devices with Iridium PTT. We also offer the 9522B L-Band transceiver, which utilizes the same transceiver core that is used in our Iridium 9555 satellite handset to provide voice and circuit-switched data services. Our principal customers for our L-Band transceivers are VAMs and VARs, who integrate them into specialized devices that access our network.

Broadband Data Devices

We have selected several VAMs to manufacture terminals for use with our Iridium Certus broadband service. Iridium Certus terminals are specifically designed for the maritime, aviation, land mobile or government markets and ultimately will offer a variety of significantly enhanced data speeds and antenna types. Iridium Certus terminals provide enterprise-grade broadband functionality alongside high quality voice capabilities that can be used on a global basis. Initial terminal offering speeds are 352 Kbps and will later be upgradable to 704 Kbps through a firmware upgrade. Ultimately, Iridium Certus terminals are designed to offer a variety of cost points, antenna types and data speeds ranging from 22 Kbps to 1.4 Mbps. We believe Iridium Certus provides a competitive, cost-effective and reliable range of narrowband and broadband services to the market, in standalone applications or as a complement to other wireless technologies.

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Iridium Certus is ideal for maritime operational and safety services. These terminals deliver the satellite communications technology that the industry demands, combining all the benefits of L-Band with broadband and truly global coverage. Iridium Certus terminals offer superior connectivity for maritime customers whether used as a standalone service or as a complement to VSAT services. Our principal end users for Iridium Certus in the maritime market are merchant shipping, commercial fishing, large leisure vessels, and work boats. Our initial terminals in this market are the Cobham Sailor 4300 and Thales VesseLINK.

In aviation, Iridium Certus will deliver critical safety services and in-flight communications. Our principal end users for Iridium Certus in the aviation market include commercial, corporate and government users, general aviation, rotorcraft and unmanned aircraft. Our initial terminal in this market will be the FlytLINK by Thales, which is targeted for commercial availability in2019.

In the land mobile market, we expect enterprises, governments, and individuals that want to extend their use of mobile networks into remote areas without having to deploy ground-based infrastructure or expensive terminals will utilize Iridium Certus. Iridium Certus devices may be integrated with internet, cellular, land mobile radio, and location-based applications to keep users connected, offering global push-to-talk, situational awareness, email, messaging and voice-over-IP. We believe our principal end users for Iridium Certus in the land mobile market will be military users, first responders, non-governmental organizations, oil and gas users, remote fleets and media users. Our initial terminal in this market is Thales MissionLINK, which is now commercially available.

In the government market, Iridium Certus terminals will provide beyond-line-of-sight communications critical to mission

success. The initial terminal in this market is the Thales MissionLINK.

Our legacy terminal, the Iridium Pilot, provides up to three independent voice lines and an internet connection for data communications of up to 134 Kbps, using our Iridium OpenPort service. All voice and data capabilities can be used simultaneously. Our principal customers for Iridium Pilot are service providers who integrate the device with their own hardware and software products to provide a suite of customer-focused voice and IP-based data packages for ship operation, crew calling and e-mail. We believe our Iridium Pilot terminal, with its flexible service options, provides an excellent low-cost option to the maritime market, including market sectors such as luxury yachts, tug boats, and other fishing and cruising vessels. Iridium Pilot also offers a low-cost solution as a complement to maritime Ku- and Ka- Band VSAT systems providing broadband and data services for ships, where Iridium Pilot can fill in coverage gaps and operate during significant rain fade events that impair K-band service, provide services where the VSAT terminal is not licensed to operate, and provide an alternate channel during VSAT maintenance and configuration. We also offer Iridium Pilot Land Station, which allows remote individuals and businesses from off-the-grid terrestrial locations to obtain reliable internet connections and voice calling no matter where they are located.

Internet of Things Data Devices

Our principal IoT devices are the Iridium 9602 and 9603 full-duplex SBD transceivers. The Iridium 9602 is a small data device with two-way transmission, capable of sending packet data to and from any point in the world with low latency. The principal customers for our Iridium 9602 data modems are VARs and VAMs, who embed the device into their tracking, sensor, and data applications and systems, such as asset tracking systems. Our partners often combine the Iridium 9602 with a GPS receiver to provide location information to customer applications. We also offer the Iridium 9603, an even smaller transceiver that is functionally identical to the Iridium 9602. In addition, a number of VARs and VAMs include a cellular modem as part of their Iridium applications to provide low-cost cellular data transmission when available. These types of multimode applications are adopted by end users who require the ability to regularly transfer data but operate in areas with inconsistent cellular coverage. We provide gap-filler coverage for these applications, allowing users to operate anywhere on the globe.

We also offer Iridium Burst^®, our one-to-many global data broadcast service, which enables enterprises to send data to an unlimited number of devices anywhere in the world, even inside buildings, vehicles or aircraft, and Iridium Edge^®, an off-the-shelf, environmentally sealed, rugged device that complements existing cellular solutions to create dual-mode connectivity for the most remote and inaccessible areas of the world. Iridium Edge reduces the cost and complications associated with hardware development, manufacture and certification of satellite-specific terminals, which we expect to enable greater adoption of our IoT services.

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Device Development and Manufacturing

We contract with Cambridge Consulting Ltd. and other suppliers to develop our devices, with Benchmark Electronics Inc., or Benchmark, to manufacture most of our devices in a facility in Thailand, and with Hybrid Design Associates to manufacture a portion of our devices in the U.S. Pursuant to our contract with Benchmark, we may be required to purchase excess materials at cost plus a contractual markup if the materials are not used in production within the periods specified in the agreement. Benchmark generally repurchases the materials from us at the same price we paid, as required for the production of the devices. Our agreement with Benchmark is automatically renewable for additional one-year terms unless terminated by either party.

We selected several VAMs to manufacture terminals for use with our Iridium Certus broadband service. Iridium Certus terminals are specifically designed for the maritime, aviation or land mobile markets, and certain of these VAMs were given certain limited exclusivity in those markets, in exchange for sales commitments.

We generally provide our distributors with a warranty on subscriber equipment for one to five years from the date of activation, depending on the product. We also utilize other suppliers, some of which are the sole source, to manufacture some of the component parts of our devices.

In addition to our principal products, we also offer a selection of accessories for our devices, including extended-life batteries, holsters, earbud headphones, portable auxiliary antennas, antenna adaptors, USB data cables and charging units, among others. We purchase these products from several third-party suppliers either pursuant to contractual agreements or off the shelf at market prices.

Our Spectrum

We hold licenses to use 8.725 MHz of contiguous spectrum in the L-Band, which operates at 1.6 GHz, and allows for two-way communication between our devices and our satellites. In addition, we are authorized to use 200 MHz of K-Band (23 GHz) spectrum for satellite-to-satellite communications, known as inter-satellite links, and 400 MHz of Ka-Band spectrum (19.4 GHz to 19.6 GHz and 29.1 GHz to 29.3 GHz) for two-way communication between our satellites and our ground stations, known as feeder links. We are also authorized to use the 156.0125-162.0375 MHz spectrum for reception of Automatic Identification System transmissions from maritime vessels and the 1087.7-1092.3 MHz spectrum for reception of Automatic Dependent Surveillance-Broadcast transmissions from aircraft. Access to this spectrum enables us to design satellites, network and terrestrial infrastructure enhancements cost effectively because each product and service can be deployed and sold worldwide. Our products and services are offered in over100 countries, and we and our distributors continue to seek authorizations in additional countries.

Our use of spectrum is globally coordinated and recorded by, and subject to the frequency rules and regulations of, the International Telecommunication Union, or ITU. The ITU is the United Nations organization responsible for worldwide co-operation in the telecommunications sector. In order to protect satellite systems from harmful radio frequency interference from other satellite systems, the ITU maintains a Master International Frequency Register of radio frequency assignments. Each ITU administration is required to give notice of, coordinate and record its proposed use of radio frequency assignments with the ITU’s Radiocommunication Bureau. The coordination negotiations are conducted by the national administrations with the assistance of satellite operators. When the coordination process is completed, the ITU formally notifies all proposed users of frequencies and orbital locations in order to protect the recorded assignments from subsequent nonconforming or interfering uses by member states of the ITU. Only member states have full standing within this inter-governmental organization. Filings to the ITU were made on our behalf by the United States.

The ITU also controls the assignment of country codes used for placing telephone calls between different countries. Our network has been assigned the 8816 and 8817 country codes and uses these numbers for calling and communications between terminals.

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Domestic and Foreign Revenue

We supply services and products to customers in a number of foreign countries. We allocate revenue geographically based on where we invoice our distributors, whom we bill for mobile satellite services and related equipment sales, and not according to the location of the end user. These distributors sell services directly or indirectly to end users, who may be located elsewhere. It is not possible for us to determine the geographical distribution of revenue from end users, as we do not contract directly with them. Substantially all of our revenue is invoiced in U.S. dollars. The table below sets forth the percentage of our revenue by country for the last three years. 

	Year Ended December 31,
	2018		2017		2016
United States	53	%	51	%	52	%
Canada	9	%	10	%	10	%
United Kingdom	10	%	10	%	11	%
Other Countries (1)	28	%	29	%	27	%

⁽¹⁾  No single country in this group represented more than10% of our revenue for any of the periods indicated.

For more information about our revenue from sales to foreign and domestic customers, see Note 15 to our consolidated financial statements included in this annual report.

Traffic Originating Outside the United States

A significant portion of our voice and data traffic originates outside the United States. The table below sets forth the percentage of our commercial voice and data traffic originating outside the United States, excluding Iridium OpenPort traffic, for the last three years.

	Year Ended December 31,
	2018		2017		2016
Commercial voice traffic (minutes)	90	%	88	%	88	%
Commercial data traffic (kilobytes)	72	%	75	%	72	%

Our Network

Our Constellation

Our satellite network has an architecture of66 operational LEO satellites in six orbital planes of eleven vehicles each in nearly circular polar orbits, in addition to in-orbit spares and related ground infrastructure, as well as ground spares. Our operational satellites orbit at an altitude of approximately 483 miles (778 kilometers) above the earth and travel at approximately 16,689 mph, resulting in a complete orbit of the earth approximately every 100 minutes. The design of our constellation ensures that generally at least one satellite is visible to subscribers from any point on the earth’s surface, covering all of the world’s population. While our constellation offers true global coverage, most of our devices and antennas must have a direct line of sight to a satellite to transmit or receive a signal, and services on those devices are not available in locations where a satellite signal cannot be transmitted or received, which for some devices includes inside a building.

During 2017, we began de-orbiting our first-generation satellites on an individual basis after they were replaced by Iridium NEXT vehicles. We expect to complete the required de-orbit initiation process for our first-generation satellites during 2019.

Our constellation is unique among commercial constellations in the usage of radio frequency crosslinks between our satellites, which eliminates the need for local ground infrastructure. These crosslinks enable each satellite to communicate with up to four other satellites in space, two in the same orbital plane and two in adjacent planes. Our traffic is routed on a preplanned route between satellites to a predetermined satellite that is in contact with one of the Iridium teleport network, or TPN, locations. The TPN sites then transmit the traffic to and from the gateways which in turn provide the interface to terrestrial-based networks such as the PSTN, a public land mobile network, or PLMN, and the internet. The use of a TPN allows grounding traffic at multiple locations within our ground network infrastructure. This flexibility allows for rapid reconfiguration of grounding traffic from the satellites in the event of a space, antenna or ground routing anomaly and results in greater reliability of our network. The design of our space and ground control system also facilitates the real-time monitoring and management of the

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satellite constellation and facilitates service upgrades via software enhancements. All our ground infrastructure, including gateway and teleport technology and satellite control systems, was upgraded in advance of the completion of Iridium NEXT.

We believe our interlinked satellite infrastructure provides several advantages over low earth orbiting “bent-pipe” satellite networks that rely on multiple terrestrial gateways, such as Globalstar’s and ORBCOMM’s networks. We have the only satellite network with true global coverage, and our constellation is less vulnerable to single points of failure, as traffic can be routed around any one satellite problem to complete the communications path to the ground. In addition, the small number of ground stations increases the security of our constellation, a factor that makes our network particularly attractive to government institutions and large enterprises. The low orbit of our constellation also allows our network to operate with low latency and with smaller antennas due to the proximity of our satellites to the earth.

Our constellation is designed to provide significant coverage overlap for mitigation of service gaps from individual satellite outages, particularly at higher northern and southern latitudes. Each satellite in our constellation was designed with a high degree of on-board subsystem robustness, an on-board fault detection system, and isolation and recovery capabilities for safe and quick risk mitigation. Our ability to reposition our satellites provides us with operating flexibility and enhances our ability to maintain a commercially acceptable level of service. If a satellite should fail or become unusable, in most cases we will be able to reposition one of our in-orbit spare satellites to take over its functions within days, with minimal impact on our services.

Our primary commercial gateway is located in Tempe, Arizona, with a second dedicated commercial gateway located in Russia. A gateway processes and terminates calls and generates and controls user information pertaining to registered users, such as geo-location and call detail records. The DoD owns and operates a dedicated gateway for U.S. government users, which provides an interface between voice and data devices and the Defense Information Systems Network and other terrestrial infrastructure, providing DoD users with secure communications capabilities. Our network has multiple antennas located at the TPN facilities, including the Tempe gateway, that communicate with our satellites and pass calls between the gateway and the satellites as the satellites traverse our antennas, thereby connecting signals from the terminals of end users to our gateways. This system, together with our satellite crosslinks, enables communications that are not dependent on a ground station in the region where the end user is using our services.

We operate our satellite constellation from our satellite network operations center, or SNOC, in Leesburg, Virginia. This facility manages the performance and status of each of our satellites, developing and distributing routing tables for use by the satellites, TPN facilities and gateways, directing traffic routing through the network and controlling the formation of coverage areas by the satellites’ main mission antennas. We also operate TPN facilities in Fairbanks, Alaska and Tempe, Arizona in the United States, and in northern Canada and Norway that perform telemetry, tracking and control functions and route commercial services.

From time to time, individual satellites in our constellation experience operating problems that may result in a satellite outage, but due to the overlapping coverage within our constellation and the dynamic nature of our LEO system, the individual satellite outages typically do not negatively affect our customers’ use of our system for a prolonged period. In addition, most system processing related to our service is performed using software on board each satellite instead of on the ground. We believe this provides us with significant flexibility and contributes to the longevity of the constellation by enabling engineers to develop additional functionality and software-based solutions to occasional faults and anomalies in the system.

We selectively replace parts for our gateway and TPN facilities as necessary and maintain an inventory of spare parts, which we continuously monitor. When we do not have necessary spares in inventory or our spares become obsolete, we rely on third parties to develop necessary parts.

The terms of our Credit Facility require us to maintain in-orbit insurance covering losses from satellite failures for a period of time with respect to our Iridium NEXT satellites. See “Our Network—Iridium NEXT” below. Once this requirement lapses, we do not expect to continue to maintain in-orbit insurance covering losses from satellite failures or other operational problems affecting the Iridium NEXT constellation.

Our first-generation satellite constellation license from the FCC has been extended until July 31, 2019, and may be extended again if we request. We also hold a space station license for the launch and operation of our Iridium NEXT constellation, which expires February 23, 2032. Our U.S. gateway earth station and the U.S. government customer and commercial subscriber earth station licenses expire between October 2021 and 2026. We must file renewal applications for earth station licenses between 30 and 90 days prior to expiration.

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Iridium NEXT

We recently completed the process of replacing our first-generation constellation with our Iridium NEXT satellite constellation, which supports new services and higher data speeds for new products. We deployed a total of75 Iridium NEXT satellites on eight Falcon 9 rockets launched by SpaceX.

The Iridium NEXT constellation also hosts the Aireon system. The Aireon system was developed by Aireon LLC, which we formed in 2011, with subsequent investments from the ANSPs of Canada, Italy, the United Kingdom, Denmark and Ireland, to provide a global air traffic surveillance service through a series of ADS-B receivers on the Iridium NEXT satellites, which were activated on an individual basis as the Iridium NEXT satellite began carrying traffic in our constellation. Aireon has contracted to offer this service to our co-investors in Aireon, as well as other ANSPs, and plans to offer the service to other customers worldwide, including the FAA. The FAA recently announced that it will run operational trials of the Aireon system beginning in 2020. These ANSPs will use the service to provide improved air traffic control services over the oceans, as well as polar and remote regions. Aireon also plans to market the data to airlines and other users. Under our agreements with Aireon, Aireon will pay us fees of$200.0 million to host the ADS-B receivers on Iridium NEXT, of which they have paid us$43.1 million as of December 31, 2018, as well as power and data services fees of up to approximately$22.6 million per year, once Aireon achieves specified customer milestones, for the delivery of the air traffic surveillance data over the Iridium NEXT system.

While the Aireon ADS-B receivers are the primary hosted payload on the Iridium NEXT satellites, we have also entered into an agreement with Harris for it to utilize the remaining space for payloads it has constructed for its customers. We expect this agreement to result in an additional$74.1 million in hosting and prepaid data service fees, of which Harris has paid us$64.9 million as of December 31, 2018.

As required by our Credit Facility, we obtained insurance covering the launch and first 12 months of operation of the Iridium NEXT satellites. We do not expect to insure the operation of our Iridium NEXT satellites beyond the timeframe required by our lenders.

Full Scale Development and Launch Services Agreements

In June 2010, we executed a primarily fixed price full scale development contract, or FSD, with Thales Alenia Space for the design and manufacture of satellites for Iridium NEXT. The total price under the FSD will be approximately$2.3 billion, and we expect our payment obligations under the FSD to extend into 2019. As of December 31, 2018, we had made total payments of$2.2 billion to Thales Alenia Space, of which$1.5 billion were from borrowings under the Credit Facility. We used the Credit Facility to pay85% of each invoice received from Thales Alenia Space under the FSD with the remaining15% funded from cash on hand until the Credit Facility was fully drawn in February 2017. We now pay 100% of each of the remaining invoices received from Thales Alenia Space from cash on hand.

In March 2010, we entered into an agreement with SpaceX as the primary launch services provider for Iridium NEXT. The contract price under the SpaceX agreement is$448.9 million for seven launches. In November 2016, we entered into an additional agreement with SpaceX for an eighth Falcon 9 launch for a contract price of$61.9 million. Although we are the customer of record with SpaceX, we contracted separately with GFZ German Research Centre for Geosciences, or GFZ, for$29.8 million to share the launch of NASA’s two Gravity Recovery and Climate Experiment Follow-On satellites on a specially designed dispenser on the Falcon 9 rocket. As of December 31, 2018, we had made aggregate payments of$498.9 million to SpaceX, and received the full$29.8 million from GFZ. As of January 2019, all contracted launches with SpaceX were completed.

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Aireon Holdings LLC Agreement

In November 2012, we, through our Iridium Satellite subsidiary, and Aireon entered into an Amended and Restated Limited Liability Company Agreement with NAV CANADA, the ANSP of Canada, and a wholly owned subsidiary of NAV CANADA. In February 2014, we entered into a Second Amended and Restated Limited Liability Company Agreement, or the Aireon LLC Agreement, with NAV CANADA; Enav S.p.A., the ANSP of Italy; Naviair, the ANSP of Denmark; Irish Aviation Authority Limited, the ANSP of Ireland, or IAA; and wholly owned subsidiaries of NAV CANADA, Enav and Naviair. In May 2018, we entered into a Third Amended and Restated Limited Liability Company Agreement, or the Aireon LLC Agreement, with NAV CANADA; Enav; NATS (Services) Limited, the ANSP of the United Kingdom; Naviair; IAA; and wholly owned subsidiaries of NAV CANADA, Enav, NATS, Naviair, and IAA. In December 2018, in connection with Aireon’s entry into a debt facility, we and the other Aireon investors contributed our interests in Aireon into a new holding company, Aireon Holdings LLC, and entered into an Amended and Restated Aireon Holdings LLC Agreement. Aireon Holdings holds 100% of the membership interests in Aireon LLC, which remains the operating entity.

Under the Aireon Holdings LLC Agreement, we hold a common membership interest, and the other investors hold preferred membership interests resulting from their investments in Aireon for an aggregate purchase price of approximately$339 million. If and when funds are available, Aireon Holdings is required to redeem a portion of our ownership interest for a payment of$120 million, following which NAV CANADA’s subsidiary will hold a45% interest in Aireon Holdings, and the other ANSP subsidiaries will collectively hold a33% interest, with Iridium retaining a22% interest. Based on Aireon’s business plan and restrictions under Aireon’s debt facility, we do not expect this redemption of our ownership interest to occur before early 2022.

The Aireon Holdings LLC Agreement provides for Aireon Holdings to be managed by a board of directors consisting of 11 members. Currently, we may nominate two directors, NAV CANADA may nominate five directors, Enav and NATS may each nominate one director, and Naviair and IAA may together nominate one director. The chief executive officer of Aireon Holdings serves as the eleventh director. The Aireon Holdings LLC Agreement also provides the minority-interest holders with several protective provisions.

Constellation De-Orbiting Obligations

We have certain de-orbit obligations under our FCC licenses. Specifically, pursuant to an orbital debris mitigation plan incorporated into our FCC satellite constellation license in 2002, we are required to lower each of our first-generation satellites to an orbit with a perigee of approximately 250 kilometers as it reaches the end of its useful life and to coordinate these orbit-lowering maneuvers with the U.S. Combined Space Operations Center. In August 2014, we received a license modification from the FCC permitting us to operate up to ten of our first-generation satellites pursuant to the less stringent 25 year de-orbit standards for non-geostationary satellites that the FCC acknowledged in 2004 would serve the public interest and has been utilized for other satellite constellations since that time. All of our Iridium NEXT satellites are subject to the less stringent 25 year de-orbit standard.

Our FCC license requires us to de-orbit a first-generation satellite following its replacement with an Iridium NEXT constellation satellite and to notify the FCC within 30 days following removal of a first-generation satellite from its operational orbit for purposes of de-orbit. We began de-orbiting individual satellites as they were replaced with Iridium NEXT satellites. We expect to complete the required de-orbit initiation process for our first-generation satellites during 2019.

Competition

The mobile satellite services industry is highly competitive but has significant barriers to entry, including the cost and difficulty associated with obtaining spectrum licenses and successfully building and launching a satellite network. In addition to cost, there is a significant amount of lead time associated with obtaining the required licenses, building and launching the satellite constellation, and deploying the ground network technology. We currently face substantial competition from other service providers that offer a range of mobile and fixed communications options. Currently, our principal mobile satellite services competitors are Inmarsat, Globalstar, Thuraya Telecommunications Co., or Thuraya, and ORBCOMM. We compete primarily on the basis of coverage, quality, mobility and pricing of services and products.

Inmarsat owns and operates a fleet of GEO satellites. Unlike LEO satellites, GEO satellites orbit the earth at approximately 22,300 miles above the equator. GEO operators require substantially larger and more expensive antennas, and typically have higher transmission delays than LEO operators. Due to its GEO system, Inmarsat’s coverage area extends and covers most bodies of water except for a majority of the polar regions. Inmarsat is the leading provider of satellite communications services to the maritime sector. Inmarsat also offers land-based and aviation communications services.

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Globalstar owns and operates a fleet of LEO satellites. Globalstar’s service is available only on a multi-regional basis as a result of its “bent pipe” architecture, which requires that voice and data transmissions be routed from satellites immediately to nearby ground stations. This design requires the use of multiple ground stations, which are impractical in extreme latitudes or over oceans. Unlike Inmarsat and us, Globalstar sells a higher percentage of its products and services directly to end users.

ORBCOMM also provides commercial services using a fleet of LEO satellites. Like Globalstar, ORBCOMM’s network also has a “bent pipe” architecture, which limits its real-time coverage area. ORBCOMM’s principal focus is low-cost data and IoT services, where it directly competes with our IoT offerings. Because a ground station may not be within view of a satellite, ORBCOMM’s services may have a significant amount of latency, which may limit their use in some mission-critical applications. It does not offer voice service or high-speed data services.

We also compete with regional mobile satellite communications services in several geographic markets. In these cases, the majority of our competitors’ customers require regional, not global, mobile voice and data services, so our competitors may present a viable alternative to our services. All of these regional competitors operate or plan to operate GEO satellites. Our regional mobile satellite services competitors currently include Thuraya, principally in Europe, the Middle East, Africa, Australia and several countries in Asia.

While we view our services as largely complementary to terrestrial wireline and wireless communications networks, we also compete with them indirectly. We provide service in areas that are inadequately covered by these ground systems. To the extent that terrestrial communications companies invest in underdeveloped areas, we will face increased competition in those areas. We believe that local telephone companies currently are reluctant to invest in new switches, landlines and cellular towers to expand their networks in rural and remote areas due to high costs and limited usage. Many of the underdeveloped areas are sparsely populated, making it difficult to generate the necessary returns on the capital expenditures required to build terrestrial wireless networks in those areas. We believe that our solutions offer a cost-effective and reliable alternative to terrestrial-based wireline and wireless systems in these remote regions.

Research and Development

Our research and development efforts have focused on the development, design and testing of the Iridium NEXT constellation and new products and services, such as Iridium Certus, Iridium Edge, Iridium PTT, Iridium Burst, Iridium Pilot Land Station, Iridium GO!, and chipsets. We also develop product and service enhancements and new applications for our existing products and services. Our research and development expenses were$22.4 million,$15.2 million and$16.1 million for the years ended December 31, 2018, 2017 and 2016, respectively.

Employees

As of December 31, 2018, we had469 full-time employees and6 part-time employees, none of whom are subject to any collective bargaining agreement. We consider our employee relations to be good.

Intellectual Property

At December 31, 2018, we held21 U.S. patents andone foreign patent. These patents cover several aspects of our satellite system, our global network, our communication services, and our devices.

In addition to our owned intellectual property, we also license critical intellectual property from Motorola Solutions to operate and maintain our network and related ground infrastructure and services as well as to design and manufacture our devices. This intellectual property is essential to our ability to continue to operate our constellation and sell our services and devices. We maintain our licenses with Motorola Solutions pursuant to several agreements, which can be terminated by Motorola Solutions upon the commencement by or against us of any bankruptcy proceeding or other specified liquidation proceedings or upon our material failure to perform or comply with any provision of the agreements. If Motorola Solutions were to terminate any such agreement, it may be difficult or, under certain circumstances, impossible to obtain the technology from alternative vendors. Motorola Solutions has assigned to a third party a portion of the patents that are covered by some of these licenses.

We license additional intellectual property and technology from other third parties and expect to do so in the future in connection with our network and related ground infrastructure and services as well as our devices. If any such third party were to terminate its agreement with us or cease to support and service such intellectual property or technology, or if we are unable to renew such licenses on commercially reasonable terms or at all, it may be difficult, more expensive or impossible to obtain substitute intellectual property or technology from alternative vendors. Any substitute intellectual property or technology may also have lower quality or performance standards, which would adversely affect the quality of our devices and services. For

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more information, see “Risk Factors—We are dependent on intellectual property licensed from third parties to operate our constellation and sell our devices and for the enhancement of our existing devices and services.”

Available Information

Copies of our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and amendments, if any, to those reports filed pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, are available free of charge through our website at www.iridium.com and on the website of the Securities and Exchange Commission, or SEC, at www.sec.gov. A request for any of these reports may also be submitted to us by writing: Investor Relations, Iridium Communications Inc., 1750 Tysons Boulevard, Suite 1400, McLean, VA 22102, or by calling our Investor Relations line at 703-287-7570.

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Item 1A. Risk Factors

Our business plan depends on increased demand for mobile satellite services, among other factors.

Our business plan is predicated on growth in demand for mobile satellite services. Demand for mobile satellite services may not grow, or may even contract, either generally or in particular geographic markets, for particular types of services or during particular time periods. A lack of demand could impair our ability to sell products and services, develop and successfully market new products and services and could exert downward pressure on prices. Any decline in prices would decrease our revenue and profitability and negatively affect our ability to generate cash for capital expenditures, investments and other working capital needs.

Our ability to successfully implement our business plan will also depend on a number of other factors, including:

• our ability to maintain the health, capacity and control of our satellite constellation;

• the level of market acceptance and demand for our products and services;

• our ability to introduce innovative new products and services that satisfy market demand, including new product and service offerings on Iridium NEXT;

• our ability to expand our business using our existing spectrum resources both in the United States and internationally;

• our ability to sell our products and services in additional countries;

• our ability to maintain our relationship with U.S. government customers, particularly the DoD;

• the ability of our distributors to market and distribute our products, services and applications effectively and their continued development of innovative and improved solutions and applications for our products and services;

• the effectiveness of our competitors in developing and offering similar services and products;

• our ability to continue to de-orbit our first-generation satellites; and

• our ability to maintain competitive prices for our products and services and to control our costs.

We have a considerable amount of debt which may limit our ability to fulfill our obligations and/or to obtain additional financing.

As of December 31, 2018, we had$2,044.9 million of consolidated gross indebtedness on an actual basis, consisting of$1,684.9 million of indebtedness outstanding under the Credit Facility and$360.0 million of indebtedness outstanding under our senior unsecured notes, or the Notes.

Our capital structure can have several important consequences, including, but not limited to, the following:

• If future cash flows are insufficient, we may not be able to make principal or interest payments on our debt obligations, which could result in the occurrence of an event of default under one or more of those debt instruments.

• Our leverage level could increase our vulnerability to adverse economic and industry conditions.

• Our indebtedness could require us to dedicate a substantial portion of our cash flow from operations to payments on our debt (including scheduled principal repayments on the outstanding borrowings under the Credit Facility), thereby reducing the availability of our cash flow for operations and other purposes.

• Our leverage level could make it more difficult for us to satisfy our obligations to our lenders, resulting in possible defaults on and acceleration of such indebtedness.

• Our leverage level could place us at a competitive disadvantage compared to any competitors that have less debt or comparable debt at more favorable interest rates and that, as a result, may be better positioned to withstand economic downturns.

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• Our consolidated indebtedness has the general effect of reducing our flexibility to react to changing business and economic conditions insofar as they affect our financial condition. The interest rates at which we might secure additional financings may be higher than our currently outstanding debt instruments or higher than forecasted at any point in time, which could adversely affect our business, financial condition, results of operations and cash flows.

• Market conditions could affect our access to capital markets, restrict our ability to secure financing to make the capital expenditures and investments and pay other expenses planned by us, which could adversely affect our business, financial condition, cash flows and results of operations.

Further, despite our substantial levels of indebtedness, we and our subsidiaries may have the ability to incur substantially more indebtedness, which could further intensify the risks described above.

We will need to refinance the Notes or our Credit Facility prior to October 15, 2022.

If any of the Notes remain outstanding on October 15, 2022, which is six months prior to the scheduled maturity of the Notes, the maturity of all amounts remaining outstanding under the Credit Facility would be accelerated from September 30, 2024 to October 15, 2022. Accordingly, prior to that date we will need to either refinance the Notes with debt that matures after the Credit Facility, or we will need to refinance the Credit Facility, or both. We may not be able to refinance either the Notes or the Credit Facility on favorable terms or at all. Our ability to refinance will depend on a range of factors, including our business performance, general economic conditions and the state of the capital markets.

If we do not generate sufficient cash flows, we may be unable to service all of our indebtedness.

To service our indebtedness, we will require a significant amount of cash. Our ability to generate cash, make scheduled payments or to refinance our debt obligations depends on our successful financial and operating performance, which may be affected by a range of economic, competitive and business factors, many of which are outside of our control and some of which are described elsewhere in the “Risk Factors” section of this Form 10-K.

If our cash flow and capital resources are insufficient to fund our debt service obligations, or to repay the Credit Facility when it matures, or the Notes when they mature, we may have to undertake alternative financing plans, such as refinancing or restructuring our debt, selling assets or operations, reducing or delaying capital investments, or seeking to raise additional capital. We may not be able to refinance our debt, or any refinancing of our debt could be at higher interest rates and may require us to comply with more restrictive covenants that could further restrict our business operations. Our ability to implement successfully any such alternative financing plans will depend on a range of factors, including general economic conditions, the level of activity in capital markets generally, and the terms of our various debt instruments then in effect.

The indenture governing the Notes and the Credit Facility contain cross-default or cross-acceleration provisions that may cause all of the debt issued under those instruments to become immediately due and payable because of a default under an unrelated debt instrument.

Our failure to comply with the obligations contained in the indenture governing the Notes, the Credit Facility or other instruments governing our indebtedness could result in an event of default under the applicable instrument, which could result in the related debt and the debt issued under other instruments (together with accrued and unpaid interest and other fees) becoming immediately due and payable. In such event, we would need to raise funds from alternative sources, which funds may not be available to us on favorable terms, on a timely basis, or at all. Alternatively, such a default could require us to sell our assets and otherwise curtail our operations in order to pay our creditors. These alternative measures could have a material adverse effect on our business, financial position, results of operations and/or cash flows, which could cause us to become bankrupt or insolvent or otherwise impair our ability to make payments in respect of our indebtedness.

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Adverse changes in our credit ratings or withdrawal of the ratings assigned to our debt securities by rating agencies may negatively affect us.

Our ability to access capital markets is important to our ability to operate our business. Increased scrutiny of the satellite industry and the impact of regulation, as well as changes in our financial performance and unfavorable conditions in the capital markets could result in credit agencies reexamining our credit ratings. A downgrade in our credit ratings could restrict or discontinue our ability to access capital markets at attractive rates and increase our borrowing costs. Furthermore, any rating assigned could be lowered or withdrawn entirely by a rating agency if, in that rating agency’s judgment, future circumstances relating to the basis of the rating, such as adverse changes, so warrant. Any future lowering of our ratings likely would make it more difficult or more expensive for us to obtain additional debt financing.

If we default under the Credit Facility, the lenders may require immediate repayment in full of amounts borrowed or foreclose on our assets.

The Credit Facility contains events of default, including:

• non-compliance with the covenants under the Credit Facility, including financial covenants and covenants relating to hosted payloads;

• cross-default with other indebtedness;

• insolvency of any obligor under the Credit Facility;

• revocation of the insurance policy with Bpifrance Assurance Export S.A.A., or BPIAE, that insures the substantial majority of our obligations; and

• a determination by the lenders that we have experienced a material adverse change in our business.

Some of these events of default are outside of our control or otherwise difficult to satisfy. If we experience an event of default, the lenders may require repayment in full of all principal and interest outstanding under the Credit Facility. It is unlikely we would have adequate funds to repay such amounts prior to the scheduled maturity of the Credit Facility. If we fail to repay such amounts, the lenders may foreclose on the assets we have pledged under the Credit Facility, which includes substantially all of our assets and those of our domestic subsidiaries.

Certain provisions in the Credit Facility and in the indenture governing the Notes limit our financial and operating flexibility.

The Credit Facility and the indenture governing the Notes contain numerous financial and operating covenants that place significant restrictions on, among other things, our ability to:

• make capital expenditures;

• carry out mergers and acquisitions;

• dispose of, or grant liens on, our assets;

• enter into transactions with our affiliates;

• pay dividends or make distributions to our stockholders;

• incur indebtedness;

• prepay indebtedness; and

• make loans, guarantees or indemnities.

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Our Credit Facility also requires us to meet certain financial ratios, such as maintaining a debt-to-equity ratio and debt service coverage ratio, and specifies minimum available cash balances, maximum levels of annual capital expenditures, and maximum leverage levels. Our ability to comply with these and other requirements and restrictions may be affected by changes in economic or business conditions, results of operations or other events beyond our control. A failure to comply with the obligations contained in any of the instruments governing our consolidated indebtedness could impair our ability to make payments owed and result in acceleration of related debt and the acceleration of debt under other instruments evidencing indebtedness that may contain cross‑acceleration or cross‑default provisions.

The Credit Facility also prohibits us from paying dividends to holders of our Series B Preferred Stock for a period of five quarters, and at any point beyond that if we are unable to certify that we anticipate being able to comply with the financial covenants of the Credit Facility for the next twelve months each time we declare a dividend. If we are unable to make that certification, we will not be able to pay the dividends on our outstanding preferred stock. As required by our amended Credit Facility, we announced a five-quarter deferral of dividends on the Series B Preferred Stock beginning with the dividends due June 15, 2018. If we do not pay dividends on our preferred stock for six quarterly periods (whether or not consecutive), the holders of the Series B Preferred Stock will have the power to elect two members of our board of directors. The interests of the holders of our preferred stock may differ from those of our other stockholders. In addition, any dividend we fail to pay will accrue, and the holders of our Series B Preferred Stock will be entitled to a preferential distribution of the original purchase price per share plus all accrued and unpaid dividends before any distribution may be made to holders of our common stock in connection with any liquidation event. Complying with these restrictions may make it more difficult for us to successfully execute our business plan and compete against companies who are not subject to such restrictions.

The LIBOR calculation method may change, and LIBOR is expected to be phased out after 2021.

A portion of our Credit Facility bears interest at a rate based on the London Interbank Offered Rate, or LIBOR. On July 27, 2017, the U.K. Financial Conduct Authority, or the FCA, announced that it will no longer require banks to submit rates for the calculation of LIBOR after 2021. In the meantime, actions by the FCA, other regulators, or law enforcement agencies may result in changes to the method by which LIBOR is calculated. If changes to LIBOR result in an increase in rates, our interest expense under the Credit Facility would increase. Further, if LIBOR is no longer available, we and our Credit Facility lenders may be required to determine a substitute rate, and if such substitute rate is higher than LIBOR, our interest expense under the Credit Facility would increase.

Our in-orbit satellite insurance only covers the first twelve months of operations of our Iridium NEXT satellites, as a result of which we may be subject to increased costs.

The insurance we have on our in-orbit Iridium NEXT satellites only covers in-orbit failures of our satellites for a period of twelve months from the date of launch. As a result, a failure of one or more of our satellites, or the occurrence of equipment failures and other related problems, could constitute an uninsured loss and could harm our financial condition. Furthermore, this insurance does not cover lost revenue.

Our Iridium NEXT satellites have a limited life and may fail prematurely, which would cause our network to be compromised and materially and adversely affect our business, prospects and profitability.

We may experience in-orbit malfunctions of Iridium NEXT satellites, which could adversely affect the reliability of their service or result in total failure of the satellite. In-orbit failure of a satellite may result from various causes, including component failure, loss of power or fuel, inability to control positioning of the satellite, solar or other astronomical events, including solar radiation and flares, and space debris. Other factors that could affect the useful lives of our satellites include the quality of construction, gradual degradation of solar panels and the durability of components. Radiation-induced failure of satellite components may result in damage to or loss of a satellite before the end of its expected life. Although we do not incur any direct cash costs related to the failure of a satellite, if a satellite fails, we record an impairment charge in our statement of operations to reduce the remaining net book value of that satellite to zero, and any such impairment charges could depress our net income for the period in which the failure occurs.

From time to time, we are advised by our customers and end users of temporary intermittent losses of signal cutting off calls in progress, preventing completions of calls when made or disrupting the transmission of data. If the magnitude or frequency of such problems increase and we are no longer able to provide a commercially acceptable level of service, our business and financial results and our reputation would be hurt and our ability to pursue our business plan would be compromised.

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We may be required in the future to make further changes to our constellation to maintain or improve its performance. Any such changes may require prior FCC approval, and the FCC may subject the approval to other conditions that could be unfavorable to our business. In addition, from time to time we may reposition our satellites within the constellation in order to optimize our service, which could result in degraded service during the repositioning period. Although we have some ability to remedy some types of problems affecting the performance of our satellites remotely from the ground, the physical repair of our satellites in space is not feasible.

We will have to de-orbit all of our remaining first-generation satellites, and we may not be able to obtain or maintain adequate de-orbit insurance.

Our FCC license requires us to de-orbit a first-generation satellite following its replacement with an Iridium NEXT constellation satellite and to notify the FCC within 30 days following removal of a first-generation satellite from its operational orbit for purposes of de-orbit, subject to the license modification that we have been granted with respect to up to 18 first-generation satellites we may keep as spares.

Our current insurance policy covers amounts that we and other specified parties may become liable to pay for bodily injury and property damages to third parties related to a de-orbit of our first-generation satellites. Our current policy has a one-year term, which expires on December 8, 2019, and covers all remaining first-generation satellites. The price, terms and availability of insurance have fluctuated significantly since we began offering commercial satellite services. The cost of obtaining insurance can vary as a result of either satellite failures or general conditions in the insurance industry. Higher premiums on insurance policies would increase our cost. De-orbit liability insurance policies on satellites may not continue to be available on commercially reasonable terms or at all or in sufficient amount to cover the planned de-orbit, over time, of all satellites in our first-generation constellation. In addition to higher premiums, insurance policies may provide for higher deductibles, shorter coverage periods and additional policy exclusions. For example, our current de-orbit insurance covers only twelve months from attachment and therefore would not cover losses arising outside that timeframe. In addition, even if we continue to maintain a de-orbit liability insurance policy, the coverage may not protect us against all third-party losses, which could be material.

Our agreements with U.S. government customers, particularly the DoD, which represent a significant portion of our revenue, expire in 2019 and are also subject to termination.

The U.S. government, through a dedicated gateway owned and operated by the DoD, has been and continues to be, directly and indirectly, our largest customer, representing20% and24% of our revenue for the years ended December 31, 2018 and 2017, respectively. We provide the majority of our services to the U.S. government pursuant to our GMSS and EMSS contracts. We entered into these contracts in September 2013 and October 2013, respectively. The GMSS contract provided for a one-year base term and four additional one-year options exercisable at the election of the U.S. government, all of which were exercised, and the EMSS contract provided for a five-year term. The government has extended each of these contracts through early 2019 pursuant to federal acquisition regulations. We are currently negotiating renewals of these contracts, but we can provide no assurance that we will be able to do so on favorable terms, or at all. Further, the U.S. government may terminate these agreements, in whole or in part, at any time for its convenience. Our relationship with the U.S. government is also subject to the overall U.S. government budget and appropriation decisions and processes. U.S. government budget decisions, including with respect to defense spending, are based on changing government priorities and objectives, which are driven by numerous factors, including geopolitical events and macroeconomic conditions, and are beyond our control. If the U.S. government terminates or fails to renew either of the agreements, we would lose a significant portion of our revenue.

We are dependent on intellectual property licensed from third parties to operate our constellation and sell our devices and for the enhancement of our existing devices and services.

We license critical intellectual property and technology to operate and maintain our network and related ground infrastructure and services as well as to design, manufacture, and sell our devices. This intellectual property and technology is essential to our ability to continue to operate our constellation and sell our services and devices. In addition, we are dependent on third parties to develop enhancements to our current services and services even in circumstances where we own the intellectual property. If any third-party owner of such intellectual property or technology were to terminate any license agreement with us or cease to support and service such intellectual property or technology or perform development on our behalf, or if we are unable to renew such licenses on commercially reasonable terms or at all, it may be difficult, more expensive or impossible to obtain such intellectual, technology, or services from alternative vendors. Any substitute intellectual property or technology may also be costly to develop and integrate, or could have lower quality or performance standards, which would adversely affect the quality of our devices and services. In connection with the development of new devices and services, we may be required to obtain additional intellectual property rights from third parties. We can offer no assurance that we will be able to obtain such

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intellectual property rights on commercially reasonable terms or at all. If we are unable to obtain such intellectual property rights on commercially reasonable terms, we may not be able to develop new devices and services.

Our products could fail to perform or could perform at reduced levels of service because of technological malfunctions or deficiencies or events outside of our control, which would seriously harm our business and reputation.

Our products and services are subject to the risks inherent in a large-scale, complex telecommunications system employing advanced technology. Any disruption to our satellites, services, information systems or telecommunications infrastructure could result in the inability of our customers to receive our services for an indeterminate period of time. These customers include government agencies conducting mission-critical work throughout the world, as well as consumers and businesses located in remote areas of the world and operating under harsh environmental conditions where traditional telecommunications services may not be readily available. Any disruption to our services or extended periods of reduced levels of service could cause us to lose customers or revenue, result in delays or cancellations of future implementations of our products and services, result in failure to attract customers, or result in litigation, customer service or repair work that would involve substantial costs and distract management from operating our business. The failure of any of the diverse elements of our system, including our satellites, our commercial gateway, our satellite teleport network facilities or our satellite network operations center, to function as required could render our system unable to perform at the quality and capacity levels required for success. Any system failures, repeated product failures or shortened product life, or extended reduced levels of service could reduce our sales, increase costs, or result in warranty or liability claims or litigation, cause us to extend our warranty period, and seriously harm our business.

Our failure to effectively manage the expansion of our portfolio of products and services could impede our ability to execute our business plan, and we may experience increased costs or disruption in our operations.

In order to achieve the substantial future revenue growth we have projected, we must develop and market new products and services, such as Iridium Certus. We currently face a variety of challenges, including maintaining the infrastructure and systems necessary for us to manage the growth of our business. As our product and service portfolio continues to expand, the responsibilities of our management team and other company resources also grow. Consequently, we may further strain our management and other company resources with the increased complexities and administrative burdens associated with a larger, more complex portfolio of products and services. For example, we have in the past experienced quality issues and incorrect market assessments in connection with the introduction of new products and services, and we may experience such issues in the future. Our failure to meet these challenges as a result of insufficient management or other resources could significantly impede our ability to execute our business plan, which relies in part on our ability to leverage our largely fixed-cost infrastructure. To properly manage our growth, we may need to hire and retain additional personnel, upgrade our existing operational management and financial and reporting systems, and improve our business processes and controls. Failure to effectively manage the expansion of our portfolio of products and services in a cost-effective manner could result in declines in product and service quality and customer satisfaction, disruption of our operations, or increased costs, any of which would reduce our ability to increase our profitability.

As we and our distributors expand our offerings to include more consumer-oriented devices, we are more likely to be subject to product liability claims, recalls or litigation, which could adversely affect our business and financial performance.

Through our distributors, we offer several devices and services aimed at individual consumers, and we and our distributors continue to introduce additional devices and services. These devices and services, such as satellite handsets, personal locator devices and location-based services, can contain design and manufacturing defects. Defects may also occur in components and devices that we purchase from third parties. There can be no assurance we will be able to detect and fix all defects in the hardware, software and services that we sell. Further, these devices and services may be used in isolated and dangerous locations, including emergency response situations, and users who suffer property damage, personal injury or death while using the device or service may seek to assert claims or bring lawsuits against us. Further, it is possible that our devices could become the subject of consumer protection investigations, enforcement actions, or litigation, including class actions. We seek to limit our exposure to all of these claims by maintaining a consumer protection compliance program, and through appropriate notices, disclosures, indemnification provisions and disclaimers, but these steps may not be effective. We also maintain product liability insurance, but this insurance may not cover any particular claim or litigation, or the amount of insurance may be inadequate to cover the claims brought against us. Product liability insurance could become more expensive and difficult to maintain and might not be available on acceptable terms or at all. In addition, it is possible that our devices could become the subject of a product recall as a result of a device defect. We do not maintain recall insurance, so any recall could have a significant effect on our financial results. In addition to the direct expenses of product liability claims, investigations, recalls and litigation, a claim, investigation, recall or litigation might cause us adverse publicity, which could harm our reputation and compromise our ability to sell our devices in the future.

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The collection, storage, transmission, use and disclosure of user data and personal information could give rise to liabilities or additional costs as a result of laws, governmental regulations, and evolving views of personal privacy rights and information security standards.

We transmit, process, and in some cases store in the normal course of our business, end user data, including personal information. Many jurisdictions around the world have adopted laws and regulations regarding the collection, storage, transmission, use and disclosure of personal information. The legal standards for processing, storing and using this personal information continue to evolve, impose additional obligations and risk on our business, and have the potential to make some of our business processes more costly or less feasible. For example, the European Commission has enacted the General Data Protection Regulation, or GDPR, which became effective in May 2018. The GDPR superseded prior EU data protection legislation, imposes more stringent EU data protection requirements, and provides for greater penalties for noncompliance.

In addition, the interpretation of privacy and data protection laws and regulations regarding the collection, storage, transmission, use and disclosure of such information in some jurisdictions remains unclear. These laws may be interpreted, applied and enforced in conflicting ways from country to country and in a manner that is not consistent with our current business practices. Complying with these varying privacy and data security legal requirements could cause us to incur additional costs and change our business practices. Further, our services are accessible in many foreign jurisdictions, and some of these jurisdictions may claim that we are required to comply with their laws, even where we have no operating entity, employees or infrastructure located in that jurisdiction. We could face direct expenses related to a variety of enforcement actions, government investigations, or litigation, and an interruption to our business and adverse publicity because of such enforcement actions, government investigations, or litigation. Such enforcement actions, government investigations, or litigation could also cause us to incur significant expenses if we were required to modify our products, our services, our infrastructure, or our existing security and privacy procedures in order to comply with new or expanded privacy and security regulations.

In addition, if end users allege that their personal information is not collected, stored, transmitted, used or disclosed by us or our business partners appropriately or in accordance with our policies or applicable laws, or that our failure to adequately secure their personal information compromised its security, we could have liability to them or to consumer protection agencies, including claims, investigations and litigation related to such allegations. Any failure on our part to protect end users’ personal information could result in a loss of user confidence, hurt our reputation, result in the loss of users, and cause us to incur significant expenses.

Our satellites may collide with space debris or another spacecraft, which could adversely affect the performance of our constellation.

In February 2009, we lost an operational satellite as a result of a collision with a non-operational Russian satellite. Although we have some ability to actively maneuver our satellites to avoid potential collisions with space debris or other spacecraft, this ability is limited by, among other factors, uncertainties and inaccuracies in the projected orbit location of and predicted conjunctions with debris objects tracked and cataloged by the U.S. government. Additionally, some space debris is too small to be tracked and therefore its orbital location is completely unknown; nevertheless, this debris is still large enough to potentially cause severe damage or a failure of our satellites should a collision occur. If our constellation experiences additional satellite collisions with space debris or other spacecraft, our service could be impaired.

The space debris created by the February 2009 satellite collision may cause damage to other spacecraft positioned in a similar orbital altitude.

The 2009 collision of one of our satellites with a non-operational Russian satellite created a space debris field concentrated in the orbital altitude where the collision occurred, and thus increased the risk of space debris damaging or interfering with the operation of our satellites, which travel in this orbital altitude, as well as satellites owned by third parties, such as U.S. or foreign governments or agencies and other satellite operators. Although there are tools used by us and providers of tracking services, such as the U.S. Combined Space Operations Center, to detect, track and identify space debris, we or third parties may not be able to maneuver the satellites away from such debris in a timely manner. Any such collision could potentially expose us to significant losses and liability if we were found to be at fault.

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If we experience operational disruptions with respect to our commercial gateways or operations center, we may not be able to provide service to our customers.

Our commercial satellite network traffic is supported by gateways in Tempe, Arizona, and Izhevsk, Russia, for traffic within Russian boundaries, and we operate our satellite constellation from our satellite network operations center in Leesburg, Virginia. Currently, we do not have a backup facility for our primary gateway in Arizona, and our facilities are subject to the risk of significant malfunctions or catastrophic loss due to unanticipated events and would be difficult to replace or repair and could require substantial lead-time to do so. Material changes in the operation of these facilities may be subject to prior FCC approval, and the FCC might not give such approval or may subject the approval to other conditions that could be unfavorable to our business. Our gateways and operations center may also experience service shutdowns or periods of reduced service in the future as a result of equipment failures, delays in deliveries or regulatory issues. Any such failure would impede our ability to provide service to our customers.

We could lose market share and revenue as a result of increasing competition from companies in the wireless communications industry, including cellular and other satellite operators, and from the extension of land-based communications services.

We face intense competition in all of our markets, which could result in a loss of customers and lower revenue and make it more difficult for us to enter new markets. We compete primarily on the basis of coverage, quality, portability, and pricing of services and products.

The provision of satellite-based services and products is subject to downward price pressure when capacity exceeds demand or as a result of aggressive discounting by some operators under financial pressure to expand their respective market share. In addition, we may face competition from new competitors, new technologies or new equipment, including proposed new LEO constellations. For example, we may face competition for our land-based services in the United States from incipient ancillary terrestrial component, or ATC, service providers who are designing a satellite operating business and a terrestrial component around their spectrum holdings. In addition, some of our competitors have announced plans for the launch of additional satellites. As a result of competition, we may not be able to successfully retain our existing customers and attract new customers.

In addition to our satellite-based competitors, terrestrial voice and data service providers, both wireline and wireless, could further expand into rural and remote areas and provide the same general types of services and products that we provide through our satellite-based system. Although satellite communications services and terrestrial communications services are not perfect substitutes, the two compete in some markets and for some services. Consumers generally perceive terrestrial wireless voice communication products and services as cheaper and more convenient than those that are satellite-based. Many of our terrestrial competitors have greater resources, wider name recognition and newer technologies than we do. In addition, industry consolidation could hurt us by increasing the scale or scope of our competitors, thereby making it more difficult for us to compete.

Our customized hardware and software may be difficult and expensive to service, upgrade or replace.

Some of the hardware and software we use in operating our gateways is significantly customized and tailored to meet our requirements and specifications and could be difficult and expensive to service, upgrade or replace. Although we maintain inventories of some spare parts, it nonetheless may be difficult, expensive or impossible to obtain replacement parts for the hardware due to a limited number of those parts being manufactured to our requirements and specifications. In addition, our business plan contemplates updating or replacing some of the hardware and software in our network as technology advances, but the complexity of our requirements and specifications may present us with technical and operational challenges that complicate or otherwise make it expensive or infeasible to carry out such upgrades and replacements. If we are not able to suitably service, upgrade or replace our equipment, our ability to provide our services and therefore to generate revenue could be harmed.

Rapid and significant technological changes in the satellite communications industry may impair our competitive position and require us to make significant additional capital expenditures.

The satellite communications industry is subject to rapid advances and innovations in technology. We may face competition in the future from companies using new technologies and new satellite systems. New technology could render our system obsolete or less competitive by satisfying customer demand in more attractive ways or through the introduction of incompatible standards. Particular technological developments that could adversely affect us include the deployment by our competitors of new satellites with greater power, flexibility, efficiency or capabilities than ours, as well as continuing improvements in

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terrestrial wireless technologies. For us to keep up with technological changes and remain competitive, we may need to make significant capital expenditures, including capital to design and launch new products and services. Customer acceptance of the products and services that we offer will continually be affected by technology-based differences in our product and service offerings compared to those of our competitors. New technologies may also be protected by patents or other intellectual property laws and therefore may not be available to us. Any failure on our part to implement new technology within our system may compromise our ability to compete.

Use by our competitors of L-band spectrum for terrestrial services could interfere with our services.

In February 2003, the FCC adopted ATC rules that permit satellite service providers to establish terrestrial wireless networks in previously satellite-only bands, subject to certain requirements intended to ensure that terrestrial services remain ancillary to primary satellite operations. In 2011, Lightsquared (now known as Ligado Networks) was granted a waiver at the FCC to convert Ligado Network’s L-band satellite spectrum to terrestrial use including a 10 MHz band close to the spectrum that we use for all of our services.  That waiver was subsequently suspended in 2012 due to concerns about potential interference to GPS operations.  Ligado Networks sought another waiver in 2015 to modify the ATC of its L-band mobile satellite service network with a new proposal to address GPS industry concerns.  We oppose this waiver out of concern for the interference that Ligado Network’s proposed operations would cause to our operations in the L-band.

The implementation of ATC services by satellite service providers in the United States or other countries may result in terrestrial use of L-band spectrum in the 1.6 GHz band, which we use to provide our services, and such implementation may make it difficult for us to utilize the spectrum resources we require for our existing and future services. In addition, the FCC’s decision to permit ATC services was based on assumptions relating to the level of interference that the provision of ATC services would likely cause to other satellite service providers that use the L-band spectrum. If the FCC’s assumptions prove inaccurate, or the level of ATC services provided exceeds those estimated by the FCC, such as the proposed use by Ligado Networks, ATC services could substantially interfere with our satellites and devices, which would adversely affect our services. Outside the United States, other countries have implemented, or are considering implementing, regulations to facilitate ATC-like services.

Our networks and those of our third-party service providers may be vulnerable to security risks.

We expect the secure transmission of confidential information over public networks to continue to be a critical element of our ability to compete for business, manage our risks, and protect our customers and our reputation. Our network and those of our third-party service providers and our customers may be vulnerable to unauthorized access, computer attacks, viruses and other security problems. Persons who circumvent security measures could wrongfully access and obtain or use information on our network or cause service interruptions, delays or malfunctions in our devices, services or operations, any of which could harm our reputation, cause demand for our products and services to fall, and compromise our ability to pursue our business plans. Recently, there have been reported a number of significant, widespread security attacks and breaches that have compromised network integrity for many companies and governmental agencies, in some cases reportedly originating from outside the United States. In addition, there are reportedly private products available in the market today which may attempt to unlawfully intercept communications made using our network. We may be required to expend significant resources to respond to, contain, remediate, and protect against these attacks and threats, including compliance with applicable data breach and security laws and regulations, and to alleviate problems, including reputational harm and litigation, caused by these security incidents. In addition, in the event of such a security incident, our customer contracts may not adequately protect us against liability to third parties with whom our customers conduct business. Although we have implemented and intend to continue to implement security measures, these measures may prove to be inadequate. These security incidents could have a significant effect on our systems, devices and services, including system failures and delays that could limit network availability, which could harm our business and our reputation and result in substantial liability.

We are dependent on third parties to market and sell our products and services.

We select third-party distributors and rely on them to market and sell our products and services to end users and to determine the prices end users pay, in some cases on an exclusive basis. We also depend on our distributors to develop innovative and improved solutions and applications integrating our product and service offerings. As a result of these arrangements, we are dependent on the performance of our distributors to generate most of our revenue. Our distributors operate independently of us, and we have limited control over their operations, which exposes us to significant risks. Distributors may not commit the necessary resources to market and sell our products and services and may also market and sell competitive products and services. In addition, our distributors may not comply with the laws and regulatory requirements in their local jurisdictions, which could limit their ability to market or sell our products and services. If our distributors develop faulty or poorly performing products using our technology or services, we may be subject to claims, and our reputation could be harmed. If

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current or future distributors do not perform adequately, or if we are unable to locate competent distributors in particular countries and secure their services on favorable terms, we may be unable to increase or maintain our revenue in these markets or enter new markets, we may not realize our expected growth, and our brand image and reputation could be hurt.

In addition, we may lose distributors due to competition, consolidation, regulatory developments, business developments affecting our distributors or their customers, or for other reasons. In 2009, one of our largest competitors, Inmarsat, acquired our then largest distributor, Stratos Global Wireless, Inc., and in January 2014, Inmarsat acquired Globe Wireless, one of our service providers. Following each acquisition, Inmarsat essentially stopped promoting sales of our products and services, and they may further reduce their efforts in the future. Any future consolidation of our distributors would further increase our reliance on a few key distributors of our services and the amount of volume discounts that we may have to give those distributors. Our two largest distributors, Applied Satellite Technology LTD and Marlink Group, represented a total of11% of our revenue for the year ended December 31, 2018, and our ten largest distributors represented, in the aggregate,36% of our revenue for the year ended December 31, 2018. The loss of any of these distributors, or a decrease in the level of effort expended by any of them to promote our products and services, could reduce the distribution of our products and services as well as the development of new products and applications.

We rely on a limited number of key vendors for supply of equipment and services.

We currently rely on two manufacturers of our current devices, including our mobile handsets, L-Band transceivers, SBD devices and Iridium Pilot terminals. We also utilize sole source suppliers for some of the component parts of our devices. If any of our suppliers were to terminate its relationship with us, we may not be able to find a replacement supplier in a timely manner, at an acceptable price or at all.

Our manufacturer and suppliers may become capacity-constrained as a result of a surge in demand, a natural disaster or other event, or one or more component suppliers may decide to cease production of various components of our products, resulting in a shortage or interruption in supplies or an inability to meet increased demand. Although we may be able to replace sole source suppliers, there could be a substantial period of time in which our products would not be available; any new relationship may involve higher costs and delays in development and delivery, and we may encounter technical challenges in successfully replicating the manufacturing processes. If our manufacturers or suppliers terminate their relationships with us, fail to provide equipment or services to us on a timely basis, or fail to meet our performance expectations, we may be unable to provide products or services to our customers in a competitive manner, which could in turn negatively affect our financial results and our reputation.

In November 2016, we entered into a development services contract with Boeing, which will dedicate key Boeing personnel to continue the design and growth required for bringing new services and capabilities to our network. Technological competence is critical to our business and depends, to a significant degree, on the work of technically skilled personnel, such as these Boeing contractors. If Boeing’s performance falls below expected levels or if Boeing has difficulties retaining the personnel servicing our network development, the development of new products and services could be compromised. In addition, if Boeing terminates its agreement with us, we may not be able to find a replacement provider on favorable terms or at all, which could impair our operations and performance.

We have been and may in the future become subject to claims that our devices or services violate the patent or intellectual property rights of others, which could be costly and disruptive to us.

We operate in an industry that is susceptible to significant intellectual property litigation. As a result, we or our devices or services may become subject to intellectual property infringement claims or litigation. The defense of intellectual property suits is both costly and time-consuming, even if ultimately successful, and may divert management’s attention from other business concerns. An adverse determination in litigation to which we may become a party could, among other things:

• subject us to significant liabilities to third parties, including treble damages;

• require disputed rights to be licensed from a third party for royalties that may be substantial;

• require us to cease using technology that is important to our business; or

• prohibit us from selling some or all of our devices or offering some or all of our services.

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Conducting and expanding our operations outside the United States creates numerous risks, which may harm our operations and compromise our ability to expand our international operations.

We have significant operations outside the United States. We estimate that commercial data traffic originating outside the United States, excluding our Iridium OpenPort broadband data service traffic, accounted for72% and75% of total commercial data traffic for the years ended December 31, 2018 and 2017, respectively, while commercial voice traffic originating outside the United States, excluding Iridium OpenPort traffic, accounted for90% and88% of total commercial voice traffic for the years ended December 31, 2018 and 2017, respectively. We cannot provide the precise geographical distribution of revenue from end users because we do not contract directly with them. Instead, we determine the country in which we earn our revenue based on where we invoice our distributors. These distributors sell services directly or indirectly to end users, who may be located or use our products and services elsewhere. We and our distributors are also seeking authorization to sell our services in additional countries.

Conducting operations outside the United States involves numerous risks and, while expanding our international operations would advance our growth, it would also increase our exposure to these risks. For example, in 2013 we commenced the provision of satellite communications services in Russia through a local subsidiary and its authorized Russian service providers and subsequently constructed a dedicated gateway in Russia. The U.S. government has imposed economic and diplomatic sanctions on certain Russian corporations, banks, and citizens and might impose additional sanctions in the future. If such sanctions, or any Russian response to such sanctions, affects our operations in Russia, it could limit our growth in Russia or prevent us from continuing to operate there at all, which would reduce our revenues.

Other risks associated with the proposed expansion of our international operations include:

• difficulties in penetrating new markets due to established and entrenched competitors;

• difficulties in developing products and services that are tailored to the needs of local customers;

• lack of local acceptance or knowledge of our products and services;

• lack of recognition of our products and services;

• unavailability of, or difficulties in establishing, relationships with distributors;

• significant investments, including the development and deployment of dedicated gateways, as some countries require physical gateways within their jurisdiction to connect the traffic coming to and from their territory;

• instability of international economies and governments;

• changes in laws and policies affecting trade and investment in other jurisdictions, including the United Kingdom’s proposed exit from the European Union;

• exposure to varying legal standards, including data privacy, security and intellectual property protection in other jurisdictions;

• difficulties in obtaining required regulatory authorizations;

• difficulties in enforcing legal rights in other jurisdictions;

• local domestic ownership requirements;

• requirements that operational activities be performed in-country;

• changing and conflicting national and local regulatory requirements;

• foreign currency exchange rates and exchange controls; and

• ongoing compliance with the U.S. Foreign Corrupt Practices Act, U.S. export controls, anti-money laundering and trade sanction laws, and similar anti-corruption and international trade laws in other countries.

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If any of these risks were to materialize, it could affect our ability to successfully compete and expand internationally.

Government organizations, foreign military and intelligence agencies, natural disaster aid associations, and event-driven response agencies use our commercial voice and data satellite communications services. Accordingly, we may experience reductions in usage due to changing global circumstances.

The prices for our products and services are typically denominated in U.S. dollars. Any appreciation of the U.S. dollar against other currencies will increase the cost of our products and services to our international customers and, as a result, may reduce the competitiveness of our international offerings and make it more difficult for us to grow internationally. Conversely, in some locations, primarily Russia, we conduct business in the local currency, and a depreciation of the local currency against the U.S. dollar will reduce the U.S. dollar value of our revenues from those countries. In recent years, Russia has experienced significant currency depreciation against the U.S. dollar.

We may be unable to offer one or more services in important regions of the world due to regulatory requirements, which could limit our growth.

While our constellation is capable of providing service globally, our ability to sell one or more types of service in some regions may be limited by local regulations. Some countries have specific regulatory requirements such as local domestic ownership requirements or requirements for physical gateways within their jurisdiction to connect traffic coming to and from their territory. In some countries, we may not be able to find an acceptable local partner or reach an agreement to develop additional gateways, or the cost of developing and deploying such gateways may be prohibitive, which could impair our ability to expand our product and service offerings in such areas and undermine our value for potential users who require service in these areas. Also, other countries where we already provide service may impose similar requirements in the future, which could restrict our ability to continue to sell service in those countries. The inability to offer to sell our products and services in all major international markets could impair our international growth. In addition, the construction of such gateways in foreign countries may trigger and require us to comply with various U.S. regulatory requirements that could conflict with or contravene the laws or regulations of the local jurisdiction. Any of these developments could limit, delay or otherwise interfere with our ability to construct gateways or other infrastructure or network solutions around the world.

We may be unable to obtain and maintain contractually required liability insurance, and the insurance we obtain may not cover all liabilities to which we may become subject.

Under our agreements with Motorola Solutions and the U.S. Government, we are required to maintain an in-orbit liability insurance policy with a de-orbiting endorsement. The current policy, together with the de-orbiting endorsement, covers amounts that we and other specified parties may become liable to pay for bodily injury and property damages to third parties related to processing, maintaining and operating our first-generation satellites and, in the case of the de-orbiting endorsement, a mass de-orbit of our first-generation satellites. Our current policy has a one-year term, which expires onDecember 8, 2019, and excludes coverage for all third-party damages relating to the 2009 collision of our satellite with a non-operational Russian satellite. The price, terms and availability of insurance have fluctuated significantly since we began offering commercial satellite services. The cost of obtaining insurance can vary as a result of either satellite failures or general conditions in the insurance industry. Higher premiums on insurance policies would increase our cost. In-orbit liability insurance policies on satellites may not continue to be available on commercially reasonable terms or at all. In addition to higher premiums, insurance policies may provide for higher deductibles, shorter coverage periods and additional policy exclusions. For example, our current de-orbit insurance covers only twelve months from attachment and therefore would not cover losses arising outside that timeframe. In addition, even if we continue to maintain an in-orbit liability insurance policy, the coverage may not protect us against all third-party losses, which could be material.

Our current in-orbit liability insurance policy contains, and we expect any future policies would likewise contain, specified exclusions and material change limitations customary in the industry. These exclusions may relate to, among other things, losses resulting from in-orbit collisions such as the one we experienced in 2009, acts of war, insurrection, terrorism or military action, government confiscation, strikes, riots, civil commotions, labor disturbances, sabotage, unauthorized use of the satellites, and nuclear or radioactive contamination, as well as claims directly or indirectly occasioned as a result of noise, pollution, electrical and electromagnetic interference, and interference with the use of property.

In addition to our in-orbit liability insurance policy, we are required to purchase product liability insurance to cover the potential liability of Motorola Solutions, as the successor to the manufacturer of our first-generation satellites. We may not in the future be able to renew this product liability coverage on reasonable terms and conditions, or at all. Our failure to maintain this insurance could increase our exposure to third-party damages that may be caused by any of our satellites.

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Wireless devices’ radio frequency emissions are the subject of regulation and litigation concerning their environmental effects, which includes alleged health and safety risks. As a result, we may be subject to new regulations, demand for our services may decrease, and we could face liability based on alleged health risks.

There has been adverse publicity concerning alleged health risks associated with radio frequency transmissions from portable hand-held telephones that have transmitting antennas. Lawsuits have been filed against participants in the wireless industry alleging a number of adverse health consequences, including cancer, as a result of wireless phone usage. Other claims allege consumer harm from failures to disclose information about radio frequency emissions or aspects of the regulatory regimes governing those emissions. Although we have not been party to any such lawsuits, we may be exposed to such litigation in the future. While we comply with applicable standards for radio frequency emissions and power and do not believe that there is valid scientific evidence that use of our devices poses a health risk, courts or governmental agencies could determine otherwise. Any such finding could reduce our revenue and profitability and expose us and other communications service providers or device sellers to litigation, which, even if frivolous or unsuccessful, could be costly to defend.

If consumers’ health concerns over radio frequency emissions increase, they may be discouraged from using wireless handsets. Further, government authorities might increase regulation of wireless handsets as a result of these health concerns. Any actual or perceived risk from radio frequency emissions could reduce the number of our subscribers and demand for our products and services.

Our business is subject to extensive government regulation, which mandates how we may operate our business and may increase our cost of providing services and slow our expansion into new markets.

Our ownership and operation of a satellite communications system and the sale of products that operate on that system are subject to significant regulation in the United States, including by the FCC, the U.S. Department of Commerce and others, and in foreign jurisdictions by similar local authorities. The rules and regulations of these U.S. and foreign authorities may change, and such authorities may adopt regulations that limit or restrict our operations as presently conducted or currently contemplated. Such authorities may also make changes in the licenses of our competitors that affect our spectrum. Such changes may significantly affect our business. Further, because regulations in each country are different, we may not be aware if some of our distribution partners or persons with whom we or they do business do not hold the requisite licenses and approvals. Our failure to provide services in accordance with the terms of our licenses or our failure to operate our satellites or ground stations as required by our licenses and applicable laws and government regulations could result in the imposition of government sanctions on us, including the suspension or cancellation of our licenses. Our failure or delay in obtaining the approvals required to operate in other countries would limit or delay our ability to expand our operations into those countries. Our failure to obtain industry-standard or government-required certifications for our products could compromise our ability to generate revenue and conduct our business in other countries. Any imposition of sanctions, loss of license or failure to obtain the authorizations necessary to use our assigned radio frequency spectrum and to distribute our products in the United States or foreign jurisdictions could cause us to lose sales, hurt our reputation and impair our ability to pursue our business plan.

In addition, one of our subsidiaries, Iridium Carrier Services LLC, holds a common carrier radio license and is thus subject to regulation as a common carrier, including limitations and prior approval requirements with respect to direct or indirect foreign ownership. A change in the manner in which we provide service, or a failure to comply with any common carrier regulations that apply to us or to pay required fees, could result in sanctions including fines, loss of authorizations, or the denial of applications for new authorizations or the renewal of existing authorizations.

Security and emergency services regulations in the U.S. and other countries may affect our ability to operate our system and to expand into new markets.

Our operations are subject to regulations of the U.S. Department of Commerce’s Bureau of Industry and Security relating to the export of satellites and related technical data as well as our subscriber equipment, the U.S. Treasury Department’s Office of Foreign Assets Control relating to transactions involving entities sanctioned by the United States, and the U.S. State Department’s Office of Defense Trade Controls relating to satellite launch. We are also required to provide U.S. and some foreign government law enforcement and security agencies with call interception services and related government assistance, in respect of which we face legal obligations and restrictions in various jurisdictions. Given our global operations and unique network architecture, these requirements and restrictions are not always easy to comply with or harmonize. In addition, some countries require providers of telecommunications services to connect specified emergency numbers to local emergency services. We have discussed and continue to discuss with authorities in various countries the procedures used to satisfy our obligations, and have had to, and may in the future need to, obtain amendments or waivers to licenses or obligations in various countries. Countries are not obligated to grant requested amendments or waivers, and there can be no assurance that relevant

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authorities will not suspend or revoke our licenses or take other legal actions to attempt to enforce the requirements of their respective jurisdictions.

These U.S. and foreign obligations and regulations may limit or delay our ability to offer products and services in a particular country. As new laws and regulations are issued, we may be required to modify our business plans or operations. In addition, changing and conflicting national and local regulatory requirements may cause us to be in compliance with local requirements in one country, while not being in compliance with the laws and regulations of another. If we fail to comply with regulations in the United States or any other country, we could be subject to substantial fines or sanctions that could make it difficult or impossible for us to operate in the United States or such other country, or we may need to make substantial additional expenditures to bring our systems, products and services into compliance with the requirements.

If the FCC revokes, modifies or fails to renew our licenses, or fails to grant a new license or modification, our ability to operate will be harmed or eliminated.

We hold FCC licenses, specifically a license for our first-generation satellite constellation, a license for the Iridium NEXT constellation, licenses for our U.S. gateway and other ground facilities, and blanket earth station licenses for U.S. government customers and commercial subscribers, that are subject to revocation if we fail to satisfy specified conditions. The FCC licenses are also subject to modification by the FCC. Our first-generation satellite constellation license from the FCC has been extended until July 31, 2019. Our Iridium NEXT license expires on February 23, 2032. Our U.S. gateway earth station and the U.S. government customer and commercial subscriber earth station licenses expire between October 2021 and 2026. There can be no assurance that the FCC will renew the FCC licenses we hold or grant new ones or modifications. If the FCC revokes, modifies or fails to renew the FCC licenses we hold, or fails to grant a new license or modification, or if we fail to satisfy any of the conditions of our respective FCC licenses, we may not be able to continue to provide mobile satellite communications services.

Our ability to use our net operating loss carryforwards to offset future taxable income may be subject to certain limitations.

Our ability to utilize U.S. net operating loss carryforwards and other tax attributes may be limited if we experience an “ownership change” under Section 382 of the Internal Revenue Code of 1986, as amended, or the Code, which generally occurs if one or more stockholders or groups of stockholders who own at least 5% of our common stock increase their ownership in the aggregate by more than 50% over their lowest ownership percentage within a rolling period that begins on the later of three years prior to the testing date and the date of the last ownership change. Similar rules may apply under state tax laws. If an “ownership change” were to occur, Section 382 of the Code would impose an annual limit on the amount of pre-ownership change net operating loss carryforwards and other tax attributes we could use to reduce our taxable income. It is possible that such an ownership change could materially reduce our ability to use our net operating loss carryforwards or other tax attributes to offset taxable income, which could impact our profitability.

We could be subject to adverse determinations by taxing authorities or changes to tax laws.

We are subject to regular review and audit by both domestic and foreign tax authorities. As a result, we have received, and may in the future receive, assessments in multiple jurisdictions on various tax-related assertions, including transfer pricing adjustments or permanent establishment. Any adverse outcome of such a review or audit could have a negative effect on our operating results and financial condition. In addition, the determination of our provision for income taxes and other tax liabilities requires significant judgment, including transactions and calculations where the ultimate tax determination is uncertain. Although we believe our estimates are reasonable, the ultimate tax outcome may differ from the amounts recorded in our financial statements and may materially affect our financial results in the period or periods for which such determination is made. Furthermore, tax policies, laws or rates in various jurisdictions may be subject to significant change, which could materially and adversely affect our financial position and results of operations.

Changes in tax laws could increase our worldwide tax rate and materially affect our financial position and results of operations.

The Tax Cuts and Jobs Act, or the Tax Act, enacted in December 2017, resulted in significant changes to the Internal Revenue Code, including, among other things, significantly reducing the statutory corporate U.S. federal income tax rate, imposing limitations on the ability to deduct interest expense and net operating losses and making changes to the way a U.S. multinational company’s foreign operations are taxed, including a one-time mandatory tax on deferred foreign earnings and the imposition of the “base erosion anti-abuse tax.” The Securities and Exchange Commission issued Staff Accounting Bulletin No. 118, or SAB 118, to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Tax Act. SAB 118 was effective for reporting periods that include December 22, 2017. Due to

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the timing of the enactment and the complexity involved in applying the provisions of the Tax Act, we made reasonable estimates of the anticipated effects of the Tax Act and recorded provisional amounts in our December 31, 2017 financial statements. In the fourth quarter of 2018, we completed our accounting for the income tax effects of the Tax Act. No material adjustments were required to the provisional amounts initially recorded. If any additional guidance is issued by the IRS or other standard-setting bodies with respect to the Tax Act, we may need to make adjustments to our prior estimates, which could materially affect our financial statements in the period in which the adjustments are made.

In addition, many U.S. states and foreign countries have adopted or proposed changes to current tax laws. Further, organizations such as the Organization for Economic Cooperation and Development have published action plans that, if adopted by countries where we do business, could increase our tax obligations in these countries. Due to our U.S. and international business activities, certain of these enacted and proposed changes to the taxation of our activities could increase our worldwide effective tax rate, which in turn could harm our financial position and results of operations.

Pursuing strategic transactions may cause us to incur additional risks.

We may pursue acquisitions, joint ventures or other strategic transactions from time to time, such as the Boeing insourcing transaction. We may face costs and risks arising from any such transactions, including integrating a new business into our business or managing a joint venture. These risks may include adverse legal, organizational and financial consequences, loss of key customers and distributors and diversion of management’s time.

In addition, any major business combination or similar strategic transaction would require approval under the Credit Facility and may require significant additional financing. Depending on market conditions, investor perceptions of our company and other factors, we might not be able to obtain approvals under the Credit Facility or financing on acceptable terms, in acceptable amounts or at appropriate times to implement any such transaction. Any such financing, if obtained, may further dilute existing stockholders.

Spectrum values historically have been volatile, which could cause the value of our business to fluctuate.

Our business plan is evolving, and it may in the future include forming strategic partnerships to maximize value for our spectrum, network assets and combined service offerings in the United States and internationally. Values that we may be able to realize from such partnerships will depend in part on the value placed on our spectrum authorizations. Valuations of spectrum in other frequency bands historically have been volatile, and we cannot predict at what amount a future partner may be willing to value our spectrum and other assets. In addition, to the extent that the FCC takes action that makes additional spectrum available or promotes the more flexible use or greater availability of existing satellite or terrestrial spectrum allocations, for example by means of spectrum leasing or new spectrum sales, the availability of such additional spectrum could reduce the value of our spectrum authorizations and, as a result, the value of our business.

We may be negatively affected by global economic conditions.

Our operations and performance depend significantly on worldwide economic conditions. Uncertainty about global economic conditions poses a risk as individual consumers, businesses and governments may postpone spending in response to tighter credit, negative financial news, declines in income or asset values, or budgetary constraints. Reduced demand would cause a decline in our revenue and make it more difficult for us to operate profitably, potentially compromising our ability to pursue our business plan. While we expect the number of our subscribers and revenue to continue to grow, we expect the future growth rate will be slower than our historical growth and may not continue in every quarter of every year. We expect our future growth rate will be affected by the condition of the global economy, increased competition, maturation of the satellite communications industry, and the difficulty in sustaining high growth rates as we increase in size. Any substantial appreciation of the U.S. dollar may also negatively affect our growth by increasing the cost of our products and services in foreign countries.

If we fail to maintain proper and effective internal controls, our ability to produce accurate financial statements on a timely basis could be impaired.

We are subject to the reporting requirements of the Securities Exchange Act of 1934, the Sarbanes-Oxley Act of 2002, the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010, and the rules and regulations of the SEC and The Nasdaq Global Select Market. The Sarbanes-Oxley Act requires, among other things, that we maintain effective disclosure controls and procedures and internal controls over financial reporting. We perform system and process evaluation and testing of our internal controls over financial reporting to allow management to report on the effectiveness of our internal controls over financial reporting in our Annual Reports on Form 10-K, as required by Section 404 of the Sarbanes-Oxley Act. If we are not able to comply with the requirements of Section 404 of the Sarbanes-Oxley Act in a timely manner, or if we are unable to

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maintain proper and effective internal controls, we may not be able to produce timely and accurate financial statements, and we may conclude that our internal controls over financial reporting are not effective. If that were to happen, the market price of our stock could decline, and we could be subject to sanctions or investigations by the Nasdaq Global Select Market, the SEC or other regulatory authorities.

Maintaining effective internal controls over financial reporting is necessary for us to produce reliable financial statements. If we fail to maintain such controls, it could result in a material misstatement of our financial statements that would not be prevented or detected on a timely basis and which could cause investors and other users to lose confidence in our financial statements.

Our ability to operate our company effectively could be impaired if we lose members of our senior management team or key technical personnel.

We depend on the continued service of key managerial and technical personnel and personnel with security clearances, as well as our ability to continue to attract and retain highly qualified personnel. We compete for such personnel with other companies, government entities, academic institutions and other organizations. The unexpected loss or interruption of the services of such personnel could compromise our ability to effectively manage our operations, execute our business plan and meet our strategic objectives.

The market price of our common stock may be volatile.

The trading price of our common stock may be subject to substantial fluctuations. Factors affecting the trading price of our common stock may include:

• failure in the performance of our satellites;

• failure of Aireon to successfully market its service;

• failure to comply with the terms of the Credit Facility or the indenture for the Notes;

• actual or anticipated variations in our operating results, including termination or expiration of one or more of our key contracts, or a change in sales levels under one or more of our key contracts;

• sales of a large number of shares of our common stock or the perception that such sales may occur;

• the dilutive effect of outstanding stock options and other equity awards;

• changes in financial estimates by industry analysts, or our failure to meet or exceed any such estimates, or changes in the recommendations of any industry analysts that elect to follow our common stock or the common stock of our competitors;

• impairment of intangible assets;

• actual or anticipated changes in economic, political or market conditions, such as recessions or international currency fluctuations;

• actual or anticipated changes in the regulatory environment affecting our industry;

• changes in the market valuations of our competitors;

• low trading volume; and

• announcements by our competitors regarding significant new products or services or significant acquisitions, strategic partnerships, divestitures, joint ventures or other strategic initiatives.

The trading price of our common stock might also decline in reaction to events that affect other companies in our industry even if these events do not directly affect us. If our stock, the market for other stocks in our industry, or the stock market in general experiences a loss of investor confidence, the trading price of our common stock could decline for reasons unrelated to our business, financial condition or results of operations.

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We do not expect to pay dividends on our common stock in the foreseeable future.

We do not currently pay cash dividends on our common stock and, because we currently intend to retain all cash we generate to fund the growth of our business and the Credit Facility restricts the payment of dividends, we do not expect to pay dividends on our common stock in the foreseeable future.

Our common stock ranks junior to our Series B Preferred Stock with respect to dividends and amounts payable in the event of our liquidation.

Our common stock ranks junior to our Series B Preferred Stock with respect to the payment of dividends and amounts payable in the event of our liquidation, dissolution or winding-up. This means that, unless accumulated dividends have been paid or set aside for payment on all outstanding shares of Series B Preferred Stock for all past completed dividend periods, no dividends may be declared or paid on our common stock. Likewise, in the event of our voluntary or involuntary liquidation, dissolution or winding-up, no distribution of our assets may be made to holders of our common stock until we have paid to holders of the Series B Preferred Stock the applicable liquidation preference plus accrued and unpaid dividends, and we have currently suspended the payment of dividends on our Series B Preferred Stock in accordance with the terms of our amended and restated Credit Facility. See "Management's Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources" for additional details. As a result, the value of your investment in our common stock may suffer in the event that sufficient funds are not available to first satisfy our obligations to the holders of our preferred stock in the event of our liquidation.

Item 1B. Unresolved Staff Comments

None.

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Item 2. Properties

We own or lease the facilities described in the following table: 

Location	Country	Approximate Square Feet	Facilities	Owned/Leased
McLean, Virginia	USA	30,600	Corporate Headquarters	Leased
Chandler, Arizona	USA	197,000	Technical Support Center, Distribution Center, Warehouse and Satellite Teleport Network Facility	Leased
Leesburg, Virginia	USA	40,000	Satellite Network Operations Center	Owned
Lansdowne, Virginia	USA	1,884	Satellite Network Operations Center - Annex	Leased
Tempe, Arizona	USA	31,000	System Gateway and Satellite Teleport Network Facility	Owned Building on Leased Land
Tempe, Arizona	USA	25,000	Operations and Finance Office Space	Leased
Fairbanks, Alaska	USA	4,000	Satellite Teleport Network Facility	Owned
Svalbard	Norway	1,800	Satellite Teleport Network Facility	Owned Building on Leased Land
Yellowknife, Northwest Territories	Canada	1,800	Satellite Teleport Network Facility	Owned Building on Leased Land
Iqaluit, Nunavut	Canada	1,800	Satellite Teleport Network Facility	Owned Building on Leased Land
Izhevsk, Udmurtia	Russia	8,785	System Gateway and Satellite Teleport Network Facility	Leased
Moscow	Russia	2,158	Sales and Administration Offices	Leased
Punta Arenas	Chile	3,200	Satellite Teleport Network Facility	Owned Building on Leased Land

Item 3. Legal Proceedings

Neither we nor any of our subsidiaries are currently subject to any material legal proceeding, nor, to our knowledge, is any material legal proceeding threatened against us or any of our subsidiaries.

Item 4. Mine Safety Disclosures

Not applicable.

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PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Our common stock is currently listed on the NASDAQ Global Select Market under the symbol “IRDM.” As of February 22, 2019 there were 108 holders of record of our common stock.

Dividend Policy

We have not paid any dividends on our common stock to date. The Credit Facility currently prohibits us from declaring, making or paying dividends on our common stock.

Stock Price Performance Graph

The graph below compares the cumulative total return of our common stock from December 31, 2013 through December 31, 2018 with the comparable cumulative return of three indices, the S&P 500 Index, the Dow Jones Industrial Average Index and the NASDAQ Telecommunications Index. The graph plots the growth in value of an initial investment of$100 in each of our common stock, the S&P 500 Index, the Dow Jones Industrial Average Index and the NASDAQ Telecommunications Index over the indicated time periods. The stock price performance shown on the graph is not necessarily indicative of future price performance. The following stock price performance graph shall not be deemed to be "filed" for purposes of Section 18 of the Exchange Act, nor shall this information be incorporated by reference into any future filing under the Securities Act or the Exchange Act or any other document, except to the extent that we specifically incorporate it by reference into such filing or document.

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Item 6. Selected Financial Data

Iridium Communications Inc.

The following selected historical financial data as of and for the years ended December 31, 2018, 2017, 2016, 2015 and 2014 was derived from our audited financial statements. The selected financial data below should be read in conjunction with our financial statements and related notes, and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included elsewhere in this Form 10-K. The selected financial data is historical data and is not necessarily indicative of our future results of operations.

	For the Year Ended December 31,
Statement of Operations Data	2018			2017		2016		2015			2014
	(In thousands, except per share amounts)
Revenue:
Services	$	406,757		$	349,735	$	334,822	$	317,022		$	309,424
Subscriber equipment	97,848			77,119		74,211		73,615			78,152
Engineering and support services	18,403			21,192		24,607		20,741			20,981
Total revenue	$	523,008		$	448,046	$	433,640	$	411,378		$	408,557
Total operating expenses (1)	$	481,355		$	346,759	$	257,269	$	337,575		$	285,646
Operating income (2)	$	41,653		$	115,476	$	176,371	$	73,803		$	122,911
Net income (loss) (3)	$	(13,384	)	$	233,856	$	111,032	$	7,123		$	74,989
Comprehensive income	$	(18,385	)	$	235,506	$	114,649	$	980		$	72,758
Weighted average shares outstanding - basic	108,975			97,934		95,967		95,097			88,080
Weighted average shares outstanding - diluted	108,975			128,130		124,875		95,097			109,400
Net income (loss) per share - basic	$	(0.22	)	$	2.23	$	1.00	$	(0.09	)	$	0.71
Net income (loss) per share - diluted	$	(0.22	)	$	1.82	$	0.89	$	(0.09	)	$	0.69

	As of December 31,
Balance Sheet Data	2018		2017		2016		2015		2014
	(In thousands)
Total current assets	$	390,384	$	411,072	$	516,770	$	481,718	$	573,113
Total assets (1)(3)	$	4,014,271	$	3,782,051	$	3,499,625	$	3,071,174	$	2,773,237
Total long-term liabilities (3)	$	2,149,975	$	1,971,356	$	2,072,673	$	1,740,839	$	1,439,023
Total stockholders' equity	$	1,601,577	$	1,596,469	$	1,343,758	$	1,228,721	$	1,231,864

⁽¹⁾ Includes accelerated depreciation of$36.8 million in the fourth quarter of 2017 associated with the write-off of amounts previously paid to Kosmotras and a goodwill impairment charge of$87.0 million in the fourth quarter of 2015, both of which decreased operating income and total assets by those amounts.

⁽²⁾  Includes the impact of$14.2 million related to the gain on the transaction with Boeing, effective January 3, 2017.

⁽³⁾ Includes the impact of the Tax Act enacted in December 2017 on our deferred tax assets and liabilities.

	For the Year Ended December 31,
Other Cash Flow Data	2018			2017			2016			2015			2014
	(In thousands)
Cash provided by (used in):
Operating activities	$	263,709		$	259,621		$	225,199		$	217,479		$	214,872
Investing activities	$	(378,912	)	$	(372,680	)	$	(242,360	)	$	(439,374	)	$	(626,254	)
Financing activities	$	193,503		$	16,866		$	224,178		$	202,075		$	443,724

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Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Background

We were initially formed in 2007 as GHL Acquisition Corp., a special purpose acquisition company. In 2009, we acquired all the outstanding equity in Iridium Holdings LLC and changed our name to Iridium Communications Inc.

Overview of Our Business

We are engaged primarily in providing mobile voice and data communications services using a constellation of orbiting satellites. We are the only commercial provider of communications services offering true global coverage, connecting people, organizations and assets to and from anywhere, in real time. Our unique L-band satellite network provides reliable communications services to regions of the world where terrestrial wireless or wireline networks do not exist or are limited, including remote land areas, open ocean, airways, the polar regions and regions where the telecommunications infrastructure has been affected by political conflicts or natural disasters.

We provide voice and data communications services to businesses, the U.S. and foreign governments, non-governmental organizations and consumers via our recently completed Iridium NEXT satellite network, which has an architecture of 66 operational satellites with in-orbit and ground spares and related ground infrastructure. We utilize an interlinked mesh architecture to route traffic across the satellite constellation using radio frequency crosslinks between satellites. This unique architecture minimizes the need for ground facilities to support the constellation, which facilitates the global reach of our services and allows us to offer services in countries and regions where we have no physical presence. Iridium NEXT is compatible with all of our end-user equipment and supports more bandwidth and higher data speeds for our new products, including our recently introduced Iridium Certusbroadband product.

We sell our products and services to commercial end users through a wholesale distribution network, encompassing approximately130 service providers,230 value-added resellers, or VARs, and90 value-added manufacturers, or VAMs, who either sell directly to the end user or indirectly through other service providers, VARs or dealers. These distributors often integrate our products and services with other complementary hardware and software and have developed a broad suite of applications for our products and services targeting specific lines of business.

At December 31, 2018, we had approximately1,121,000 billable subscribers worldwide, an increase of152,000, or16%, from approximately969,000 billable subscribers at December 31, 2017. We have a diverse customer base, including end users in land-mobile, Internet of Things, or IoT, maritime, aviation and government.

We recognize revenue from both the provision of services and the sale of equipment. Service revenue represented78% of total revenue for each of the years ended December 31, 2018 and 2017. Voice and data and IoT data service revenues have historically generated higher margins than subscriber equipment revenue and we expect this trend to continue. We also recognize revenue from our hosted payloads, principally Aireon, including fees for hosting the payloads and fees for transmitting data from the payloads over our network, as well as revenue from other services, such as satellite time and location services.

Iridium NEXT Services Agreements

We recently completed the full replacement of our first-generation satellites with our Iridium NEXT constellation at a cost of approximately$3 billion. While our Iridium NEXT constellation is fully operational, some of the payments associated with the construction and launch of the satellites will extend into the second quarter of 2019, including the cost of the final ground spares.

In June 2010, we executed a primarily fixed price full scale development contract, or FSD, with Thales Alenia Space for the design and manufacture of satellites for Iridium NEXT. The total price under the FSD is approximately$2.3 billion, and we expect our payment obligations under the FSD to extend into 2019. As of December 31, 2018, we had made total payments of$2.2 billion to Thales Alenia Space, which are classified within property and equipment, net, in our consolidated balance sheet included in this report, of which$1.5 billion were from borrowings under the Credit Facility. We expect to pay the remaining invoices received from Thales Alenia Space from cash and cash equivalents on hand, as well as internally generated cash flows.

In March 2010, we entered into an agreement with Space Exploration Technologies Corp., or SpaceX, as the primary launch services provider for Iridium NEXT. The contract price under the SpaceX agreement is$448.9 million. In November 2016, we entered into an additional agreement with SpaceX for an eighth Falcon 9 launch for a contract price of$61.9 million. Although

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we are the customer of record with SpaceX, we contracted separately with GFZ for$29.8 million to share the launch. As of December 31, 2018, we had made aggregate payments of$498.9 million to SpaceX, and we had received the full$29.8 million from GFZ. We expect to pay the remaining invoices received from SpaceX in the first quarter of 2019 from cash and cash equivalents on hand, as well as internally generated cash flows.

Credit Facility

In October 2010, we entered into a credit facility with a syndicate of bank lenders, which we amended and restated on March 9, 2018. We refer to this amended and restated credit facility, as further amended to date, as the Credit Facility. Ninety-five percent of our obligations under the Credit Facility are insured by BPIAE. The Credit Facility consists of two tranches, with draws and repayments applied pro rata in respect of each tranche:

• Tranche A –$1,537,500,000 at a fixed rate of4.96%; and

• Tranche B –$262,500,000 at a floating rate equal to LIBOR, plus1.95%.

The amendment and restatement of the Credit Facility in 2018 (i) allowed us to issue$360.0 million in senior unsecured notes, or the Notes, (ii) delayed a portion of the principal repayments scheduled under the Credit Facility for 2018, 2019 and 2020 into 2023 and 2024 pursuant to an amended repayment installment schedule, (iii) allows us to access up to$87.0 million from the debt service reserve account, or DSRA, in the future if our projected cash level falls below$75.0 million, and (iv) adjusted our financial covenants, including eliminating covenants that required us to receive cash flows from hosted payloads and adding a covenant that requires us to receive$200.0 million in hosting fees from Aireon LLC, our primary hosted payload customer, by December 2023. In the event that (a) our cash balance exceeds$140.0 million after September 30, 2019 (subject to specified exceptions) or (b) we receive hosting fees from Aireon, we would be required pursuant to the Credit Facility to use50% of such excess cash and up to$200.0 million of hosting fees to prepay the Credit Facility. In addition, if any of the Notes remain outstanding on October 15, 2022, which is six months prior to the scheduled maturity thereof, the maturity of all amounts remaining outstanding under the Credit Facility would be accelerated from September 30, 2024 to October 15, 2022. Lender fees incurred related to the amended and restated Credit Facility were$10.3 million, which were capitalized as deferred financing costs and are being amortized over the remaining term of the Credit Facility.

For the year ended December 31, 2018, using hosting fees received from Aireon, we extinguished principal under the Credit Facility of$43.1 million, which resulted in a$3.3 million loss on extinguishment of debt recorded within interest expense, representing premiums paid for early prepayment and the write-off of unamortized debt issuance costs. There were no prepayments or related interest expense during the year ended December 31, 2017.

We began making scheduled semi-annual principal repayments in 2018, with such payments scheduled to be paid each March 30 and September 30. The Credit Facility will mature September 30, 2024. During the repayment period, we will pay interest in cash on the same date as the principal repayments. Prior to 2018, we made interest-only payments on a semi-annual basis in April and October.

We may prepay the borrowings subject to the payment of interest makeup costs. We may not subsequently borrow any amounts that we repay. We must repay the loans in full upon a delisting of our common stock, a change in control of our company or our ceasing to own 100% of any of the other obligors, or the sale of all or substantially all of our assets. We must apply all or a portion of specified capital raise proceeds, insurance proceeds, condemnation proceeds, proceeds from the disposal of any interests in Aireon and 100% of any hosting fees received from Aireon to the prepayment of the loans. The Credit Facility includes customary representations and events of default.

Under the terms of the Credit Facility, we are required to maintain a DSRA, and the minimum amount required to be in the DSRA was$189.0 million as of December 31, 2018, which is classified as restricted cash and cash equivalents on our consolidated balance sheet.

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In addition to the minimum debt service reserve levels, financial covenants under the Credit Facility include:

• an available cash balance of at least$25 million;

• a debt-to-equity ratio, which is calculated as the ratio of total net debt to the aggregate of total net debt and total stockholders’ equity, of no more than0.7 to 1, measured each June 30 and December 31;

• specified maximum levels of annual capital expenditures (excluding expenditures on the construction of Iridium NEXT satellites) through the year ending December 31, 2024;

• a debt service coverage ratio of not less than1.5 to 1, measured each June 30 and December 31 through the year ending December 31, 2020, not less than1.25 to 1 for June 30 and December 31, 2021, and not less than1.5 to 1, for each June 30 and December 31 thereafter through 2024;

• specified maximum leverage levels that decline from a ratio of8.24 to 1 for the year ended December 31, 2018 to a ratio of2.00 to 1 for the year ending December 31, 2024; and

• a requirement that we receive at least$200.0 million in hosting fees from Aireon by December 31, 2023.

Our available cash balance, as defined by the Credit Facility, was$273.4 million as of December 31, 2018. Our debt-to-equity ratio was0.53 to 1 as of December 31, 2018. Our debt service coverage ratio was3.4 to 1 as of December 31, 2018, and our leverage was5.9 to 1 for the year ended December 31, 2018. We were also in compliance with the annual capital expenditures covenant as of December 31, 2018.

The covenant regarding capital expenditures is calculated in connection with a measurement, which we refer to as available cure amount, that is derived using a complex calculation based on overall cash flows, as adjusted by numerous measures specified in the Credit Facility. In a period in which our capital expenditures exceed the amount specified in the respective covenant, we would be permitted to allocate available cure amount, if any, to prevent a breach of the applicable covenant. As of December 31, 2018, we had an available cure amount of$62.5 million, although it was not necessary for us to apply any available cure amount to maintain compliance with the covenants. The available cure amount has fluctuated significantly from one measurement period to the next, and we expect that it will continue to do so. 

The covenants also place limitations on our ability and that of our subsidiaries to carry out mergers and acquisitions, dispose of assets, grant security interests, declare, make or pay dividends, enter into transactions with affiliates, incur additional indebtedness, or make loans, guarantees or indemnities. If we are not in compliance with the financial covenants under the Credit Facility, after any opportunity to cure such non-compliance, or we otherwise experience an event of default under the Credit Facility, the lenders may require repayment in full of all principal and interest outstanding under the Credit Facility. It is unlikely we would have adequate funds to repay such amounts prior to the scheduled maturity of the Credit Facility. If we fail to repay such amounts, the lenders may foreclose on the assets we have pledged under the Credit Facility, which include substantially all of our assets and those of our domestic subsidiaries.

Senior Unsecured Notes

On March 21, 2018, we issued$360.0 million in aggregate principal under the Notes, before$9.0 million of deferred financing costs, for a net principal balance of$351.0 million in borrowings from the Notes. The Notes bear interest at10.25% per annum and mature on April 15, 2023. We began paying interest in 2018, with such interest payments scheduled semi-annually on April 15 and October 15. Any outstanding principal amounts will be due in full upon maturity. If any of the Notes remain outstanding on October 15, 2022, which is six months prior to their scheduled maturity, the maturity of all amounts remaining outstanding under the Credit Facility would also be accelerated from September 30, 2024 to October 15, 2022. As such, we expect that we will make full principal repayment of the Notes on or before October 15, 2022.

The proceeds of the Notes were used to prepay the outstanding Thales Alenia Space bills of exchange, including premiums paid, of approximately$59.9 million issued pursuant to the Thales Alenia Space FSD, replenish the DSRA under the Credit Facility to$189.0 million and to pay approximately$44.4 million in Thales Alenia Space milestones previously expected to be satisfied by the issuance of bills of exchange. The proceeds of the Notes also provide us with cash that we expect to use to make principal and interest payments under our Credit Facility and to pay interest on the Notes. The Notes contain covenant requirements that apply to certain permitted financing actions by us, but the covenants under the Notes are no more restrictive than the covenants included in the Credit Facility and described above. We were in compliance with all covenants under the Notes as of December 31, 2018.

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Interest Incurred on Debt

Total interest incurred during the years ended December 31, 2018, 2017 and 2016 was$142.7 million,$114.4 million and$106.4 million, respectively. Interest incurred includes amortization of deferred financing fees of$26.5 million,$27.3 million and$28.7 million, for the years ended December 31, 2018, 2017 and 2016, respectively. Interest capitalized during the year ended December 31, 2018 was$76.7 million. During 2017 and 2016, all interest was capitalized. Also during 2016, paid-in-kind interest was$44.4 million, with the remainder payable in cash on the scheduled semi-annual payment dates. Interest accrued for the years ended December 31, 2018 and 2017 was$29.4 million and$15.0 million, respectively.   

Material Trends and Uncertainties

Our industry and customer base has historically grown as a result of:

• demand for remote and reliable mobile communications services;

• a growing number of new products and services and related applications;

• a broad wholesale distribution network with access to diverse and geographically dispersed niche markets;

• increased demand for communications services by disaster and relief agencies, and emergency first responders;

• improved data transmission speeds for mobile satellite service offerings;

• regulatory mandates requiring the use of mobile satellite services;

• a general reduction in prices of mobile satellite services and subscriber equipment; and

• geographic market expansion through the ability to offer our services in additional countries.

Nonetheless, we face a number of challenges and uncertainties in operating our business, including:

• our ability to maintain the health, capacity, control and level of service of our satellites;

• our ability to develop and launch new and innovative products and services;

• our ability to generate sufficient internal cash flows to support our ongoing business and to satisfy our debt service obligations;

• changes in general economic, business and industry conditions, including the effects of currency exchange rates;

• our reliance on a single primary commercial gateway and a primary satellite network operations center;

• competition from other mobile satellite service providers and, to a lesser extent, from the expansion of terrestrial-based cellular phone systems and related pricing pressures;

• market acceptance of our products;

• regulatory requirements in existing and new geographic markets;

• rapid and significant technological changes in the telecommunications industry;

• reliance on our wholesale distribution network to market and sell our products, services and applications effectively;

• reliance on single-source suppliers for the manufacture of most of our subscriber equipment and for some of the components required in the manufacture of our end-user subscriber equipment and our ability to purchase parts that are periodically subject to shortages resulting from surges in demand, natural disasters or other events; and

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• reliance on a few significant customers, particularly agencies of the U.S. government, for a substantial portion of our revenue, as a result of which the loss or decline in business with any of these customers may negatively impact our revenue and collectability of related accounts receivable.

Critical Accounting Policies and Estimates

The discussion and analysis of our financial condition and results of operations is based upon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States, or U.S. GAAP. The preparation of these financial statements requires the use of estimates and judgments that affect the reported amounts of assets, liabilities, revenue and expenses, and related disclosure of contingent assets and liabilities. On an ongoing basis, we evaluate our estimates, including those related to revenue recognition, income taxes, useful lives of property and equipment, loss contingencies, and other estimates. We base our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances. Actual results may differ from these estimates under different assumptions or conditions.

The accounting policies we believe to be most critical to understanding our financial results and condition and that require complex and subjective management judgments are discussed below. Our accounting policies are more fully described in Note 2 in Item 8 “Financial Statements and Supplementary Data” included in this report. Please see the notes to our consolidated financial statements for a full discussion of these significant accounting policies.

Revenue Recognition

We sell services and equipment through contracts with our customers. We evaluate whether a contract exists as it relates to collectibility of the contract. Once a contract is deemed to exist, we evaluate the transaction price including both fixed and variable consideration. The variable consideration contained within our contracts with customers may include discounts, credits and other similar items. When a contract includes variable consideration, we evaluate the estimate of the variable consideration to determine whether the estimate needs to be constrained. Therefore, we include constrained consideration in the transaction price only to the extent that it is probable that a significant reversal of the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration or collectibility is subsequently resolved. Variable consideration estimates are updated at the end of each quarter and collectibility assessments are evaluated with new customers, or on an ongoing basis if initially deemed not probable, and updated as facts and circumstances change.  

We sell prepaid services in the form of e-vouchers and prepaid cards. A liability is established equal to the cash paid upon purchase for the e-voucher or prepaid card. We recognize revenue from the prepaid services upon the use of the e-voucher or prepaid card by the customer. On January 1, 2018, upon the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers, we began estimating the expected revenue that will expire unused on an ongoing basis and we recognize this revenue in a manner consistent with the usage period. While the terms of prepaid e-vouchers can be extended by the purchase of additional e-vouchers, prepaid e-vouchers may not be extended beyond three or four years, dependent on the initial expiry period when purchased. We do not offer refunds for unused prepaid services.

Revenue associated with some of our fixed-price engineering services arrangements is recognized over time using costs incurred to date relative to total estimated costs at completion to measure progress toward satisfying our performance obligation. We recognize revenue on cost-plus-fixed-fee arrangements to the extent of estimated costs incurred plus the applicable fees earned. If actual results are not consistent with our estimates or assumptions, we may be exposed to changes to earned and unearned revenue that could be material to our results of operations.

Income Taxes

We account for income taxes using the asset and liability approach. This approach requires that we recognize deferred tax assets and liabilities based on differences between the financial statement bases and tax bases of our assets and liabilities. Deferred tax assets and liabilities are recorded based upon enacted tax rates for the period in which the deferred tax items are expected to reverse. Changes in tax laws or tax rates in various jurisdictions are reflected in the period of change. Significant judgment is required in the calculation of our tax provision and the resulting tax liabilities as well as our ability to realize our deferred tax assets. Our estimates of future taxable income and any changes to such estimates can significantly affect our tax provision in a given period. Significant judgment is required in determining our ability to realize our deferred tax assets related to federal, state and foreign tax attributes within their carryforward periods including estimating the amount and timing of the future reversal of deferred tax items in our projections of future taxable income. A valuation allowance is established to reduce deferred tax assets to the amounts we expect to realize in the future. We also recognize tax benefits related to uncertain tax positions only when we estimate that it is “more likely than not” that the position will be sustainable based on its technical

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merits. If actual results are not consistent with our estimates and assumptions, this may result in material changes to our income tax provision.

The Tax Act, enacted in December 2017, introduced significant changes to U.S. income tax law that have a meaningful impact on our provision for income taxes. Due to the timing of the enactment and the complexity involved in applying the provisions of the Tax Act, we made reasonable estimates of the effects and recorded these estimates in our financial statements for the years ended December 31, 2017 and 2018. Accounting for the income tax effects of the Tax Act requires significant judgments and estimates in the interpretation and calculations of the various provisions. During 2018, the U.S. Treasury Department, as well as the Internal Revenue Service, or IRS, and other standard-setting bodies have issued some guidance related to certain provisions in the Tax Act. These same standard-setting bodies may issue additional guidance on how the provisions of the Tax Act will be applied or otherwise administered that is different from our interpretation. As we collect and prepare necessary data, interpret the Tax Act and analyze any additional guidance issued by the IRS or other standard-setting bodies, we may need to make adjustments to prior estimates, which could materially affect our financial statements in the period in which the adjustments are made.

Property and Equipment

Property and equipment are stated at cost, less accumulated depreciation and amortization. Property and equipment are depreciated or amortized over their estimated useful lives. We apply judgment in determining the useful lives based on factors such as engineering data, our long-term strategy for using the assets, contractual terms related to the assets, laws and regulations that could impact the useful lives of the assets and other economic factors. In evaluating the useful lives of our satellites, we assess the current estimated operational life of the satellites, including the potential impact of environmental factors on the satellites, ongoing operational enhancements and software upgrades. Additionally, we review engineering data relating to the operation and performance of our satellite network.

We depreciate our satellites over the shorter of their potential operational life or the period of their expected use. The appropriateness of the useful lives is evaluated on a quarterly basis or as events occur that require additional assessment. The Iridium NEXT satellites that have been placed into service are depreciated using the straight-line method over their respective estimated useful lives. If the estimated useful lives of Iridium NEXT satellites change, it could have a material impact on the timing of the recognition of depreciation expense.

During the construction period for Iridium NEXT, assets under construction primarily consisted of costs incurred associated with the design, development and launch of the Iridium NEXT satellites, upgrades to our current infrastructure and ground systems and internal software development costs. We capitalized interest on the Credit Facility during the construction period of Iridium NEXT. Capitalized interest is added to the cost of the Iridium NEXT satellites. Once these assets are placed in service, they are depreciated using the straight-line method over their respective estimated useful lives. During each year end, we evaluate the useful lives of all assets under construction. In 2017, we determined that the Kosmotras launch services would no longer be used or further developed. As such, we wrote-off the full amount previously paid to Kosmotras, by recording accelerated depreciation of$36.8 million in the fourth quarter of 2017. No such charges were recorded for the years ended December 31, 2018 or 2016.

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Comparison of Our Results of Operations for the Year Ended December 31, 2018 and the Year Ended December 31, 2017

	Year Ended December 31,
				% of Total Revenue					% of Total Revenue		Change
($ In thousands)	2018					2017					Dollars			Percent
Revenue:
Service revenue
Commercial	$	318,757		61	%	$	261,735		58	%	$	57,022		22	%
Government	88,000			17	%	88,000			20	%	—			0	%
Total service revenue	406,757			78	%	349,735			78	%	57,022			16	%
Subscriber equipment	97,848			19	%	77,119			17	%	20,729			27	%
Engineering and support services	18,403			3	%	21,192			5	%	(2,789		)	(13	)%
Total revenue	523,008			100	%	448,046			100	%	74,962			17	%
Operating expenses:
Cost of services (exclusive of depreciation
and amortization)	86,016			16	%	80,396			18	%	5,620			7	%
Cost of subscriber equipment	56,857			11	%	44,445			10	%	12,412			28	%
Research and development	22,429			4	%	15,247			3	%	7,182			47	%
Selling, general and administrative	97,846			19	%	84,405			19	%	13,441			16	%
Depreciation and amortization	218,207			42	%	122,266			27	%	95,941			78	%
Total operating expenses	481,355			92	%	346,759			77	%	134,596			39	%
Gain on Boeing transaction	—			—		14,189			3	%	(14,189		)	100	%
Operating income	41,653			8	%	115,476			26	%	(73,823		)	(64	)%
Other income (expense):
Interest income (expense), net	(62,441		)	(12	)%	4,328			1	%	(66,769		)	(1,543	)%
Other income (expense), net	139			0	%	(232		)	0	%	371			(160	)%
Total other income (expense)	(62,302		)	(12	)%	4,096			1	%	(66,398		)	(1,621	)%
Income (loss) before income taxes	(20,649		)	(4	)%	119,572			27	%	(140,221		)	(117	)%
Income tax benefit	7,265			1	%	114,284			25	%	(107,019		)	(94	)%
Net income (loss)	$	(13,384	)	(3	)%	$	233,856		52	%	$	(247,240	)	(106	)%

Commercial Service Revenue

	Year Ended December 31,
	2018					2017					Change
	Revenue		Billable Subscribers (1)	ARPU (2)		Revenue		Billable Subscribers (1)	ARPU (2)		Revenue		Billable Subscribers	ARPU
	(Revenue in millions and subscribers in thousands)
Commercial voice and data	$	193.2	361	$	45	$	177.7	359	$	42	$	15.5	2	$	3.0
Commercial IoT data	85.1		647	$	12	74.1		510	$	13	11.0		137	$	(1.0	)
Hosted payload and other data services	40.4		N/A			9.9		N/A			30.5		N/A
Total Commercial	$	318.7	1,008			$	261.7	869			$	57.0	139

⁽¹⁾  Billable subscriber numbers are shown as of the end of the respective period.

⁽²⁾  Average monthly revenue per unit, or ARPU, is calculated by dividing revenue in the respective period by the average of the number of billable subscribers at the beginning of the period and the number of billable subscribers at the end of the period and then dividing the result by the number of months in the period. Billable subscriber and ARPU data is not applicable for hosted payload and other data service revenue items.

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For the year ended December 31, 2018, total commercial revenue increased$57.0 million, or22%, due to strong revenue growth within each of our service categories. The increase was primarily due to the increase in hosted payload and other data services revenue of$30.5 million, or308%, which was attributable torevenue from hosting services related to Aireon, increased hosted payload data services due to an increase in the number of Iridium NEXT satellites in service andincreased satellite time and location service revenue. In addition, commercial voice and data revenue increased by$15.5 million, or9%, from the prior year period principally due to anincrease in average revenue per unit resulting fromcertain price increases in access fees and growth inIridium OpenPort^® subscribers. Commercial IoT data revenue increased by$11.0 million, or15%, from the prior year period primarily due to a27% increase in commercial IoT data billable subscribers, partially offset by adecline in related ARPU.

Government Service Revenue

	Year Ended December 31,
	2018			2017			Change
	Revenue		Billable Subscribers (1)	Revenue		Billable Subscribers (1)	Revenue		Billable Subscribers
	(Revenue in millions and subscribers in thousands)
Government service revenue	$	88	113	$	88	100	$	—	13

⁽¹⁾  Billable subscriber numbers shown are at the end of the respective period.

We provide Iridium airtime and airtime support to U.S. government and other authorized customers pursuant to a five-year EMSS contract executed in October 2013 and managed by Air Force Space Command. Under the terms of this agreement, authorized customers utilize Iridium airtime services provided through the DoD’s dedicated gateway. These services include unlimited global secure and unsecure voice, low and high-speed data, paging, broadcast, and DTCS services for an unlimited number of DoD and other federal subscribers. The service fee under the EMSS contract was fixed at$88 million per year for the years ended December 31, 2018 and 2017, and is not based on subscribers or usage, allowing an unlimited number of users access to existing services. The EMSS contract was extended until April 2019, an additional six months beyond the initial term, at the same pricing. We have begun discussions with the U.S. government on a new EMSS contract, which we expect to enter into in 2019, prior to expiration.

Subscriber Equipment Revenue

Subscriber equipment revenue increased$20.7 million, or27%, to$97.8 million for the year ended December 31, 2018 compared to the prior year. This increase was primarily due to an increase in volume ofhandset sales,short-burst data device sales andL-band transceiver unit sales.

Engineering and Support Service Revenue

	Year Ended December 31,
	2018		2017		Change
	(In millions)
Commercial	$	0.7	$	3.1	$	(2.4	)
Government	17.7		18.1		(0.4		)
Total	$	18.4	$	21.2	$	(2.8	)

Engineering and support service revenue decreased by$2.8 million, or13%, for the year ended December 31, 2018 compared to the prior year primarily as a result of adecrease in the volume of contracted work.

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Operating Expenses

Cost of Services (exclusive of depreciation and amortization)

Cost of services (exclusive of depreciation and amortization) includes the cost of network engineering and operations staff, including contractors, software maintenance, product support services, and cost of services for government and commercial engineering and support service revenue.

Cost of services (exclusive of depreciation and amortization) increased by$5.6 million, or7%, for the year ended December 31, 2018 compared to the prior year, primarily as a result ofin-orbit insurance costs from Iridium NEXT satellites placed into service during 2017 and 2018. The increase was partially offset by adecrease in volume of contracted work for engineering and support services.

Cost of Subscriber Equipment

Cost of subscriber equipment includes the direct costs of equipment sold, which consist of manufacturing costs, allocation of overhead, and warranty costs.

Cost of subscriber equipment increased$12.4 million, or28%, for the year ended December 31, 2018 compared to the prior year period primarily due to the increased volume of subscriber equipment described above.

Research and Development

Research and development expenses increased by$7.2 million, or47%, for the year ended December 31, 2018 compared to the prior year period primarily due toincreased spend on the development of Iridium Certus broadband to expand service functionality on our Iridium NEXT satellites.

Selling, General and Administrative

Selling, general and administrative expenses include sales and marketing costs as well as legal, finance, information technology, facilities, billing and customer care expenses.

Selling, general and administrative expenses increased by$13.4 million, or16%, for the year ended December 31, 2018 compared to the prior year, primarily due to an increase inemployee-related expenses andprofessional fees, including anincrease in stock appreciation rights expense resulting from anincrease in the share price of our common stock over the course of the year.

Depreciation and Amortization

Depreciation and amortization expense increased by$95.9 million, or78%, for the year ended December 31, 2018 compared to the prior year, primarily due to an increase in the average number of Iridium NEXT satellites placed into service during 2018 compared to 2017. We expect depreciation to increase until all satellites are placed into service in the first quarter of 2019.

Gain on Boeing Transaction

On January 3, 2017, pursuant to an Insourcing Agreement with Boeing, we hired the majority of Boeing employees and third party contractors who had previously been responsible for the operations and maintenance of our satellite constellation and ground infrastructure. As a result, we and Boeing terminated our previous Operations and Maintenance Agreement, or O&M Agreement, and our previous Iridium NEXT Support Service Agreement and entered into a new Development Services Agreement, or DSA, with a$6.0 million annual take-or-pay commitment through 2021.

In the first quarter of 2017, we recognized a$14.2 million gain consisting of (i) the derecognition of a purchase accounting liability of$11.0 million created when GHL Acquisition Corp. acquired Iridium in 2009 related to the fair value of the contractual arrangement with Boeing as of that date and (ii) the remainder of a credit, equal to$3.2 million, resulting from an O&M Agreement amendment in July 2010. No such transactions occurred in 2018.

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Other Income (Expense)

Interest Income (Expense), net

Interest expense, net, for the year ended December 31, 2018 was$62.4 million, compared to interest income, net, of$4.3 million for the prior year period. The increase in interest expense was the result ofless interest from the Credit Facility being capitalized as the average balance of satellites under constructiondecreased as satellites were launched and placed into service. Additional interest expense was also incurred as a result of theissuance of the Notes in March 2018 and the earlyprepayment of a portion of the Credit Facility and amounts due toThales Alenia Space for bills of exchange during the year ended December 31, 2018. These early prepayments collectively resulted in a$7.3 million loss on extinguishment of debt, recorded as interest expense, and represented premiums paid for early prepayment and the write-off of unamortized debt issuance costs. There was no loss on extinguishment of debt recorded within interest expense for the year ended December 31, 2017.

Income Tax Benefit

For the year ended December 31, 2018, our income tax benefit was$7.3 million, compared to an income tax benefit of$114.3 million for the prior year. Our effective tax rate was approximately35.4% for the year ended December 31, 2018 compared to(95.6)% for the prior year. The decrease in income tax benefit was primarily related to the one-time benefit in the prior year for the lower U.S. Federal corporate tax rate as a result of the Tax Act enacted in that period. See Note 12 to our condensed consolidated financial statements for more detail on our assessment of the Tax Act and the individual items impacting our effective tax rate for the year.

The current period tax benefit was also impacted by certain state tax law changes and the recording of state valuation allowances. In April 2018, Maryland enacted the single sales factor method for apportioning income to the state to be phased in over five years commencing in 2018. This change results in higher future Maryland taxes increasing our December 31, 2018 income tax provision by$7.0 million for the impact on our deferred tax assets and liabilities. Also included in our current period income tax benefit is$10.7 million of tax expense related to the recording of valuation allowances for certain state net operating losses, or NOLs. Due to state tax planning opportunities, we do not expect to fully utilize a portion of our state NOLs generated in the current year within the carryforward period. Should there be changes in either our state activities or laws, we may be able to utilize the state NOLs prior to expiration. If our current estimates change in future periods, the impact on the deferred tax assets and liabilities may change correspondingly.

Net Income (Loss)

Net loss was$13.4 million for the year ended December 31, 2018, compared to net income of$233.9 million during the prior year period. This decrease in net income was primarily the result of the reduced income tax benefit compared to the prior year, as described above, and the$95.9 million increase in depreciation and amortization expense. For the year ended December 31, 2018, the decrease in net income was also driven by the$66.8 million increase in interest expense, net,the $38.7 million increase in other operating expenses and the non-recurrence of the$14.2 million gain from the Boeing Insourcing Agreement in 2017. These reductions in income were partially offset by the $75.0 million increase in our total revenue, including the$57.0 million increase in service revenue.

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Comparison of Our Results of Operations for the Year Ended December 31, 2017 and the Year Ended December 31, 2016

	Year Ended December 31,
				% of Total Revenue					% of Total Revenue		Change
($ In thousands)	2017					2016					Dollars			Percent
Revenue:
Service revenue
Commercial	$	261,735		58	%	$	246,822		57	%	$	14,913		6	%
Government	88,000			20	%	88,000			20	%	—			0	%
Total service revenue	349,735			78	%	334,822			77	%	14,913			4	%
Subscriber equipment	77,119			17	%	74,211			17	%	2,908			4	%
Engineering and support services	21,192			5	%	24,607			6	%	(3,415		)	(14	)%
Total revenue	448,046			100	%	433,640			100	%	14,406			3	%
Operating expenses:
Cost of services (exclusive of depreciation
and amortization)	80,396			18	%	64,958			15	%	15,438			24	%
Cost of subscriber equipment	44,445			10	%	44,286			10	%	159			0	%
Research and development	15,247			3	%	16,079			4	%	(832		)	(5	)%
Selling, general and administrative	84,405			19	%	82,552			19	%	1,853			2	%
Depreciation and amortization	122,266			27	%	49,394			11	%	72,872			148	%
Total operating expenses	346,759			77	%	257,269			59	%	89,490			35	%
Gain on Boeing transaction	14,189			3	%	—			—	%	14,189			100	%
Operating income	115,476			26	%	176,371			41	%	(60,895		)	(35	)%
Other income (expense):
Interest income, net	4,328			1	%	2,934			1	%	1,394			48	%
Other expense, net	(232		)	0	%	(1,140		)	(1	)%	908			(80	)%
Total other income	4,096			1	%	1,794			0	%	2,302			128	%
Income before income taxes	119,572			27	%	178,165			41	%	(58,593		)	(33	)%
Income tax benefit (expense)	114,284			25	%	(67,133		)	(15	)%	181,417			(270	)%
Net income	$	233,856		52	%	$	111,032		26	%	$	122,824		111	%

Commercial Service Revenue

	Year Ended December 31,
	2017					2016					Change
	Revenue		Billable Subscribers (1)	ARPU (2)		Revenue		Billable Subscribers (1)	ARPU (2)		Revenue		Billable Subscribers	ARPU
	(Revenue in millions and subscribers in thousands)
Commercial voice and data	$	177.7	359	$	42	$	177.7	353	$	42	$	—	6	$	—
Commercial IoT data	74.1		510	$	13	65.5		413	$	14	8.6		97	$	(1.0	)
Hosted payload and other data services	9.9		N/A			3.6		N/A			6.3		N/A
Total Commercial	$	261.7	869			$	246.8	766			$	14.9	103

⁽¹⁾  Billable subscriber numbers are shown as of the end of the respective period.

⁽²⁾  Average monthly revenue per unit, or ARPU, is calculated by dividing revenue in the respective period by the average of the number of billable subscribers at the beginning of the period and the number of billable subscribers at the end of the period and then dividing the result by the number of months in the period. Billable subscriber and ARPU data is not applicable for hosted payload and other data service revenue items.

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For the year ended December 31, 2017, total commercial revenue increased $14.9 million, or 6%, primarily due to the increase in IoT of $8.6 million, or 13%, compared to the prior year. The increase in IoT is primarily due to a 23% increase in commercial IoT data billable subscribers, partially offset by a decline in the related ARPU due to the growth in subscribers using lower data usage plans. Hosted payload and other data service revenue increased $6.3 million, or 175%, from the prior year primarily due to the commencement of hosting and data services.

Government Service Revenue

	Year Ended December 31,
	2017			2016			Change
	Revenue		Billable Subscribers (1)	Revenue		Billable Subscribers (1)	Revenue		Billable Subscribers
	(Revenue in millions and subscribers in thousands)
Government service revenue	$	88	100	$	88	84	$	—	16

⁽¹⁾  Billable subscriber numbers shown are at the end of the respective period.

As described above, our service fee under our EMSS contract was fixed at $88 million per year during these years, and was not based on subscribers or usage, allowing an unlimited number of users access to existing services.

Subscriber Equipment Revenue

Subscriber equipment revenue increased $2.9 million, or 4%, to $77.1 million for the year ended December 31, 2017 compared to the prior year. This increase was primarily due to increased unit sales of handsets and L-band transceivers.

Engineering and Support Service Revenue

	Year Ended December 31,
	2017		2016		Change
	(In millions)
Commercial	$	3.1	$	2.2	$	0.9
Government	18.1		22.4		(4.3		)
Total	$	21.2	$	24.6	$	(3.4	)

Engineering and support service revenue decreased by $3.4 million, or 14%, for the year ended December 31, 2017 compared to the prior year primarily as a result of decreased revenue under a contract with the DoD to adapt the Iridium Extreme^®  handset for DoD applications, which was completed during 2017.

Operating Expenses

Cost of Services (exclusive of depreciation and amortization)

Cost of services (exclusive of depreciation and amortization) increased by $15.4 million, or 24%, for the year ended December 31, 2017 compared to the prior year, primarily as a result of insurance costs for Iridium NEXT satellites placed into service during 2017.

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Cost of Subscriber Equipment

Cost of subscriber equipment increased $0.2 million, which was substantially the same for the year ended December 31, 2017 as in the prior year.

Selling, General and Administrative

Selling, general and administrative expenses increased by $1.9 million, or 2%, for the year ended December 31, 2017 compared to the prior year, primarily due to increased professional fees associated with government regulatory requirements and other services.

Depreciation and Amortization

Depreciation and amortization expense increased by $72.9 million, or 148%, for the year ended December 31, 2017 compared to the prior year, primarily due to the write-off of $36.8 million of the construction-in-progress associated with the Kosmotras launch services in 2017 and the addition of new assets, including Iridium NEXT satellites placed into service during 2017.

Gain on Boeing Transaction

On January 3, 2017, pursuant to an Insourcing Agreement with Boeing, we hired the majority of Boeing employees and third party contractors who were responsible for the operations and maintenance of our satellite constellation and ground infrastructure. As a result, we and Boeing terminated our previous Operations and Maintenance Agreement, or O&M Agreement, and our previous Iridium NEXT Support Service Agreement and entered into a new Development Services Agreement, or DSA, with a $6.0 million annual take-or-pay commitment through 2021.

In the first quarter of 2017, we recognized a $14.2 million gain consisting of (i) the derecognition of a purchase accounting liability of $11.0 million created when GHL Acquisition Corp. acquired Iridium in 2009 related to the fair value of the contractual arrangement with Boeing as of that date and (ii) the remainder of a credit, equal to $3.2 million, resulting from an O&M Agreement amendment in July 2010.

Income Tax Benefit (Expense)

For the year ended December 31, 2017, our income tax benefit was $114.3 million compared to an income tax expense of $67.1 million for the prior year. Our effective tax rate was approximately (95.6)% for the year ended December 31, 2017 compared to 37.7% for the prior year. The decrease in the effective tax rate was primarily related to the net tax benefit on remeasuring our ending deferred tax balances at 21%, from 35%, for years beginning after December 31, 2017, to reflect the new tax rate under the Tax Act. As our current estimates change in future periods, the impact on the deferred tax assets and liabilities may change correspondingly.

Net Income

Net income was $233.9 million for the year ended December 31, 2017, an increase of $122.8 million from the prior year. This increase in net income was primarily driven by the decrease in the provision for income taxes and increase in revenue, offset by increases in depreciation expense, including the accelerated depreciation related to the write-off of Kosmotras launch services, as described above. 

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Liquidity and Capital Resources

As of December 31, 2018, our total cash and cash equivalents balance was$273.4 million. Our principal sources of liquidity are cash, cash equivalents and internally generated cash flows. Our principal liquidity requirements over the next twelve months are primarily principal and interest on the Credit Facility and interest on the Notes, as well as the final expenditures for the deployment of Iridium NEXT and dividends payable on our Series B Preferred Stock.

The aggregate costs associated with the design, build and launch of Iridium NEXT and related infrastructure upgrades through 2019 are estimated to be approximately$3 billion. As of December 31, 2018, our remaining costs to complete Iridium NEXT were expected to be less than $100.0 million, having previously paid for these costs using the substantial majority of our$1.8 billion Credit Facility, which was fully drawn as of February 2017, together with cash and cash equivalents on hand and internally generated cash flows.

In March 2018, we issued$360.0 million aggregate principal amount of Notes, before$9.0 million of deferred financing costs, for net proceeds of$351.0 million from the Notes. The Notes bear interest at10.25% per annum and mature on April 15, 2023. Interest is payable semi-annually on April 15 and October 15, and outstanding principal amounts will be due in full upon maturity. The proceeds of the Notes were used to prepay amounts due to Thales Alenia Space, to replenish the debt service reserve account, or DSRA, under the Credit Facility and to pay Thales Alenia Space milestones previously expected to be satisfied by the issuance of additional bills of exchange. The proceeds of the Notes also provide us with additional cash to make principal and interest payments under our Credit Facility and interest payments on the Notes. We were in compliance with all covenants under the Notes as of December 31, 2018.

Also in March 2018, we amended and restated our Credit Facility by a supplemental agreement, which was effective upon the issuance of the Notes. As amended and restated, the Credit Facility (i) allowed us to issue the Notes, (ii) delayed a portion of the principal repayments scheduled under the Credit Facility for 2018, 2019 and 2020 into 2023 and 2024 pursuant to an amended repayment installment schedule, (iii) allows us to access up to$87.0 million from the DSRA in the future if our projected cash level falls below$75.0 million, and (iv) adjusted our financial covenants, including eliminating covenants that required us to receive cash flows from hosted payloads and adding a covenant that requires us to receive$200.0 million in hosting fees from Aireon by December 2023. Under the Credit Facility, as amended to date, in the event that (a) our cash balance exceeds$140.0 million after September 30, 2019 (subject to specified exceptions) or (b) we receive hosting fees from Aireon, we would be required to use50% of such excess cash and up to$200.0 million of hosting fees to prepay the Credit Facility. In addition, if any of the Notes remain outstanding on October 15, 2022, which is six months prior to the scheduled maturity of the Notes, the maturity of all amounts remaining outstanding under the Credit Facility would be accelerated from September 30, 2024 to October 15, 2022.

In March 2018, we converted all outstanding shares of our Series A Preferred Stock into shares of common stock, resulting in the issuance of approximately10.6 million shares of common stock. In order to convert the Series A Preferred Stock, we declared and paid all current and cumulative dividends on our Series A Preferred Stock and Series B Preferred Stock in the amounts of$7.0 million and$8.4 million, respectively. In compliance with the Credit Facility, subsequent to the dividend payment, we began the planned suspension of dividends to holders of the Series B Preferred Stock for five quarters, beginning with the June 2018 dividend payment. The terms of our Series B Preferred Stock provide that, beginning in May 2019, we may be able to cause the conversion of the outstanding shares of our Series B Preferred Stock into common stock, subject to specified conditions, including (i) a daily volume-weighted average stock price of at least $11.21 per share over a period of 20 trading days in a 30-day period and (ii) the payment of cumulative dividends. Based on the current market price of our common stock, we expect to be able to cause the conversion of the Series B Preferred Stock prior to the completion of the five-quarter deferral period. However, prior to any such conversion, we will be required to declare and pay current and cumulative dividends on the Series B Preferred Stock.

We believe our liquidity sources will provide sufficient funds for us to meet our liquidity requirements for at least the next 12 months.

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As of December 31, 2018, we reported$1,604.8 million in borrowings under the Credit Facility in our consolidated balance sheet, net of$80.1 million of deferred financing costs, for an aggregate balance of$1,684.9 million outstanding under the Credit Facility. Pursuant to the Credit Facility, we maintain the DSRA. As of December 31, 2018, the DSRA balance was$191.9 million, which is classified as restricted cash in our condensed consolidated balance sheet. In addition to the minimum debt service levels, financial covenants under the Credit Facility, as amended to date, include:

• an available cash balance of at least$25 million;

• a debt-to-equity ratio, which is calculated as the ratio of total net debt to the aggregate of total net debt and total stockholders’ equity, of no more than0.7 to 1, measured each June 30 and December 31;

• specified maximum levels of annual capital expenditures (excluding expenditures on the construction of Iridium NEXT satellites) through the year ending December 31, 2024;

• a debt service coverage ratio of not less than1.5 to 1, measured each June 30 and December 31 through the year ending December 31, 2020, not less than1.25 to 1 for June 30 and December 31, 2021, and not less than1.5 to 1, for each June 30 and December 31 thereafter through 2024;

• specified maximum leverage levels that decline from a ratio of8.24 to 1 for the year ended December 31, 2018 to a ratio of2.00 to 1 for the year ending December 31, 2024; and

• a requirement that we receive at least$200.0 million in hosting fees from Aireon by December 31, 2023.

Our available cash balance, as defined by the Credit Facility, was$273.4 million as of December 31, 2018. Our debt-to-equity ratio was0.53 to 1 as of December 31, 2018. Our debt service coverage ratio was3.4 to 1 as of December 31, 2018, and our leverage was5.9 to 1 for the year ended December 31, 2018. We were also in compliance with the annual capital expenditures covenant as of December 31, 2018.

The covenant regarding capital expenditures is calculated in connection with a measurement, which we refer to as available cure amount, that is derived using a complex calculation based on overall cash flows, as adjusted by numerous measures specified in the Credit Facility. In a period in which our capital expenditures exceed the amount specified in the respective covenant, we would be permitted to allocate available cure amount, if any, to prevent a breach of the applicable covenant. As of December 31, 2018, we had an available cure amount of$62.5 million, although it was not necessary for us to apply any available cure amount to maintain compliance with the covenants. The available cure amount has fluctuated significantly from one measurement period to the next, and we expect that it will continue to do so.

The covenants also place limitations on our ability and that of our subsidiaries to carry out mergers and acquisitions, dispose of assets, grant security interests, declare, make or pay dividends, enter into transactions with affiliates, incur additional indebtedness, or make loans, guarantees or indemnities. If we are not in compliance with the financial covenants under the Credit Facility, after any opportunity to cure such non-compliance, or we otherwise experience an event of default under the Credit Facility, the lenders may require repayment in full of all principal and interest outstanding under the Credit Facility. It is unlikely we would have adequate funds to repay such amounts prior to the scheduled maturity of the Credit Facility. If we fail to repay such amounts, the lenders may foreclose on the assets we have pledged under the Credit Facility, which include substantially all of our assets and those of our domestic subsidiaries.

Cash Flows - Comparison of the Year Ended December 31, 2018 and the Year Ended December 31, 2017

The following table shows our consolidated cash flows:

	Year Ended December 31,
Statement of Cash Flows	2018			2017			Change
	(in thousands)
Net cash provided by operating activities	$	263,709		$	259,621		$	4,088
Net cash used in investing activities	$	(378,912	)	$	(372,680	)	$	(6,232	)
Net cash provided by financing activities	$	193,503		$	16,866		$	176,637

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Cash Flows from Operating Activities

Net cash provided by operating activities for the year ended December 31, 2018 increased by$4.1 million from the prior year. This increase was primarily due to a decrease in working capital related to timing of cash flows provided byprepaid and other current assets,accrued expenses anddeferred revenues. Working capital provided by operations is primarily driven by launch related activities, including utilization of prepaid expenses related to launch services and receipt of payments for milestones related to hosted payloads.

Cash Flows from Investing Activities

Net cash used in investing activities for the year ended December 31, 2018 increased$6.2 million from the prior year period primarily due to anincrease in net purchases of marketable securities, partially offset by adecrease in capital expenditures related to the timing of payments of our Iridium NEXT construction and launch.

Cash Flows from Financing Activities

Net cash provided by financing activities for the year ended December 31, 2018 increased by$176.6 million primarily due to theissuance of the Notes, offset in part by therelated deferred financing fees,prepayments to extinguish amounts owed to Thales Alenia Space, as well asprincipal repayments on the Credit Facility and thepayment of cumulative preferred dividends as described above.

Cash Flows - Comparison of the Year Ended December 31, 2017 and the Year Ended December 31, 2016

The following table shows our consolidated cash flows:

	Year Ended December 31,
Statement of Cash Flows	2017			2016			Change
	(in thousands)
Net cash provided by operating activities	$	259,621		$	225,199		$	34,422
Net cash used in investing activities	$	(372,680	)	$	(242,360	)	$	(130,320	)
Net cash provided by financing activities	$	16,866		$	224,178		$	(207,312	)

Cash Flows from Operating Activities

Net cash provided by operating activities for the year ended December 31, 2017 increased by $34.4 million from the prior year. This increase was primarily due to a $33.0 million decrease in working capital related to timing of cash flows provided by prepaid and other current assets, accrued expenses and deferred revenues. Working capital provided by operations is primarily driven by launch related activities, including utilization of prepaid expenses related to launch services and receipt of payments for milestones related to hosted payloads.

Cash Flows from Investing Activities

Net cash used in investing activities for the year ended December 31, 2017 increased by $130.3 million primarily due to fewer available-for-sale securities held in the current period, resulting in lower proceeds from investment maturities, offset by a $5.6 million decrease in capital expenditures.

Cash Flows from Financing Activities

Net cash provided by financing activities for the year ended December 31, 2017 decreased by $207.3 million primarily due to the decrease in borrowings and related fees under our Credit Facility in 2017, as it was fully drawn in February 2017, offset by the decrease in payments of preferred stock dividends related to the five-quarter deferral of preferred stock dividends that began in the second quarter of 2017.

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Contractual Obligations and Commitments

The following table summarizes our outstanding contractual obligations as of December 31, 2018 (in millions):

Contractual Obligations	Less than 1 year		1-3 Years		3-5 years		More than 5 years		Total
Payment obligations:
Thales Alenia Space (1)	$	44.3	$	—	$	—	$	—	$	44.3
SpaceX (2)	11.8		—		—		—		11.8
Boeing (3)	6.0		12.0		—		—		18.0
Debt obligations: (4)
Principal	126.0		522.0		1,026.0		370.9		2,044.9
Contractual interest	127.1		213.4		118.0		13.4		471.9
Operating lease obligations (5)	3.7		7.5		6.8		12.9		30.9
Uncertain tax positions (6)	—		—		—		—		1.1
Unconditional purchase obligations (7)	20.7		0.4		—		—		21.1
Total	$	339.6	$	755.3	$	1,150.8	$	397.2	$	2,644.0

⁽¹⁾  Thales Alenia Space obligations consist of remaining commitments under the FSD for the design and manufacture of satellites for Iridium NEXT.

⁽²⁾  SpaceX obligations consist of remaining payments to SpaceX as the primary launch services provider for Iridium NEXT.

⁽³⁾  Represents a five-year take-or-pay commitment under the Boeing DSA.

⁽⁴⁾  Debt obligations include repayment of the Credit Facility and Notes as of December 31, 2018. If any of the Notes remain outstanding on October 15, 2022, which is six months prior to their scheduled maturity, the maturity of all amounts remaining outstanding under the Credit Facility would be accelerated from September 30, 2024 to October 15, 2022. As such, for purposes of this table, we have assumed full principal repayment of the Notes in 2022. We have also included interest payments to be made on our fixed and variable rate tranches of the Credit Facility and interest on the Notes. Interest payments for variable rate debt have been estimated based on six-month LIBOR forward contracts at December 31, 2018. The repayment schedule for the Credit Facility excludes$120.0 million that we expect to receive upon the Aireon redemption of our equity interest in Aireon and any potential dividends on our Aireon equity ownership. The schedule also excludes payments of hosting fees to be received from Aireon under our hosting arrangement, which must be used to prepay the Credit Facility, which may result in an earlier repayment than set forth in the table.

⁽⁵⁾  Operating lease obligations do not include payments to landlords covering real estate taxes, common area maintenance and other charges, as such fees are not determinable based upon the provisions of our lease agreements.

⁽⁶⁾  As of December 31, 2018, we estimated our uncertain tax positions to be$1.1 million, including penalties and interest. However, we are unable to reasonably estimate the period of the possible future payments for the remaining balance, and therefore the remaining balance has not been reflected in a specified period.

⁽⁷⁾  Unconditional purchase obligations include our agreement with a supplier for the manufacturing of our devices and various commitments with other vendors that are enforceable, legally binding and have specified terms, including fixed or minimum quantities, minimum or variable price provisions, and a fixed timeline. Unconditional purchase obligations do not include agreements that are cancelable by us without penalty. As of December 31, 2018, contractually obligated purchase commitments for manufacturing supplies increased$4.7 million from the prior year.

The contractual obligations table does not include future payments of dividends on the Series B Preferred Stock. Holders of Series B Preferred Stock are entitled to receive cumulative cash dividends when, as and if declared from, and including, the date of original issue at a rate of6.75% per annum of the$250 liquidation preference per share, which is equivalent to an annual rate of$16.875 per share. Dividends on the Series B Preferred Stock are payable quarterly in arrears, on March 15, June 15, September 15 and December 15 of each year, although we have temporarily suspended dividend payments as noted above. The Series B Preferred stock does not have a stated maturity date. Holders of Series B Preferred Stock may elect to convert some or all of their outstanding shares to common stock at the stated conversion rate. We cannot forecast any such conversions of Series B Preferred Stock to common stock. As of December 31, 2018, there were497,000 shares of Series B Preferred Stock outstanding. On or after May 15, 2019, we may, at our option, convert some or all of the Series B Preferred Stock into the number of shares of common stock that are issuable at the then-applicable conversion rate, subject to specified conditions, including (i) a daily volume-weighted average stock price of at least $11.21 per share over a period of 20 trading days in a 30-day period and (ii) the payment of cumulative dividends.

61

Off-Balance Sheet Arrangements

We do not currently have, nor have we had in the last three years, any relationships with unconsolidated entities or financial partnerships, such as entities referred to as structured finance or special purpose entities, which would have been established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes.

Seasonality

Our results of operations have been subject to seasonal usage changes for commercial customers, and our results will be affected by similar seasonality going forward. March through October are typically the peak months for commercial voice services revenue and related subscriber equipment sales. U.S. government revenue and commercial IoT revenue have been less subject to seasonal usage changes.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk

The fixed price under the FSD with Thales Alenia Space is denominated in U.S. dollars. As a result, we do not bear any foreign currency exchange risk under the FSD.

We have outstanding an aggregate of$1,684.9 million under the Credit Facility as of December 31, 2018. A portion of the draws we made under the Credit Facility bear interest at a floating rate equal to the London Interbank Offered Rate, or LIBOR, plus1.95% and will, accordingly, subject us to interest rate fluctuations in future periods. Had the currently outstanding borrowings under the Credit Facility been outstanding throughout the year ended December 31, 2018, a one-half percentage point increase or decrease in the LIBOR wouldnot have had a material impact on our interest cost for the period.

The interest rate under the Notes is fixed, and as a result we are not exposed to fluctuations in interest rates with respect to our obligations under the Notes.

Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash and cash equivalents, as well as accounts receivable. We maintain our cash and cash equivalents with financial institutions with high credit ratings and at times maintain the balance of our deposits in excess of federally insured limits. The majority of our cash is swept nightly into a money market fund invested in U.S. treasuries, Agency Mortgage Backed Securities and/or U.S. government guaranteed debt. Accounts receivable are due from both domestic and international customers. We perform credit evaluations of our customers’ financial condition and record reserves to provide for estimated credit losses. Accounts payable are owed to both domestic and international vendors.

62

Item 8. Financial Statements and Supplementary Data

	Page
Iridium Communications Inc.:
Report of Ernst & Young LLP, Independent Registered Public Accounting Firm	64
Consolidated Balance Sheets	65
Consolidated Statements of Operations and Comprehensive Income (Loss)	66
Consolidated Statements of Changes in Stockholders’ Equity	67
Consolidated Statements of Cash Flows	68
Notes to Consolidated Financial Statements	69

63

Report of Ernst & Young LLP, Independent Registered Public Accounting Firm

To the Stockholders and the Board of Directors of Iridium Communications Inc.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Iridium Communications Inc. (the Company) as of December 31, 2018 and 2017, and the related consolidated statements of operations and comprehensive income (loss), changes in stockholders’ equity, and cash flows for each of the three years in the period ended December 31, 2018 and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2018 and 2017, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2018, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company’s internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) and our report dated February 28, 2019 expressed an unqualified opinion thereon.

Basis for Opinion

These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures include examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

/s/ Ernst & Young LLP

We have served as Company's auditor since 2001.

Tysons, Virginia

February 28, 2019

64

Iridium Communications Inc.

Consolidated Balance Sheets

(In thousands, except per share data)

	December 31, 2018			December 31, 2017
Assets
Current assets:
Cash and cash equivalents	$	273,352		$	285,873
Marketable securities	—			11,753
Accounts receivable, net	71,210			68,031
Inventory	27,538			20,068
Prepaid expenses and other current assets	18,284			25,347
Total current assets	390,384			411,072
Property and equipment, net	3,370,855			3,210,162
Restricted cash and cash equivalents	191,935			102,384
Other assets	12,557			8,414
Intangible assets, net	48,540			50,019
Total assets	$	4,014,271		$	3,782,051
Liabilities and stockholders' equity
Current liabilities:
Short-term credit facility	$	126,000		$	85,500
Accounts payable	12,869			43,100
Accrued expenses and other current liabilities	56,990			32,215
Interest payable	29,431			15,021
Deferred revenue	37,429			38,390
Total current liabilities	262,719			214,226
Long-term credit facility, net	1,478,739			1,618,055
Long-term senior unsecured notes, net	350,998			—
Deferred income tax liabilities, net	241,422			246,170
Deferred revenue, net of current portion	74,656			47,612
Other long-term liabilities	4,160			59,519
Total liabilities	2,412,694			2,185,582
Commitments and contingencies
Stockholders' equity:
Series A preferred stock, $0.0001 par value, 1,000 shares authorized and issued;
zero and 1,000 shares outstanding at December 31, 2018 and 2017, respectively	—			—
Series B preferred stock, $0.0001 par value, 500 shares authorized and issued;
497 and 500 shares outstanding at December 31, 2018 and 2017, respectively	—			—
Common stock, $0.001 par value, 300,000 shares authorized, 112,200 and 98,203
shares issued and outstanding at December 31, 2018 and 2017, respectively	112			98
Additional paid-in capital	1,108,550			1,081,373
Retained earnings	501,712			518,794
Accumulated other comprehensive loss, net of tax	(8,797		)	(3,796		)
Total stockholders' equity	1,601,577			1,596,469
Total liabilities and stockholders' equity	$	4,014,271		$	3,782,051

See notes to consolidated financial statements

65

Iridium Communications Inc.

Consolidated Statements of Operations and Comprehensive Income (Loss)

(In thousands, except per share amounts)

	Year Ended December 31,
	2018			2017			2016
Revenue:
Services	$	406,757		$	349,735		$	334,822
Subscriber equipment	97,848			77,119			74,211
Engineering and support services	18,403			21,192			24,607
Total revenue	523,008			448,046			433,640
Operating expenses:
Cost of services (exclusive of depreciation and amortization)	86,016			80,396			64,958
Cost of subscriber equipment	56,857			44,445			44,286
Research and development	22,429			15,247			16,079
Selling, general and administrative	97,846			84,405			82,552
Depreciation and amortization	218,207			122,266			49,394
Total operating expenses	481,355			346,759			257,269
Gain on Boeing transaction	—			14,189			—
Operating income	41,653			115,476			176,371
Other income (expense):
Interest income (expense), net	(62,441		)	4,328			2,934
Other income (expense), net	139			(232		)	(1,140		)
Total other income (expense)	(62,302		)	4,096			1,794
Income (loss) before income taxes	(20,649		)	119,572			178,165
Income tax benefit (expense)	7,265			114,284			(67,133		)
Net income (loss)	(13,384		)	233,856			111,032
Series A preferred stock dividends, declared and paid excluding
cumulative dividends	1,750			1,750			7,000
Series B preferred stock dividends, declared and paid excluding
cumulative dividends	2,109			2,109			8,436
Series A preferred stock dividends, undeclared	—			5,250			—
Series B preferred stock dividends, undeclared	6,290			6,327			—
Net income (loss) attributable to common stockholders	$	(23,533	)	$	218,420		$	95,596
Weighted average shares outstanding - basic	108,975			97,934			95,967
Weighted average shares outstanding - diluted	108,975			128,130			124,875
Net income (loss) attributable to common stockholders per share - basic	$	(0.22	)	$	2.23		$	1.00
Net income (loss) attributable to common stockholders per share - diluted	$	(0.22	)	$	1.82		$	0.89
Comprehensive income (loss):
Net income (loss)	$	(13,384	)	$	233,856		$	111,032
Foreign currency translation adjustments, net of tax	(5,017		)	1,664			3,487
Unrealized gain (loss) on marketable securities, net of tax	16			(14		)	130
Comprehensive income (loss)	$	(18,385	)	$	235,506		$	114,649

See notes to consolidated financial statements

66

Iridium Communications Inc.

Consolidated Statements of Changes in Stockholders’ Equity

(In thousands)

	Series A Convertible				Series B Convertible									Additional Paid-In Capital			Accumulated Other Comprehensive Income (Loss)			Retained Earnings			Total Stockholders' Equity
	Preferred Stock				Preferred Stock				Common Stock
	Shares		Amount		Shares		Amount		Shares		Amount
Balance at December 31, 2015	1,000		$	—	500		$	—	95,126		$	95		$	1,044,488		$	(9,063	)	$	193,201		$	1,228,721
Stock-based compensation	—		—		—		—		—		—			15,973			—			—			15,973
Stock options exercised and awards vested	—		—		—		—		753		1			548			—			—			549
Stock withheld to cover employee taxes	—		—		—		—		—		—			(627		)	—			—			(627		)
Excess tax benefit from exercise of stock-based compensation	—		—		—		—		—		—			(71		)	—			—			(71		)
Net income	—		—		—		—		—		—			—			—			111,032			111,032
Dividends on Series A preferred stock	—		—		—		—		—		—			—			—			(7,000		)	(7,000		)
Dividends on Series B preferred stock	—		—		—		—		—		—			—			—			(8,436		)	(8,436		)
Cumulative translation adjustments, net of tax	—		—		—		—		—		—			—			3,487			—			3,487
Unrealized gain on marketable securities, net of tax	—		—		—		—		—		—			—			130			—			130
Balance at December 31, 2016	1,000		—		500		—		95,879		96			1,060,311			(5,446		)	288,797			1,343,758
Stock-based compensation	—		—		—		—		—		—			18,694			—			—			18,694
Stock options exercised and awards vested	—		—		—		—		2,537		2			4,233			—			—			4,235
Stock withheld to cover employee taxes	—		—		—		—		(213	)	—			(1,865		)	—			—			(1,865		)
Net income	—		—		—		—		—		—			—			—			233,856			233,856
Dividends on Series A preferred stock	—		—		—		—		—		—			—			—			(1,750		)	(1,750		)
Dividends on Series B preferred stock	—		—		—		—		—		—			—			—			(2,109		)	(2,109		)
Cumulative translation adjustments, net of tax	—		—		—		—		—		—			—			1,664			—			1,664
Unrealized loss on marketable securities, net of tax	—		—		—		—		—		—			—			(14		)	—			(14		)
Balance at December 31, 2017	1,000		—		500		—		98,203		98			1,081,373			(3,796		)	518,794			1,596,469
Stock-based compensation	—		—		—		—		—		—			16,727			—			—			16,727
Stock options exercised and awards vested	—		—		—		—		3,443		4			12,441			—			—			12,445
Stock withheld to cover employee taxes	—		—		—		—		(148	)	(1		)	(1,980		)	—			—			(1,981		)
Net loss	—		—		—		—		—		—			—			—			(13,384		)	(13,384		)
Dividends on Series A preferred stock	—		—		—		—		—		—			—			—			(7,000		)	(7,000		)
Dividends on Series B preferred stock	—		—		—		—		—		—			—			—			(8,427		)	(8,427		)
Cumulative translation adjustments, net of tax	—		—		—		—		—		—			—			(5,017		)	—			(5,017		)
Changes from adoption of ASC 606, net of tax	—		—		—		—		—		—			—			—			11,729			11,729
Unrealized gain on marketable securities, net of tax	—		—		—		—		—		—			—			16			—			16
Preferred stock converted to common	(1,000	)	—		(3	)	—		10,702		11			(11		)	—			—			—
Balance at December 31, 2018	—		$	—	497		$	—	112,200		$	112		$	1,108,550		$	(8,797	)	$	501,712		$	1,601,577

See notes to consolidated financial statements

67

Iridium Communications Inc.

Consolidated Statements of Cash Flows

(In thousands)

	Year Ended December 31,
	2018			2017			2016
Cash flows from operating activities:
Net income (loss)	$	(13,384	)	$	233,856		$	111,032
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Deferred income taxes	(8,334		)	(115,812		)	63,808
Depreciation and amortization	218,207			122,266			49,394
Loss on extinguishment of debt and Thales Alenia Space bills of exchange	7,292			—			—
Stock-based compensation (net of amounts capitalized)	14,490			15,958			13,708
Gain from contract liability write-off	—			(14,189		)	—
Provision for doubtful accounts	198			(277		)	703
Provision for obsolete inventory	343			361			1,053
Amortization of premiums on marketable securities	(709		)	124			888
Amortization of deferred financing fees	10,145			—			—
Non-cash foreign currency losses (gains), net	342			(163		)	166
Changes in operating assets and liabilities:
Accounts receivable	(12,783		)	(10,343		)	(6,037		)
Inventory	(7,579		)	(1,946		)	9,029
Prepaid expenses and other current assets	5,705			2,875			(16,613		)
Other assets	(1,417		)	2,823			(2,128		)
Accounts payable	(732		)	896			3,209
Accrued expenses and other current liabilities	37,797			8,166			(6,416		)
Deferred revenue	13,530			15,129			4,115
Accrued satellite and network operation expense, net of current portion	—			—			(1,045		)
Other long-term liabilities	598			(103		)	333
Net cash provided by operating activities	263,709			259,621			225,199
Cash flows from investing activities:
Capital expenditures	(391,390		)	(400,107		)	(405,687		)
Purchases of marketable securities	(235,528		)	(7,013		)	(19,865		)
Sales and maturities of marketable securities	248,006			34,440			183,192
Net cash used in investing activities	(378,912		)	(372,680		)	(242,360		)
Cash flows from financing activities:
Borrowings under the Credit Facility	—			22,207			251,498
Repayments on the Credit Facility, including extinguishments	(80,359		)	—			—
Borrowings under the senior unsecured notes	360,000			—			—
Repayment of the Thales Alenia Space bills of exchange	(59,936		)	—			—
Payment of deferred financing fees	(21,239		)	(3,852		)	(11,806		)
Proceeds from exercise of stock options	12,445			4,235			549
Tax payment upon settlement of stock awards	(1,981		)	(1,865		)	(627		)
Payment of Series A preferred stock dividends	(7,000		)	(1,750		)	(7,000		)
Payment of Series B preferred stock dividends	(8,427		)	(2,109		)	(8,436		)
Net cash provided by financing activities	193,503			16,866			224,178
Effect of exchange rate changes on cash and cash equivalents	(1,270		)	144			512
Net increase (decrease) in cash and cash equivalents and restricted cash	77,030			(96,049		)	207,529
Cash, cash equivalents and restricted cash, beginning of period	388,257			484,306			276,777
Cash, cash equivalents and restricted cash, end of period	$	465,287		$	388,257		$	484,306

See notes to consolidated financial statements

Iridium Communications Inc.

Consolidated Statements of Cash Flows, continued

(In thousands)

	Year Ended December 31,
	2018		2017		2016
Supplemental cash flow information:
Interest paid	$	101,816	$	85,261	$	22,910
Income taxes paid, net	$	931	$	1,660	$	1,391
Supplemental disclosure of non-cash investing and financing activities:
Property and equipment received but not paid for yet	$	11,900	$	90,748	$	2,753
Interest capitalized but not paid	$	9,194	$	15,021	$	14,136
Capitalized amortization of deferred financing fees	$	16,306	$	27,304	$	28,688
Capitalized paid-in-kind interest	$	—	$	—	$	52,873
Capitalized stock-based compensation	$	2,237	$	2,736	$	2,265
Credit Facility repayment in exchange for the settlement of hosting (Note 14)	$	35,000	$	—	$	—
Cost basis investment in exchange for the settlement of accounts receivable	$	3,300	$	—	$	—

See notes to consolidated financial statements

68

Iridium Communications Inc.

Notes to Consolidated Financial Statements

December 31, 2018

1. Organization and Business

Iridium Communications Inc. (the “Company”), a Delaware corporation, offers voice and data communications services and products to businesses, U.S. and international government agencies and other customers on a global basis. The Company is a provider of mobile voice and data communications services via a constellation of low earth orbiting satellites. The Company holds various licenses and authorizations from the U.S. Federal Communications Commission (the “FCC”) and from foreign regulatory bodies that permit the Company to conduct its business, including the operation of its satellite constellation.

2. Significant Accounting Policies and Basis of Presentation

Principles of Consolidation and Basis of Presentation

The Company has prepared the consolidated financial statements in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”). The accompanying consolidated financial statements include the accounts of (i) the Company, (ii) its wholly owned subsidiaries, and (iii) all less than wholly owned subsidiaries that the Company controls. All material intercompany transactions and balances have been eliminated.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ materially from those estimates.

Adopted Accounting Pronouncements

Effective January 1, 2018, the Company adopted Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”), that supersedes nearly all existing revenue recognition guidance under U.S. GAAP. See Note 11 for more detail on the Company's adoption of ASU 2014-09.

Recent Accounting Developments Not Yet Adopted

In February 2016, the FASB issued ASU No. 2016-02, Leases (“ASU 2016-02”). ASU 2016-02 requires lessees to record most leases on their balance sheets but recognize expenses on their income statements in a manner similar to current accounting. The Company is applying the new guidance as of the effective date of January 1, 2019. Reporting organizations are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. The Company established a project team in order to analyze the effect of the standard on its leases by reviewing its current accounting policies to identify potential differences which would result from applying the requirements of the new standard to its leases. The Company will utilize the practical expedient to address all current operating leases for which it is the lessor and the lessee. On January 1, 2019, a lease liability and related right-of-use asset was recognized for operating lease arrangements where the Company is the lessee. Adoption of ASU 2016-02 will have an estimated impact of approximately$30.4 million on the Company's assets and liabilities for the addition of right-of-use assets and lease liabilities, but will not have a material impact on the Company's results of operations or liquidity.

69

Fair Value Measurements

The Company evaluates assets and liabilities subject to fair value measurements on a recurring and non-recurring basis to determine the appropriate level to classify them for each reporting period. This determination requires significant judgments to be made by management of the Company. The instruments identified as subject to fair value measurements on a recurring basis are cash and cash equivalents, marketable securities, prepaid expenses and other current assets, accounts receivable, accounts payable and accrued expenses and other current liabilities. Fair value is the price that would be received from the sale of an asset or paid to transfer a liability assuming an orderly transaction in the most advantageous market at the measurement date. U.S. GAAP establishes a hierarchical disclosure framework which prioritizes and ranks the level of observability of inputs used in measuring fair value. The fair value hierarchy consists of the following tiers:

• Level 1, defined as observable inputs such as quoted prices in active markets for identical assets or liabilities;

• Level 2, defined as observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and

• Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

The carrying values of short-term financial instruments (primarily cash and cash equivalents, prepaid expenses and other current assets, accounts receivable, accounts payable, and accrued expenses and other current liabilities) approximate their fair values because of their short-term nature. The fair value of the Company’s investments in money market funds approximates its carrying value; such instruments are classified as Level 1 and are included in cash and cash equivalents on the accompanying consolidated balance sheets.

The fair value of the Company’s investments in commercial paper and short-term U.S. agency securities with original maturities of less than ninety days approximates their carrying value; such instruments are classified as Level 2 and are included in cash and cash equivalents on the accompanying consolidated balance sheets. The fair value of the Company’s investments in fixed-income debt securities and commercial paper with original maturities of greater than ninety days are obtained using similar investments traded on active securities exchanges and are classified as Level 2. For fixed income securities that do not have quoted prices in active markets, the Company uses third-party vendors to price its debt securities resulting in classification as Level 2. All fixed-income securities are included in marketable securities on the accompanying consolidated balance sheets.

Concentrations of Credit Risk

Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents, marketable securities, and receivables. The majority of cash is invested into a money market fund with U.S. treasuries, Agency Mortgage Backed Securities and/or U.S. Government guaranteed debt. While the Company maintains its cash and cash equivalents with financial institutions with high credit ratings, it often maintains those deposits in federally insured financial institutions in excess of federally insured limits. When the Company holds marketable securities, they are highly-rated corporate and foreign fixed-income debt securities and commercial paper with an original maturity in excess of ninety days. The Company performs credit evaluations of its customers’ financial condition and records reserves to provide for estimated credit losses. Accounts receivable are due from both domestic and international customers.

Cash, Cash Equivalents and Restricted Cash

The Company considers all highly liquid investments with original maturities of ninety days or less to be cash equivalents. These investments, along with cash deposited in institutional money market funds, regular interest bearing depository accounts and non-interest bearing depository accounts, are classified as cash and cash equivalents on the accompanying consolidated balance sheets. The Company is required to maintain a minimum cash reserve for debt service related to its credit facility with Bpifrance Assurance Export S.A.S. ("BPIAE") (as amended to date, the "Credit Facility").

Marketable Securities

Marketable securities consist of fixed-income debt securities and commercial paper with an original maturity in excess of ninety days. These investments are classified as available-for-sale and are included in marketable securities within current assets on the accompanying consolidated balance sheets. All investments are carried at fair value. Unrealized gains and losses, net of taxes, are reported as a component of other comprehensive income or loss. The specific identification method is used to

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determine the cost basis of the marketable securities sold. There were no material realized gains or losses on the sale of marketable securities for the years ended December 31, 2018 and 2017. The Company regularly monitors and evaluates the fair value of its investments to identify other-than-temporary declines in value, and the Company determined that there were no such declines in fair value of investments as of December 31, 2017. The Company did not hold any marketable securities as of December 31, 2018 and therefore a review of amortized cost basis for other-than-temporary impairment was not required.

Accounts Receivable

Trade accounts receivable are recorded at the invoiced amount and are subject to late fee penalties. Management develops its estimate of an allowance for uncollectible receivables based on the Company’s experience with specific customers, aging of outstanding invoices, its understanding of customers’ current economic circumstances and its own judgment as to the likelihood that the Company will ultimately receive payment. The Company writes off its accounts receivable when balances ultimately are deemed uncollectible. The allowance for doubtful accounts was not material as of December 31, 2018 and 2017.

Foreign Currencies

The functional currency of the Company’s foreign consolidated subsidiaries is the local currency. Assets and liabilities of its foreign subsidiaries are translated to U.S. dollars based on exchange rates at the end of the reporting period. Income and expense items are translated at the weighted-average exchange rates prevailing during the reporting period. Translation adjustments are accumulated in a separate component of stockholders’ equity. Transaction gains or losses are classified as other income (expense), net in the accompanying consolidated statements of operations and comprehensive income (loss). In instances where the financial statements of a foreign entity in a highly inflationary economy are material, they are remeasured as if the functional currency were the reporting currency. In these instances, the financial statements of those entities are remeasured into the reporting currency. A highly inflationary economy is one that has cumulative inflation of approximately 100% or more over a three-year period.

Deferred Financing Costs

Direct and incremental costs incurred in connection with securing debt financing are deferred and are amortized as additional interest expense using the effective interest method over the term of the related debt. As of December 31, 2018 and 2017, the Company had deferred approximately$80.1 million and$97.2 million, respectively, of direct and incremental financing costs, net of amortization, associated with securing debt financing under the Credit Facility for the Company's next-generation constellation ("Iridium NEXT"). As of December 31, 2018 and 2017, the balance of deferred financing costs for borrowings under the Company's senior unsecured notes (the "Notes") was$9.0 million and zero, respectively.

Capitalized Interest

Interest costs associated with financing the Company’s assets during the construction period of Iridium NEXT have been capitalized. Total capitalized interest costs, under the Credit Facility and the Notes, for the years ended December 31, 2018, 2017 and 2016 were$76.7 million,$114.4 million and$106.4 million, respectively, which include amortization of deferred financing costs and accrued interest, as discussed above.

Inventory

Inventory consists primarily of finished goods, although the Company at times also maintains an inventory of raw materials from third-party manufacturers. The Company outsources manufacturing of subscriber equipment to a third-party manufacturer and purchases accessories from third-party suppliers. The Company’s cost of inventory includes an allocation of overhead, including payroll and payroll-related costs of employees directly involved in bringing inventory to its existing condition, and freight. Inventories are valued using the average cost method and are carried at the lower of cost or net realizable value. Accordingly, the Company recorded expense of$0.3 million,$0.4 million and$1.1 million for the years ended December 31, 2018, 2017 and 2016, respectively, which are included within the cost of subscriber equipment for excess and obsolete inventory. The expenses for the years ended December 31, 2018, 2017 and 2016 were primarily related to certain handset parts and accessories.

The Company has a manufacturing agreement with Benchmark Electronics Inc. (“Benchmark”) to manufacture most of its subscriber equipment. Pursuant to the agreement, the Company may be required to purchase excess materials at cost plus a contractual markup if the materials are not used in production within the periods specified in the agreement. Benchmark will then repurchase such materials from the Company at the same price paid by the Company, as required for the production of the subscriber equipment.

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Stock-Based Compensation

The Company accounts for stock-based compensation at fair value. The fair value of stock options is determined at the grant date using the Black-Scholes option pricing model. The fair value of restricted stock units (“RSUs”) is equal to the closing price of the underlying common stock on the grant date. The fair value of an award that is ultimately expected to vest is recognized on a straight-line basis over the requisite service or performance period and is classified in the consolidated statements of operations and comprehensive income in a manner consistent with the classification of the recipient’s compensation. The expected vesting of the Company’s performance-based RSUs is based upon the probability that the Company achieves the defined performance goals. The level of achievement of performance goals, if any, is determined by the compensation committee. Stock-based awards to non-employee consultants are expensed at their fair value as services are provided according to the terms of their agreements and are classified in selling, general and administrative expenses in the accompanying consolidated statements of operations and comprehensive income. Classification of stock-based compensation by line item on the balance sheet and statement of operations is presented below:

	Year Ended December 31,
	2018		2017
	(In thousands)
Property and equipment, net	$	1,865	$	2,326
Inventory	234		280
Prepaid and other current assets	138		132
Cost of subscriber equipment	26		30
Cost of services (exclusive of depreciation and amortization)	3,600		4,366
Research and development	340		349
Selling, general and administrative	10,524		11,211
Total stock-based compensation	$	16,727	$	18,694

Property and Equipment

Property and equipment is carried at cost less accumulated depreciation. Depreciation is calculated using the straight-line method over the following estimated useful lives:

First-generation satellites	15-21 years
Next-generation satellites	12.5 years
Ground system	5-7 years
Equipment	3-5 years
Internally developed software and purchased software	3-7 years
Building	39 years
Building improvements	5-39 years
Leasehold improvements	shorter of useful life or remaining lease term

The estimated useful lives of the Company’s first-generation satellites reflected the expected use for each satellite. Satellites were depreciated on a straight-line basis through the date they were replaced by next-generation satellites. The Company completed its launches of the next-generation satellites in early 2019. Iridium NEXT satellites will be depreciated on a straight-line basis over their estimated useful life, which is currently12.5 years.

The Company calculates depreciation expense using the straight-line method and evaluates the appropriateness of the useful life used in this calculation on a quarterly basis or as events occur that require additional assessment. 

Repairs and maintenance costs are expensed as incurred.

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Long-Lived Assets

The Company assesses its long-lived assets for impairment when indicators of impairment exist. Recoverability of assets is measured by comparing the carrying amounts of the assets to the future undiscounted cash flows expected to be generated by the assets. Any impairment loss would be measured as the excess of the assets’ carrying amount over their fair value.

In June 2011, the Company entered into an agreement with International Space Company Kosmotras ("Kosmotras"), as a supplemental launch services provider for Iridium NEXT. The original cost under the Kosmotras agreement was$51.8 million. Kosmotras to date has been unable to obtain the permits or authorizations to launch the Company's satellites on a Dnepr rocket as planned, and Kosmotras has proposed no satisfactory alternative launch plan. As the Company believed the construction-in-progress associated with the Kosmotras launch services will no longer be used or further developed, the Company wrote-off the full amount previously paid to Kosmotras, by recording accelerated depreciation expense of$36.8 million, in the fourth quarter of 2017. There were no similar write-offs during the years ended December 31, 2018 and 2016.

Intangible Assets

The Company’s intangible assets with finite lives are amortized over their useful lives and reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. If any indicators were present, the Company would test for recoverability by comparing the carrying amount of the asset to the net undiscounted cash flows expected to be generated from the asset. If those net undiscounted cash flows do not exceed the carrying amount (i.e., the asset is not recoverable), the Company would perform the next step, which is to determine the fair value of the asset and record an impairment loss, if any. The Company evaluates the useful lives for these intangible assets each reporting period to determine whether events and circumstances warrant a revision in their remaining useful lives.

Amortization is calculated using the straight-line method over the following estimated useful lives:

Intellectual property	20 years
Assembled workforce	7 years
Patents	14 - 20 years

Revenue Recognition

The Company derives its revenue primarily as a wholesaler of satellite communications products and services. The primary types of revenue include (i) service revenue (access and usage-based airtime fees), (ii) subscriber equipment revenue, and (iii) revenue generated by providing engineering and support services to commercial and government customers. In addition to the discussion immediately below, see Note 11 for further discussion of the Company's revenue recognition.

Wholesaler of satellite communications products and services

Pursuant to wholesale agreements, the Company sells its products and services to service providers who, in turn, sell the products and services to other distributors or directly to the end users. The Company recognizes revenue when an arrangement exists, services or equipment are transferred, the transaction price is determined, the arrangement has commercial substance, and collection of consideration is probable.

Contracts with multiple performance obligations

At times, the Company sells services and equipment through arrangements that bundle equipment, airtime and other services. For these revenue arrangements when the Company sells services and equipment in bundled arrangements and determines that it has separate distinct performance obligations, the Company allocates the bundled contract price among the various performance obligations based on each deliverable’s stand-alone selling price. If the stand-alone selling price is not directly observable, the Company estimates the amount to be allocated for each performance obligation based on observable market transactions or the residual approach. When the Company determines the performance obligations are not distinct, the Company recognizes revenue on a combined basis as the last obligation is satisfied. To the extent the Company's contracts include variable consideration, the transaction price includes both fixed and variable consideration. The variable consideration contained within the Company's contracts with customers may include discounts, credits and other similar items. When a contract includes variable consideration, the Company evaluates the estimate of the variable consideration to determine whether the estimate needs to be constrained; therefore, the Company includes the variable consideration in the transaction

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price only to the extent that it is probable that a significant reversal of the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved. Variable consideration estimates are updated at the end of each quarter. 

Service revenue sold on a stand-alone basis

Service revenue is generated from the Company’s service providers through usage of its satellite system and through fixed monthly access fees per user charged to service providers. Revenue for usage is recognized when usage occurs. Revenue for fixed-per-user access fees is recognized over the usage period in which the services are provided to the end user. The Company sells prepaid services in the form of e-vouchers and prepaid cards. A liability is established equal to the cash paid upon purchase for the e-voucher or prepaid card. On January 1, 2018, upon the adoption of ASU 2014-09, the Company now (i) recognizes revenue from the prepaid services upon the use of the e-voucher or prepaid card by the customer and (ii) estimates the expected revenue that will expire unused on an ongoing basis and recognizes this revenue in a manner consistent with the usage period. Prior to January 1, 2018, revenue from unused prepaid services was recognized upon expiration of the prepaid card. The Company does not offer refunds for unused prepaid services.

Services sold to the U.S. government

The Company provides airtime and airtime support to U.S. government and other authorized customers pursuant to the Enhanced Mobile Satellite Services (“EMSS”) contract managed by Air Force Space Command. Under the terms of this agreement, authorized customers continue to utilize airtime services, provided through the U.S. Department of Defense’s (“DoD”) dedicated gateway. These services include unlimited global secure and unsecure voice, low and high-speed data, paging, broadcast and Distributed Tactical Communications Services (“DTCS”) services for an unlimited number of DoD and other federal subscribers. The EMSS contract was extended for an additional six months at the annual rate of$88 million per year for the remaining term and now expires in April 2019. Under this contract, revenue is based on the annual fee for the fixed-price contract with unlimited subscribers, and is recognized on a straight-line basis over each contractual year. The U.S. government purchases its subscriber equipment from third-party distributors and not directly from the Company.

Subscriber equipment sold on a stand-alone basis

The Company recognizes subscriber equipment sales and the related costs when title to the equipment (and the risks and rewards of ownership) passes to the customer, typically upon shipment. Customers do not have rights of return without prior consent from the Company.

Government engineering and support services

The Company provides maintenance services to the U.S. government’s dedicated gateway. This revenue is recognized ratably over the periods in which the services are provided; the related costs are expensed as incurred.

Other government and commercial engineering and support services

The Company also provides engineering services to assist customers in developing new technologies for use on the Company’s satellite system. The revenue associated with fixed-fee contracts is recognized over time using costs incurred to date relative to total estimated costs at completion to measure progress toward satisfying its performance obligation. The Company does not include purchases of goods from a third party in its evaluation of costs incurred. Incurred costs represent work performed, which corresponds with, and thereby best depicts, the transfer of control to the customer. Revenue on cost-plus-fixed-fee contracts is recognized to the extent of estimated costs incurred plus the applicable fees earned. The Company considers fixed fees under cost-plus-fixed-fee contracts to be earned in proportion to the allowable costs incurred in performance of the contract.

Research and Development

Research and development costs are charged to expense in the period in which they are incurred.

Advertising Costs

Costs associated with advertising and promotions are expensed as incurred. Advertising expenses were$0.4 million,$0.3 million and$0.5 million for the years ended December 31, 2018, 2017 and 2016, respectively.

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Income Taxes

The Company accounts for income taxes using the asset and liability approach, which requires the recognition of tax benefits or expenses for temporary differences between the financial reporting and tax bases of assets and liabilities. A valuation allowance is established when necessary to reduce deferred tax assets to the amounts expected to be realized. The Company also recognizes a tax benefit from uncertain tax positions only if it is “more likely than not” that the position is sustainable based on its technical merits. The Company’s policy is to recognize interest and penalties on uncertain tax positions as a component of income tax expense.

Net Income (Loss) Per Share

The Company calculates basic net income (loss) per share by dividing net income (loss) attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. Diluted net income (loss) per share takes into account the effect of potential dilutive common shares when the effect is dilutive. The effect of potential dilutive common shares, including common stock issuable upon exercise of outstanding stock options, is computed using the treasury stock method. The effect of potential dilutive common shares from the conversion of the outstanding convertible preferred securities is computed using the as-if converted method at the stated conversion rate. The Company’s unvested RSUs awarded to the board of directors contain non-forfeitable rights to dividends and therefore are considered to be participating securities in periods of net income. The calculation of basic and diluted net income (loss) per share excludes net income attributable to these unvested RSUs from the numerator and excludes the impact of these unvested RSUs from the denominator.

3. Cash and Cash Equivalents, Restricted Cash and Investments

Cash and Cash Equivalents

The following table summarizes the Company’s cash and cash equivalents:

	December 31,				Recurring Fair Value Measurement
	2018		2017
	(In thousands)
Cash and cash equivalents:
Cash	$	20,879	$	24,092
Money market funds	252,473		251,950		Level 2
Commercial paper	—		9,831		Level 2
Total cash and cash equivalents	$	273,352	$	285,873

Restricted Cash and Cash Equivalents

The Company is required to maintain a minimum cash reserve within a debt service reserve account ("DSRA") for debt service related to its Credit Facility (see Note 7). As of December 31, 2018 and 2017, the Company’s restricted cash and cash equivalents balances, which include the minimum cash reserve for debt service and the interest earned on these amounts, were$191.9 million and$102.4 million, respectively.

Marketable Securities

As of December 31, 2018, the Company did not hold any investment positions in marketable securities. As of December 31, 2017, the Company held$11.8 million in marketable securities, consisting of fixed-income debt securities and U.S. treasuries. Marketable securities due to mature within one year had a fair value of$11.5 million, and marketable securities due to mature between one and three years had a fair value of$0.3 million. During the years ended December 31, 2018 and 2017, there were no material realized gains or losses.

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4. Property and Equipment

Property and equipment consisted of the following:

	December 31,
	2018			2017
	(In thousands)
Satellite system	$	2,766,627		$	1,199,794
Ground system	60,656			67,576
Equipment	42,152			35,616
Internally developed software and purchased software	215,252			191,089
Building and leasehold improvements	30,517			32,130
Total depreciable property and equipment	3,115,204			1,526,205
Less: accumulated depreciation	(453,463		)	(432,833		)
Total depreciable property and equipment, net of accumulated depreciation	2,661,741			1,093,372
Land	8,037			8,037
Construction-in-process:
Iridium NEXT systems under construction	658,395			2,088,380
Other construction-in-process	42,682			20,373
Total property and equipment, net of accumulated depreciation	$	3,370,855		$	3,210,162

Other construction-in-process consisted of the following:

	December 31,
	2018		2017
	(In thousands)
Internally developed software	$	27,725	$	14,782
Equipment	12,841		4,241
Ground system	2,116		1,350
Total other construction-in-process	$	42,682	$	20,373

Depreciation expense was$216.6 million,$120.7 million and$48.6 million for the years ended December 31, 2018, 2017 and 2016, respectively. The increase in depreciation from 2017 to 2018 results primarily from the addition of Iridium NEXT satellites placed into service during 2018.

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5. Intangible Assets

The Company had identifiable intangible assets as follows:

	December 31, 2018
	Useful Life (years)	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
	(In thousands)
Indefinite life intangible assets:
Trade names	Indefinite	$	21,195	$	—		$	21,195
Spectrum and licenses	Indefinite	14,030		—			14,030
Total		35,225		—			35,225
Definite life intangible assets:
Intellectual property	20 years	16,439		(7,434		)	9,005
Assembled workforce	7 years	5,678		(1,622		)	4,056
Patents	14 - 20	274		(20		)	254
Total		22,391		(9,076		)	13,315
Total intangible assets		$	57,616	$	(9,076	)	$	48,540

	December 31, 2017
	Useful Life (years)	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
	(In thousands)
Indefinite life intangible assets:
Trade names	Indefinite	$	21,195	$	—		$	21,195
Spectrum and licenses	Indefinite	14,030		—			14,030
Total		35,225		—			35,225
Definite life intangible assets:
Intellectual property	20 years	16,439		(6,651		)	9,788
Assembled workforce	7 years	5,678		(812		)	4,866
Patents	14 - 20	146		(6		)	140
Total		22,263		(7,469		)	14,794
Total intangible assets		$	57,488	$	(7,469	)	$	50,019

Amortization expense was$1.6 million,$1.6 million and$0.8 million for the years ended December 31, 2018, 2017 and 2016, respectively. See Note 8 for further details on the Boeing assembled workforce, added in 2017.

Future amortization expense with respect to intangible assets existing at December 31, 2018, by year and in the aggregate, was as follows:

Year ending December 31,	Amount
	(In thousands)
2019	$	1,609
2020	1,609
2021	1,609
2022	1,609
2023	1,609
Thereafter	5,270
Total estimated future amortization expense	$	13,315

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6. Commitments and Contingencies

Thales Alenia Space

In June 2010, the Company executed a primarily fixed-price full-scale development contract ("FSD") with Thales Alenia Space for the design and build of satellites for its Iridium NEXT satellites. The total price under the FSD is approximately$2.3 billion, and the Company expects payment obligations under the FSD to extend into thesecond quarter of 2019. As of December 31, 2018, the Company had made aggregate payments of$2.2 billion to Thales Alenia Space, which are capitalized as construction-in-progress within property and equipment, net, in the accompanying consolidated balance sheet, of which$1.5 billion were financed from borrowings under the Credit Facility.

On March 9, 2018, the Company and Thales Alenia Space entered into an amendment to the FSD, pursuant to which the Company and Thales Alenia Space unwound the prior changes that allowed for the deferral of certain milestone payments totaling$100.0 million through the issuance of bills of exchange. The March 2018 amendment to the FSD became effective on March 21, 2018, upon the Company's receipt of proceeds from a senior unsecured notes offering (see Note 7). The Company utilized a portion of the proceeds from the senior unsecured notes to prepay in full the$59.9 million of amounts due under outstanding bills of exchange, replenish the DSRA under the Credit Facility to $189.0 million, and to pay approximately$44.4 million in Thales Alenia Space milestones previously expected to be satisfied by the issuance of additional bills of exchange. In connection with the prepayment of the Thales Alenia Space bills of exchange, for the year ended December 31, 2018, the Company recorded a$4.0 million loss on extinguishment of debt, included within interest expense, representing premiums paid and the write-off of unamortized debt issuance costs. The Company had no loss on extinguishment of debt recorded for the year ended December 31, 2017.

SpaceX

In March 2010, the Company entered into an agreement with Space Exploration Technologies Corp. (“SpaceX”) to secure SpaceX as the primary launch services provider for Iridium NEXT (as amended to date, the “SpaceX Agreement”). The total price under the SpaceX Agreement for seven launches and a reflight option in the event of launch failure is$448.9 million. The SpaceX Falcon 9 rocket was configured to carry ten Iridium NEXT satellites to orbit for each of the initial seven launches. In November 2016, the Company entered into an agreement for an eighth launch with SpaceX to launch five additional satellites and to share the launch services with GFZ German Research Centre for Geosciences (“GFZ”). This launch took place in May 2018. The total price under the SpaceX Agreement for the eighth launch was$61.9 million. GFZ paid the Company$29.8 million to include the launch of NASA’s two Gravity Recovery and Climate Experiment Follow-On satellites. As of December 31, 2018, the Company had made aggregate payments of$498.9 million to SpaceX, which were capitalized as construction-in-progress within property and equipment, net in the accompanying consolidated balance sheets. The Company expects payments to SpaceX to continue into the first quarter of 2019.

Kosmotras

In June 2011, the Company entered into an agreement with Kosmotras as a supplemental launch services provider for Iridium NEXT. The original cost under the Kosmotras agreement was$51.8 million. Kosmotras to date has been unable to obtain the permits or authorizations to launch the Company's satellites on a Dnepr rocket as planned, and Kosmotras has proposed no satisfactory alternative launch plan. As a result, the Company wrote-off the full amount previously paid to Kosmotras, by recording accelerated depreciation expense of$36.8 million, in the fourth quarter of 2017. 

Iridium NEXT Launch and In-Orbit Insurance

The Company was required, pursuant to its Credit Facility, to obtain insurance covering the launch and first 12 months of operation of the Iridium NEXT satellites. The launch and in-orbit insurance the Company obtained contains elements, consistent with the terms of the Credit Facility, of self-insurance and deductibles, providing reimbursement only after a specified number of satellite failures. As a result, a failure of one or more of the Company’s satellites, or the occurrence of equipment failures and other related problems, could constitute an uninsured loss or require the payment of additional premiums and could harm the Company’s financial condition. Furthermore, launch and in-orbit insurance does not cover lost revenue. The total premium for the company's current launch and in-orbit insurance is$120.7 million, which waspaid in full as of December 31, 2018.

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Due to various contractual requirements with Motorola, the prior operator of the Company's first-generation satellite constellation, the Company is required to maintain a third-party liability in-orbit insurance policy on its first-generation satellites with a de-orbiting endorsement to cover potential claims relating to operating or de-orbiting the satellite constellation or individual satellites.

The current policy has a renewable one-year term, which is scheduled to expire onDecember 8, 2019. The policy coverage is separated into Sections A, B, and C.

Section A coverage is currently in effect and covers product liability over Motorola’s position as manufacturer of the first-generation satellites. Liability limits for claims under Section A are$1.0 billion per occurrence and in the aggregate. There is no deductible for claims.

Section B coverage is currently in effect and covers risks in connection with in-orbit satellites and for the de-orbit of individual satellites. Liability limits for claims under Section B are$500 million per occurrence and in the aggregate for space vehicle liability and$500 million and$1.0 billion per occurrence and in the aggregate, respectively, with respect to de-orbiting. The balance of the unamortized premium payment for Sections A and B coverage as of December 31, 2018 is included in prepaid expenses and other current assets in the accompanying consolidated balance sheet. The deductible for claims under Section B is$250,000 per occurrence.

Section C coverage is effective once requested by the Company and covers risks in connection with a mass decommissioning of the first-generation satellites. Liability limits for claims under Section C are$500 million and$1.0 billion per occurrence and in the aggregate, respectively. As of December 31, 2018, the Company had not requested Section C coverage since no mass decommissioning activities are currently anticipated. The deductible for claims under Section C is$250,000 per occurrence.

Unconditional Purchase Obligations

The Company has a manufacturing agreement with Benchmark. Pursuant to the agreement, the Company may be required to purchase certain materials if the materials are not used in production within the periods specified in the agreement. Benchmark will then repurchase such materials from the Company at the same price paid by the Company, as required for the production of the devices. As of December 31, 2018 and 2017, the Company had$2.5 million and$4.0 million, respectively, of such materials, and the amounts were included in inventory on the accompanying consolidated balance sheets.

As of December 31, 2018, the aggregate unconditional purchase obligations were$39.1 million, which includes the Company’s commitments with Boeing and Benchmark as well as$7.2 million of open purchase orders executed with other vendors. The Boeing obligations (see Note 8) represent the take-or-pay commitment with the execution of the Development Services Agreement (“DSA”). The Company's obligation to Benchmark for the year ending December 31, 2019 is$13.9 million.

Operating Leases

The Company leases land, office space, and office and computer equipment under noncancelable operating lease agreements. The Company adopted ASC 842, the new lease accounting standard, effective January 1, 2019 (see Note 2). Most of the leases contain renewal options of 1 to 10 years. The Company’s obligations under the current terms of these leases extend through 2030.

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Additionally, several of the Company’s leases contain clauses for rent escalation including, but not limited to, a pro-rata share of increased operating and real estate tax expenses. Rent expense is recognized on a straight-line basis over the lease term. Future minimum lease payments, by year and in the aggregate, under noncancelable operating leases at December 31, 2018, are as follows:

Year ending December 31,	Operating Leases
	(In thousands)
2019	$	3,692
2020	3,734
2021	3,827
2022	3,402
2023	3,359
Thereafter	12,926
Total	$	30,940

Rent expense for the years ended December 31, 2018, 2017 and 2016 was$3.3 million,$3.2 million and$3.1 million, respectively.

Contingencies

From time to time, in the normal course of business, the Company is party to various pending legal claims and lawsuits. The Company is not aware of any actions that it expects to have a material adverse impact on its business, financial results or financial condition.

7. Debt

Credit Facility

In October 2010, the Company entered into its$1.8 billion Credit Facility with a syndicate of bank lenders, which was amended and restated most recently on March 9, 2018. As of December 31, 2018, the Company reported an aggregate total of$1,684.9 million in borrowings, including$80.1 million of unamortized deferred financing costs, for a net balance of$1,604.8 million in borrowings from the Credit Facility in the accompanying consolidated balance sheet. Ninety-five percent of the Company's obligations under the Credit Facility are insured by BPIAE. Scheduled semi-annual principal repayments began on April 3, 2018, and are scheduled to be paid each March 30 and September 30.

As amended and restated, the Credit Facility (i) allowed the Company to issue$360.0 million in senior unsecured notes, (ii) delayed a portion of the principal repayments scheduled under the Credit Facility for 2018, 2019 and 2020 into 2023 and 2024 pursuant to an amended repayment installment schedule, (iii) allowed the Company to access up to$87.0 million from the DSRA in the future if its projected cash level falls below$75.0 million, and (iv) adjusted the Company’s financial covenants, including eliminating covenants that required the Company to receive cash flows from hosted payloads and adding a covenant that requires the Company to receive$200.0 million in hosting fees from Aireon LLC, the Company's primary hosted payload customer, by December 2023. In the event that (a) the Company's cash balance exceeds$140.0 million after September 30, 2019 (subject to specified exceptions) or (b) the Company receives hosting fees from Aireon, the Company would be required pursuant to the Credit Facility to use50% of such excess cash and up to$200.0 million of hosting fees to prepay the Credit Facility. In addition, if any of the Company's senior unsecured notes remain outstanding on October 15, 2022, which is six months prior to the scheduled maturity thereof, the maturity of all amounts remaining outstanding under the Credit Facility would be accelerated from September 30, 2024 to October 15, 2022. Lender fees incurred related to the amended and restated Credit Facility were$10.3 million, which were capitalized as deferred financing costs and are being amortized over the remaining term.

Pursuant to the amended and restated Credit Facility, the Company is required to use proceeds received from Aireon related to hosting fees to prepay the principal. As such, for the year ended December 31, 2018, the Company extinguished principal of$43.1 million, resulting in a$3.3 million loss on extinguishment of debt recorded within interest expense, representing premiums paid and the write-off of unamortized debt issuance costs. There were no prepayments or related interest expense during the year ended December 31, 2017.

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During the repayment period, interest is paid on the same date as the principal repayments.

The effective interest rate on outstanding principal of the Credit Facility was 6.6% during each of the years ended December 31, 2018, 2017 and 2016.

Under the terms of the Credit Facility, as of December 31, 2018, the Company is required to maintain a minimum cash reserve within the DSRA of$189.0 million, which is classified as restricted cash and cash equivalents on the accompanying consolidated balance sheet. The Credit Facility is scheduled to mature in September 2024, subject to acceleration as described below.

As of December 31, 2018, the DSRA balance was$191.9 million, which is classified as restricted cash and cash equivalents in our condensed consolidated balance sheet. This amount includes a minimum cash reserve for debt service related to the Credit Facility as well as the interest earned on these amounts. In addition to the minimum debt service levels, financial covenants under the Credit Facility, as amended to date, include:

• an available cash balance of at least$25 million;

• a debt-to-equity ratio, which is calculated as the ratio of total net debt to the aggregate of total net debt and total stockholders’ equity, of no more than0.7 to 1, measured each June 30 and December 31;

• specified maximum levels of annual capital expenditures (excluding expenditures on the construction of Iridium NEXT satellites) through the year ending December 31, 2024;

• a debt service coverage ratio of not less than1.5 to 1, measured each June 30 and December 31 through the year ending December 31, 2020, not less than1.25 to 1 for June 30 and December 31, 2021, and not less than1.5 to 1, for each June 30 and December 31 thereafter through 2024;

• specified maximum leverage levels that decline from a ratio of8.24 to 1 for the year ended December 31, 2018 to a ratio of2.00 to 1 for the year ending December 31, 2024; and

• a requirement that we receive at least$200.0 million in hosting fees from Aireon by December 31, 2023.

The Company's available cash balance, as defined by the Credit Facility, was$273.4 million as of December 31, 2018. The Company's debt-to-equity ratio was0.53 to 1 as of December 31, 2018. The Company's debt service coverage ratio was3.4 to 1 as of December 31, 2018, and the Company's leverage was5.9 to 1 for the year ended December 31, 2018. The Company was alsoin compliance with the annual capital expenditures covenant as of December 31, 2018.

The covenant regarding capital expenditures is calculated in connection with a measurement, which the Company refers to as available cure amount, that is derived using a complex calculation based on overall cash flows, as adjusted by numerous measures specified in the Credit Facility. In a period in which the Company's capital expenditures exceed the amount specified in the respective covenant, the Company would be permitted to allocate available cure amount, if any, to prevent a breach of the applicable covenant. As of December 31, 2018, the Company had an available cure amount of$62.5 million, although it was not necessary to apply any available cure amount to maintain compliance with the covenants. The available cure amount has fluctuated significantly from one measurement period to the next, and the Company expects that it will continue to do so.

The covenants also place limitations on the Company's ability and that of its subsidiaries to carry out mergers and acquisitions, dispose of assets, grant security interests, declare, make or pay dividends, enter into transactions with affiliates, incur additional indebtedness, or make loans, guarantees or indemnities. If the Company is not in compliance with the financial covenants under the Credit Facility, after any opportunity to cure such non-compliance, or the Company otherwise experiences an event of default under the Credit Facility, the lenders may require repayment in full of all principal and interest outstanding under the Credit Facility. It is unlikely the Company would have adequate funds to repay such amounts prior to the scheduled maturity of the Credit Facility. If the Company fails to repay such amounts, the lenders may foreclose on the assets it has pledged under the Credit Facility, which include substantially all of the Company's assets and those of its domestic subsidiaries.

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Senior Unsecured Notes

On March 21, 2018, the Company issued the Notes which bear interest at10.25% per annum and mature on April 15, 2023. Interest is payable semi-annually on April 15 and October 15 and principal is repaid in full upon maturity. Interest payments began on October 15, 2018. The proceeds of the Notes were used to prepay the outstanding Thales Alenia Space bills of exchange, including premiums paid, of approximately$59.9 million issued pursuant to the FSD, replenish the DSRA under the Credit Facility to$189.0 million, and to pay approximately$44.4 million in Thales Alenia Space milestones previously expected to be satisfied by the issuance of bills of exchange. The proceeds of the Notes also provided the Company with additional cash to meet its needs, including principal and interest payments under the Credit Facility and interest payments on the Notes. As of December 31, 2018, the Company reported an aggregate of$360.0 million in borrowings under the Notes, before$9.0 million of unamortized deferred financing costs, for a net principal balance of$351.0 million in borrowings in the accompanying consolidated balance sheet. As of December 31, 2018, based upon recent trading prices (Level 2 - market approach), the fair value of the Company's$360.0 million in borrowings under the Notes due in 2022 was$389.7 million. The Notes contain covenant requirements that apply to certain permitted financing actions, but the covenants under the Notes are no more restrictive than the covenants included in the Credit Facility. The Company was in compliance with all covenant requirements under the Notes as of December 31, 2018.

Total Debt

Total interest incurred during the years ended December 31, 2018, 2017 and 2016 was$142.7 million,$114.4 million and$106.4 million, respectively. Interest incurred includes amortization of deferred financing fees of$26.5 million,$27.3 million and$28.7 million for the years ended December 31, 2018, 2017 and 2016, respectively. Interest capitalized during the year ended December 31, 2018 was$76.7 million. During 2017 and 2016, all interest was capitalized. Also during 2016, paid-in-kind interest was$44.4 million with the remainder payable in cash on the scheduled semi-annual payment dates. Interest accrued for the years ended December 31, 2018 and 2017 was$29.4 million and$15.0 million, respectively.

Future minimum principal repayments with respect to the Company's debt balances existing at December 31, 2018 by year and in the aggregate, are as follows:

Year ending December 31,	Amount
	(In thousands)
2019	$	126,000
2020	216,000
2021	306,000
2022	666,000
2023	360,000
Thereafter	370,869
Total debt commitments	$	2,044,869
Less: Original issuance discount	89,132
Less: Total short-term debt	126,000
Total long-term debt, net	$	1,829,737

The repayment schedule above excludes the redemption of Iridium's equity interest in Aireon, Aireon dividends (when and if declared) and any hosting fees received from Aireon. The Company must apply100% of these Aireon receipts toward the prepayment of the Credit Facility, which may result in an earlier repayment. As stated above, if any of the Notes remain outstanding on October 15, 2022, which is six months prior to the scheduled maturity thereof, the maturity of all amounts remaining outstanding under the Credit Facility would be accelerated from September 30, 2024 to October 15, 2022. As such, the Company assumes full principal repayment of the Notes in 2022, prior to October 15, 2022.

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8. Boeing Insourcing Agreement

On January 3, 2017, the Company hired the majority of the employees and third-party contractors who were responsible for the operations and maintenance of the Company’s satellite constellation and ground infrastructure pursuant to an Insourcing Agreement with The Boeing Company ("Boeing"). The Company paid Boeing$5.5 million, of which$2.75 million was paid in each of December 2016 and December 2017. As a result, the Company and Boeing terminated their previous Operations and Maintenance Agreement (“O&M Agreement”) and Iridium NEXT Support Service Agreement and entered into a new DSA with a$6.0 million minimum annual commitment through 2021. Boeing no longer has a unilateral right to commence the de-orbit of the Company’s first-generation satellites. The acquisition of this assembled workforce was recorded as a definite-lived intangible asset in January 2017 and is being amortized over an estimated useful life of seven years. Additionally, by terminating the O&M Agreement, the Company recognized a$14.2 million gain in the first quarter of 2017, consisting of (i) the derecognition of a purchase accounting liability created when GHL Acquisition Corp. acquired Iridium Holdings LLC in 2009 related to the fair value of the contractual arrangement with Boeing as of that date, and (ii) the remainder of a credit resulting from a July 2010 Boeing contract amendment.

The Company incurred expenses of$28.1 million,$30.5 million and$29.0 million relating to satellite operations and maintenance costs for the years ended December 31, 2018, 2017 and 2016, respectively, which include internal costs and amounts paid to Boeing, and are included in cost of services (exclusive of depreciation and amortization) in the consolidated statements of operations and comprehensive income.

9. Stock-Based Compensation

In May 2017, the Company’s stockholders approved the amendment and restatement of the Company's 2015 Equity Incentive Plan (as so amended and restated, the “Amended 2015 Plan”), primarily to increase the number of shares available under the plan. The Company registered with the SEC an additional5,199,239 shares of common stock made available for issuance pursuant to the Amended 2015 Plan, bringing the total to28,402,248 shares registered. Through December 31, 2018, the remaining aggregate number of shares of the Company's common stock available for future grants under the Amended 2015 plan was8,569,642. The Amended 2015 Plan provides for the grant of stock-based awards, including nonqualified stock options, incentive stock options, restricted stock, RSUs, stock appreciation rights and other equity securities as incentives and rewards for employees, consultants and non-employee directors of the Company and its affiliated entities. The number of shares of common stock available for issuance under the Amended 2015 Plan is reduced by (i) one share for each share of common stock issued pursuant to an appreciation award, such as a stock option or stock appreciation right with an exercise or strike price of at least100% of the fair market value of the underlying common stock on the date of grant, and (ii)1.8 shares for each share of common stock issued pursuant to any stock award that is not an appreciation award, also known as a “full value award.” The Amended 2015 Plan allows the Company to utilize a broad array of equity incentives and performance cash incentives in order to secure and retain the services of its employees, directors and consultants, and to provide long-term incentives that align the interests of its employees, directors and consultants with the interests of the Company’s stockholders. The Company accounts for stock-based compensation at fair value.

Stock Option Awards

The fair value of stock options is determined at the grant date using the Black-Scholes option pricing model. The stock option awards granted to employees generally (i) have a term of ten years, (ii) vest over a four-year period with 25% vesting after the first year of service and the remainder vesting ratably on a quarterly basis thereafter, (iii) are contingent upon employment on the vesting date, and (iv) have an exercise price equal to the fair value of the underlying shares at the date of grant.

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Fair Value Determination

We have used the Black-Scholes-Merton option pricing model to determine fair value of our stock option awards on the date of grant. We will reconsider the use of the Black-Scholes-Merton model if additional information becomes available in the future that indicates another model would be more appropriate or if grants issued in future periods have characteristics that cannot be reasonably estimated under this model.

The following weighted-average assumptions were used for option grants during the years ended December 31, 2018, 2017 and 2016:

• Volatility - The expected volatility of the options granted was estimated based upon historical volatility of the Company's share price of its common stock through daily observations of its trading history.

• Expected life of options - The expected life of options granted to employees was determined from the simplified method.

• Risk-free interest rate - The yield on zero-coupon U.S. Treasury strips was used to extrapolate a forward-yield curve. This “term structure” of future interest rates was then input into a numeric model to provide the equivalent risk-free rate to be used in the Black-Scholes-Merton model based on the expected term of the underlying grants.

• Dividend yield - The Black-Scholes-Merton valuation model requires an expected dividend yield as an input. The Company does not anticipate paying dividends during the expected term of the grants; therefore, the dividend rate is assumed to be zero.

The Company now grants stock options to newly hired and promoted employees only. During 2018, 2017 and 2016, the Company granted approximately364,000,209,000 and249,000 stock options, respectively, with an estimated aggregate grant date fair value of$2.4 million,$0.9 million and$0.9 million, respectively.

The following table summarizes weighted-average assumptions used in the Company's calculations of fair value:

	Year Ended December 31,
	2018	2017	2016
Expected volatility	39.53%	41.11%	41.36%
Expected term (years)	6.11	6.25	6.25
Expected dividends	—%	—%	—%
Risk free interest rate	2.68%	1.92%	1.68%

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A summary of the activity of the Company’s stock options is as follows:

	Shares		Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
	(In thousands, except years and per share data)
Options outstanding at December 31, 2015	7,120		$	7.86
Granted	249		8.13
Cancelled or expired	(39	)	8.92
Exercised	(73	)	7.33
Forfeited	(55	)	7.62
Options outstanding at December 31, 2016	7,202		$	7.87	5.45	$	12,473
Granted	209		10.50
Cancelled or expired	(2	)	7.24
Exercised	(534	)	7.93
Forfeited	(19	)	9.13
Options outstanding at December 31, 2017	6,856		$	7.94	4.63	$	26,459
Granted	364		15.56
Cancelled or expired	(1	)	8.59
Exercised	(1,477	)	8.42
Forfeited	(39	)	9.97
Options outstanding at December 31, 2018	5,703		$	8.29	4.38	$	57,956
Options exercisable at December 31, 2018	5,095		$	7.72	3.87	$	54,694
Options exercisable and expected to vest at December 31, 2018	5,687		$	8.27	4.37	$	57,891

The Company recognized$1.5 million,$1.8 million and$2.5 million of stock-based compensation expense related to stock options in the years ended December 31, 2018, 2017 and 2016, respectively.

The weighted-average grant date fair value of options granted during the years ended December 31, 2018, 2017 and 2016 was$6.63,$4.51 and$3.47 per share, respectively. The total fair value of the shares vested during the years ended December 31, 2018, 2017 and 2016 was$1.4 million,$2.0 million and$2.9 million, respectively.

As of December 31, 2018, the total unrecognized cost related to non-vested options was approximately$2.9 million. This cost is expected to be recognized over a weighted-average period of2.7 years.

Restricted Stock Units

The RSUs granted to employees for service vest over a four-year period, with25% vesting on the first anniversary of the grant date and the remainder vesting ratably on a quarterly basis thereafter, subject to continued employment. The RSUs granted to non-employee directors generally vest in full on the first anniversary of the grant date. The RSUs granted to non-employee consultants generally vest50% on the first anniversary of the grant date and ratably on a quarterly basis through the second anniversary of the grant date. Some RSUs granted to employees for performance vest upon the completion of defined performance goals, subject to continued employment. The Company’s RSUs are generally classified as equity awards because the RSUs will be paid in the Company's common stock upon vesting. The related compensation expense is recognized over the service period and is based on the grant date fair value of the Company's common stock and the number of shares expected to vest. The fair value of the awards is not remeasured at the end of each reporting period. The awards do not carry voting rights until they are vested and released in accordance with the terms of the award.

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Service-Based Awards

The majority of the annual compensation the Company provides to members of its board of directors is paid in the form of RSUs. In addition, certain members of the Company’s board of directors elect to receive the remainder of their annual compensation, or a portion thereof, in the form of RSUs. An aggregate amount of approximately110,000,96,000 and126,000 service-based RSUs were granted to its directors as a result of these elections during the years ended December 31, 2018, 2017 and 2016, respectively, with an estimated grant date fair value of$1.3 million,$1.0 million and$1.0 million, respectively.

During the years ended December 31, 2018, 2017 and 2016, the Company granted approximately900,000,964,000 and573,000 service-based RSUs, respectively, to its employees, with an estimated grant date fair value of$10.7 million,$8.5 million and$4.0 million, respectively.

During the years ended December 31, 2018, 2017 and 2016, the Company granted approximately14,000,8,000 and35,000 service-based RSUs, respectively, to non-employee consultants with an estimated grant date fair value of$0.2 million,$0.1 million and$0.3 million, respectively.

Performance-Based Awards

In March 2018, 2017 and 2016, the Company awarded approximately474,000,1,190,000 and1,335,000 performance-based RSUs, respectively, to the Company’s executives and employees (the “Bonus RSUs”), with an estimated grant date fair value of$5.6 million,$10.5 million and$9.4 million, respectively. Vesting of the Bonus RSUs is and was dependent upon the Company’s achievement of defined performance goals over the respective fiscal year. The Company records stock-based compensation expense related to performance-based RSUs when it is considered probable that the performance conditions will be met. Management believes it is probable that substantially all of the 2018 Bonus RSUs will vest. The level of achievement, if any, of performance goals will be determined by the compensation committee of the Company’s board of directors and, if such goals are achieved, the 2018 Bonus RSUs will vest, subject to continued employment, in March 2019. A portion of the March 2017 Bonus RSUs vested in March 2018 upon the determination of the level of achievement of the performance goals.

Additionally, during 2018, 2017 and 2016, the Company awarded approximately134,000,173,000 and119,000 performance-based RSUs, respectively, to the Company’s executives (the “Executive RSUs”). The estimated aggregate grant date fair values of the Executive RSUs granted in 2018, 2017 and 2016 was$1.6 million,$1.5 million and$0.8 million, respectively. Vesting of the Executive RSUs is and was dependent upon the Company’s achievement of defined performance goals over a two-year period. Management believes it is probable that the Executive RSUs will vest at least in part. The vesting of Executive RSUs will ultimately range from0% to150% of the number of shares underlying the Executive RSU grant based on the level of achievement of the performance goals. If the Company achieves the performance goals,50% of the Executive RSUs will vest on the second anniversary of the grant date and the remaining50% will vest on the third anniversary of the grant date, in each case, subject to the executive's continued service as of the vesting date.

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Award Summary

A summary of the Company’s activity for outstanding RSUs is as follows:

	RSUs		Weighted- Average Grant Date Fair Value Per RSU
	(In thousands)
Outstanding at December 31, 2015	1,944		$	7.76
Granted	2,297		$	7.09
Forfeited	(152	)	$	7.44
Released	(766	)	$	7.36
Outstanding at December 31, 2016	3,323		$	7.40
Granted	2,431		$	8.89
Forfeited	(203	)	$	8.42
Released	(2,003	)	$	7.16
Outstanding at December 31, 2017	3,548		$	8.50
Granted	1,632		$	11.87
Forfeited	(163	)	$	9.69
Released	(1,940	)	$	8.64
Outstanding at December 31, 2018	3,077		$	10.13
Vested and unreleased at December 31, 2018 (1)	617

⁽¹⁾ These RSUs were granted to the Company's board of directors as a part of their compensation for board and committee service and had vested but had not yet been issued and released.

As of December 31, 2018, the total unrecognized cost related to non-vested RSUs was approximately$9.5 million. This cost is expected to be recognized over a weighted-average period of1.32 years. The Company recognized$15.2 million,$17.0 million and$13.5 million of stock-based compensation expense related to RSUs in the years ended December 31, 2018, 2017 and 2016, respectively.

10. Preferred Stock

The Company is authorized to issue2.0 million shares of preferred stock with a par value of$0.0001 per share. As described below, the Company issued1.0 million shares of preferred stock in the fourth quarter of 2012 and0.5 million shares of preferred stock in the second quarter of 2014. The remaining0.5 million authorized shares of preferred stock were undesignated and unissued as of December 31, 2018.

Series A Cumulative Perpetual Convertible Preferred Stock

In the fourth quarter of 2012, the Company issued1.0 million shares of its7.00% Series A Cumulative Perpetual Convertible Preferred Stock (the "Series A Preferred Stock") in a private offering.

During the three months ended March 31, 2018, the Company's daily volume-weighted average stock price remained at or above$12.26 per share for a period of 20 out of 30 trading days, thereby allowing for the conversion of the Series A Preferred Stock at the election of the Company. On March 20, 2018, the Company converted all outstanding shares of its Series A Preferred Stock into shares of common stock, resulting in the issuance of10,599,974 shares of common stock. The Company declared and paid all current and cumulative dividends to holders of record of Series A Preferred Stock as of March 8, 2018. As such, the Company paid cash dividends of$7.0 million to the holders of the Series A Preferred Stock. The Company paid cash dividends of$1.8 million to the holders of the Series A Preferred Stock during the year ended December 31, 2017.

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Series B Cumulative Perpetual Convertible Preferred Stock

In May 2014, the Company issued500,000 shares of its Series B Cumulative Perpetual Convertible Preferred Stock (the "Series B Preferred Stock") in an underwritten public offering at a price to the public of$250 per share. The purchase price received by the Company, equal to$242.50 per share, reflected an underwriting discount of$7.50 per share. The Company received proceeds of$120.8 million from the sale of the Series B Preferred Stock, net of the$3.8 million underwriting discount and$0.4 million of offering costs.

As of December 31, 2018, there were497,000 shares of Series B Preferred Stock outstanding. Holders of Series B Preferred Stock are entitled to receive cumulative cash dividends at a rate of6.75% per annum of the$250 liquidation preference per share (equivalent to an annual rate of$16.875 per share). Dividends are payable quarterly in arrears on each March 15, June 15, September 15 and December 15. The Series B Preferred Stock does not have a stated maturity date and is not subject to any sinking fund or mandatory redemption provisions. The Series B Preferred Stock ranks senior to the Company’s common stock with respect to dividend rights and rights upon the Company’s voluntary or involuntary liquidation, dissolution or winding-up. Holders of Series B Preferred Stock generally have no voting rights except for limited voting rights if the Company fails to pay dividends for six or more quarterly periods (whether or not consecutive) and in other specified circumstances. Holders of Series B Preferred Stock may convert some or all of their outstanding Series B Preferred Stock at an initial conversion rate of33.456 shares of common stock per$250 liquidation preference, which is equivalent to an initial conversion price of approximately$7.47 per share of common stock (subject to adjustment in certain events).

In connection with the conversion of the Series A Preferred Stock described above, the Company declared and paid all current and cumulative dividends to holders of record of Series B Preferred Stock as of March 8, 2018. The Company paid cash dividends of$8.4 million to holders of the Series B Preferred Stock during the year ended December 31, 2018. In compliance with the Credit Facility, subsequent to the$8.4 million dividend payment, the Company began the planned suspension of dividends to holders of the Series B Preferred Stock for five quarters, beginning with the dividend payment that otherwise would have been paid on June 15, 2018. The Company paid cash dividends of$2.1 million to holders of the Series B Preferred Stock during the year ended December 31, 2017.

On or after May 15, 2019, the Company may, at its option, convert some or all of the Series B Preferred Stock into the number of shares of common stock that are issuable at the then-applicable conversion rate, subject to specified conditions, including (i) a daily volume-weighted average stock price of at least$11.21 per share over a period of 20 trading days in a 30-day period and (ii) the payment of cumulative dividends. In the event of certain specified fundamental changes, holders of the Series B Preferred Stock will have the right to convert some or all of their shares of Series B Preferred Stock into the greater of (i) a number of shares of the Company’s common stock as subject to adjustment plus the make-whole premium, if any, and (ii) a number of shares of the Company’s common stock equal to the lesser of (a) the liquidation preference divided by the market value of the Company’s common stock on the effective date of such fundamental change and (b)81.9672 (subject to adjustment). In certain circumstances, the Company may elect to cash settle any conversions in connection with a fundamental change. Any suspended dividends are required to be paid prior to conversion by the Company.

11. Revenue

Effective January 1, 2018, the Company adopted ASU No. 2014-09. Under the new standard, the Company performs the following steps to determine the amount of revenue to be recognized: (i) identification of the promised goods or services in the contract; (ii) determination of whether the promised goods or services are performance obligations including whether they are distinct in the context of the contract; (iii) measurement of the transaction price, including the constraint on variable consideration; (iv) allocation of the transaction price to the performance obligations; and (v) recognition of revenue when (or as) the Company satisfies each performance obligation. The Company only applies the five-step model to contracts when it is probable that it will collect the consideration it is entitled to in exchange for the goods or services it transfers to the customer.

In addition, the standard requires disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The Company adopted the standard using the modified retrospective method with a cumulative effect adjustment recorded to reduce opening retained earnings by$15.7 million. This method required application of the new guidance at the beginning of the earliest comparative period presented for revenue agreements that were not substantially complete as of the date of adoption. The Company does not disclose the value of unsatisfied performance obligations because the majority of its contracts have expected lengths of one year or less. The Company did not retrospectively restate contracts with modifications prior to the earliest period presented, but instead reflected the aggregate effect of all modifications at transition.

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The Company derives its revenue primarily as a wholesaler of satellite communications products and services. Pursuant to wholesale agreements, the Company sells its products and services to service providers who, in turn, sell the products and services to other distributors or directly to the end users. The primary types of revenue include (i) service revenue (access and usage-based airtime fees), (ii) subscriber equipment revenue, and (iii) revenue generated by providing engineering and support services to commercial and government customers. See Note 2 for a description of the Company's accounting policies in connection with each of these types of arrangements.

The following table summarizes the Company’s services revenue:

	Year Ended December 31,
	2018		2017		2016
	(in thousands)
Commercial voice and data services	$	193,176	$	177,685	$	177,666
Commercial IoT data services	85,054		74,142		65,523
Hosted payload and other data services	40,527		9,908		3,633
Government services	88,000		88,000		88,000
Total services	$	406,757	$	349,735	$	334,822

The following table summarizes the Company’s engineering and support services revenue:

	Year Ended December 31,
	2018		2017		2016
	(in thousands)
Commercial	$	716	$	3,109	$	2,245
Government	17,687		18,083		22,362
Total	$	18,403	$	21,192	$	24,607

The timing of revenue recognition, billings and cash collections results in billed accounts receivable, unbilled receivables (contract assets), and deferred revenue (contract liabilities) on the condensed consolidated balance sheets. The Company bills amounts under its agreed-upon contractual terms at periodic intervals (for services), upon shipment (for equipment), or upon achievement of contractual milestones or as work progresses (for engineering and support services). Billing may occur subsequent to revenue recognition, resulting in accounts receivable (contract assets). The Company may also receive payments from customers before revenue is recognized, resulting in deferred revenue (contract liabilities). The Company recognized revenue that was previously recorded as deferred revenue in the amounts of$18.0 million and$22.7 million for the years ended December 31, 2018 and 2017, respectively. The Company has also recorded costs of obtaining contracts expected to be recovered in prepaid expenses and other assets (contract assets or commissions), that are not separately disclosed on the condensed consolidated balance sheets. The commissions are recognized over the estimated prepaid usage period. The contract assets not separately disclosed are as follows:

	Year Ended December 31,
	2018		2017
	(in thousands)
Contract Assets:
Commissions	$	1,010	$	1,555
Other contract costs	$	3,631	$	3,753

The primary impact of adopting ASU 2014-09 relates to the Company’s prepaid service revenue and associated breakage. Under the new standard, the Company now estimates the expected revenue that will expire unused on an ongoing basis and recognizes this revenue in a manner consistent with the usage period. Upon adoption, the contract liability (deferred revenue associated with prepaid service revenue) was reduced by approximately$15.7 million as a result of the change to include a breakage estimate over the usage period.

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Adopting the new standard had an immaterial impact on the Company’s financial statements. The impact of the implementation of the new revenue standard on the Company's condensed consolidated balance sheets, as compared to accounting under prior revenue guidance (Accounting Standards Codification ("ASC") Topic 605), was as follows:

	December 31, 2018
	As reported		Adjustment			Pro forma under ASC 605
	(in thousands)
Prepaid expenses and other current assets	$	18,284	$	527		$	18,811
Deferred revenue	37,429		19,771			57,200
Deferred revenue, net of current portion	74,656		(2,782		)	71,874
Other long-term liabilities	4,160		(3,975		)	185
Retained earnings	$	501,712	$	(12,487	)	$	489,225

The impact of the implementation of the new standard on the Company's condensed consolidated statements of operations and comprehensive income (loss) was as follows:

	Year Ended December 31, 2018
	As reported			Adjustment			Pro forma under ASC 605
	(in thousands)
Service revenue	$	406,757		$	(1,304	)	$	405,453
Cost of services	86,016			(144		)	85,872
Loss before income taxes	(20,649		)	(1,160		)	(21,809		)
Income tax benefit	7,265			411			7,676
Net loss	$	(13,384	)	$	(749	)	$	(14,133	)

12. Income Taxes

U.S. and foreign components of income before income taxes are presented below:

	Year Ended December 31,
	2018			2017			2016
				(In thousands)
U.S. income (loss)	$	(22,147	)	$	120,281		$	176,448
Foreign income (loss)	1,498			(709		)	1,717
Total income (loss) before income taxes	$	(20,649	)	$	119,572		$	178,165

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The components of the Company’s income tax provision were as follows:

	Year Ended December 31,
	2018			2017			2016
				(In thousands)
Current taxes:
Federal tax expense	$	17		$	13		$	1,206
State tax expense	(91		)	422			978
Foreign tax expense	1,163			863			1,141
Total current tax expense	1,089			1,298			3,325
Deferred taxes:
Federal tax expense (benefit)	(9,159		)	(110,811		)	60,295
State tax expense (benefit)	904			(4,851		)	3,454
Foreign tax expense (benefit)	(99		)	80			59
Total deferred tax expense (benefit)	(8,354		)	(115,582		)	63,808
Total income tax expense (benefit)	$	(7,265	)	$	(114,284	)	$	67,133

On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (the “Tax Act”) was signed into law making significant changes to the Internal Revenue Code. Changes include, but are not limited to, a corporate tax rate decrease from35% to21% effective for tax years beginning after December 31, 2017, the transition of U.S international taxation from a worldwide tax system to a territorial system, and a one-time transition tax on the mandatory deemed repatriation of cumulative foreign earnings as of December 31, 2017.

The Securities and Exchange Commission issued Staff Accounting Bulletin No. 118 ("SAB 118") to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Tax Act. SAB 118 was effective for reporting periods that include December 22, 2017. Due to the timing of the enactment and the complexity involved in applying the provisions of the Tax Act, the Company made reasonable estimates of the effects of the Tax Act and recorded provisional amounts in its December 31, 2017 financial statements including the remeasurement of its deferred tax assets/liabilities for an estimated net tax benefit of$150.9 million, as well as an estimated one time taxable income amount of$2.3 million for the deemed repatriation of certain foreign subsidiary untaxed earnings with an estimated deferred tax asset of$0.8 million associated with foreign taxes deemed paid on those earnings. In the fourth quarter of 2018, the Company completed its accounting for the income tax effects of the Tax Act. No material adjustments were required to the provisional amounts initially recorded.

Remeasurement of deferred tax assets/liabilities: In the fourth quarter of 2018, the Company finalized its accounting for the net deferred tax benefit of$150.4 million related to the remeasurement of certain deferred tax assets and liabilities as of December 31, 2017. The Company remeasured those deferred tax assets and liabilities at21%, because this is the rate at which it expects these items to reverse.

Deemed Repatriation of Certain Foreign Subsidiary Earnings: The Tax Act required the Company to increase its 2017 U.S. taxable income for the mandatory deemed repatriation of accumulated foreign subsidiary earnings not previously subject to U.S. income tax at a rate of15.5% to the extent of foreign cash and certain other net current assets and8% on the remaining untaxed earnings. The Company finalized its accounting for this one-time taxable income amount of$3.2 million, with a deferred tax asset associated with foreign taxes deemed paid on those earnings of$0.8 million.

In April 2018, Maryland enacted the single sales factor method for apportioning income to the state to be phased in over five years commencing in 2018. This change results in higher future Maryland state income taxes for the Company, increasing its 2018 income tax provision by$7.0 million for the impact on its existing deferred tax assets and liabilities. If the Company's current estimates change in future periods, the impact on the deferred tax assets and liabilities may change correspondingly.

In 2011 and 2012, Arizona enacted tax law changes resulting in a benefit to the Company’s net deferred tax expense. Due to the size and nature of the Company’s operations in Arizona, such changes have a significant impact on the tax provision in a given period. As a result of this law changes, the Company’s deferred tax expense was reduced by approximately$13.5 million,$10.2 million and$3.0 million for the years ended December 31, 2018, 2017 and 2016 respectively.

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A reconciliation of the U.S. federal statutory income tax expense to the Company’s effective income tax provision is below. Any amounts that do not have a meaningful impact on this reconciliation are not separately disclosed.

	Year Ended December 31,
	2018			2017			2016
				(In thousands)
Expected tax expense (benefit) at U.S. federal statutory tax rate	$	(4,336	)	$	41,850		$	62,309
State taxes, net of federal benefit	(3,361		)	5,133			9,757
State tax valuation allowance	10,651			582			(2,710		)
Deferred impact of state tax law changes and elections	(6,481		)	(10,217		)	(2,962		)
Tax Act - deferred tax effects	—			(150,903		)	—
Equity-based compensation	(3,807		)	(977		)	—
Limitation on executive compensation deduction	1,568			26			—
Other nondeductible items	298			110			596
Tax credits	(2,872		)	(528		)	(442		)
Foreign taxes and other adjustments	1,075			640			585
Total income tax expense (benefit)	$	(7,265	)	$	(114,284	)	$	67,133

The components of deferred tax assets and liabilities are as follows:

	December 31,
	2018			2017
	(In thousands)
Deferred tax assets
Long-term contracts	$	70,518		$	61,358
Federal, state and foreign net operating loss carryforwards and tax credits	277,678			107,566
Other	20,002			22,680
Total deferred tax assets	368,198			191,604
Valuation allowance	(14,174		)	(3,815		)
Net deferred tax assets	354,024			187,789
Deferred tax liabilities
Fixed assets, intangibles and research and development expenditures	(529,037		)	(403,545		)
Investment in joint venture	(57,686		)	(27,796		)
Other	(8,357		)	(2,276		)
Total deferred tax liabilities	(595,080		)	(433,617		)
Net deferred income tax liabilities	$	(241,056	)	$	(245,828	)

Pursuant to ASC 740, the Company nets deferred tax assets and liabilities within the same jurisdiction. As of December 31, 2018, the Company had a net deferred tax asset of$0.4 million that is included in other assets on the balance sheet and a net deferred tax liability of$241.4 million.

The Company recognizes valuation allowances to reduce deferred tax assets to the amount that is more likely than not to be realized. In assessing the likelihood of realization, management considers: (i) future reversals of existing taxable temporary differences; (ii) future taxable income exclusive of reversing temporary differences and carryforwards; (iii) taxable income in prior carryback year(s) if carryback is permitted under applicable tax law; and (iv) tax planning strategies.

The Company had deferred tax assets related to cumulative U.S. federal net operating loss carryforwards of approximately$219.6 million and$80.5 million as of December 31, 2018 and 2017, respectively. The pre-2018 U.S. federal net operating loss carryforwards if unutilized, will expire in various amounts from 2031 through 2037. Pursuant to the Tax Act, the 2018 U.S. federal net operating loss carryforwards do not expire. The Company believes that the U.S. federal net operating losses will be utilized before the expiration dates and, as such, no valuation allowance has been established for these deferred tax assets. The

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Company had deferred tax assets related to the state net operating loss carryforwards of approximately$36.7 million and$10.9 million as of December 31, 2018 and 2017, respectively, that expire from 2025 through 2038. The Company does not expect to fully utilize all of its state net operating losses within the respective carryforward periods and as such reflects a partial valuation allowance of$11.4 million and$0.7 million as of December 31, 2018 and 2017, respectively, against these deferred tax assets on its consolidated balance sheet. The Company had deferred tax assets related to the foreign net operating loss carryforwards of approximately$0.9 million and$1.3 million as of December 31, 2018 and 2017, respectively, that begin to expire in 2023. The Company does not expect to fully utilize all of its foreign net operating losses within the carryforward periods and as such reflects a partial valuation allowance against these deferred tax assets on its consolidated balance sheet. The timing and manner in which the Company will utilize the net operating loss carryforwards in any year, or in total, may be limited in the future as a result of changes in the Company’s ownership and any limitations imposed by the jurisdictions in which the Company operates.

The Company has approximately$8.4 million and$6.1 million of deferred tax assets related to research and development tax credits as of December 31, 2018 and 2017, respectively, that expire in various amounts from 2029 through 2038. The Company has approximately$5.2 million and$4.7 million of deferred tax assets related to foreign tax credits as of December 31, 2018 and 2017, respectively, that expire in various amounts from 2020 through 2028. The Company has$3.6 million and$3.8 million of deferred tax assets related to Alternative Minimum Tax credits as of December 31, 2018 and 2017, respectively, which do not expire. Under the Tax Act, the Alternative Minimum Tax credits will convert to refunds if not used as a credit. The Company believes that the research and development credits will be fully utilized within the carryforward period. However, the Company does not expect to utilize all of its foreign tax credits within the respective carryforward periods. As such, the Company has a partial valuation allowance of$1.1 million as of December 31, 2018, which is unchanged from December 31, 2017.

The Company has provided for U.S. income taxes on all undistributed earnings of its significant foreign subsidiaries since the Company does not indefinitely reinvest these undistributed earnings. The Company measures deferred tax assets and liabilities using tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The Company recognizes the effect on deferred tax assets and liabilities of a change in tax rates in income in the period that includes the enactment date.

Uncertain Income Tax Positions

The Company is subject to income taxes in the U.S. and various state and foreign jurisdictions. Significant judgment is required in evaluating tax positions and determining the provision for income taxes. The Company establishes liabilities for tax-related uncertainties based on estimates of whether, and the extent to which, additional taxes may be due. These liabilities are established when the Company believes that certain positions might be challenged despite its belief that its tax return positions are fully supportable. The Company adjusts these liabilities in light of changing facts and circumstances, such as the outcome of a tax audit. The provision for income taxes includes the impact of changes to these liabilities.

The amount of unrecognized tax benefits was$1.1 million and$1.0 million at December 31, 2018 and 2017, respectively. Any changes in the next twelve months are not anticipated to have a significant impact on the results of operations, financial position or cash flows of the Company. All of the Company’s uncertain tax positions, if recognized, would affect its income tax expense.

The Company has elected an accounting policy to classify interest and penalties related to unrecognized tax benefits as a component of income tax expense. As of December 31, 2018 and 2017, potential interest and penalties on unrecognized tax benefits were not significant.

The Company is subject to tax audits in all jurisdictions for which it files tax returns. Tax audits by their very nature are often complex and can require several years to complete. Currently, there are no U.S. federal, state or foreign jurisdiction tax audits pending. The Company’s corporate U.S. federal and state tax returns from 2010 to 2017 remain subject to examination by tax authorities and the Company’s foreign tax returns from 2011 to 2017 remain subject to examination by tax authorities.

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The following is a tabular reconciliation of the total amounts of unrecognized tax benefits which includes related interest and penalties:

	2018		2017
	(In thousands)
Balance at January 1,	$	1,046	$	920
Change attributable to tax positions taken in a prior period	50		146
Change attributable to final assessment	—		(27		)
Change attributable to tax positions taken in the current period	16		10
Decrease attributable to lapse of statute of limitations	—		(3		)
Balance at December 31,	$	1,112	$	1,046

13. Net Income (Loss) Per Share

The computations of basic and diluted net income (loss) per share are set forth below:

	Year Ended December 31,
	2018			2017			2016
	(In thousands, except per share data)
Numerator:
Net income (loss) attributable to common stockholders (numerator for basic net income per share)	$	(23,533	)	$	218,420		$	95,596
Net (income) loss allocated to participating securities	—			(215		)	(123		)
Numerator for basic net income (loss) per share	(23,533		)	218,205			95,473
Dividends on Series A preferred stock, declared and undeclared	—			7,000			7,000
Dividends on Series B preferred stock, declared and undeclared	—			8,436			8,436
Numerator for diluted net income (loss) per share	$	(23,533	)	$	233,641		$	110,909
Denominator: Denominator for basic net income (loss) per share - weighted   average outstanding common shares	108,975			97,934			95,967
Dilutive effect of stock options	—			1,558			250
Dilutive effect of Performance RSUs	—			1,308			1,328
Dilutive effect of Series A preferred stock	—			10,602			10,602
Dilutive effect of Series B preferred stock	—			16,728			16,728
Denominator for diluted net income (loss) per share	108,975			128,130			124,875
Net income (loss) per share attributable to common stockholders - basic	$	(0.22	)	$	2.23		$	1.00
Net income (loss) per share attributable to common stockholders - diluted	$	(0.22	)	$	1.82		$	0.89

For the year ended December 31, 2018,0.7 million unvested performance-based RSUs were not included in the computation of basic and diluted net income per share, as certain performance criteria have not been satisfied, and options to purchase0.1 million shares of common stock were not included in the computation of basic and diluted net loss per share, as the effect would be anti-dilutive. Due to the Company’s net loss for the year ended December 31, 2018, all potential common stock equivalents were anti-dilutive. For the year ended December 31, 2018, 16.7 million as-if converted shares of the Series B Preferred Stock were not included in the computation of diluted net loss per share, as the effect would be anti-dilutive.

For the year ended December 31, 2017,2.1 million unvested service-based RSUs were excluded from the computation of basic net income per share and not included in the computation of diluted net income per share, as the effect would be anti-dilutive, and0.2 million unvested performance-based RSUs were not included in the computation of basic and diluted net income per share, as certain performance criteria have not been satisfied. For the year ended December 31, 2016, options to purchase3.2 million shares of common stock were not included in the computation of diluted net income per share, as the effect would be

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anti-dilutive, and1.4 million unvested service-based RSUs were excluded from the computation of basic net income per share and not included in the computation of diluted net income per share, as the effect would be anti-dilutive.

For the year ended December 31, 2018,$6.3 million in cumulative unpaid dividends to holders of the Series B Preferred Stock was not declared or accrued as a result of all cash dividends being suspended in connection with the amendments to the Credit Facility described in Note 7, but such amounts were deducted to arrive at net loss attributable to common stockholders. For the year ended December 31, 2017,$5.3 million and$6.3 million in cumulative unpaid dividends to holders of the Series A Preferred Stock and Series B Preferred Stock, respectively, were not declared or accrued as a result of all cash dividends being suspended, but such amounts were deducted to arrive at net income attributable to common stockholders.

14. Related Party Transactions

Aireon LLC

The Iridium NEXT constellation hosts the Aireon system, which will provide a global air traffic surveillance service through a series of automatic dependent surveillance-broadcast ("ADS-B") receivers on the Iridium NEXT satellites. Iridium formed Aireon LLC ("Aireon") in 2011, with subsequent investments from the air navigation service providers ("ANSPs") of Canada, Italy, Denmark, Ireland and the United Kingdom, to develop and market this service. Aireon has contracted to pay Iridium a fee to host the ADS-B receivers on Iridium NEXT, as well as data service fees for the delivery of the air traffic surveillance data over the Iridium NEXT system. Pursuant to agreements with Aireon, Aireon will pay Iridium fees of$200.0 million to host the ADS-B receivers on Iridium NEXT and additional power fees of approximately$2.8 million per year (the "Hosting Agreement"), as well as data services fees of up to approximately$19.8 million per year for the delivery of the air traffic surveillance data over the Iridium NEXT system (the "Data Services Agreement"). The Aireon ADS-B receivers on the Iridium NEXT satellites are activated on an individual basis as the Iridium NEXT satellite begins carrying traffic.

At December 31, 2018, the Company had a fully diluted ownership stake in Aireon's holding company, Aireon Holdings LLC, of approximately35.7%, subject to certain redemption provisions contained in the Aireon Holdings LLC Amended and Restated Limited Liability Company Agreement (the "Aireon Holdings LLC Agreement").

Under the Hosting Agreement, the$200.0 million due is interest-bearing for amounts not paid on time. The Company had previously determined there was not sufficient support that Aireon will be able to make the payments due under the Hosting Agreement. During 2018, the Company and Aireon amended certain terms of the Hosting Agreement. As amended, the Company is scheduled to receive minimum payments corresponding to hosting services rendered. The first payment of$8.1 million was received during the second quarter of 2018. In December 2018, Aireon entered into a credit facility that resulted in settlement of$35.0 million in hosting receivables, paid directly to the Company's Credit Facility lenders by Aireon. Cumulative consideration for the year ended December 31, 2018 was approximately$43.1 million. No similar amounts were settled in previous years under the Hosting Agreement. Aireon continues to be obligated to pay the Company in full the remaining portion of the$200.0 million in hosting fees when Aireon is able to raise funds to do so. As a result of the amendment and an updated financial collectability assessment, as of December 31, 2018, the Company recognized$13.9 million of revenue related to total cumulative hosting services rendered to date.

Under the Data Services Agreement, Aireon pays the Company monthly data service payments on a per satellite basis beginning on each satellite's in-service date. The Company recorded data service revenue from Aireon of$9.1 million for the year ended December 31, 2018. Revenues recorded for the year ended December 31, 2017 were immaterial.

Under two services agreements, the Company also provides administrative services and support services, including services relating to Aireon's hosted payload operations center to Aireon, which are paid monthly. The Company also subleases office space to Aireon. Aireon receivables due to the Company under all agreements totaled$1.0 million and$0.6 million at December 31, 2018 and 2017, respectively.

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15. Segments, Significant Customers, Supplier and Service Providers and Geographic Information

The Company operates in one business segment, providing global satellite communications services and products.

The Company derived approximately20%,24% and25% of the Company’s total revenue in the years ended December 31, 2018, 2017 and 2016, respectively, from prime contracts or subcontracts with agencies of the U.S. government. For the years ended December 31, 2018, 2017 and 2016, no single commercial customer accounted for more than10% of the Company’s total revenue.

Approximately34% and35% of the Company’s accounts receivable balance at December 31, 2018 and 2017, respectively, was due from prime contracts or subcontracts with agencies of the U.S. government. As of December 31, 2018 and 2017, no single commercial customer accounted for more than10% of the Company’s total accounts receivable balance.

The Company contracts for the manufacture of its subscriber equipment primarily from a limited number of manufacturers and utilizes other sole source suppliers for certain component parts of its devices. Should events or circumstances prevent the manufacturer or the suppliers from producing the equipment or component parts, the Company’s business could be adversely affected until the Company is able to move production to other facilities of the manufacturer or secure a replacement manufacturer or an alternative supplier for such component parts.

Net property and equipment by geographic area was as follows:

	December 31,
	2018		2017
	(In thousands)
United States	$	188,203	$	165,337
Satellites in orbit	2,504,734		926,090
Iridium NEXT systems under construction (United States)	658,395		2,088,380
All others (1)	19,523		30,355
Total	$	3,370,855	$	3,210,162

⁽¹⁾  No single country in this group represented more than10% of property and equipment, net.

Revenue by geographic area was as follows:

	Year Ended December 31,
	2018		2017		2016
			(In thousands)
United States	$	276,398	$	229,741	$	226,190
Canada	48,511		44,107		42,373
United Kingdom	51,344		46,245		47,135
Other countries (1)	146,755		127,953		117,942
Total	$	523,008	$	448,046	$	433,640

⁽¹⁾  No single country in this group represented more than10% of revenue.

Revenue is attributed to geographic area based on the billing address of the distributor. Service location and the billing address are often not the same. The Company’s distributors sell services directly or indirectly to end users, who may be located or use the Company’s products and services elsewhere. The Company cannot provide the geographical distribution of end users because it does not contract directly with them. The Company is exposed to foreign currency exchange fluctuations as foreign currency exchange rate movements create a degree of risk by affecting the U.S. dollar value of sales made and costs incurred in foreign currencies.

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16. Employee Benefit Plan

The Company sponsors a defined-contribution 401(k) retirement plan (the “Plan”) that covers all employees. Employees are eligible to participate in the Plan on the first day of the month following the date of hire, and participants are100% vested from the date of eligibility. The Company matches employees’ contributions equal to100% of the salary deferral contributions up to5% of the employees’ eligible compensation each pay period. Company-matching contributions to the Plan were$3.0 million,$2.5 million and$1.3 million for the years ended December 31, 2018, 2017 and 2016, respectively.

17. Selected Quarterly Information (Unaudited)

The following represents the Company’s unaudited quarterly results:

	Quarter Ended
	March 31, 2018		June 30, 2018			September 30, 2018			December 31, 2018
	(In thousands, except per share data)
Revenue	$	119,148	$	134,931		$	136,764		$	132,165
Operating income (loss)	$	19,439	$	16,345		$	6,011		$	(142	)
Net income (loss)	$	11,472	$	(4,418	)	$	(12,856	)	$	(7,582	)
Net income (loss) per common share - basic	$	0.08	$	(0.06	)	$	(0.13	)	$	(0.09	)
Net income (loss) per common share - diluted	$	0.07	$	(0.06	)	$	(0.13	)	$	(0.09	)

	Quarter Ended
	March 31, 2017		June 30, 2017		September 30, 2017		December 31, 2017
	(In thousands, except per share data)
Revenue	$	104,426	$	111,604	$	116,547	$	115,469
Operating income (loss) (1)	$	55,602	$	35,742	$	38,082	$	(13,950	)
Net income (2)	$	37,948	$	24,778	$	29,253	$	141,877
Net income per common share - basic	$	0.35	$	0.21	$	0.26	$	1.40
Net income per common share - diluted	$	0.30	$	0.20	$	0.23	$	1.10

⁽¹⁾  Includes accelerated depreciation of$36.8 million in the fourth quarter of 2017 associated with the write-off of the full amount previously paid to Kosmotras which decreased operating income. Also includes the impact of$14.2 million related to the gain on the transaction with Boeing, effective January 3, 2017.

⁽²⁾ Includes the provisional estimated impact of the Tax Act enacted in December 2017 on the Company's deferred tax assets and liabilities. Immaterial adjustments to these provisional amounts were made in 2018.

The sum of the per share amounts does not equal the annual amounts due to changes in the weighted-average number of common shares outstanding during the year.

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Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

Under the supervision and with the participation of our management, including our chief executive officer, who is our principal executive officer, and our chief financial officer, who is our principal financial officer, we conducted an evaluation of our disclosure controls and procedures, as such term is defined in Rule 13a-15(e) under the Securities Exchange Act of 1934, as amended, or the Exchange Act, as of the end of the period covered by this report. In evaluating the disclosure controls and procedures, management recognized that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives. In addition, the design of disclosure controls and procedures must reflect the fact that there are resource constraints and that management is required to apply its judgment in evaluating the benefits of possible controls and procedures relative to their costs. In addition, the design of any system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions; over time, controls may become inadequate because of changes in conditions, or the degree of compliance with policies or procedures may deteriorate. Because of the inherent limitations in a control system, misstatements due to error or fraud may occur and not be detected.

Based on this evaluation, our chief executive officer and our chief financial officer concluded that our disclosure controls and procedures were effective to provide reasonable assurance that information required to be disclosed by us in reports we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the U.S. Securities and Exchange Commission’s rules and forms, and is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosures.

Management’s Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Internal control over financial reporting is defined in Rules 13a-15(f) and 15d-15(f) promulgated under the Exchange Act as a process designed by, or under the supervision of, our principal executive and principal financial officers and effected by our board of directors, management and other personnel, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with U.S. generally accepted accounting principles. Such internal control includes those policies and procedures that:

• Pertain to the maintenance of records that in reasonable detail accurately and fairly reflect the transactions and dispositions of the assets of our company;

• Provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of our company; and

• Provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of our company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Our management assessed the effectiveness of our internal control over financial reporting as of December 31, 2018. In making this assessment, our management used the criteria set forth in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 Framework). Based on its assessment, our management has determined that, as of December 31, 2018, our internal control over financial reporting was effective based on those criteria

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Our independent registered public accounting firm, Ernst & Young LLP, has audited our 2018 financial statements. Ernst & Young LLP was given unrestricted access to all financial records and related data, including minutes of all meetings of stockholders, the Board of Directors and committees of the Board. Ernst & Young LLP has issued an unqualified report on our 2018 financial statements as a result of the audit and also has issued an unqualified report on our internal controls over financial reporting which is attached hereto.

Changes in Internal Control Over Financial Reporting

During the quarter ended December 31, 2018, there were no changes in our internal control over financial reporting, as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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Report of Ernst & Young LLP, Independent Registered Public Accounting Firm

To the Stockholders and the Board of Directors of Iridium Communications Inc.

Opinion on Internal Control over Financial Reporting

We have audited Iridium Communications Inc.’s internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). In our opinion, Iridium Communications Inc. (the Company) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2018, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of Iridium Communications Inc. as of December 31, 2018 and 2017, the related consolidated statements of operations and comprehensive income (loss), changes in stockholders’ equity, and cash flows for each of the three years in the period ended December 31, 2018, and the related notes and our report dated February 28, 2019 expressed an unqualified report thereon.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.

Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definitions and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ Ernst & Young LLP

Tysons, Virginia

February 28, 2019

100

Item 9B. Other Information

None.

101

PART III

We will file a definitive Proxy Statement for our 2019 Annual Meeting of Stockholders (the “2019 Proxy Statement”) with the SEC, pursuant to Regulation 14A, not later than 120 days after the end of our fiscal year. Accordingly, certain information required by Part III has been omitted as permitted by General Instruction G (3) to Form 10-K. Only those sections of the 2019 Proxy Statement that specifically address the items set forth herein are incorporated by reference.

Item 10. Directors, Executive Officers and Corporate Governance

The information required by this Item is incorporated by reference to the sections of our 2019 Proxy Statement entitled “Board of Directors and Committees,” “Election of Directors,” “Management” and “Section 16(a) Beneficial Ownership Reporting Compliance.”

Item 11. Executive Compensation

The information required by this Item is incorporated by reference to the sections of our 2019 Proxy Statement entitled “Compensation Discussion and Analysis,” “Executive Compensation” and “Director Compensation.”

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

The information required by this Item is incorporated by reference to the sections of our 2019 Proxy Statement entitled “Security Ownership of Certain Beneficial Owners and Management” and “Securities Authorized for Issuance under Equity Compensation Plans.”

Item 13. Certain Relationships and Related Transactions, and Director Independence

The information required by this Item is incorporated by reference to the sections of our 2019 Proxy Statement entitled “Transactions with Related Parties” and “Director Independence.”

Item 14. Principal Accountant Fees and Services

The information required by this Item is incorporated by reference to the section of our 2019 Proxy Statement entitled “Independent Registered Public Accounting Firm Fees.”

102

PART IV

Item 15. Exhibits and Financial Statement Schedules

(a) The following documents are filed as part of this Form 10-K:

(1) Financial Statements

Iridium Communications Inc.:
Report of Ernst & Young LLP, Independent Registered Public Accounting Firm	64
Consolidated Balance Sheets	65
Consolidated Statements of Operations and Comprehensive Income (Loss)	66
Consolidated Statements of Changes in Stockholders’ Equity	67
Consolidated Statements of Cash Flows	68
Notes to Consolidated Financial Statements	69

(2) Financial Statement Schedules

The financial statement schedules are not included here because required information is included in the consolidated financial statements.

(3) Exhibits

The following list of exhibits includes exhibits submitted with this Form 10-K as filed with the Securities and Exchange Commission.

Exhibit No.	Document
3.1	Amended and Restated Certificate of Incorporation dated September 29, 2009, incorporated herein by reference to Exhibit 3.1 of the Registrant’s Current Report on Form 8-K filed with the SEC on September 29, 2009.
3.2	Certificate of Designations of Iridium Communications Inc. filed on October 3, 2012 with the Secretary of State of the State of Delaware designating the preferences, limitations, voting powers and relative rights of the 7% Series A Cumulative Perpetual Convertible Preferred Stock, incorporated herein by reference to Exhibit 3.1 of the Registrant’s Current Report on Form 8-K filed with the SEC on October 3, 2012.
3.3	Certificate of Designations of Iridium Communications Inc. filed on May 14, 2014 with the Secretary of State of the State of Delaware designating the preferences, limitations, voting powers and relative rights of the 6.75% Series B Cumulative Perpetual Convertible Preferred Stock, incorporated by reference to Exhibit 3.1 to the Registrant’s Registration Statement on Form 8-A filed with the SEC on May 14, 2014.
3.4	Certificate of Amendment to Amended and Restated Certificate of Incorporation dated May 12, 2015, incorporated by reference to Exhibit 3.1 of the Registrant’s Current Report on Form 8-K filed with the SEC on May 15, 2015.
3.5	Amended and Restated Bylaws, incorporated herein by reference to Exhibit 3.2 of the Registrant’s Current Report on Form 8-K filed with the SEC on May 15, 2015.
4.1	Specimen Common Stock Certificate, incorporated herein by reference to Exhibit 4.2 of the Registrant’s Registration Statement on Form S-1 (Registration No. 333-147722) filed with the SEC on February 4, 2008.
4.2	Indenture between the Company and U.S. Bank National Association, as trustee, dated as of March 21, 2018, incorporated herein by reference to Exhibit 4.1 to the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on April 26, 2018.
10.1†	Supplemental Agreement dated as of March 9, 2018 between Iridium Satellite LLC and Société Générale, as BPIAE Agent, amending and restating the Third Amended and Restated BPIAE (formerly COFACE) Facility Agreement among Iridium Satellite LLC, the Registrant, Iridium Holdings LLC, SE Licensing LLC, Iridium Carrier Holdings LLC, Iridium Carrier Services LLC, Syncom-Iridium Holdings Corp., Iridium Constellation LLC and Iridium Government Services LLC; Deutsche Bank AG (Paris Branch), Banco Santander SA, Société Générale, Natixis, Mediobanca International (Luxembourg) S.A., BNP Paribas, Crédit Industriel et Commercial, Intesa Sanpaolo S.p.A. (Paris Branch) and Unicredit Bank Austria AG; Deutsche Bank Trust Company Americas as the security agent and U.S. collateral agent; and Société Générale as the BPIAE agent, dated as of October 4, 2010, as amended and restated on August 1, 2012, May 2, 2014 and July 26, 2017, incorporated herein by reference to Exhibit 10.1 to the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on April 26, 2018.

103

Exhibit No.	Document
10.2††	Letter Agreement, dated as of October 11, 2018, by and between Iridium Satellite LLC and Societe Generale, as BPIAE Agent, amending the terms of the BPIAE Facility Agreement, dated as of October 4, 2010, as amended and restated by the Supplemental Agreement dated as of March 9, 2018.
10.3	Supplemental Agreement dated as of December 21, 2018 between Iridium Satellite LLC and Société Générale, as BPIAE Agent, amending the BPIAE Facility Agreement, dated as of October 4, 2010, as amended and restated by the Supplemental Agreement dated as of March 9, 2018.
10.4	Security Agreement, dated as of October 13, 2010, between the Registrant, Iridium Satellite LLC, Iridium Holdings LLC, Iridium Carrier Holdings LLC, Iridium Carrier Services LLC, SE Licensing LLC, Iridium Government Services LLC, Iridium Constellation LLC, Syncom-Iridium Holdings Corp. and Deutsche Bank Trust Company Americas, acting as Security Agent, incorporated by reference to Exhibit 10.2 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 7, 2011.
10.5	Pledge Agreement, dated as of October 13, 2010, between the Registrant, Syncom-Iridium Holdings Corp., Iridium Holdings LLC, Iridium Carrier Holdings LLC, Iridium Satellite LLC, Iridium Constellation LLC and Deutsche Bank Trust Company Americas, acting as Security Agent, incorporated by reference to Exhibit 10.3 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 7, 2011.
10.6	Stock Pledge Agreement, dated as of October13, 2010, between the Registrant and Deutsche Bank Trust Company Americas, acting as Security Agent, incorporated by reference to Exhibit 10.4 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 7, 2011.
10.7	Purchase Agreement between the Company and Deutsche Bank Securities Inc., dated as of March 16, 2018, incorporated herein by reference to Exhibit 10.3 to the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on April 26, 2018.
10.8†	Settlement Agreement between Iridium Holdings LLC, Iridium Satellite LLC, the Registrant and Motorola, Inc., dated as of September 30, 2010, incorporated by reference to Exhibit 10.5 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 7, 2011.
10.9†	Security Agreement, dated as of September 30, 2010, between Iridium Satellite LLC and Deutsche Bank Trust Company Americas, acting as Collateral Agent, incorporated by reference to Exhibit C to Exhibit 10.5 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 7, 2011.
10.10	Guaranty, dated as of September 30, 2010, by Iridium Holdings LLC and the Registrant in favor of Motorola, Inc., incorporated by reference to Exhibit 10.8 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 7, 2011.
10.11	Amended and Restated Transition Services, Products and Asset Agreement, between Iridium Satellite LLC, Iridium Holdings LLC and Motorola, Inc., dated as of September 30, 2010, incorporated by reference to Exhibit 10.9 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 7, 2011.
10.12	Amendment No. 1 to Amended and Restated Transition Services, Products and Asset Agreement, between Iridium Satellite LLC, Iridium Holdings LLC and Motorola, Inc., dated as of December 30, 2010, incorporated by reference to Exhibit 10.10 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 7, 2011.
10.13†	System Intellectual Property Rights Amendment and Agreement, between Iridium Satellite LLC and Motorola, Inc., dated as of September 30, 2010, incorporated by reference to Exhibit 10.11 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 7, 2011.
10.14	Supplemental Subscriber Equipment Technology Amendment and Agreement, between Iridium Satellite LLC and Motorola, Inc., dated as of September 30, 2010, incorporated by reference to Exhibit 10.12 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 7, 2011.
10.15†	Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated June 1, 2010, incorporated by reference to Annex 1 to Exhibit 10.1 to the Registrant’s Quarterly Report on Form 10-Q/A filed with the SEC on October 29, 2010.
10.16†	Amendment No. 1 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated August 6, 2010, incorporated by reference to Exhibit 10.3 to the Registrant’s Quarterly Report on Form 10-Q/A filed with the SEC on January 14, 2011.
10.17†	Amendment No. 2 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated September 30, 2010, incorporated by reference to Exhibit 10.4 to the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on November 9, 2010.
10.18†	Amendment No. 3 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated October 25, 2010, incorporated by reference to Exhibit 10.18 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 7, 2011.

104

Exhibit No.	Document
10.19†	Amendment No. 4 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated as of April 29, 2011, incorporated by reference to Exhibit 10.2 to the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on August 8, 2011.
10.20†	Amendment No. 5 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated September 12, 2011, incorporated by reference to Exhibit 10.1 to the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on November 8, 2011.
10.21†	Amendment No. 6 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated October 24, 2011, incorporated by reference to Exhibit 10.22 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 6, 2012.
10.22†	Amendment No. 7 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated March 12, 2012, incorporated by reference to Exhibit 10.1 to the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on May 3, 2012.
10.23†	Amendment No. 8 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated March 13, 2012, incorporated by reference to Exhibit 10.2 to the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on May 3, 2012.
10.24†	Amendment No. 9 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated June 19, 2012, incorporated by reference to Exhibit 10.1 to the Registrant’s Annual Report on Form 10-Q filed with the SEC on August 2, 2012.
10.25†	Amendment No. 10 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated June 19, 2012, incorporated by reference to Exhibit 10.2 to the Registrant’s Annual Report on Form 10-Q filed with the SEC on August 2, 2012.
10.26†	Amendment No. 11 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated July 3, 2012, incorporated by reference to Exhibit 10.1 to the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on November 2, 2012.
10.27†	Amendment No. 12 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated July 6, 2012, incorporated by reference to Exhibit 10.2 to the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on November 2, 2012.
10.28†	Amendment No. 13 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated October 25, 2012, incorporated by reference to Exhibit 10.26 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 5, 2013.
10.29†	Amendment No. 14 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated November 8, 2012, incorporated by reference to Exhibit 10.27 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 5, 2013.
10.30†	Amendment No. 15 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated June 11, 2013, incorporated herein by reference to Exhibit 10.2 of the Registrant’s Quarterly Report Form 10-Q filed with the SEC on October 31, 2013.
10.31†	Amendment No. 16 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated July 24, 2013, incorporated herein by reference to Exhibit 10.3 of the Registrant’s Quarterly Report Form 10-Q filed with the SEC on October 31, 2013.
10.32†	Amendment No. 17 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated August 20, 2013, incorporated herein by reference to Exhibit 10.4 of the Registrant’s Quarterly Report Form 10-Q filed with the SEC on October 31, 2013.
10.33†	Amendment No. 18 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated October 21, 2013, incorporated by reference to Exhibit 10.38 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 4, 2014.

105

Exhibit No.	Document
10.34†	Amendment No. 19 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated October 29, 2013, incorporated by reference to Exhibit 10.39 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 4, 2014.
10.35†	Amendment No. 20 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated July 7, 2014, incorporated herein by reference to Exhibit 10.1 of the Registrant’s Quarterly Report Form 10-Q filed with the SEC on October 30, 2014.
10.36†	Amendment No. 21 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated July 9, 2014, incorporated herein by reference to Exhibit 10.2 of the Registrant’s Quarterly Report Form 10-Q filed with the SEC on October 30, 2014.
10.37†	Amendment No. 22 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated July 14, 2014, incorporated herein by reference to Exhibit 10.3 of the Registrant’s Quarterly Report Form 10-Q filed with the SEC on October 30, 2014.
10.38†	Amendment No. 23 to the Full Scale System Development Contract No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated January 30, 2015, incorporated herein by reference to Exhibit 10.2 of the Registrant’s Quarterly Report Form 10-Q filed with the SEC on April 30, 2015.
10.39†	Amendment No. 24 to the Full Scale System Development Contact No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated September 22, 2015, incorporated by reference to Exhibit 10.2 to the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on October 29, 2015.
10.40†	Amendment No. 26 to the Full Scale System Development Contact No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated September 19, 2016, incorporated herein by reference to Exhibit 10.3 to the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on October 27, 2016.
10.41†	Amendment No. 27 to the Full Scale System Development Contact No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated March 2, 2017, incorporated herein by reference to Exhibit 10.3 to the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on April 27, 2017.
10.42†	Amendment No. 28 to the Full Scale System Development Contact No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated May 18, 2017, incorporated herein by reference to Exhibit 10.2 to the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on October 26, 2017.
10.43†	Amendment No. 29 to the Full Scale System Development Contact No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated July 26, 2017, incorporated herein by reference to Exhibit 10.3 to the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on October 26, 2017.
10.44†	Amendment No. 30 to the Full Scale System Development Contact No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated October 26, 2017, incorporated herein by reference to Exhibit 10.48 to the Registrant’s Annual Report on Form 10-K filed with the SEC on February 22, 2018.
10.45†	Amendment No. 31 to the Full Scale System Development Contact No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated October 30, 2017, incorporated herein by reference to Exhibit 10.49 to the Registrant’s Annual Report on Form 10-K filed with the SEC on February 22, 2018.
10.46†	Amendment No. 32 to the Full Scale System Development Contact No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated March 9, 2018, incorporated herein by reference to Exhibit 10.2 to the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on April 26, 2018.
10.47††	Amendment No. 33 to the Full Scale System Development Contact No. IS-10-021 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, dated October 10, 2018.
10.48†	Contract for Launch Services No. IS-10-008 between Iridium Satellite LLC and Space Exploration Technologies Corp., dated March 19, 2010, incorporated by reference to Exhibit 10.5 to the Registrant’s Quarterly Report on Form 10-Q/A filed with the SEC on March 29, 2011.
10.49†	Amendment No. 1 to the Contract for Launch Services No. IS-10-008 between Iridium Satellite LLC and Space Exploration Technologies Corp., dated September 17, 2010, incorporated by reference to Exhibit 10.6 to the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on November 9, 2010.

106

Exhibit No.	Document
10.50†	Amendment No. 2 to the Contract for Launch Services No. IS-10-008 between Iridium Satellite LLC and Space Exploration Technologies Corp., effective as of August 1, 2012, incorporated by reference to Exhibit 10.6 to the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on November 2, 2012.
10.51†	Amendment No. 3 to the Contract for Launch Services No. IS-10-008 between Iridium Satellite LLC and Space Exploration Technologies Corp., dated as of May 9, 2013, incorporated herein by reference to Exhibit 10.5 of the Registrant’s Quarterly Report Form 10-Q filed with the SEC on October 31, 2013.
10.52	Amendment No. 4 to the Contract for Launch Services No. IS-10-008 between Iridium Satellite LLC and Space Exploration Technologies Corp., dated as of January 27, 2014, incorporated herein by reference to Exhibit 10.2 of the Registrant’s Quarterly Report Form 10-Q filed with the SEC on May 1, 2014.
10.53†	Amendment No. 5 to the Contract for Launch Services No. IS-10-008 between Iridium Satellite LLC and Space Exploration Technologies Corp., dated as of September 15, 2014, incorporated herein by reference to Exhibit 10.4 of the Registrant’s Quarterly Report Form 10-Q filed with the SEC on October 30, 2014.
10.54†	Amendment No. 6 to the Contract for Launch Services No. IS-10-008 between Iridium Satellite LLC and Space Exploration Technologies Corp., dated as of November 2, 2015, incorporated herein by reference to Exhibit 10.53 of the Registrant’s Annual Report Form 10-K filed with the SEC on February 25, 2016.
10.55†	Amendment No. 7 to the Contract for Launch Services No. IS-10-008 between Iridium Satellite LLC and Space Exploration Technologies Corp., dated as of November 2, 2015, incorporated herein by reference to Exhibit 10.57 of the Registrant’s Annual Report on Form 10-K filed with the SEC on February 22, 2018.
10.56†	Amendment No. 8 to the Contract for Launch Services No. IS-10-008 between Iridium Satellite LLC and Space Exploration Technologies Corp., dated as of September 6, 2018, incorporated herein by reference to Exhibit 10.1 of the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on October 25, 2018.
10.57	Intellectual Property Rights Agreement, dated December 11, 2000, among Motorola Inc. and Iridium Satellite LLC, incorporated herein by reference to Exhibit 10.3 of the Registrant’s Current Report on Form 8-K filed with the SEC on September 29, 2009.
10.58	Subscriber Equipment Technology Agreement (Design), dated as of September 30, 2002, by and among Motorola Inc. and SE Licensing LLC, incorporated herein by reference to Exhibit 10.4 of the Registrant’s Current Report on Form 8-K filed with the SEC on September 29, 2009.
10.59	Subscriber Equipment Technology Agreement (Manufacturing), dated as of September 30, 2002, by and among Motorola Inc. and SE Licensing LLC, incorporated herein by reference to Exhibit 10.5 of the Registrant’s Current Report on Form 8-K filed with the SEC on September 29, 2009.
10.60†	Contract for Enhanced Mobile Satellite Services between Iridium Satellite LLC and the Defense Information Systems Agency, effective October 22, 2013, incorporated by reference to Exhibit 10.59 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 4, 2014.
10.61†	Amendment to Contract for Enhanced Mobile Satellite Services between Iridium Satellite LLC and the Defense Information Systems Agency, dated as of June 3, 2015, incorporated herein by reference to Exhibit 10.3 of the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on July 30, 2015.
10.62	Form of Registration Rights Agreement, incorporated by reference to Annex D of the Registrant’s Proxy Statement filed with the SEC on August 28, 2009.
10.63†	Amendment No. 1 to Registration Rights Agreement, dated as of March 29, 2011, by and among Iridium Communications Inc. and the parties listed on the signature pages thereto, incorporated by reference to Exhibit 10.1 of the Registrant’s Current Report on Form 8-K, filed with the SEC on March 30, 2011.
10.64*	Amended and Restated Employment Agreement, dated as of March 30, 2011, by and between the Registrant and Matthew J. Desch, incorporated herein by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K, filed with the SEC on April 5, 2011.
10.65*	Employment Agreement, dated as of March 31, 2010, by and between the Registrant and Thomas J. Fitzpatrick, incorporated herein by reference to Exhibit 10.1 of the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on May 10, 2010.
10.66*	Amendment to Employment Agreement by and between the Registrant and Thomas J. Fitzpatrick, dated as of December 31, 2010, incorporated by reference to Exhibit 10.34 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 7, 2011.
10.67*	Employment Agreement between the Registrant and S. Scott Smith, dated as of March 2010, incorporated by reference to Exhibit 10.39 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 6, 2012.
10.68*	Amendment to Employment Agreement between the Registrant and S. Scott Smith, dated as of December 31, 2010, incorporated by reference to Exhibit 10.40 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 6, 2012.

107

Exhibit No.	Document
10.69*	Employment Agreement between the Registrant and Bryan J. Hartin, dated as of December 10, 2012, incorporated by reference to Exhibit 10.69 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 4, 2014.
10.70*	Employment Agreement between the Registrant and Thomas D. Hickey, dated as of April 29, 2011, incorporated by reference to Exhibit 10.70 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 4, 2014.
10.71*	2009 Iridium Communications Inc. Stock Incentive Plan, incorporated by reference to Annex E of the Registrant’s Proxy Statement filed with the SEC on August 28, 2009.
10.72	Form of Indemnity Agreement between the Registrant and each of its directors and officers, incorporated by reference to Exhibit 10.5 to the Registrant’s Form S-1/A filed with the SEC on February 4, 2008.
10.73*	Form of Stock Option Award Agreement for use in connection with the 2009 Iridium Communications Inc. Stock Incentive Plan, incorporated by reference to Exhibit 10.42 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 7, 2011.
10.74*	Form of Restricted Stock Unit Agreement for use in connection with the 2009 Iridium Communications Inc. Stock Incentive Plan, incorporated by reference to Exhibit 10.48 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 6, 2012.
10.75*	Performance Share Program established under the Iridium Communications Inc. 2015 Equity Incentive Plan, incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed with the SEC on March 3, 2016.
10.76*	Form of Performance Share Award Grant Notice and Performance Share Award Agreement for use in connection with the Performance Share Program established under the Iridium Communications Inc. 2015 Equity Incentive Plan, incorporated by reference to Exhibit 10.2 to the Registrant’s Current Report on Form 8-K filed with the SEC on March 3, 2016.
10.77*	Form of Stock Option Agreement for Non-Employee Directors for use in connection with the 2009 Iridium Communications Inc. Stock Incentive Plan, incorporated by reference to Exhibit 10.46 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 7, 2011.
10.78*	Form of Restricted Stock Award Agreement for Non-Employee Directors for use in connection with the 2009 Iridium Communications Inc. Stock Incentive Plan, incorporated by reference to Exhibit 10.47 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 7, 2011.
10.79*	Form of Restricted Stock Unit Agreement for Non-Employee Directors for use in connection with the 2009 Iridium Communications Inc. Stock Incentive Plan, incorporated by reference to Exhibit 10.48 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 7, 2011.
10.80*	Iridium Communications Inc. 2012 Equity Incentive Plan, incorporated by reference to Appendix A to the Registrant’s Proxy Statement filed with the SEC on April 10, 2012.
10.81*	Forms of Stock Option Grant Notice and Stock Option Agreement for use in connection with the Iridium Communications Inc. 2012 Equity Incentive Plan, incorporated by reference to Exhibit 99.2 to the Registrant’s Current Report on Form 8-K filed with the SEC on May 23, 2012.
10.82*	Forms of Restricted Stock Unit Grant Notice and Restricted Stock Unit Agreement for use in connection with the Iridium Communications Inc. 2012 Equity Incentive Plan, incorporated by reference to Exhibit 99.3 to the Registrant’s Current Report on Form 8-K filed with the SEC on May 23, 2012.
10.83*	Non-Employee Director Compensation Plan dated December 11, 2018.
10.84*	Iridium Communications Inc. 2018 Executive Performance Bonus Plan, incorporated herein by reference to Exhibit 10.4 of the Registrant’s Quarterly Report on Form 10-Q filed with the SEC on April 26, 2018.
10.85*	Iridium Communications Inc. Amended and Restated 2015 Equity Incentive Plan, incorporated herein by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K, filed with the SEC on May 16, 2017.
10.86*	Forms of Option Grant Notice and Option Agreement for use in connection with the Iridium Communications Inc. Amended and Restated 2015 Equity Incentive Plan, incorporated by reference to Exhibit 10.2 of the Registrant’s Current Report on Form 8-K filed with the SEC on May 15, 2015.
10.87*	Forms of Restricted Stock Unit Award Grant Notice and Restricted Stock Unit Award Agreement for use in connection with the Iridium Communications Inc. Amended and Restated 2015 Equity Incentive Plan, incorporated by reference to Exhibit 10.3 of the Registrant’s Current Report on Form 8-K filed with the SEC on May 15, 2015.
10.88*	Forms of Non-Employee Director Option Grant Notice and Non-Employee Director Option Agreement for use in connection with the Iridium Communications Inc. Amended and Restated 2015 Equity Incentive Plan, incorporated by reference to Exhibit 10.4 of the Registrant’s Current Report on Form 8-K filed with the SEC on May 15, 2015.

108

Exhibit No.	Document
10.89*	Forms of Non-Employee Director Restricted Stock Unit Award Grant Notice and Non-Employee Director Restricted Stock Unit Award Agreement for use in connection with the Iridium Communications Inc. 2015 Equity Incentive Plan, incorporated by reference to Exhibit 10.5 of the Registrant’s Current Report on Form 8-K filed with the SEC on May 15, 2015.
10.90*	UK Sub-Plan of the Iridium Communications Inc. 2015 Equity Incentive Plan, incorporated by reference to Exhibit 10.6 of the Registrant’s Current Report on Form 8-K filed with the SEC on May 15, 2015.
10.91*	Forms of UK Option Grant Notice and UK Option Agreement for use in connection with the Iridium Communications Inc. Amended and Restated 2015 Equity Incentive Plan, incorporated by reference to Exhibit 10.7 of the Registrant’s Current Report on Form 8-K filed with the SEC on May 15, 2015.
10.92*	Forms of UK Restricted Stock Unit Award Grant Notice and UK Restricted Stock Unit Award Agreement for use in connection with the Iridium Communications Inc. 2015 Equity Incentive Plan, incorporated by reference to Exhibit 10.8 of the Registrant’s Current Report on Form 8-K filed with the SEC on May 15, 2015.
10.93*	Forms of UK Non-Employee Director Option Grant Notice and UK Non-Employee Director Option Agreement for use in connection with the Iridium Communications Inc. Amended and Restated 2015 Equity Incentive Plan, incorporated by reference to Exhibit 10.9 of the Registrant’s Current Report on Form 8-K filed with the SEC on May 15, 2015.
10.94*	Forms of UK Non-Employee Director Restricted Stock Unit Award Grant Notice and UK Non-Employee Director Restricted Stock Unit Award Agreement for use in connection with the Iridium Communications Inc. Amended and Restated 2015 Equity Incentive Plan, incorporated by reference to Exhibit 10.10 of the Registrant’s Current Report on Form 8-K filed with the SEC on May 15, 2015.
21.1	List of Subsidiaries.
23.1	Consent of Ernst & Young LLP, independent registered public accounting firm.
31.1	Certification of Chief Executive Officer pursuant to Section 302 of The Sarbanes-Oxley Act of 2002.
31.2	Certification of Chief Financial Officer pursuant to Section 302 of The Sarbanes-Oxley Act of 2002.
32.1	Certification of Chief Executive Officer and Chief Financial Officer pursuant to Section 906 of The Sarbanes-Oxley Act of 2002.
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema
101.CAL	XBRL Taxonomy Extension Calculation Linkbase
101.DEF	XBRL Taxonomy Extension Definition Linkbase
101.LAB	XBRL Taxonomy Extension Label Linkbase
101.PRE	XBRL Taxonomy Extension Presentation Linkbase

† Confidential treatment has been granted for certain portions omitted from this exhibit pursuant to Rule 24b-2 under the Securities Exchange Act of 1934, as amended. Confidential portions of this exhibit have been separately filed with the Securities and Exchange Commission.

†† Confidential treatment has been requested for certain portions omitted from this exhibit pursuant to Rule 24b-2 under the Securities Exchange Act of 1934, as amended. Confidential portions of this exhibit have been separately filed with the Securities and Exchange Commission.

* Denotes compensatory plan, contract or arrangement.

109

Item 16. Form 10-K Summary

Not applicable.

110

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	IRIDIUM COMMUNICATIONS INC.
Date: February 28, 2019	By:	/s/  Thomas J. Fitzpatrick
		Thomas J. Fitzpatrick
		Chief Financial Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated: 

Name	Title	Date
/s/ Matthew J. Desch	Chief Executive Officer and Director	February 28, 2019
Matthew J. Desch	(Principal Executive Officer)
/s/ Thomas J. Fitzpatrick	Chief Financial Officer, Chief Administrative Officer and Director	February 28, 2019
Thomas J. Fitzpatrick	(Principal Financial Officer)
/s/ Timothy P. Kapalka	Vice President and Corporate Controller, Iridium Satellite LLC	February 28, 2019
Timothy P. Kapalka	(Principal Accounting Officer)
/s/ Robert H. Niehaus	Director and Chairman of the Board	February 28, 2019
Robert H. Niehaus
/s/ Thomas C. Canfield	Director	February 28, 2019
Thomas C. Canfield
/s/ Jane L. Harman	Director	February 28, 2019
Jane L. Harman
/s/ Alvin B. Krongard	Director	February 28, 2019
Alvin B. Krongard
/s/ Eric T. Olson	Director	February 28, 2019
Eric T. Olson
/s/ Steven B. Pfeiffer	Director	February 28, 2019
Steven B. Pfeiffer
/s/ Parker W. Rush	Director	February 28, 2019
Parker W. Rush
/s/ Henrik O. Schliemann	Director	February 28, 2019
Henrik O. Schliemann
/s/ S. Scott Smith	Director	February 28, 2019
S. Scott Smith
/s/ Barry J. West	Director	February 28, 2019
Barry J. West

111

EX-10.2

EXHIBIT 10.2

October 11, 2018

Société Générale

Tour Société Générale

17 cours Valmy

92987 Paris – La Défense Cedex

France

Attention:     Benjamin Graisley, Olivier Gueguen, Sidonie Boisson de Chazournes

Re: Certain Requested Amendments

Dear Messrs. Graisley and Gueguen and Ms. de Chazournes:

Reference is made to that certain BPIAE Facility Agreement, dated as of October 4, 2010, as amended and restated by the Supplemental Agreement dated as of March 9, 2018 (as amended, amended and restated, supplemented or otherwise modified from time to time, the “Facility Agreement”), by and among Iridium Satellite LLC, as the borrower (the “Borrower”), Iridium Communications Inc. (the “Parent”), the other Obligors party thereto, the Lenders party thereto, Société Générale, as the BPIAE Agent (the “BPIAE Agent”) and Deutsche Bank Trust Company Americas, as Security Agent (the “Security Agent”) and U.S. Collateral Agent. Capitalized terms used but not otherwise defined herein shall have the respective meanings ascribed to them in the Facility Agreement. The provisions set forth in clause 1.2 (Construction) of the Facility Agreement shall apply to this letter as though they were set out in full in this letter except that references to the “Agreement” are construed as references to this letter.

[***]

Requested Amendments

The Borrower requests the consent of the Majority Lenders to the following amendments to the Facility Agreement (the “Requested Amendments”):

a) The definition of “Calculation Period” shall be amended by being deleted and replaced in its entirety by the following:

“Calculation Period means (a) for the purpose of calculating the DSCR, each period of 6 months, ending or commencing (as applicable) on each Calculation

Date, and (b) for any other Financial Covenant, each period of 12 months ending or commencing (as applicable) on each Calculation Date.”

b) The definition of “NEXT System Completion Longstop Date” shall be amended by being deleted and replaced in its entirety by the following:

“NEXT System Completion Longstop Date means [***].”

Consent and Amendment

By a letter dated September 12, 2018, the Borrower kindly requested (i) that the Majority Lenders consent to the Requested Amendments by October 11, 2018, and (ii) that the BPIAE Agent coordinate such actions required on the part of the Majority Lenders for the Requested Amendments as it deems necessary or desirable.

Understanding that Majority Lenders’ consent to the Requested Amendment was obtained as of October 11, 2018, the Borrower hereby requests that the BPIAE Agent countersign this letter in the space provided below (the date of such countersignature the “Effective Date”). The Facility Agreement shall be amended as of the Effective Date in the form of the Requested Amendments.

Miscellaneous.

i. Save as expressly stipulated in this letter, all the Finance Documents shall remain unchanged and in full force and effect, and, from the Effective Date, the Facility Agreement and this letter will be read and construed as one document.

ii. The Requested Amendments set forth in this letter are effective solely for the purposes as set forth herein and shall be limited precisely as written and shall not be in any event deemed, except as expressly provided herein, to be a waiver or modification of any other term or condition of the Facility Agreement or any other Finance Document. Nothing in this letter shall affect the rights of any Finance Party in respect of the occurrence of any other Default or Event of Default which is continuing and which has not been remedied or waived in accordance with the terms of the Finance Documents or which arises on or after the date of this letter.

iii. This letter is designated a Finance Document.

iv. A person who is not a party to this letter (other than any Finance Party) has no right under the Third Parties Act to enforce or enjoy the benefit of any term of this letter.

v. This letter and any non-contractual obligations arising out of or in connection with it are governed by English law.

vi. The provisions of Article 39 and Article 40 of the Facility Agreement are hereby incorporated by reference, mutatis mutandis, as if set forth in full herein.

We hope that this letter is helpful to the BPIAE Agent and the Majority Lenders in understanding the Borrower’s request. Should you have any questions or if you would like any additional information regarding any of the foregoing, please do not hesitate to contact Patrick McClain at [***].

[Signature page follows]

Yours truly,

IRIDIUM SATELLITE LLC,

as Borrower

By: /s/ Thomas J. Fitzpatrick

Name: Thomas J. Fitzpatrick

Title: Chief Financial Officer

Agreed and acknowledged on 11 October 2018 (the “Effective Date”)

with the consent of the Majority Lenders:

SOCIÉTÉ GÉNÉRALE,

as BPIAE Agent

By: /s/ Florian Degunst

Name: Florian Degunst

Title: Structured Finance Middle Office Operations, Senior Officer

By: /s/ Benjamin Graisely

Name: Benjamin Graisely

Title: Structured Finance Middle Operations

*** Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended.

EX-10.3

Execution version

EXHIBIT 10.3

SUPPLEMENTAL AGREEMENT

dated 

___21__ DECEMBER 2018

between

IRIDIUM COMMUNICATIONS INC.

as Parent

and

IRIDIUM SATELLITE LLC

as Borrower

and

THE GUARANTORS

and

SOCIÉTÉ GÉNÉRALE

the BPIAE Agent

and

DEUTSCHE BANK TRUST COMPANY AMERICAS

as Security Agent

relating to a BPIAE Facility Agreement

dated 4 October 2010

as amended from time to time

and as further amended on the Effective Date (as defined herein)

0080105-0000405 PA:21116361.7

Execution version

EXHIBIT 10.3

CONTENTS

Clause    Page

1.	Interpretation	3
2.	Amendments	4
3.	Release of Share Pledge	4
4.	Long Stop Date	5
5.	Representations	5
6.	Costs and Expenses	6
7.	Consents	6
8.	Security	7
9.	Miscellaneous	7
10.	Governing Law	8
11.	Enforcement	8

Schedule

1.	Conditions Precedent	10
2.	Amendments to the Facility Agreement	13
3.	Form of Direct Agreement	20
4.	Form of Amended and Restated Hosting Cost Reimbursement Agreement	21
Signatories		22

0080105-0000405 PA:21116361.7

THIS AGREEMENT is dated __21__ December 2018

BETWEEN:

(1) IRIDIUM COMMUNICATIONS INC., a Delaware corporation (the Parent);

(2) IRIDIUM SATELLITE LLC, a Delaware limited liability company, as borrower (the Borrower);

(3) THE GUARANTORS under and as defined in the Facility Agreement (defined below);

(4) SOCIÉTÉ GÉNÉRALE as agent of the other Finance Parties (in this capacity the BPIAE Agent); and

(5) DEUTSCHE BANK TRUST COMPANY AMERICAS as security agent and trustee for the Secured Parties (in this capacity the Security Agent).

BACKGROUND

(A) We refer to the Facility Agreement.

(B) By way of a waiver request dated 2 November 2018 (the Waiver Request) the Borrower informed the BPIAE Agent that Aireon is in the process of negotiating a financing (the Aireon Financing). In order to facilitate such Aireon Financing, the Borrower requested certain amendments to be made to the arrangements contemplated by the Facility Agreement.

(C) As indicated in the Waiver Request, the Aireon Financing contemplates that the share capital structure of Aireon be modified. Consequently the Borrower has requested the BPIAE Agent to consent to the release of security over the share pledge dated 01 August 2012 entered into between the Borrower and the Security Agent (the ExistingShare Pledge Agreement) and, solely to the extent relating to a grant of security over the limited liability company interest of Aireon LLC, the security agreement dated 13 October 2010, entered into between the Security Agent, the Parent, the Borrower and the other Obligors party thereto (the Existing NY Security Agreement).

(D) BPIAE and the Lenders have consented to the amendments to the Facility Agreement in the manner set out in Schedule 2 (Amendments to the Facility Agreement) of this Agreement and the release of the Existing Share Pledge Agreement subject to the terms of this Agreement.

(E) Accordingly, the BPIAE Agent is authorised to execute this Agreement on behalf of the Finance Parties.

IT IS AGREED as follows:

1. INTERPRETATION

1.1 Definitions

(a) In this Agreement:

0080105-0000405 PA:21116361.7 3

Aireon HoldCo has the meaning given to it in Schedule 2 (Amendments to the Facility Agreement).

Aireon HoldCo Share Pledge Agreement means a share pledge agreement with respect to the shares in Aireon HoldCo (as defined in the amended Facility Agreement) to be entered into by the Borrower as pledgor and the Security Agent.

Effective Date has the meaning given to it in Clause 2 (Amendments).

Facility Agreement means the Facility Agreement between among others the Parent, the Borrower, the Guarantors and the BPIAE Agent dated 4 October 2010 and as amended from time to time.

(b) Capitalised terms defined in the Facility Agreement have, unless expressly defined in this Agreement, the same meaning in this Agreement.

1.2 Construction

The principles of construction set out in clause 1.2 of the Facility Agreement will have effect as if set out in this Agreement.

2. AMENDMENTS

(a) The Facility Agreement shall be amended in the manner set out in Schedule 2 (Amendments to the Facility Agreement) from the date on which the BPIAE Agent has notified the Borrower and the Lenders that it has received all of the documents and evidence set out in Schedule 1 (Conditions Precedent) in form and substance satisfactory to it (acting on the instructions of all Lenders) (the Effective Date).

(b) The BPIAE Agent shall, promptly upon receipt of all the documents referred to in 2(a) above, notify the Borrower and the Lenders.

(c) On and after the date hereof, each reference in the Facility Agreement to “this Agreement”, “hereunder”, “hereof”, “herein” or words of like import referring to the Facility Agreement, and each reference in other Finance Documents to the “Facility Agreement”, “thereunder”, “thereof” or words of like import referring to the Facility Agreement shall mean and be a reference to the Facility Agreement as amended by this Agreement.

3. RELEASE OF SHARE PLEDGE

(a) With effect from the Effective Date the Security Agent (acting on the instructions of the BPIAE Agent) will unconditionally and irrevocably:

(i) release the pledge created under the Existing Share Pledge Agreement;

(ii) terminate the Existing Share Pledge Agreement; and

(iii) discharge the Borrower from all its obligations under the Existing Share Pledge Agreement.

0080105-0000405 PA:21116361.7 4

(b) On the Effective Date, the Security Agent (acting on the instructions of the BPIAE Agent, on behalf of the Lenders) will sign a release letter in respect of the Existing Share Pledge Agreement and, solely to the extent relating to a grant of security over the limited liability company interest of Aireon LLC, the Existing NY Security Agreement, in form and substance reasonably satisfactory to the Borrower (including an authorization for the Borrower to file a UCC-3 termination financing statement as it relates to the Existing Share Pledge Agreement), and will take such other actions reasonably requested by the Borrower as may be necessary to effect such release.

4. LONG STOP DATE

If the Effective Date has not occurred by 30 June 2019, the Facility Agreement will not be amended in the manner contemplated by this Agreement and the Existing Share Pledge Agreement will not be released as contemplated under Clause 3 above.

5. REPRESENTATIONS

5.1 Representations

The representations set out in this Clause are made by each Obligor to each Finance Party on:

(a) the date of this Agreement; and

(b) the Effective Date.

5.2 Powers and authority

It has the power to enter into, perform and deliver, and has taken all necessary action to authorise the entry into, performance and delivery of, this Agreement and the transactions contemplated by this Agreement.

5.3 Legal validity

Subject to the Legal Reservations, the obligations expressed to be assumed by it in this Agreement to which it is a party are legal, valid, binding and enforceable obligations.

5.4 Non-conflict

The entry into and performance by it of, and the transactions contemplated by, this Agreement do not and will not conflict with:

(a) any law or regulation applicable to it;

(b) its constitutional documents; or

(c) any agreement or instrument binding upon it or any of its assets or constitute a default or termination event (however described) under any such agreement or instrument where such circumstance has or is reasonably likely to have a Material Adverse Effect.

5.5 Authorisations

0080105-0000405 PA:21116361.7 5

All authorisations required by it in connection with the entry into, performance, validity and enforceability of, and the transactions contemplated by, this Agreement have been obtained or effected (as appropriate) and are in full force and effect.

5.6 Governing law and enforcement

(a) Subject to the Legal Reservations, the choice of governing law of this Agreement will be recognised and enforced in its Relevant Jurisdictions.

(b) Subject to the Legal Reservations, any judgment obtained in relation to this Agreement will be recognised and enforced in its Relevant Jurisdictions.

5.7 Credit Agreement

Unless a representation and warranty set out in clause 20 (Representations) of the Facility Agreement is expressed to be given at a specific date, each Obligor makes the representations and warranties set out in clause 20 (Representations) of the Facility Agreement (other than the representations and warranties in clauses 20.14(a), (b) and (c) (Original Financial Statements), 20.18 (Taxation) and 20.24 (Shares and Material Companies) of the Facility Agreement) on:

(a) the date of this Agreement; and

(b) the Effective Date,

in each case as if references to the Facility Agreement are references to the Facility Agreement, as amended by this Agreement, with reference to the facts and circumstances then existing, provided that, in the case of those representations and warranties contained in clause 20.13 (No misleading information) of the Facility Agreement, such representations and warranties are made with respect to any information delivered under or in connection with this Agreement.

6. COSTS AND EXPENSES

(a) The Borrower must pay to the BPIAE Agent for the account of the BPIAE Agent, all costs and expenses incurred by the BPIAE Agent in relation to this Agreement.

(b) The Borrower must pay to the Security Agent all costs and expenses incurred by it in relation to this Agreement and the Aireon HoldCo Share Pledge Agreement.

7. CONSENTS

Each Obligor:

(a) agrees to the amendment of the Facility Agreement as contemplated by this Agreement; and

(b) with effect from the Effective Date, confirms that any guarantee or security given by it or created under a Finance Document will:

(i) continue in full force and effect; and

0080105-0000405 PA:21116361.7 6

(ii) extend to the liabilities and obligations of the Obligors to the Finance Parties under the Finance Documents as amended by this Agreement.

8. SECURITY

(a) On the Effective Date, each Obligor confirms that:

(i) any Security (as defined in the Transaction Security Documents) in favour of the Secured Parties created by it under the Transaction Security Documents extends to the obligations of the Obligors under the Finance Documents (including as amended by this Agreement) subject to any limitations set out in the Transaction Security Documents;

(ii) the obligations of the Obligors arising under the Facility Agreement (as amended by this Agreement) are included in the Secured Liabilities (as defined in the Transaction Security Documents) subject to any limitations set out in the Transaction Security Documents; and

(iii) the Security (as defined in the Transaction Security Documents) in favour of the Secured Parties created under the Transaction Security Documents continue in full force and effect on the terms of the respective Transaction Security Documents.

(b) No part of this Agreement will create, creates or is intended to create, a registrable Security (as defined in the Transaction Security Documents).

9. MISCELLANEOUS

(a) This Agreement is a Finance Document.

(b) Subject to the terms of this Agreement, the Facility Agreement will remain in full force and effect and, from the Effective Date, the Facility Agreement and this Agreement will be read and construed as one document.

(c) Except to the extent expressly stated in this Agreement, no waiver is given by this Agreement, and the Finance Parties expressly reserve all their rights and remedies in respect of any breach of, or other Default under, a Finance Document.

(d) Each Finance Party reserves any other right or remedy it may have now or subsequently. This Agreement does not constitute a waiver of any right or remedy other than in relation to the specific waivers expressly given under this Agreement.

(e) Nothing in this Agreement shall affect the rights of any Finance Party in respect of the occurrence of any other Default or Event of Default which is continuing and which has not been remedied or waived in accordance with the terms of the Finance Documents or which arises on or after the date of this Agreement.

(f) By its execution of this Agreement, the BPIAE Agent hereby directs and instructs the Security Agent to execute this Agreement.

0080105-0000405 PA:21116361.7 7

10. GOVERNING LAW

This Agreement and any non-contractual obligations arising out of or in connection with it are governed by English law.

11. ENFORCEMENT

11.1 Jurisdiction of English courts

(a) The courts of England have exclusive jurisdiction to settle any dispute arising out of or in connection with this Agreement (including a dispute relating to the existence, validity or termination of this Agreement) (a Dispute).

(b) The Parties agree that the courts of England are the most appropriate and convenient courts to settle Disputes and accordingly no Party will argue to the contrary.

(c) This Clause 11.1 is for the benefit of the Finance Parties and Secured Parties only. As a result, no Finance Party or Secured Party shall be prevented from taking proceedings relating to a Dispute in any other courts with jurisdiction. To the extent allowed by law, the Finance Parties and Secured Parties may take concurrent proceedings in any number of jurisdictions.

11.2 Arbitration

(a) Notwithstanding the above terms of this Clause, if the BPIAE Agent so elects in writing, any dispute, difference, claim or controversy arising out of or in connection with this Agreement, including any question regarding its existence, validity, interpretation, breach or termination, shall be referred to and finally resolved by arbitration under the London Court of International Arbitration Rules (for the purposes of this Subclause, the Rules).

(b) The Rules are incorporated by reference into this Clause and capitalised terms used in this Clause which are not otherwise defined in this Agreement, have the meaning given to them in the Rules. Any requirement in the Rules to take account of the nationality of a person considered for appointment as an arbitrator shall be disapplied and a person shall be nominated or appointed as an arbitrator (including as Chairman) regardless of his or her nationality.

(c) The number of arbitrators shall be three. The parties agree that the London Court of International Arbitration shall appoint the Arbitral Tribunal without regard to any party's nomination.

(d) Each Obligor and each Finance Party:

(i) expressly agrees and consents to this procedure for nominating and appointing the Arbitral Tribunal; and

(ii) irrevocably and unconditionally waives any right to choose its own arbitrator.

(e) The seat, or legal place of arbitration, shall be London. The language used in the arbitral proceedings shall be English.

11.3 Waiver of trial by jury

0080105-0000405 PA:21116361.7 8

Each party waives any right it may have to a jury trial of any claim or cause of action in connection with any finance document or any transaction contemplated by any finance document. This agreement may be filed as a written consent to trial by the court.

This Agreement has been entered into on the date stated at the beginning of this Agreement.

0080105-0000405 PA:21116361.7 9

SCHEDULE 1

CONDITIONS PRECEDENT

1. Corporate documentation

(a) A copy of the constitutional documents of the Borrower (it being understood and agreed that the copies of the constitutional documents of the Borrower previously delivered to the BPIAE Agent on or prior to the date of this Agreement shall not be required to be redelivered pursuant to this paragraph (1)(a)).

(b) A copy of a resolution of the board of directors or members (as applicable) of the Borrower:

(i) approving the terms of, and the transactions contemplated by, this Agreement and the amended Facility Agreement and resolving that it execute, deliver and perform the amended Facility Agreement and the Agreement;

(ii) authorising a specified person or persons to execute this Agreement on its behalf; and

(iii) authorising a specified person or persons, on its behalf, to sign and/or despatch all documents and notices to be signed and/or despatched by it under or in connection with the amended Facility Agreement and the Agreement.

(c) A specimen of the signature of each person authorised on behalf of the Borrower to enter into the Agreement or to sign or send any document or notice in connection with the amended Facility Agreement and the Agreement (unless previously delivered to the BPIAE Agent on or prior to the date of this Agreement).

(d) A certificate of an authorised officer of the Borrower certifying that:

(i) each copy document specified in paragraph (1)(a) of this Schedule delivered by the Borrower is true and complete as in effect on the date of such certificate, or if previously delivered to the BPIAE Agent, a certification that such documents previously delivered to the BPIAE Agent have not been amended, supplemented or otherwise modified (except for those amendments, modifications, waivers, supplements thereto for which true and complete copies have been provided to the BPIAE Agent) and such documents previously delivered (together with any amendments, modifications, waivers or supplements thereto delivered to the BPIAE Agent, if applicable) remain true and complete copies;

(ii) each copy document specified in paragraph (1)(b) of this Schedule delivered by the Borrower is true and complete and has not been amended, annulled, rescinded or revoked and there exist no other resolutions of the Borrower relating to the matters set forth therein; and

(iii) borrowing or guaranteeing or securing, as appropriate, the Total Commitments would not cause any borrowing, guarantee, security or similar limit binding on it to be exceeded.

2. Legal opinion

0080105-0000405 PA:21116361.7 10

(a) A legal opinion of Milbank under New York law in relation to the capacity of the Borrower and the validity and enforceability of the Aireon HoldCo Share Pledge Agreement, addressed to the BPIAE Agent (for itself and for the benefit of the Lenders) in form and substance reasonably satisfactory to the BPIAE Agent (acting on the instructions of the Lenders).

(b) A legal opinion of Allen & Overy LLP under English law in relation to the validity and enforceability of this Agreement in form and substance reasonably satisfactory to the BPIAE Agent (acting on the instructions of the Lenders).

3. BPIAE Insurance Policy

BPIAE has notified the BPIAE Agent, pursuant to BPIAE’s notification dated 18 December 2018, that it agrees to the amendment of the Facility Agreement as contemplated by this Agreement.

4. Aireon System Debt

(a) Iridium will have, substantially contemporaneously herewith, confirmed in writing that Aireon will have entered into the finance documents relating to the Aireon Financing of at least $200,000,000.

(b) The BPIAE Agent will have received satisfactory evidence that on the date of the initial disbursement under the Aireon Financing, Aireon will make a payment of the Hosting Cost Reimbursement of at least $34,000,000 less any Designated Aireon Receivable payment that is made after the date hereof but prior to the initial disbursement under the Aireon Financing.

(c) The direct agreement to be entered into between, the Borrower, Aireon and DEUTSCHE BANK TRUST COMPANY AMERICAS (as the collateral agent), pursuant to the Aireon Financing isentered intoin substantially theform attached hereto as Schedule 3 (with such amendments as may be agreed by the BPIAE Agent).

(d) The amended and restated Hosting Cost Reimbursement Agreement to be entered into in the frame of the Aireon Financing is entered intoin substantially theform attached hereto as Schedule 4 (with such amendments as may be agreed by the BPIAE Agent).

(e) Confirmation in writing to the BPIAE Agent by or on behalf of the provider of the Aireon System Debt to Aireon that it has no recourse against any member of the NEXT Group or any of the NEXT Group's assets except in relation to (a) the direct agreement referred to in paragraph 4(c) above, (b) the security interests created over the shares of Aireon by Aireon HoldCo and (c) the security interest granted by Aireon over its rights in respect of its agreements with the Borrower and any other member of the NEXT Group.

5. Share Pledge

(a) The Security Agent has entered into the Aireon HoldCo Share Pledge Agreement, in form substantially similar to the Existing Share Pledge Agreement.

(b) Evidence that Aireon HoldCo will own 100% of Aireon’s share capital.

6. Other documents and evidence

0080105-0000405 PA:21116361.7 11

(a) Evidence that all fees, costs and expenses then due and payable from the Borrower under this Agreement have been paid.

(b) An updated Group structure chart.

(c) A copy of any other Authorisation or other document, opinion or assurance which the BPIAE Agentconsiders to be necessary or desirable (if it has notified the Borrower accordingly) in connection with the entry into and performance of the transactions contemplated by, this Agreement or for the validity and enforceability of this Agreement.

7. Miscellaneous

Confirmation by the Borrower that

(a) no Default is continuing or would result from the Facility Agreement being amended in the manner set out in Schedule 2 (Amendments to the Facility Agreement); and

(b) the representations and warranties which are then to be made or deemed to be repeated by each Obligor under this Agreement and the Facility Agreement (including, as applicable, on the Effective Date and under the Facility Agreement, as amended by this Agreement) are true in all material respects.

0080105-0000405 PA:21116361.7 12

SCHEDULE 2

AMENDMENTS TO THE FACILITY AGREEMENT

1. Clause 1.1 (Definitions) is amended by :

(a) inserting a new definition of “Aireon” as follows:

“Aireon means Aireon LLC, a Delaware limited liability company, and any successor entity thereto, provided that it is and remains at all times:

(a)    a Ring Fenced Company;

(b)    a bankruptcy remote, single purpose vehicle whose sole business comprises the Aireon System Project and any transaction incidental to and in support of such project (including the Aireon System Debt); and

(c)    has no Financial Indebtedness other than the Aireon System Debt.”

(b) inserting a new definition of “Aireon Direct Agreement” as follows:

“Aireon Direct Agreement means the direct agreement entered into by Aireon, the Borrower and DEUTSCHE BANK TRUST COMPANY AMERICAS (as the collateral agent) in the frame of the Aireon System Debt.”

(c) in the definition of “Aireon Equity Injection”, replacing the first, third and fourth references to “the Excluded Company” with “Aireon indirectly through Aireon HoldCo”;

(d) replacing the definition of “Aireon Equity Instruments” with the following definition:

Aireon Equity Instruments means equity-linked instruments, capital stock, shares or other equivalent instruments, subordinated debt or other securities issued by Aireon HoldCo, or subordinated debt issued by Aireon, to any member of the Senior Credit Group including any additional contribution made in respect of such instruments, subordinated debt or other securities, which are subject to Transaction Security (until disposed of in accordance with the terms of this Agreement) in favour of the Security Agent.

(e) inserting a new definition of “Aireon HoldCo” as follows:

“Aireon HoldCo means Aireon Holdings LLC, Delaware limited liability company, and any successor entity thereto, provided that it is and remains at all times:

(a) a Ring Fenced Company and, so long as it is a Subsidiary of a member of the NEXT Group, does not own by itself or together with any member of the NEXT Group any Subsidiaries other than Aireon;

(b) a bankruptcy remote, single purpose vehicle whose sole business comprises the Permitted Aireon HoldCo Business; and

(c) has no Financial Indebtedness.”

0080105-0000405 PA:21116361.7 13

(f) in the definition of “Aireon Investment Agreement” replacing all reference to “the Excluded Company” with “Aireon HoldCo”;

(g) inserting a new definition of “Aireon Share Pledge” as follows:

“Aireon Share Pledge means the share pledge granted not earlier than the Seventh Supplemental Effective Date by Aireon HoldCo over its equity interests in Aireon in order to secure the Aireon System Debt.”

(h) replacing the definition of Aireon System Debt by the following definition:

“Aireon System Debt means any Financial Indebtedness incurred by Aireon in connection with the Aireon System Project (including any transaction incidental and in support of the Aireon System Project and including for the avoidance of doubt the “Credit Facility” as such term is defined in theHosting Cost Reimbursement Agreement), provided that the provider of the Financial Indebtedness to Aireon has (and has confirmed in writing (directly or through its agent) to the Borrower and the BPIAE Agent that it has) no recourse against any member of the NEXT Group or any of the NEXT Group's assets (save for specifically identified recourse acceptable to all Lenders).”

(i) in the definition of Aireon System Document replacing all reference to “the Excluded Company” with “Aireon”;

(j) replacing the definition of Airtime Credits Agreement by the following definition:

Airtime Credits Agreement means any agreement or arrangement entered into between Aireon and any member of the Senior Credit Group pursuant to which such member of the Senior Credit Group has agreed, in exchange for Aireon Equity Instruments, to provide and make available (directly or indirectly) to Aireon from time to time Airtime Credits, in an aggregate amount of up to $20,000,000, for application as discharge of the Aireon System Debt owed to Harris Corporation by Aireon, provided that, under no circumstances will Harris Corporation have any recourse to any member of the NEXT Group or any of the NEXT Group's assets in respect of such Aireon System Debt.

(k) in the definition of Designated Aireon Receivable replacing all reference to “the Excluded Company” with “Aireon”:

(l) replacing the definition of Excluded Company with the following definition:

“Excluded Company means each of Aireon and Aireon HoldCo, or such one of them as is required in context.”

For avoidance of doubt, all reference to “Excluded Company” shall be interpreted to refer to each of Aireon and Aireon HoldCo in each of the following definitions: Material Company, NEXT Group, Permitted Joint Venture, Permitted Senior Credit Group Business, and Senior Credit Group.

(m) replacing the definition of Hosting Cost Reimbursement Agreement with the following definition:

0080105-0000405 PA:21116361.7 14

“Hosting Cost Reimbursement Agreement means the hosting cost reimbursement agreement No. IS-12-033 entered into between Iridium Satellite LLC and Aireon LLC on 19 November 2012 as amended and restated on the Seventh Supplemental Effective Date (as amended from time to time).”

(n) replacing the definition of Independent Director with the following definition:

“Independent Director means in relation to each Excluded Company, a director of the Excluded Company, whose vote is separate and independent from that of any board member of the NEXT Group members and whose vote is needed before the filing of any insolvency, reorganization case or proceeding to consolidate or merge the Excluded Company with or into any member of the NEXT Group or sell all or substantially all of its assets or to institute proceedings under any applicable insolvency law or to have the Excluded Company be adjudicated bankrupt or insolvent, to seek any relief under any law relating to relief from debts or the protection of debtors, or consent to the filing or the institution of bankruptcy or insolvency proceedings against the Excluded Company or file a petition seeking, or consent to, reorganization or relief with respect to the Excluded Company under any applicable federal or state law relating to bankruptcy or insolvency, to seek or consent to the appointment of a receiver, liquidator, assignee, trustee, sequestrator, custodian (or other similar official) of or for the Excluded Company or a substantial part of its property, or make any assignment for the benefit of creditors of the Excluded Company, or admit in writing the Excluded Company's inability to pay its debts generally as they become due, or take action in furtherance of any of the foregoing.”

(o) Inserting a new definition of “Iridium Hosting Fee Payment Conditions” as follows:

Iridium Hosting Fee Payment Conditions means the conditions under the Aireon System Debt for the drawdown of funds in order to finance the payment by Aireon to Iridium of the Hosting Cost Reimbursement under the Hosting Cost Reimbursement Agreement.

(p) in the definition of Non Eligible Capital Raising replacing the reference to “the Excluded Company” with “Aireon indirectly through Aireon HoldCo”

(q) in paragraph (d) of the definition of Permitted Acquisition/Investment replacing the first reference to “the Excluded Company” with “the Excluded Companies” and replacing the second reference to “the Excluded Company” with “Aireon indirectly through Aireon HoldCo”

(r) inserting a new definition of “Permitted Aireon HoldCo Business” as follows:

“Permitted Aireon HoldCo Business means:

(a) the maintenance of Aireon HoldCo's legal existence (including the ability to incur and pay, as applicable, reasonable administrative costs and expenses and taxes relating to such maintenance); and

(b) Aireon HoldCo's ownership of equity interests in Aireon and activities reasonably incidental to its status as a shareholder in relation thereto.”

(s) In the definition of Ring Fenced Company:

(i) replacing paragraph (c) of the definition with the following paragraph:

0080105-0000405 PA:21116361.7 15

“does not carry on any trade with, or otherwise contract or deal with a member of the NEXT Group other than, as the case may be, the Aireon System Documents or the Permitted Aireon HoldCo Business, and any other arms-length transaction, undertaken in good faith for its bona fide business purposes;”

(ii) replacing paragraph (l) of the definition with the following paragraph:

“files tax returns, if any, as may be required under applicable law, separately from the members of the NEXT Group;”

(iii) replacing paragraph (n) of the definition with the following paragraph:

“pays its own liabilities and expenses out of its own funds, including the proceeds of the Aireon Equity Injection and, in the case of Aireon HoldCo, including any distributions received from Aireon;”

(t) Inserting a new definition of “Seventh Supplemental Effective Date” as follows:

“Seventh Supplemental Effective Date has the meaning ascribed to the term Effective Date in the Seventh Supplemental Agreement”

(u) Inserting a new definition of “Seventh Supplemental Agreement” as follows:

“Seventh Supplemental Agreement means the supplemental agreement dated 21 December 2018 between the BPIAE Agent and the Borrower relating to certain amendments and waivers to this Agreement”

(v) in the definition of Technical Adviser's Quarterly Report replacing the reference to “the Excluded Company” with “Aireon”

2. Clause 21 (Information Undertakings) is amended by adding the following new Clause 21.13 (Aireon Transaction)

“21.13 (Aireon Transaction)

(a) The Parent shall on each payment date of a Minimum Semi-Annual Payment (as such term is defined in the Hosting Cost Reimbursement Agreement):

(i) inform the BPIAE Agent of the fulfilment (or not) of the Iridium Hosting Fee Payment Conditions (including but not limited to thelevel of “Forward Refinancing DSCR”); and

(ii) communicate details of any drawdown under the Aireon System Debt and the allocation of such funds to be used for operational needs of Aireon, funds used for fees paid relating to the Aireon System Debt and funds used to pay the Hosting Cost Reimbursements.

(b) The Parent shall promptly upon being aware of them, communicate details of any amendment to the Aireon System Debt that may have an impact directly or indirectly on the Iridium Hosting Fee Payment Conditions.

0080105-0000405 PA:21116361.7 16

3. Clause 22.1(d) is amended by adding the words “(directly or indirectly)” immediately after the words “from Aireon”.

4. Clause 23.33 (Aireon Transaction) is amended by:

(a) replacing paragraph (a) with the following paragraph:

“The Parent shall ensure that each Excluded Company is and remains at all times:

(i) a Ring Fenced Company; which in the case of Aireon HoldCo, to the extent it is a Subsidiary of a member of the NEXT Group, does not own by itself or together with any member of the NEXT Group any Subsidiaries (other than its ownership of equity interests in Aireon);

(ii) a bankruptcy remote, single purpose vehicle whose sole business comprises, in the case of Aireon, the Aireon System Project and any transaction incidental and in support of such project (including the Aireon System Debt) or, in the case of Aireon HoldCo, the Permitted Aireon HoldCo Business; and

(iii) has no Financial Indebtedness other than the Aireon System Debt.”

(b) replacing paragraph (b) with the following paragraph:

“The Parent shall ensure that, except as contemplated by Section 3.6.4 of the Limited Liability Company Agreement of Aireon HoldCo, dated as of to be entered into on or around the date hereof (the Identified Aireon Disposal Agreement), no member of the NEXT Group will enter into a single transaction or a series of transactions (whether related or not and whether voluntary or involuntary) to sell, lease, transfer or otherwise dispose of any Aireon Equity Instruments prior to NEXT System Completion.”

(c) replacing paragraph (e) with the following paragraph:

“The Borrower shall not enter into (i) any amendment of the Hosting Cost Reimbursement Agreement or any other agreement or contract (including the Aireon Direct Agreement or any other document entered into by the Borrower in relation to the Aireon System Debt) or (ii) any new agreement or contract, in each case to the extent that such amendment or new agreement or contract could reasonably be expected to have the effect of modifying the conditions, timing or amount of payments under the Hosting Cost Reimbursement Agreement (including by way of subordination, assignment, security or turnover), without the prior written consent of the BPIAE Agent acting on the instructions of all Lenders.”

5. The following new Clause 23.34 (Aireon HoldCo) is inserted in place of the existing Clause 23.34 (which has been reserved):

“23.34 Aireon HoldCo

(a) The Borrower shall ensure that Aireon HoldCo:

(i) will not trade, carry on any business or activity, own any assets or incur any liabilities except for Permitted Aireon HoldCo Business;

0080105-0000405 PA:21116361.7 17

(ii) will not acquire any asset or company or any shares or securities or a business or undertaking (or, in each case, any interest in any of them) or incorporate a company (in each case other than as is reasonably incidental to paragraph (b) of “Permitted Aireon HoldCo Business”);

(iii) will not create or permit to subsist any Security over any of its assets, except for the Aireon Share Pledge;

(iv) subject to enforcement of the Aireon Share Pledge, will remain the sole 100% shareholder of Aireon; and

(v) will not incur or allow to remain outstanding any guarantee in respect of any obligation of any person (other than in respect of the Aireon System Debt).

(b) The Borrower shall promptly provide to the BPI Agent:

(i) all information it receives in relation to the status of conditions, timing or amounts of payments (including any deferral of the originally scheduled date of payment) of the Designated Aireon Receivable;

(ii) all information it obtains in any capacity in relation to an event of default, a potential event of default, an acceleration action or enforcement action under the Aireon System Debt (including pursuant to an “Enforcement Notice” or a “Substitution Notice” as such terms are defined in the Aireon Direct Agreement); and

(iii) all information it obtains in any capacity in relation to any events arising under the Aireon System Debt which may have an adverse consequence on (x) the conditions, timing or amount of payments of the Designated Aireon Receivable, (y) the value of the Charged Property or (z) the rights of the Finance Parties hereunder.

(c) Notwithstanding clause (b) above, the Borrower shall not be required to provide and disclose any information, reports, notices, documents and communications that (i) (x) were provided to the Borrower by the Excluded Company in connection with the Excluded Company obtaining legal services from Borrower (or certain of its employees) or (y) constitute attorney work product prepared by the Borrower (or certain of its employees) for the benefit of the Excluded Company, in each case, to the extent such disclosure would constitute a breach of the attorney-client privilege established between the Borrower (or certain of its employees) and the Excluded Company; (ii) would violate any applicable law or order; or (iii) would violate any nondisclosure or confidentiality agreement to which the Borrower is a party.

(d) If the Aireon Share Pledge is enforced the Borrower shall notify the BPIAE Agent promptly upon becoming aware of the same and promptly enter into discussions with the BPIAE Agent and the Lenders for a period of 60 days after such notification in order to identify the direct or indirect adverse consequences of the enforcement and reach an agreement to remedy or mitigate such adverse consequences. If a remedial course of action is agreed, the Borrower shall, as soon as reasonably practicable thereafter (but in any case within 10 Business Days), provide to the BPIAE Agent a copy of its remedial plan (which shall substantially reflect the discussions between the Borrower and the BPIAE Agent and the Lenders) to resolve such adverse consequences. The Borrower shall diligently carry out and comply with any course of action detailed in its remedial plan.”

0080105-0000405 PA:21116361.7 18

6. The existing Clause 24.20 (Acceleration) is renumerated 24.21 and the following new Clause 24.20 (Hosting Cost Reimbursement) is added:

“24.20 Hosting Cost Reimbursement

The payment of Hosting Cost Reimbursement of at least $34,000,000 (less any Designated Aireon Receivable payment that is made after the date of the Seventh Supplemental Agreement but prior to the Seventh Supplemental Effective Date) that was to be made on the date of the initial disbursement under the Aireon System Debt has not been made on the Seventh Supplemental Effective Date.”

0080105-0000405 PA:21116361.7 19

SCHEDULE 3

FORM OF DIRECT AGREEMENT

0080105-0000405 PA:21116361.7 20

SCHEDULE 4

FORM OF AMENDED AND RESTATED HOSTING COST REIMBURSEMENT AGREEMENT

0080105-0000405 PA:21116361.7 21

SIGNATORIES

Parent

IRIDIUM COMMUNICATIONS INC.

By: /s/ Thomas J. Fitzpatrick

Name: Thomas J. Fitzpatrick

Title: Chief Financial Officer

Borrower

IRIDIUM SATELLITE LLC

By: /s/ Thomas J. Fitzpatrick

Name: Thomas J. Fitzpatrick

Title: Chief Financial Officer

Obligors

IRIDIUM COMMUNICATIONS INC.

By: /s/ Thomas J. Fitzpatrick

Name: Thomas J. Fitzpatrick

Title: Chief Financial Officer

IRIDIUM HOLDINGS LLC

By: /s/ Thomas J. Fitzpatrick

Name: Thomas J. Fitzpatrick

Title: Chief Financial Officer

IRIDIUM CARRIER HOLDINGS LLC

By: /s/ Thomas J. Fitzpatrick

Name: Thomas J. Fitzpatrick

Title: Chief Financial Officer

IRIDIUM CARRIER SERVICES LLC

By: /s/ Thomas J. Fitzpatrick

Name: Thomas J. Fitzpatrick

Title: Chief Financial Officer

IRIDIUM CONSTELLATION LLC

By: /s/ Thomas J. Fitzpatrick

Name: Thomas J. Fitzpatrick

0080105-0000405 PA:21116361.7 22

Title: Chief Financial Officer

IRIDIUM GOVERNMENT SERVICES LLC

By: /s/ Thomas J. Fitzpatrick

Name: Thomas J. Fitzpatrick

Title: Chief Financial Officer, Iridium Constellation LLC, its Manager

SYNCOM-IRIDIUM HOLDINGS CORP.

By: /s/ Thomas J. Fitzpatrick

Name: Thomas J. Fitzpatrick

Title: Chief Financial Officer

IRIDIUM BLOCKER-B INC.

By: /s/ Thomas J. Fitzpatrick

Name: Thomas J. Fitzpatrick

Title: Chief Financial Officer

IRIDIUM SATELLITE SA LLC

By: /s/ Thomas J. Fitzpatrick

Name: Thomas J. Fitzpatrick

Title: Chief Financial Officer, Iridium Satellite LLC, its Manager

BPIAE Agent

SOCIÉTÉ GÉNÉRALE

By: /s/ Florian Degunst

Name: Florian Degunst

Title: Structured Finance Middle Office Operations, Senior Officer

By: /s/ Benjamin Graisely

Name: Benjamin Graisely

Title:

Security Agent

DEUTSCHE BANK TRUST COMPANY AMERICAS

By: /s/ Randy Kahn

Name: Randy Kahn

Title: Vice President

By: /s/ Kathleen Gannaway

Name: Kathleen Gannaway

Title: Vice President

0080105-0000405 PA:21116361.7 23

EX-10.47

EXHIBIT 10.47

AMENDMENT N° 33

TO THE

FULL SCALE SYSTEM DEVELOPMENT CONTRACT

No. IS-10-021

Between

IRIDIUM SATELLITE LLC

And

THALES ALENIA SPACE FRANCE

for the

IRIDIUM NEXT SYSTEM

Execution Copy

*** Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended.

PREAMBLE

This Amendment N° 33 (the “Amendment”) to the Full Scale System Development Contract No. IS-10-021 signed on June 1, 2010 between Iridium Satellite LLC and Thales Alenia Space France for the Iridium NEXT System, as amended, (the “Contract”) is entered into on this 10^th day of October, 2018 by and between Thales Alenia Space France, a company organized and existing under the laws of France, having its registered office at 26 avenue Jean François Champollion 31100 Toulouse – FRANCE (“Contractor”), and Iridium Satellite LLC, a limited liability company organized under the laws of Delaware, having an office at 1750 Tysons Boulevard, Suite 1400, McLean, VA 22102 - USA (“Purchaser”).

RECITALS

WHEREAS, Purchaser and Contractor have engaged in discussions relating to changes the Parties would like to incorporate in the Contract; and

WHEREAS, the Parties now desire to amend Article 4 and Exhibit D of the Contract in accordance with the terms and conditions provided for in the Amendment.

NOW, THEREFORE, in consideration of the premises and for good and valuable consideration, the receipt and adequacy of which are hereby expressly acknowledged, and intending to be legally bound, the Parties hereby agree as follows:

Article 1: Capitalized terms used but not defined in this Amendment shall have the meanings ascribed thereto in the Contract or any amendments thereto, as the case may be.

Article 2: The Parties have agreed that Contractor shall update the [***] to: (i) implement change to [***]; (ii) add [***]; and (iii) add a new [***], as approved by the Parties.

Article 3: The Base Contract Price set forth in Article 4.1 of the Contract is hereby increased by the amount of [***] U.S. Dollars (US$[***]) to a new Base Contract Price of no more than [***] U.S. Dollars (US$[***]).

Article 4: The Payment Plan is hereby revised by the addition of the following new Milestones.

[***]

Article 5: This Amendment may be executed and delivered (including via facsimile or other electronic means) in one or more counterparts, each of which shall be deemed to be an original, but all of which shall constitute one and the same agreement.

Article 6: All other provisions of the Contract not expressly referred to in this Amendment remain in full force and effect.

1

Execution Copy    Iridium / Thales Alenia Space Confidential & Proprietary

*** Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended.

IN WITNESS WHEREOF, the Parties have executed this Amendment by their duly authorized officers as of the date set forth in the Preamble.

IRIDIUM SATELLITE LLCTHALES ALENIA SPACE FRANCE

/s/ S. Scott Smith/s/ Denis Allard            

S. Scott Smith                        Denis Allard

Chief Operating Officer                Vice President

        Iridium Program Director

2

Execution Copy    Iridium / Thales Alenia Space Confidential & Proprietary

*** Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended.

EX-10.83

EXHIBIT 10.83

December 11, 2018

TO:    The Board of Directors of Iridium Communications Inc. (the “Board”)

RE:    Compensation Program for Non-Employee Directors

Adoption of 2019 Compensation Program for Non-Employee Directors

The Board is being requested to adopt the 2019 compensation program for its non-employee members, which program will be effective as of January 1, 2019. The terms of the program are set forth in the Compensation Program for Non-Employee Directors (the “Program”) and are briefly summarized below.

Annual Board Retainer (Amount and Default Payment Mechanic): The Program provides that each non-employee director will receive an Annual Board Retainer in the amount of $175,000, which amount is payable: (i) $50,000 in cash (unless the director makes a timely election to receive all or a portion of this cash component of the Annual Board Retainer in the form of Restricted Stock Units (“RSUs”), or in any mix of cash and RSUs, subject to the limitations described below); and (ii) $125,000 in RSUs. Cash will be paid quarterly in arrears on or as soon as practicable after the last day of each calendar quarter in which service occurred.

Annual Chairman of the Board and Committee Chair Retainers (Amounts and Default Payment Mechanic): The Chairman of the Board will receive an additional annual retainer of $50,000 and the Chairs of the Audit, Compensation, and Nominating and Corporate Governance Committees will receive an additional annual retainer of $40,000, $15,000 and $10,000, respectively, all of which amounts are payable in cash quarterly in arrears on or as soon as practicable after the last day of each calendar quarter in which service occurred (unless the director makes a timely election to receive all or a portion of such retainer in the form of RSUs, or in any mix of cash and RSUs, subject to the limitations described below).

Annual Committee Member Retainers (Amounts and Default Payment Mechanic): The members of the Audit, Compensation, and Nominating and Corporate Governance Committees who are not serving as the chairperson of the committee will receive an additional annual retainer of $20,000, $7,500 and $5,000, respectively, all of which amounts are payable in cash quarterly in arrears on or as soon as practicable after the last day of each calendar quarter in which service occurred (unless the director makes a timely election to receive all or a portion of such retainer in the form of RSUs, or in any mix of cash and RSUs, subject to the limitations described below).

Annual Government Advisory Committee Retainer (Amounts and Payment Mechanic): Non-employee directors serving on the Government Advisory Committee during 2019 will receive an additional annual retainer of $15,000 in the form of RSUs, subject to vesting and the limitations described below regarding RSU grants. Non-employee directors serving on the Government Advisory Committee may not make an election to receive the Annual Government Advisory Committee Retainer in any other form.

Compensation Elections: Elections must be made annually. Please complete the 2019 Election Form. This Election Form must be submitted by December 31, 2018 to be valid for 2019. Once the Election Form is submitted for a year, the elections made are irrevocable for that year.

Annual Board Retainer Elections: Non-employee directors may elect to receive all or a portion of $50,000 of the Annual Board Retainer in cash or RSUs (elections to receive cash or RSUs must be made in 5% increments). The remaining $125,000 of the Annual Board Retainer is paid in the form of RSUs and no election may be made with respect to such amount.

Annual Chairman of the Board, Committee Chair and Committee Member Retainers Elections: Non-employee directors may elect to receive all or a portion of the Annual Chairman of the Board Retainer, Annual Committee Chair Retainers and/or Annual Committee Member Retainers, if any, in cash or RSUs (elections to receive cash or RSUs must be made in 25% increments).

RSUs: All RSUs are governed by our Amended and Restated 2015 Equity Incentive Plan (the “Plan”) and the Non-Employee Director Restricted Stock Unit Agreement and will be granted on the third business day in January. Any vested RSUs will be settled in Iridium stock on the earlier of (i) the date that is six months and one day after “separation from service” (as defined in Treasury Regulations Section 1.409A-1(h), without regard to alternate definitions thereunder) as a director (a “Separation from Service”) and (ii) a Change in Control, as defined in the Plan, that also constitutes a “change in control event” (as determined under Treasury Regulations Section 1.409A-3(i)(5)) (a “Change in Control”). RSUs will be taxable at ordinary income rates when shares are issued, based on the fair market value (“FMV”) of the shares at the time of issuance.

Vesting: All RSUs granted as Annual Board Retainers, Annual Chairman of the Board Retainer, Annual Committee Chair Retainers, Annual Committee Member Retainers and Annual Government Advisory Committee Retainers will vest on the first anniversary of the date of grant, subject to the non-employee director’s continuous service as a director through such date. All RSUs granted to non-employee directors are subject to full acceleration of vesting upon a termination for death or disability. Any unvested RSUs are forfeited upon a termination as a director for any reason other than death or disability.

IRIDIUM COMMUNICATIONS INC. COMPENSATION PROGRAM FOR NON-EMPLOYEE DIRECTORS

EFFECTIVE DATE: January 1, 2019

GENERAL: Each member of the board of directors (the “Board”) of Iridium Communications Inc. (the “Company”) who is not an Employee (as defined in the Iridium Communications Inc. Amended and Restated 2015 Equity Incentive Plan (the “Equity Incentive Plan”)) (each, a “Non-Employee Director”) will be eligible to receive cash and equity-based compensation as set forth in this Iridium Communications Inc. Compensation Program for Non-Employee Directors (this “Program”). Capitalized terms not explicitly defined in this Program but defined in the Equity Incentive Plan will have the same definitions as in the Equity Incentive Plan.

ANNUAL COMPENSATION:

• Annual Board Retainer: $175,000 will be payable for each calendar year to each Non-Employee Director as follows:

• $50,000 in the form of cash (the “Annual Cash Retainer”), unless the Non-Employee Director makes a timely election to receive all or a portion of the Annual Cash Retainer in the form of restricted stock units (“RSUs”) (subject to the limitations described below); and

• $125,000 in the form of RSUs (the “Annual Stock Retainer”).

• Annual Committee Chair Retainers: The following amounts will be payable for each calendar year to each chairperson of the following committees of the Board (each, a “Committee”) in the form of cash, unless the Non-Employee Director makes a timely election to receive all or a portion of the Annual Committee Chair Retainer in the form of RSUs (subject to the limitations described below):

• Audit – $40,000;

• Compensation – $15,000; and

• Nominating and Corporate Governance – $10,000.

• Annual Committee Member Retainers: The following amounts will be payable for each calendar year to each member of the following Committees who is not serving as the chairperson of the Committee in the form of cash, unless the Non-Employee Director makes a timely election to receive all or a portion of the Annual Committee Member Retainer in the form of RSUs (subject to the limitations described below):

• Audit – $20,000;

• Compensation – $7,500; and

• Nominating and Corporate Governance – $5,000.

• Annual Chairman of the Board Retainer: $50,000 will be payable for each calendar year to the chairman of the Board in the form of cash, unless the Non-Employee Director makes a timely election to receive all or a portion of the Annual Chairman of the Board Retainer in the form of RSUs (subject to the limitations described below).

• Annual Government Advisory Committee Retainer: $15,000 will be payable for each calendar year in the form of RSUs to each Non-Employee Director serving on the Company’s Government Advisory Committee during a calendar year (subject to the limitations described below). Non-Employee Directors serving on the Government Advisory Committee may not make an election to receive the Annual Government Advisory Committee Retainer in any other form.

• Partial Year of Service: Notwithstanding the foregoing or anything in this Program to the contrary, if a Non-Employee Director’s service as a Non-Employee Director (for purposes of any Annual Cash Retainer or Annual Stock Retainer) or as a chairperson of a Committee (for purposes of any Annual Committee Chair Retainer) or as a member of a Committee (for purposes of any Annual Committee Member Retainer) or as a chairman of the Board (for purposes of any Annual Chairman of the Board Retainer) or as a member of the Government Advisory Committee (for purposes of the Annual Government Advisory Committee Retainer) commences or terminates after the beginning of a calendar year, then the Non-Employee Director will only be eligible to receive 25% of the full amount of the applicable retainer (each as set forth above), in the applicable form, for each partial or full calendar quarter of such service completed during such calendar year. Notwithstanding the foregoing, upon termination of service as a Director any portion of any retainer paid in the form of RSUs will be forfeited to the extent not vested on the date of or as a result of such termination in accordance with the terms of this Program.

TIMING OF ELECTIONS; TIMING AND FORM OF PAYMENTS (OTHER THAN ANNUAL GOVERNMENT ADVISORY COMMITTEE RETAINER):

• Current Non-Employee Directors:

Annual Cash Retainer, Annual Committee Chair Retainer, Annual Committee Member Retainer and Annual Chairman of the Board Retainer: If a Non-Employee Director’s service as a Non-Employee Director commences prior to the beginning of a calendar year, then the Non-Employee Director must make an election, prior to the beginning of such calendar year, with respect to (i) his or her Annual Cash Retainer for such calendar year and (ii) any Annual Committee Chair Retainer, Annual Committee Member Retainer or Annual Chairman of the Board Retainer that is or may become payable for such calendar year. Each Annual Cash Retainer, Annual Committee Chair Retainer, Annual Committee Member Retainer and Annual Chairman of the Board Retainer will be paid or granted as follows:

• Cash: The portion (if any) of each Annual Cash Retainer, Annual Committee Chair Retainer, Annual Committee Member Retainer and Annual Chairman of the Board Retainer that is to be paid in the form of cash will be determined based on such election. Such portion will be paid in the form of cash in arrears in equal installments over the applicable number of calendar quarters during such calendar year, with payment occurring on or as soon as practicable after the last day of the applicable calendar quarter and in all cases not later than March 15 of the calendar year following the calendar year in which it was earned.

• Stock: The portion (if any) of each Annual Cash Retainer, Annual Committee Chair Retainer, Annual Committee Member Retainer and Annual Chairman of the Board Retainer that is to be granted in the form of RSUs will be determined based on such election. Such portion will be granted in the form of RSUs on the third business day in January of such calendar year. Any such award will vest in full on the first anniversary of the date of grant of the award, provided that the Non-Employee Director is in service as a Director on such vesting date.

Notwithstanding the foregoing, if the Non-Employee Director becomes a chairperson of a Committee, a member of a Committee or chairman of the Board after the third business day in January of such calendar year, then the portion (if any) of his or her Annual Committee Chair Retainer, Annual Committee Member Retainer or Annual Chairman of the Board Retainer, as applicable, that is to be granted in the form of RSUs will be granted on the third business day after the date that the Non-Employee Director becomes a chairperson of a Committee, a member of a Committee or chairman of the Board, as applicable. Any such award will vest in full on the first anniversary of the date of grant of the award, provided that the Non-Employee Director is in service as a Director on such vesting date.

Annual Stock Retainer: A Non-Employee Director may not make an election regarding the form of payment of his or her Annual Stock Retainer; the Annual Stock Retainer is paid in the form of RSUs. If a Non-Employee Director’s service as a Non-Employee Director commences prior to the beginning of a calendar year, then the RSUs will be granted on the third business day in January of the calendar year. The RSUs will vest in full on the first anniversary of the date of grant, provided that the Non-Employee Director is in service as a Director on such vesting date.

• New Non-Employee Directors:

Annual Cash Retainer, Annual Committee Chair Retainer, Annual Committee Member Retainer and Annual Chairman of the Board Retainer: If a Non-Employee Director’s service as a Non-Employee Director commences on or after the beginning of a calendar year, then the Non-Employee Director must make an election, within 30 days following the commencement of such service, with respect to (i) his or her Annual Cash Retainer for such calendar year and (ii) any Annual Committee Chair Retainer, Annual Committee Member Retainer or Annual Chairman of the Board Retainer that is or may become payable for such calendar year; provided, however, that (a) such election will be applicable only to the portion of the applicable Annual Cash Retainer, Annual Committee Chair Retainer, Annual Committee Member Retainer or Annual Chairman of the Board Retainer payable for any calendar quarter during such calendar year that begins after the date of such election, and (b) no such election may be made if such service commences during the final calendar quarter of such calendar year. Each such Annual Cash Retainer, Annual Committee Chair Retainer, Annual Committee Member Retainer and Annual Chairman of the Board Retainer will be paid or granted as follows:

• Cash: 25% of the full amount of an Annual Cash Retainer (and Annual Committee Chair Retainer, Annual Committee Member Retainer and Annual Chairman of the Board Retainer, if applicable), as set forth under “Annual Compensation” above, will be paid in the form of cash for (i) the calendar quarter in which the Non-Employee Director’s service as a Non-Employee Director, chairperson of a Committee, member of a Committee or chairman of the Board, as applicable, commences and, (ii) if later, for the calendar quarter in which such election is made, with payment occurring on or as soon as practicable after the last day of the applicable calendar quarter and in all cases not later than March 15 of the calendar year following the calendar year in which it was earned.

With respect to any calendar quarter during such calendar year that begins after the date of such election, the portion (if any) of the Annual Cash Retainer, Annual Committee Chair Retainer, Annual Committee Member Retainer or Annual Chairman of the Board Retainer that is to be paid in the form of cash will be determined based on such election. Such portion will be paid in the form of cash in arrears in equal installments over the applicable number of calendar quarters during such calendar year, with payment occurring on or as soon as practicable after the last day of the applicable calendar quarter and in all cases not later than March 15 of the calendar year following the calendar year in which it was earned.

• Stock: With respect to any calendar quarter during such calendar year that begins after the date of such election, the portion (if any) of an Annual Cash Retainer, Annual Committee Chair Retainer, Annual Committee Member Retainer or Annual Chairman of the Board Retainer that is to be granted in the form of RSUs will be determined based on such election. Such portion will be granted in the form of RSUs on the first business day of the first calendar quarter that begins after the date of such election. Any such award will vest in full on the first anniversary of the date of grant of the award, provided that the Non-Employee Director is in service as a Director on such vesting date.

Notwithstanding the foregoing, if the Non-Employee Director becomes a chairperson of a Committee, a member of a Committee or chairman of the Board after the first business day of the first calendar quarter that begins after the date of such election, then the portion (if any) of his or her Annual Committee Chair Retainer, Annual Committee Member Retainer or Annual Chairman of the Board Retainer, as applicable, that is to be granted in the form of RSUs, will be granted on the third business day after the date that the Non-Employee Director becomes a chairperson of a Committee, a member of a Committee or chairman of the Board, as applicable. Any such award will vest in full on the first anniversary of the date of grant of the award, provided that the Non-Employee Director is in service as a Director on such vesting date.

Annual Stock Retainer: A Non-Employee Director may not make an election regarding the form of payment of his or her Annual Stock Retainer; the Annual Stock Retainer is paid in the form of RSUs. If a Non-Employee Director’s service as a Non-Employee Director commences on or after the beginning of a calendar year, a pro-rated portion of the Annual Stock Retainer for a partial year of service, as set forth under “Annual Compensation” above, will be granted in the form of RSUs on the first business day of the first calendar quarter that begins after the date such Non-Employee Director commences service; provided, however, that if such service commences during the final calendar quarter of such calendar year, such award will be granted on the last day of such calendar year. The Annual Stock Retainer will be pro-rated based on the number of calendar quarters during the year during which the Non-Employee Director will serve on the Board. Any such award will vest in full on the first anniversary of the date of grant of the award, provided that the Non-Employee Director is in service as a Director on such vesting date.

TERMS OF ELECTIONS:

• Once an election is submitted for a calendar year, it will be irrevocable with respect to such calendar year.

• A Non-Employee Director must submit a new election for each calendar year.

• Elections must be allocated in multiples as follows:

• Allocation of the Annual Cash Retainer must be made among cash and RSUs in multiples of 5%.

• Allocation of the Annual Committee Chair Retainer, Annual Committee Member Retainer and/or Annual Chairman of the Board Retainer must be made among cash and RSUs in multiples of 25%.

TIMING OF ANNUAL GOVERNMENT ADVISORY COMMITTEE RETAINER

• Current Non-Employee Directors Serving on Government Advisory Committee: If a Non-Employee Director’s service on the Government Advisory Committee commences prior to the beginning of a calendar year, then the Non-Employee Director’s Annual Government Advisory Committee Retainer paid in the form of RSUs will be granted on the third business day in January of such calendar year and will vest on the first anniversary of the date of grant, provided that the Non-Employee Director is in service as a Director on such vesting date.

• Non-Employee Directors Commencing Service on Government Advisory Committee: If a Non-Employee Director commences service on the Government Advisory Committee on or after the beginning of a calendar year, then the Non-Employee Director’s Annual Government Advisory Committee Retainer paid in the form of RSUs, as set forth under “Annual Compensation” above, will be pro-rated based on the number of calendar quarters during the year during which the Non-Employee Director will serve on the Committee and will be granted on the first business day of the first calendar quarter that begins after the date the Non-Employee Director commences service on the Government Advisory Committee provided, however, that if such service commences during the final calendar quarter of such calendar year, such award will be granted on the last business day of such calendar year. The RSUs will vest in full on the first anniversary of the date of grant, provided that the Non-Employee Director is in service as a Director on such vesting date.

TERMS OF EQUITY-BASED AWARDS:

• Any RSUs described in this Program will be granted under the Equity Incentive Plan and will be subject to the terms and conditions of (i) this Program, (ii) the Equity Incentive Plan and (iii) the forms of RSU grant notice and agreement approved by the Board for the grant of such awards to Non-Employee Directors.

• Unless a number of units is otherwise set forth in this Program, the actual number of units subject to any RSUs granted pursuant to this Program will be determined by dividing the dollar amount allocated to such award by the Fair Market Value of a share of the Company’s common stock on the day on which the RSU is granted.

• Any vested RSUs granted pursuant to this Program will be settled in shares of the Company’s common stock on the earlier of (i) six months and one day after a Non-Employee Director’s “separation from service” (as such term is defined in Treasury Regulations Section 1.409A-1(h) without regard to any alternative definition thereunder) as a Director (a “Separation from Service”) for any reason or (ii) a Change in Control that also constitutes a “change in control event” (as determined under Treasury Regulations Section 1.409A-3(i)(5)) (a “Change in Control”).

• With respect to any outstanding RSUs granted pursuant to this Program, if a Non-Employee Director’s service as a Director is terminated:

• due to the Non-Employee Director’s death or Disability, any unvested portion of any such award will become fully vested upon such termination; or

• due to any reason other than death or Disability or Cause, any unvested portion of any such award will be forfeited to the Company.

EXPENSES: Each Non-Employee Director will be eligible for reimbursement from the Company for all reasonable out-of-pocket expenses incurred by the Non-Employee Director in connection with his or her attendance at Board and Committee meetings. To the extent that any taxable reimbursements are provided to a Non-Employee Director, they will be provided in accordance with Section 409A of the Code and any applicable state law of similar effect, including, but not limited to, the following provisions: (i) the amount of any such expenses eligible for reimbursement during the Non-Employee Director’s taxable year may not affect the expenses eligible for reimbursement in any other taxable year; (ii) the reimbursement of an eligible expense must be made no later than the last day of the Non-Employee Director’s taxable year that immediately follows the taxable year in which the expense was incurred; and (iii) the right to any reimbursement may not be subject to liquidation or exchange for another benefit.

SECTION 409A: Notwithstanding anything to the contrary in this Program, if a Director is deemed by the Company at the time of such Director’s “separation from service” (as such term is defined in Treasury Regulations Section 1.409A-1(h) without regard to any alternative definition thereunder) with the Company to be a “specified employee” for purposes of Section 409A(a)(2)(B)(i) of the Code, and if any of the payments upon such separation from service set forth herein and/or under any other agreement with the Company are deemed to be “deferred compensation,” then to the extent delayed commencement of any portion of such payments is required to avoid a prohibited distribution under Section 409A(a)(2)(B)(i) of the Code and the related adverse taxation under Section 409A of the Code, such payments shall not be provided to such Director prior to the earliest of (i) the date that is six months and one day after the date of such separation from service, (ii) the date of the Director’s death, or (iii) such earlier date as permitted under Section 409A of the Code without the imposition of adverse taxation. Upon the first business day following the expiration of such applicable Code Section 409A(a)(2)(B)(i) period, all payments deferred pursuant to this paragraph shall be paid in a lump sum to the Director, and any remaining payments due shall be paid as otherwise provided herein or in the applicable agreement.

IRIDIUM COMMUNICATIONS INC. Compensation Program for Non-Employee Directors 2019 Election Form
Name (Last, First, Middle Initial)		Social Security Number			Date of Birth
Address	City			State			Zip Code
Date of Election to Board of Directors			Date of Participation in Program			Primary Phone Number
By signing below, I certify that I have read and understand the terms of the Iridium Communications Inc. Compensation Program for Non-Employee Directors (the “Program”) and voluntarily elect the compensation allocations listed below. By signing below, I also understand that (i) to be valid, my election must be received by Iridium by no later than December 31, 2018, (ii) my election may not be revoked or changed once made, (iii) if I do not make a timely election, I will be paid my Annual Board Retainer $50,000 in cash and $125,000 in restricted stock units and 100% of any other retainer I am eligible to receive in cash and (iv) any compensation I elect to receive as restricted stock units (if vested) will not be paid out to me until six months and one day after my separation from service (as defined under Treasury Regulations Section 1.409A-1(h)) as a director (or, if earlier, on a Change in Control (as defined in the Iridium Communications Inc. Amended and Restated 2015 Equity Incentive Plan) that also constitutes a “change in control event” (as determined under Treasury Regulations Section 1.409A-3(i)(5)).
2019 Compensation Allocation — Annual Board Retainer The Annual Board Retainer ($175,000) consists of (i) an Annual Cash Retainer ($50,000) and (ii) an Annual Stock Retainer ($125,000). The election for the Annual Cash Retainer may be allocated among cash and restricted stock units in multiples of 5%. Note: This election will apply only to the Annual Cash Retainer. An election may not be made with respect to the Annual Stock Retainer. The Annual Stock Retainer will be paid 100% in restricted stock units.
I hereby elect the following allocation for my 2019 Annual Cash Retainer:
Annual Cash Retainer ($50,000): Cash ___% Restricted Stock Units ___% Total Percentage = 100%
2019 Compensation Allocation — Annual Committee Chair Retainer, Annual Committee Member Retainer or Annual Chairman of Board Retainer The election for the Annual Committee Chair Retainer, Annual Committee Member Retainer and/or Annual Chairman of the Board Retainer may be allocated among cash and restricted stock units in multiples of 25%. Note: This election will apply to any Annual Committee Chair Retainer, Annual Committee Member Retainer and/or Annual Chairman of the Board Retainer that is or may become payable for 2019. An election may not be made with respect to the Annual Government Advisory Committee Retainer, if applicable.
I hereby elect the following allocation for my 2019 Annual Committee Chair Retainer, Annual Committee Member Retainer and/or Annual Chairman of the Board Retainer (if any):
Annual Committee Chair Retainer: Cash ___% Restricted Stock Units ___% Total Percentage = 100%				Annual Committee Member Retainer: Cash ___% Restricted Stock Units ___% Total Percentage = 100%
Annual Chairman of the Board Retainer: Cash ___% Restricted Stock Units ___% Total Percentage = 100%
SIGNATURE DirectorDate

1.

193306925 v2

EX-21.1

EXHIBIT 21.1

SUBSIDIARIES OF IRIDIUM COMMUNICATIONS INC.

Subsidiary	Jurisdiction of Organization
Iridium Blocker-B Inc.	Delaware
Syncom-Iridium Holdings Corp.	Delaware
Iridium Holdings LLC	Delaware
Iridium Satellite LLC	Delaware
Iridium Constellation LLC	Delaware
Iridium Carrier Holdings LLC	Delaware
Iridium Carrier Services LLC	Delaware
Iridium Government Services LLC	Delaware
OOO Iridium Services	Russia
OOO Iridium Communications	Russia
Iridium Norway A/S	Norway
Iridium Chile SpA	Chile

EX-23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statements (Form S-3 Nos. 333-162206 and 333-165513 and Form S-8 Nos. 333-165508, 333-181744, 333-204236 and 333-218073) of Iridium Communications Inc. of our reports dated February 28, 2019, with respect to the consolidated financial statements of Iridium Communications Inc. and the effectiveness of internal control over financial reporting of Iridium Communications Inc. included in this Annual Report (Form 10-K) of Iridium Communications Inc. for the year ended December 31, 2018.

/s/ Ernst & Young LLP

Tysons, Virginia

February 28, 2019

EX-31.1

Exhibit 31.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

Pursuant to Section 302 of The Sarbanes-Oxley Act of 2002

I, Matthew J. Desch, certify that:

1. I have reviewed this annual report on Form 10-K of Iridium Communications Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 28, 2019	/s/ Matthew J. Desch
	Matthew J. Desch
	Chief Executive Officer (principal executive officer)

EX-31.2

Exhibit 31.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

Pursuant to Section 302 of The Sarbanes-Oxley Act of 2002

I, Thomas J. Fitzpatrick, certify that:

1. I have reviewed this annual report on Form 10-K of Iridium Communications Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 28, 2019	/s/ Thomas J. Fitzpatrick
	Thomas J. Fitzpatrick
	Chief Financial Officer (principal financial officer)

EX-32.1

Exhibit 32.1

CERTIFICATIONS OF

PRINCIPAL EXECUTIVE OFFICER AND PRINCIPAL FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, the Chief Executive Officer and the Chief Financial Officer of Iridium Communications Inc. (the “Company”) each hereby certifies that, to the best of his knowledge:

1. The Company’s Quarterly Report on Form 10-K for the fiscal year ended December 31, 2018, to which this Certification is attached as Exhibit 32.1 (the “Form 10-K”), fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934, as amended; and

2. The information contained in the Form 10-K fairly presents, in all material respects, the financial condition of the Company at the end of the period covered by the Form 10-K and results of operations of the Company for the periods covered in the financial statements in the Form 10-K.

Dated: February 28, 2019

/s/ Matthew J. Desch	/s/ Thomas J. Fitzpatrick
Matthew J. Desch	Thomas J. Fitzpatrick
Chief Executive Officer	Chief Financial Officer

This certification accompanies the Form 10-K and shall not be deemed “filed” by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.

XML

Cover: - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 22, 2019	Jun. 30, 2018
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Trading Symbol	IRDM
Entity Registrant Name	Iridium Communications Inc.
Entity Central Index Key	0001418819
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		112,239,417
Entity Public Float			$ 1,566,700,000

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 273,352	$ 285,873
Marketable securities	0	11,800
Accounts receivable, net	71,210	68,031
Inventory	27,538	20,068
Prepaid expenses and other current assets	18,284	25,347
Total current assets	390,384	411,072
Property and equipment, net	3,370,855	3,210,162
Restricted cash and cash equivalents	191,935	102,384
Other assets	12,557	8,414
Intangible assets, net	48,540	50,019
Total assets	4,014,271	3,782,051
Current liabilities:
Short-term credit facility	126,000	85,500
Accounts payable	12,869	43,100
Accrued expenses and other current liabilities	56,990	32,215
Interest payable	29,431	15,021
Deferred revenue	37,429	38,390
Total current liabilities	262,719	214,226
Long-term credit facility, net	1,478,739	1,618,055
Long-term senior unsecured notes, net	350,998	0
Deferred income tax liabilities, net	241,422	246,170
Deferred revenue, net of current portion	74,656	47,612
Other long-term liabilities	4,160	59,519
Total liabilities	2,412,694	2,185,582
Commitments and contingencies
Stockholders' equity:
Common stock, $0.001 par value, 300,000 shares authorized, 112,200 and 98,203 shares issued and outstanding	112	98
Additional paid-in capital	1,108,550	1,081,373
Retained earnings	501,712	518,794
Accumulated other comprehensive loss, net of tax	(8,797)	(3,796)
Total stockholders' equity	1,601,577	1,596,469
Total liabilities and stockholders' equity	4,014,271	3,782,051
Series A Preferred Stock [Member]
Stockholders' equity:
Preferred stock	0	0
Series B Preferred Stock [Member]
Stockholders' equity:
Preferred stock	$ 0	$ 0

XML

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Preferred stock, par value (in dollars per share)	$ 0.0001
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	112,200,000	98,203,000
Common stock, shares outstanding	112,200,000	98,203,000
Series A Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	1,000,000	1,000,000
Preferred Stock, Shares Outstanding	0	1,000,000
Series B Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	500,000	500,000
Preferred stock, shares issued	500,000	500,000
Preferred Stock, Shares Outstanding	497,000	500,000

XML

Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Services	$ 406,757	$ 349,735	$ 334,822
Subscriber equipment	97,848	77,119	74,211
Engineering and support services	18,403	21,192	24,607
Total revenue	523,008	448,046	433,640
Operating expenses:
Cost of services (exclusive of depreciation and amortization)	86,016	80,396	64,958
Cost of subscriber equipment	56,857	44,445	44,286
Research and development	22,429	15,247	16,079
Selling, general and administrative	97,846	84,405	82,552
Depreciation and amortization	218,207	122,266	49,394
Total operating expenses	481,355	346,759	257,269
Gain on Boeing transaction	0	14,189	0
Operating income	41,653	115,476	176,371
Other income (expense):
Interest income (expense), net	(62,441)	4,328	2,934
Other income (expense), net	139	(232)	(1,140)
Total other income (expense)	(62,302)	4,096	1,794
Income tax benefit (expense)	7,265	114,284	(67,133)
Total income (loss) before income taxes	(20,649)	119,572	178,165
Net income (loss)	(13,384)	233,856	111,032
Net income (loss) attributable to common stockholders (numerator for basic net income per share)	$ (23,533)	$ 218,420	$ 95,596
Weighted average shares outstanding - basic	108,975	97,934	95,967
Weighted average shares outstanding - diluted	108,975	128,130	124,875
Net income (loss) attributable to common stockholders per share - basic	$ (0.22)	$ 2.23	$ 1.00
Net income (loss) attributable to common stockholders per share - diluted	$ (0.22)	$ 1.82	$ 0.89
Comprehensive income (loss):
Net income (loss)	$ (13,384)	$ 233,856	$ 111,032
Foreign currency translation adjustments, net of tax	(5,017)	1,664	3,487
Unrealized gain (loss) on marketable securities, net of tax	16	(14)	130
Comprehensive income (loss)	(18,385)	235,506	114,649
Series A Preferred Stock [Member]
Dividends, Preferred Stock [Abstract]
Preferred stock dividends declared and paid	1,750	1,750	7,000
Preferred stock dividends, undeclared	0	5,250	0
Series B Preferred Stock [Member]
Dividends, Preferred Stock [Abstract]
Preferred stock dividends declared and paid	2,109	2,109	8,436
Preferred stock dividends, undeclared	$ 6,290	$ 6,327	$ 0

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Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Series A Preferred Stock [Member]	Series B Preferred Stock [Member]	Series A Convertible Preferred Stock	Series A Convertible Preferred Stock Series A Preferred Stock [Member]	Series B Convertible Preferred Stock	Series B Convertible Preferred Stock Series B Preferred Stock [Member]	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Retained Earnings Series A Preferred Stock [Member]	Retained Earnings Series B Preferred Stock [Member]
Balance at Dec. 31, 2015	$ 1,228,721							$ 95	$ 1,044,488	$ (9,063)	$ 193,201
Balance (in shares) at Dec. 31, 2015				1,000		500		95,126
Stock-based compensation	15,973								15,973
Stock options exercised and awards vested	549							$ 1	548
Stock options exercised and awards vested (in shares)								753
Stock withheld to cover employee taxes	(627)								(627)
Excess tax benefit from exercise of stock-based compensation	(71)								(71)
Net income (loss)	111,032										111,032
Dividends on preferred stock		$ (7,000)	$ (8,436)									$ (7,000)	$ (8,436)
Cumulative translation adjustments, net of tax	3,487									3,487
Unrealized loss on marketable securities, net of tax	130									130
Balance at Dec. 31, 2016	1,343,758							$ 96	1,060,311	(5,446)	288,797
Balance (in shares) at Dec. 31, 2016				1,000		500		95,879
Stock-based compensation	18,694								18,694
Stock options exercised and awards vested	4,235							$ 2	4,233
Stock options exercised and awards vested (in shares)								2,537
Stock withheld to cover employee taxes	(1,865)								(1,865)
Net income (loss)	233,856										233,856
Dividends on preferred stock		(1,750)	(2,109)									(1,750)	(2,109)
Cumulative translation adjustments, net of tax	1,664									1,664
Unrealized loss on marketable securities, net of tax	(14)									(14)
Stock withheld to cover employee taxes (in shares)								213
Balance at Dec. 31, 2017	1,596,469							$ 98	1,081,373	(3,796)	518,794
Balance (in shares) at Dec. 31, 2017				1,000		500		98,203
Stock-based compensation	16,727								16,727
Stock options exercised and awards vested	12,445							$ 4	12,441
Stock options exercised and awards vested (in shares)								3,443
Stock withheld to cover employee taxes	(1,981)							$ (1)	(1,980)
Net income (loss)	(13,384)										(13,384)
Dividends on preferred stock		$ (7,000)	$ (8,427)									$ (7,000)	$ (8,427)
Cumulative translation adjustments, net of tax	(5,017)									(5,017)
Unrealized loss on marketable securities, net of tax	16									16
Stock withheld to cover employee taxes (in shares)								(148)
Preferred stock converted to common					(1,000)		(3)
Stock Issued During Period, Shares, Conversion of Convertible Securities								10,702
Stock Issued During Period, Value, Conversion of Convertible Securities								$ 11	(11)
Changes from adoption of ASC 606, net of tax	11,729										11,729
Balance at Dec. 31, 2018	$ 1,601,577							$ 112	$ 1,108,550	$ (8,797)	$ 501,712
Balance (in shares) at Dec. 31, 2018				0		497		112,200

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ (13,384)	$ 233,856	$ 111,032
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Deferred income taxes	(8,334)	(115,812)	63,808
Depreciation and amortization	218,207	122,266	49,394
Loss on extinguishment of debt and Thales Alenia Space bills of exchange	7,292	0	0
Impairment of goodwill
Stock-based compensation (net of amounts capitalized)	14,490	15,958	13,708
Gain from contract liability write-off	0	(14,189)	0
Provision for doubtful accounts	198	(277)	703
Provision for obsolete inventory	343	361	1,053
Amortization of premiums on marketable securities	(709)	124	888
Amortization of Debt Issuance Costs	10,145	0	0
Non-cash foreign currency losses (gains), net	342	(163)	166
Changes in operating assets and liabilities:
Accounts receivable	(12,783)	(10,343)	(6,037)
Inventory	(7,579)	(1,946)	9,029
Prepaid expenses and other current assets	5,705	2,875	(16,613)
Other assets	(1,417)	2,823	(2,128)
Accounts payable	(732)	896	3,209
Accrued expenses and other current liabilities	37,797	8,166	(6,416)
Deferred revenue	13,530	15,129	4,115
Accrued satellite and network operation expense, net of current portion	0	0	(1,045)
Other long-term liabilities	598	(103)	333
Net cash provided by operating activities	263,709	259,621	225,199
Cash flows from investing activities:
Capital expenditures	(391,390)	(400,107)	(405,687)
Purchases of marketable securities	(235,528)	(7,013)	(19,865)
Sales and maturities of marketable securities	248,006	34,440	183,192
Net cash used in investing activities	(378,912)	(372,680)	(242,360)
Cash flows from financing activities:
Borrowings under the Credit Facility	0	22,207	251,498
Repayments on the Credit Facility, including extinguishments	(80,359)	0	0
Proceeds from Issuance of Unsecured Debt	360,000	0	0
Repayment of the Thales Alenia Space bills of exchange	(59,936)	0	0
Payment of deferred financing fees	(21,239)	(3,852)	(11,806)
Proceeds from exercise of stock options	12,445	4,235	549
Tax payment upon settlement of stock awards	(1,981)	(1,865)	(627)
Net cash provided by financing activities	193,503	16,866	224,178
Effect of exchange rate changes on cash and cash equivalents	(1,270)	144	512
Net increase (decrease) in cash and cash equivalents and restricted cash	77,030	(96,049)	207,529
Cash, cash equivalents, and restricted cash, beginning of period	388,257	484,306	276,777
Cash, cash equivalents, and restricted cash, end of period	465,287	388,257	484,306
Supplemental cash flow information:
Interest paid	101,816	85,261	22,910
Income taxes paid, net	931	1,660	1,391
Supplemental disclosure of non-cash investing and financing activities:
Property and equipment received but not paid for yet	11,900	90,748	2,753
Interest capitalized but not paid	9,194	15,021	14,136
Capitalized amortization of deferred financing fees	16,306	27,304	28,688
Capitalized paid-in-kind interest	0	0	52,873
Capitalized stock-based compensation	2,237	2,736	2,265
Credit facility repayment in exchange for settlement of hosting	35,000	0	0
Cost basis investment in exchange for the settlement of accounts receivable	3,300	0	0
Series A Preferred Stock [Member]
Cash flows from financing activities:
Payment of preferred stock dividends	(7,000)	(1,750)	(7,000)
Series B Preferred Stock [Member]
Cash flows from financing activities:
Payment of preferred stock dividends	$ (8,427)	$ (2,109)	$ (8,436)

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Organization and Business

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Business

Organization and Business

Iridium Communications Inc. (the “Company”), a Delaware corporation, offers voice and data communications services and products to businesses, U.S. and international government agencies and other customers on a global basis. The Company is a provider of mobile voice and data communications services via a constellation of low earth orbiting satellites. The Company holds various licenses and authorizations from the U.S. Federal Communications Commission (the “FCC”) and from foreign regulatory bodies that permit the Company to conduct its business, including the operation of its satellite constellation.

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Significant Accounting Policies and Basis of Presentation

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Significant Accounting Policies and Basis of Presentation

Significant Accounting Policies and Basis of Presentation

Principles of Consolidation and Basis of Presentation

The Company has prepared the consolidated financial statements in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”). The accompanying consolidated financial statements include the accounts of (i) the Company, (ii) its wholly owned subsidiaries, and (iii) all less than wholly owned subsidiaries that the Company controls. All material intercompany transactions and balances have been eliminated.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ materially from those estimates.

Adopted Accounting Pronouncements

Effective January 1, 2018, the Company adopted Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”), that supersedes nearly all existing revenue recognition guidance under U.S. GAAP. See Note 11 for more detail on the Company's adoption of ASU 2014-09.

Recent Accounting Developments Not Yet Adopted

In February 2016, the FASB issued ASU No. 2016-02, Leases (“ASU 2016-02”). ASU 2016-02 requires lessees to record most leases on their balance sheets but recognize expenses on their income statements in a manner similar to current accounting. The Company is applying the new guidance as of the effective date of January 1, 2019. Reporting organizations are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. The Company established a project team in order to analyze the effect of the standard on its leases by reviewing its current accounting policies to identify potential differences which would result from applying the requirements of the new standard to its leases. The Company will utilize the practical expedient to address all current operating leases for which it is the lessor and the lessee. On January 1, 2019, a lease liability and related right-of-use asset was recognized for operating lease arrangements where the Company is the lessee. Adoption of ASU 2016-02 will have an estimated impact of approximately$30.4 million on the Company's assets and liabilities for the addition of right-of-use assets and lease liabilities, but will not have a material impact on the Company's results of operations or liquidity.

Fair Value Measurements

The Company evaluates assets and liabilities subject to fair value measurements on a recurring and non-recurring basis to determine the appropriate level to classify them for each reporting period. This determination requires significant judgments to be made by management of the Company. The instruments identified as subject to fair value measurements on a recurring basis are cash and cash equivalents, marketable securities, prepaid expenses and other current assets, accounts receivable, accounts payable and accrued expenses and other current liabilities. Fair value is the price that would be received from the sale of an asset or paid to transfer a liability assuming an orderly transaction in the most advantageous market at the measurement date. U.S. GAAP establishes a hierarchical disclosure framework which prioritizes and ranks the level of observability of inputs used in measuring fair value. The fair value hierarchy consists of the following tiers:

• Level 1, defined as observable inputs such as quoted prices in active markets for identical assets or liabilities;

• Level 2, defined as observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and

• Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

The carrying values of short-term financial instruments (primarily cash and cash equivalents, prepaid expenses and other current assets, accounts receivable, accounts payable, and accrued expenses and other current liabilities) approximate their fair values because of their short-term nature. The fair value of the Company’s investments in money market funds approximates its carrying value; such instruments are classified as Level 1 and are included in cash and cash equivalents on the accompanying consolidated balance sheets.

The fair value of the Company’s investments in commercial paper and short-term U.S. agency securities with original maturities of less than ninety days approximates their carrying value; such instruments are classified as Level 2 and are included in cash and cash equivalents on the accompanying consolidated balance sheets. The fair value of the Company’s investments in fixed-income debt securities and commercial paper with original maturities of greater than ninety days are obtained using similar investments traded on active securities exchanges and are classified as Level 2. For fixed income securities that do not have quoted prices in active markets, the Company uses third-party vendors to price its debt securities resulting in classification as Level 2. All fixed-income securities are included in marketable securities on the accompanying consolidated balance sheets.

Concentrations of Credit Risk

Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents, marketable securities, and receivables. The majority of cash is invested into a money market fund with U.S. treasuries, Agency Mortgage Backed Securities and/or U.S. Government guaranteed debt. While the Company maintains its cash and cash equivalents with financial institutions with high credit ratings, it often maintains those deposits in federally insured financial institutions in excess of federally insured limits. When the Company holds marketable securities, they are highly-rated corporate and foreign fixed-income debt securities and commercial paper with an original maturity in excess of ninety days. The Company performs credit evaluations of its customers’ financial condition and records reserves to provide for estimated credit losses. Accounts receivable are due from both domestic and international customers.

Cash, Cash Equivalents and Restricted Cash

The Company considers all highly liquid investments with original maturities of ninety days or less to be cash equivalents. These investments, along with cash deposited in institutional money market funds, regular interest bearing depository accounts and non-interest bearing depository accounts, are classified as cash and cash equivalents on the accompanying consolidated balance sheets. The Company is required to maintain a minimum cash reserve for debt service related to its credit facility with Bpifrance Assurance Export S.A.S. ("BPIAE") (as amended to date, the "Credit Facility").

Marketable Securities

Marketable securities consist of fixed-income debt securities and commercial paper with an original maturity in excess of ninety days. These investments are classified as available-for-sale and are included in marketable securities within current assets on the accompanying consolidated balance sheets. All investments are carried at fair value. Unrealized gains and losses, net of taxes, are reported as a component of other comprehensive income or loss. The specific identification method is used to determine the cost basis of the marketable securities sold. There were no material realized gains or losses on the sale of marketable securities for the years ended December 31, 2018 and 2017. The Company regularly monitors and evaluates the fair value of its investments to identify other-than-temporary declines in value, and the Company determined that there were no such declines in fair value of investments as of December 31, 2017. The Company did not hold any marketable securities as of December 31, 2018 and therefore a review of amortized cost basis for other-than-temporary impairment was not required.

Accounts Receivable

Trade accounts receivable are recorded at the invoiced amount and are subject to late fee penalties. Management develops its estimate of an allowance for uncollectible receivables based on the Company’s experience with specific customers, aging of outstanding invoices, its understanding of customers’ current economic circumstances and its own judgment as to the likelihood that the Company will ultimately receive payment. The Company writes off its accounts receivable when balances ultimately are deemed uncollectible. The allowance for doubtful accounts was not material as of December 31, 2018 and 2017.

Foreign Currencies

The functional currency of the Company’s foreign consolidated subsidiaries is the local currency. Assets and liabilities of its foreign subsidiaries are translated to U.S. dollars based on exchange rates at the end of the reporting period. Income and expense items are translated at the weighted-average exchange rates prevailing during the reporting period. Translation adjustments are accumulated in a separate component of stockholders’ equity. Transaction gains or losses are classified as other income (expense), net in the accompanying consolidated statements of operations and comprehensive income (loss). In instances where the financial statements of a foreign entity in a highly inflationary economy are material, they are remeasured as if the functional currency were the reporting currency. In these instances, the financial statements of those entities are remeasured into the reporting currency. A highly inflationary economy is one that has cumulative inflation of approximately 100% or more over a three-year period.

Deferred Financing Costs

Direct and incremental costs incurred in connection with securing debt financing are deferred and are amortized as additional interest expense using the effective interest method over the term of the related debt. As of December 31, 2018 and 2017, the Company had deferred approximately$80.1 million and$97.2 million, respectively, of direct and incremental financing costs, net of amortization, associated with securing debt financing under the Credit Facility for the Company's next-generation constellation ("Iridium NEXT"). As of December 31, 2018 and 2017, the balance of deferred financing costs for borrowings under the Company's senior unsecured notes (the "Notes") was$9.0 million and zero, respectively.

Capitalized Interest

Interest costs associated with financing the Company’s assets during the construction period of Iridium NEXT have been capitalized. Total capitalized interest costs, under the Credit Facility and the Notes, for the years ended December 31, 2018, 2017 and 2016 were$76.7 million,$114.4 million and$106.4 million, respectively, which include amortization of deferred financing costs and accrued interest, as discussed above.

Inventory

Inventory consists primarily of finished goods, although the Company at times also maintains an inventory of raw materials from third-party manufacturers. The Company outsources manufacturing of subscriber equipment to a third-party manufacturer and purchases accessories from third-party suppliers. The Company’s cost of inventory includes an allocation of overhead, including payroll and payroll-related costs of employees directly involved in bringing inventory to its existing condition, and freight. Inventories are valued using the average cost method and are carried at the lower of cost or net realizable value. Accordingly, the Company recorded expense of$0.3 million,$0.4 million and$1.1 million for the years ended December 31, 2018, 2017 and 2016, respectively, which are included within the cost of subscriber equipment for excess and obsolete inventory. The expenses for the years ended December 31, 2018, 2017 and 2016 were primarily related to certain handset parts and accessories.

The Company has a manufacturing agreement with Benchmark Electronics Inc. (“Benchmark”) to manufacture most of its subscriber equipment. Pursuant to the agreement, the Company may be required to purchase excess materials at cost plus a contractual markup if the materials are not used in production within the periods specified in the agreement. Benchmark will then repurchase such materials from the Company at the same price paid by the Company, as required for the production of the subscriber equipment.

Stock-Based Compensation

The Company accounts for stock-based compensation at fair value. The fair value of stock options is determined at the grant date using the Black-Scholes option pricing model. The fair value of restricted stock units (“RSUs”) is equal to the closing price of the underlying common stock on the grant date. The fair value of an award that is ultimately expected to vest is recognized on a straight-line basis over the requisite service or performance period and is classified in the consolidated statements of operations and comprehensive income in a manner consistent with the classification of the recipient’s compensation. The expected vesting of the Company’s performance-based RSUs is based upon the probability that the Company achieves the defined performance goals. The level of achievement of performance goals, if any, is determined by the compensation committee. Stock-based awards to non-employee consultants are expensed at their fair value as services are provided according to the terms of their agreements and are classified in selling, general and administrative expenses in the accompanying consolidated statements of operations and comprehensive income. Classification of stock-based compensation by line item on the balance sheet and statement of operations is presented below:

	Year Ended December 31,
	2018		2017
	(In thousands)
Property and equipment, net	$	1,865	$	2,326
Inventory	234		280
Prepaid and other current assets	138		132
Cost of subscriber equipment	26		30
Cost of services (exclusive of depreciation and amortization)	3,600		4,366
Research and development	340		349
Selling, general and administrative	10,524		11,211
Total stock-based compensation	$	16,727	$	18,694

Property and Equipment

Property and equipment is carried at cost less accumulated depreciation. Depreciation is calculated using the straight-line method over the following estimated useful lives:

First-generation satellites	15-21 years
Next-generation satellites	12.5 years
Ground system	5-7 years
Equipment	3-5 years
Internally developed software and purchased software	3-7 years
Building	39 years
Building improvements	5-39 years
Leasehold improvements	shorter of useful life or remaining lease term

The estimated useful lives of the Company’s first-generation satellites reflected the expected use for each satellite. Satellites were depreciated on a straight-line basis through the date they were replaced by next-generation satellites. The Company completed its launches of the next-generation satellites in early 2019. Iridium NEXT satellites will be depreciated on a straight-line basis over their estimated useful life, which is currently12.5 years.

The Company calculates depreciation expense using the straight-line method and evaluates the appropriateness of the useful life used in this calculation on a quarterly basis or as events occur that require additional assessment. 

Repairs and maintenance costs are expensed as incurred.

Long-Lived Assets

The Company assesses its long-lived assets for impairment when indicators of impairment exist. Recoverability of assets is measured by comparing the carrying amounts of the assets to the future undiscounted cash flows expected to be generated by the assets. Any impairment loss would be measured as the excess of the assets’ carrying amount over their fair value.

In June 2011, the Company entered into an agreement with International Space Company Kosmotras ("Kosmotras"), as a supplemental launch services provider for Iridium NEXT. The original cost under the Kosmotras agreement was$51.8 million. Kosmotras to date has been unable to obtain the permits or authorizations to launch the Company's satellites on a Dnepr rocket as planned, and Kosmotras has proposed no satisfactory alternative launch plan. As the Company believed the construction-in-progress associated with the Kosmotras launch services will no longer be used or further developed, the Company wrote-off the full amount previously paid to Kosmotras, by recording accelerated depreciation expense of$36.8 million, in the fourth quarter of 2017. There were no similar write-offs during the years ended December 31, 2018 and 2016.

Intangible Assets

The Company’s intangible assets with finite lives are amortized over their useful lives and reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. If any indicators were present, the Company would test for recoverability by comparing the carrying amount of the asset to the net undiscounted cash flows expected to be generated from the asset. If those net undiscounted cash flows do not exceed the carrying amount (i.e., the asset is not recoverable), the Company would perform the next step, which is to determine the fair value of the asset and record an impairment loss, if any. The Company evaluates the useful lives for these intangible assets each reporting period to determine whether events and circumstances warrant a revision in their remaining useful lives.

Amortization is calculated using the straight-line method over the following estimated useful lives:

Intellectual property	20 years
Assembled workforce	7 years
Patents	14 - 20 years

Revenue Recognition

The Company derives its revenue primarily as a wholesaler of satellite communications products and services. The primary types of revenue include (i) service revenue (access and usage-based airtime fees), (ii) subscriber equipment revenue, and (iii) revenue generated by providing engineering and support services to commercial and government customers. In addition to the discussion immediately below, see Note 11 for further discussion of the Company's revenue recognition.

Wholesaler of satellite communications products and services

Pursuant to wholesale agreements, the Company sells its products and services to service providers who, in turn, sell the products and services to other distributors or directly to the end users. The Company recognizes revenue when an arrangement exists, services or equipment are transferred, the transaction price is determined, the arrangement has commercial substance, and collection of consideration is probable.

Contracts with multiple performance obligations

At times, the Company sells services and equipment through arrangements that bundle equipment, airtime and other services. For these revenue arrangements when the Company sells services and equipment in bundled arrangements and determines that it has separate distinct performance obligations, the Company allocates the bundled contract price among the various performance obligations based on each deliverable’s stand-alone selling price. If the stand-alone selling price is not directly observable, the Company estimates the amount to be allocated for each performance obligation based on observable market transactions or the residual approach. When the Company determines the performance obligations are not distinct, the Company recognizes revenue on a combined basis as the last obligation is satisfied. To the extent the Company's contracts include variable consideration, the transaction price includes both fixed and variable consideration. The variable consideration contained within the Company's contracts with customers may include discounts, credits and other similar items. When a contract includes variable consideration, the Company evaluates the estimate of the variable consideration to determine whether the estimate needs to be constrained; therefore, the Company includes the variable consideration in the transaction price only to the extent that it is probable that a significant reversal of the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved. Variable consideration estimates are updated at the end of each quarter. 

Service revenue sold on a stand-alone basis

Service revenue is generated from the Company’s service providers through usage of its satellite system and through fixed monthly access fees per user charged to service providers. Revenue for usage is recognized when usage occurs. Revenue for fixed-per-user access fees is recognized over the usage period in which the services are provided to the end user. The Company sells prepaid services in the form of e-vouchers and prepaid cards. A liability is established equal to the cash paid upon purchase for the e-voucher or prepaid card. On January 1, 2018, upon the adoption of ASU 2014-09, the Company now (i) recognizes revenue from the prepaid services upon the use of the e-voucher or prepaid card by the customer and (ii) estimates the expected revenue that will expire unused on an ongoing basis and recognizes this revenue in a manner consistent with the usage period. Prior to January 1, 2018, revenue from unused prepaid services was recognized upon expiration of the prepaid card. The Company does not offer refunds for unused prepaid services.

Services sold to the U.S. government

The Company provides airtime and airtime support to U.S. government and other authorized customers pursuant to the Enhanced Mobile Satellite Services (“EMSS”) contract managed by Air Force Space Command. Under the terms of this agreement, authorized customers continue to utilize airtime services, provided through the U.S. Department of Defense’s (“DoD”) dedicated gateway. These services include unlimited global secure and unsecure voice, low and high-speed data, paging, broadcast and Distributed Tactical Communications Services (“DTCS”) services for an unlimited number of DoD and other federal subscribers. The EMSS contract was extended for an additional six months at the annual rate of$88 million per year for the remaining term and now expires in April 2019. Under this contract, revenue is based on the annual fee for the fixed-price contract with unlimited subscribers, and is recognized on a straight-line basis over each contractual year. The U.S. government purchases its subscriber equipment from third-party distributors and not directly from the Company.

Subscriber equipment sold on a stand-alone basis

The Company recognizes subscriber equipment sales and the related costs when title to the equipment (and the risks and rewards of ownership) passes to the customer, typically upon shipment. Customers do not have rights of return without prior consent from the Company.

Government engineering and support services

The Company provides maintenance services to the U.S. government’s dedicated gateway. This revenue is recognized ratably over the periods in which the services are provided; the related costs are expensed as incurred.

Other government and commercial engineering and support services

The Company also provides engineering services to assist customers in developing new technologies for use on the Company’s satellite system. The revenue associated with fixed-fee contracts is recognized over time using costs incurred to date relative to total estimated costs at completion to measure progress toward satisfying its performance obligation. The Company does not include purchases of goods from a third party in its evaluation of costs incurred. Incurred costs represent work performed, which corresponds with, and thereby best depicts, the transfer of control to the customer. Revenue on cost-plus-fixed-fee contracts is recognized to the extent of estimated costs incurred plus the applicable fees earned. The Company considers fixed fees under cost-plus-fixed-fee contracts to be earned in proportion to the allowable costs incurred in performance of the contract.

Research and Development

Research and development costs are charged to expense in the period in which they are incurred.

Advertising Costs

Costs associated with advertising and promotions are expensed as incurred. Advertising expenses were$0.4 million,$0.3 million and$0.5 million for the years ended December 31, 2018, 2017 and 2016, respectively.

Income Taxes

The Company accounts for income taxes using the asset and liability approach, which requires the recognition of tax benefits or expenses for temporary differences between the financial reporting and tax bases of assets and liabilities. A valuation allowance is established when necessary to reduce deferred tax assets to the amounts expected to be realized. The Company also recognizes a tax benefit from uncertain tax positions only if it is “more likely than not” that the position is sustainable based on its technical merits. The Company’s policy is to recognize interest and penalties on uncertain tax positions as a component of income tax expense.

Net Income (Loss) Per Share

The Company calculates basic net income (loss) per share by dividing net income (loss) attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. Diluted net income (loss) per share takes into account the effect of potential dilutive common shares when the effect is dilutive. The effect of potential dilutive common shares, including common stock issuable upon exercise of outstanding stock options, is computed using the treasury stock method. The effect of potential dilutive common shares from the conversion of the outstanding convertible preferred securities is computed using the as-if converted method at the stated conversion rate. The Company’s unvested RSUs awarded to the board of directors contain non-forfeitable rights to dividends and therefore are considered to be participating securities in periods of net income. The calculation of basic and diluted net income (loss) per share excludes net income attributable to these unvested RSUs from the numerator and excludes the impact of these unvested RSUs from the denominator.

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Cash and Cash Equivalents and Marketable Securities

12 Months Ended

Dec. 31, 2018

Cash and Cash Equivalents [Abstract]

Cash and Cash Equivalents and Marketable Securities

3. Cash and Cash Equivalents, Restricted Cash and Investments

Cash and Cash Equivalents

The following table summarizes the Company’s cash and cash equivalents:

	December 31,				Recurring Fair Value Measurement
	2018		2017
	(In thousands)
Cash and cash equivalents:
Cash	$	20,879	$	24,092
Money market funds	252,473		251,950		Level 2
Commercial paper	—		9,831		Level 2
Total cash and cash equivalents	$	273,352	$	285,873

Restricted Cash and Cash Equivalents

The Company is required to maintain a minimum cash reserve within a debt service reserve account ("DSRA") for debt service related to its Credit Facility (see Note 7). As of December 31, 2018 and 2017, the Company’s restricted cash and cash equivalents balances, which include the minimum cash reserve for debt service and the interest earned on these amounts, were$191.9 million and$102.4 million, respectively.

Marketable Securities

As of December 31, 2018, the Company did not hold any investment positions in marketable securities. As of December 31, 2017, the Company held$11.8 million in marketable securities, consisting of fixed-income debt securities and U.S. treasuries. Marketable securities due to mature within one year had a fair value of$11.5 million, and marketable securities due to mature between one and three years had a fair value of$0.3 million. During the years ended December 31, 2018 and 2017, there were no material realized gains or losses.

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Property and Equipment

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and Equipment

Property and equipment consisted of the following:

	December 31,
	2018			2017
	(In thousands)
Satellite system	$	2,766,627		$	1,199,794
Ground system	60,656			67,576
Equipment	42,152			35,616
Internally developed software and purchased software	215,252			191,089
Building and leasehold improvements	30,517			32,130
Total depreciable property and equipment	3,115,204			1,526,205
Less: accumulated depreciation	(453,463		)	(432,833		)
Total depreciable property and equipment, net of accumulated depreciation	2,661,741			1,093,372
Land	8,037			8,037
Construction-in-process:
Iridium NEXT systems under construction	658,395			2,088,380
Other construction-in-process	42,682			20,373
Total property and equipment, net of accumulated depreciation	$	3,370,855		$	3,210,162

Other construction-in-process consisted of the following:

	December 31,
	2018		2017
	(In thousands)
Internally developed software	$	27,725	$	14,782
Equipment	12,841		4,241
Ground system	2,116		1,350
Total other construction-in-process	$	42,682	$	20,373

Depreciation expense was$216.6 million,$120.7 million and$48.6 million for the years ended December 31, 2018, 2017 and 2016, respectively. The increase in depreciation from 2017 to 2018 results primarily from the addition of Iridium NEXT satellites placed into service during 2018.

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Intangible Assets

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible Assets

The Company had identifiable intangible assets as follows:

	December 31, 2018
	Useful Life (years)	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
	(In thousands)
Indefinite life intangible assets:
Trade names	Indefinite	$	21,195	$	—		$	21,195
Spectrum and licenses	Indefinite	14,030		—			14,030
Total		35,225		—			35,225
Definite life intangible assets:
Intellectual property	20 years	16,439		(7,434		)	9,005
Assembled workforce	7 years	5,678		(1,622		)	4,056
Patents	14 - 20	274		(20		)	254
Total		22,391		(9,076		)	13,315
Total intangible assets		$	57,616	$	(9,076	)	$	48,540

	December 31, 2017
	Useful Life (years)	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
	(In thousands)
Indefinite life intangible assets:
Trade names	Indefinite	$	21,195	$	—		$	21,195
Spectrum and licenses	Indefinite	14,030		—			14,030
Total		35,225		—			35,225
Definite life intangible assets:
Intellectual property	20 years	16,439		(6,651		)	9,788
Assembled workforce	7 years	5,678		(812		)	4,866
Patents	14 - 20	146		(6		)	140
Total		22,263		(7,469		)	14,794
Total intangible assets		$	57,488	$	(7,469	)	$	50,019

Amortization expense was$1.6 million,$1.6 million and$0.8 million for the years ended December 31, 2018, 2017 and 2016, respectively. See Note 8 for further details on the Boeing assembled workforce, added in 2017.

Future amortization expense with respect to intangible assets existing at December 31, 2018, by year and in the aggregate, was as follows:

Year ending December 31,	Amount
	(In thousands)
2019	$	1,609
2020	1,609
2021	1,609
2022	1,609
2023	1,609
Thereafter	5,270
Total estimated future amortization expense	$	13,315

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Thales Alenia Space

In June 2010, the Company executed a primarily fixed-price full-scale development contract ("FSD") with Thales Alenia Space for the design and build of satellites for its Iridium NEXT satellites. The total price under the FSD is approximately$2.3 billion, and the Company expects payment obligations under the FSD to extend into thesecond quarter of 2019. As of December 31, 2018, the Company had made aggregate payments of$2.2 billion to Thales Alenia Space, which are capitalized as construction-in-progress within property and equipment, net, in the accompanying consolidated balance sheet, of which$1.5 billion were financed from borrowings under the Credit Facility.

On March 9, 2018, the Company and Thales Alenia Space entered into an amendment to the FSD, pursuant to which the Company and Thales Alenia Space unwound the prior changes that allowed for the deferral of certain milestone payments totaling$100.0 million through the issuance of bills of exchange. The March 2018 amendment to the FSD became effective on March 21, 2018, upon the Company's receipt of proceeds from a senior unsecured notes offering (see Note 7). The Company utilized a portion of the proceeds from the senior unsecured notes to prepay in full the$59.9 million of amounts due under outstanding bills of exchange, replenish the DSRA under the Credit Facility to $189.0 million, and to pay approximately$44.4 million in Thales Alenia Space milestones previously expected to be satisfied by the issuance of additional bills of exchange. In connection with the prepayment of the Thales Alenia Space bills of exchange, for the year ended December 31, 2018, the Company recorded a$4.0 million loss on extinguishment of debt, included within interest expense, representing premiums paid and the write-off of unamortized debt issuance costs. The Company had no loss on extinguishment of debt recorded for the year ended December 31, 2017.

SpaceX

In March 2010, the Company entered into an agreement with Space Exploration Technologies Corp. (“SpaceX”) to secure SpaceX as the primary launch services provider for Iridium NEXT (as amended to date, the “SpaceX Agreement”). The total price under the SpaceX Agreement for seven launches and a reflight option in the event of launch failure is$448.9 million. The SpaceX Falcon 9 rocket was configured to carry ten Iridium NEXT satellites to orbit for each of the initial seven launches. In November 2016, the Company entered into an agreement for an eighth launch with SpaceX to launch five additional satellites and to share the launch services with GFZ German Research Centre for Geosciences (“GFZ”). This launch took place in May 2018. The total price under the SpaceX Agreement for the eighth launch was$61.9 million. GFZ paid the Company$29.8 million to include the launch of NASA’s two Gravity Recovery and Climate Experiment Follow-On satellites. As of December 31, 2018, the Company had made aggregate payments of$498.9 million to SpaceX, which were capitalized as construction-in-progress within property and equipment, net in the accompanying consolidated balance sheets. The Company expects payments to SpaceX to continue into the first quarter of 2019.

Kosmotras

In June 2011, the Company entered into an agreement with Kosmotras as a supplemental launch services provider for Iridium NEXT. The original cost under the Kosmotras agreement was$51.8 million. Kosmotras to date has been unable to obtain the permits or authorizations to launch the Company's satellites on a Dnepr rocket as planned, and Kosmotras has proposed no satisfactory alternative launch plan. As a result, the Company wrote-off the full amount previously paid to Kosmotras, by recording accelerated depreciation expense of$36.8 million, in the fourth quarter of 2017. 

Iridium NEXT Launch and In-Orbit Insurance

The Company was required, pursuant to its Credit Facility, to obtain insurance covering the launch and first 12 months of operation of the Iridium NEXT satellites. The launch and in-orbit insurance the Company obtained contains elements, consistent with the terms of the Credit Facility, of self-insurance and deductibles, providing reimbursement only after a specified number of satellite failures. As a result, a failure of one or more of the Company’s satellites, or the occurrence of equipment failures and other related problems, could constitute an uninsured loss or require the payment of additional premiums and could harm the Company’s financial condition. Furthermore, launch and in-orbit insurance does not cover lost revenue. The total premium for the company's current launch and in-orbit insurance is$120.7 million, which waspaid in full as of December 31, 2018.

Due to various contractual requirements with Motorola, the prior operator of the Company's first-generation satellite constellation, the Company is required to maintain a third-party liability in-orbit insurance policy on its first-generation satellites with a de-orbiting endorsement to cover potential claims relating to operating or de-orbiting the satellite constellation or individual satellites.

The current policy has a renewable one-year term, which is scheduled to expire onDecember 8, 2019. The policy coverage is separated into Sections A, B, and C.

Section A coverage is currently in effect and covers product liability over Motorola’s position as manufacturer of the first-generation satellites. Liability limits for claims under Section A are$1.0 billion per occurrence and in the aggregate. There is no deductible for claims.

Section B coverage is currently in effect and covers risks in connection with in-orbit satellites and for the de-orbit of individual satellites. Liability limits for claims under Section B are$500 million per occurrence and in the aggregate for space vehicle liability and$500 million and$1.0 billion per occurrence and in the aggregate, respectively, with respect to de-orbiting. The balance of the unamortized premium payment for Sections A and B coverage as of December 31, 2018 is included in prepaid expenses and other current assets in the accompanying consolidated balance sheet. The deductible for claims under Section B is$250,000 per occurrence.

Section C coverage is effective once requested by the Company and covers risks in connection with a mass decommissioning of the first-generation satellites. Liability limits for claims under Section C are$500 million and$1.0 billion per occurrence and in the aggregate, respectively. As of December 31, 2018, the Company had not requested Section C coverage since no mass decommissioning activities are currently anticipated. The deductible for claims under Section C is$250,000 per occurrence.

Unconditional Purchase Obligations

The Company has a manufacturing agreement with Benchmark. Pursuant to the agreement, the Company may be required to purchase certain materials if the materials are not used in production within the periods specified in the agreement. Benchmark will then repurchase such materials from the Company at the same price paid by the Company, as required for the production of the devices. As of December 31, 2018 and 2017, the Company had$2.5 million and$4.0 million, respectively, of such materials, and the amounts were included in inventory on the accompanying consolidated balance sheets.

As of December 31, 2018, the aggregate unconditional purchase obligations were$39.1 million, which includes the Company’s commitments with Boeing and Benchmark as well as$7.2 million of open purchase orders executed with other vendors. The Boeing obligations (see Note 8) represent the take-or-pay commitment with the execution of the Development Services Agreement (“DSA”). The Company's obligation to Benchmark for the year ending December 31, 2019 is$13.9 million.

Operating Leases

The Company leases land, office space, and office and computer equipment under noncancelable operating lease agreements. The Company adopted ASC 842, the new lease accounting standard, effective January 1, 2019 (see Note 2). Most of the leases contain renewal options of 1 to 10 years. The Company’s obligations under the current terms of these leases extend through 2030.

Additionally, several of the Company’s leases contain clauses for rent escalation including, but not limited to, a pro-rata share of increased operating and real estate tax expenses. Rent expense is recognized on a straight-line basis over the lease term. Future minimum lease payments, by year and in the aggregate, under noncancelable operating leases at December 31, 2018, are as follows:

Year ending December 31,	Operating Leases
	(In thousands)
2019	$	3,692
2020	3,734
2021	3,827
2022	3,402
2023	3,359
Thereafter	12,926
Total	$	30,940

Rent expense for the years ended December 31, 2018, 2017 and 2016 was$3.3 million,$3.2 million and$3.1 million, respectively.

Contingencies

From time to time, in the normal course of business, the Company is party to various pending legal claims and lawsuits. The Company is not aware of any actions that it expects to have a material adverse impact on its business, financial results or financial condition.

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Debt

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Debt

Debt

Credit Facility

In October 2010, the Company entered into its$1.8 billion Credit Facility with a syndicate of bank lenders, which was amended and restated most recently on March 9, 2018. As of December 31, 2018, the Company reported an aggregate total of$1,684.9 million in borrowings, including$80.1 million of unamortized deferred financing costs, for a net balance of$1,604.8 million in borrowings from the Credit Facility in the accompanying consolidated balance sheet. Ninety-five percent of the Company's obligations under the Credit Facility are insured by BPIAE. Scheduled semi-annual principal repayments began on April 3, 2018, and are scheduled to be paid each March 30 and September 30.

As amended and restated, the Credit Facility (i) allowed the Company to issue$360.0 million in senior unsecured notes, (ii) delayed a portion of the principal repayments scheduled under the Credit Facility for 2018, 2019 and 2020 into 2023 and 2024 pursuant to an amended repayment installment schedule, (iii) allowed the Company to access up to$87.0 million from the DSRA in the future if its projected cash level falls below$75.0 million, and (iv) adjusted the Company’s financial covenants, including eliminating covenants that required the Company to receive cash flows from hosted payloads and adding a covenant that requires the Company to receive$200.0 million in hosting fees from Aireon LLC, the Company's primary hosted payload customer, by December 2023. In the event that (a) the Company's cash balance exceeds$140.0 million after September 30, 2019 (subject to specified exceptions) or (b) the Company receives hosting fees from Aireon, the Company would be required pursuant to the Credit Facility to use50% of such excess cash and up to$200.0 million of hosting fees to prepay the Credit Facility. In addition, if any of the Company's senior unsecured notes remain outstanding on October 15, 2022, which is six months prior to the scheduled maturity thereof, the maturity of all amounts remaining outstanding under the Credit Facility would be accelerated from September 30, 2024 to October 15, 2022. Lender fees incurred related to the amended and restated Credit Facility were$10.3 million, which were capitalized as deferred financing costs and are being amortized over the remaining term.

Pursuant to the amended and restated Credit Facility, the Company is required to use proceeds received from Aireon related to hosting fees to prepay the principal. As such, for the year ended December 31, 2018, the Company extinguished principal of$43.1 million, resulting in a$3.3 million loss on extinguishment of debt recorded within interest expense, representing premiums paid and the write-off of unamortized debt issuance costs. There were no prepayments or related interest expense during the year ended December 31, 2017.

During the repayment period, interest is paid on the same date as the principal repayments.

The effective interest rate on outstanding principal of the Credit Facility was 6.6% during each of the years ended December 31, 2018, 2017 and 2016.

Under the terms of the Credit Facility, as of December 31, 2018, the Company is required to maintain a minimum cash reserve within the DSRA of$189.0 million, which is classified as restricted cash and cash equivalents on the accompanying consolidated balance sheet. The Credit Facility is scheduled to mature in September 2024, subject to acceleration as described below.

As of December 31, 2018, the DSRA balance was$191.9 million, which is classified as restricted cash and cash equivalents in our condensed consolidated balance sheet. This amount includes a minimum cash reserve for debt service related to the Credit Facility as well as the interest earned on these amounts. In addition to the minimum debt service levels, financial covenants under the Credit Facility, as amended to date, include:

• an available cash balance of at least$25 million;

• a debt-to-equity ratio, which is calculated as the ratio of total net debt to the aggregate of total net debt and total stockholders’ equity, of no more than0.7 to 1, measured each June 30 and December 31;

• specified maximum levels of annual capital expenditures (excluding expenditures on the construction of Iridium NEXT satellites) through the year ending December 31, 2024;

• a debt service coverage ratio of not less than1.5 to 1, measured each June 30 and December 31 through the year ending December 31, 2020, not less than1.25 to 1 for June 30 and December 31, 2021, and not less than1.5 to 1, for each June 30 and December 31 thereafter through 2024;

• specified maximum leverage levels that decline from a ratio of8.24 to 1 for the year ended December 31, 2018 to a ratio of2.00 to 1 for the year ending December 31, 2024; and

• a requirement that we receive at least$200.0 million in hosting fees from Aireon by December 31, 2023.

The Company's available cash balance, as defined by the Credit Facility, was$273.4 million as of December 31, 2018. The Company's debt-to-equity ratio was0.53 to 1 as of December 31, 2018. The Company's debt service coverage ratio was3.4 to 1 as of December 31, 2018, and the Company's leverage was5.9 to 1 for the year ended December 31, 2018. The Company was alsoin compliance with the annual capital expenditures covenant as of December 31, 2018.

The covenant regarding capital expenditures is calculated in connection with a measurement, which the Company refers to as available cure amount, that is derived using a complex calculation based on overall cash flows, as adjusted by numerous measures specified in the Credit Facility. In a period in which the Company's capital expenditures exceed the amount specified in the respective covenant, the Company would be permitted to allocate available cure amount, if any, to prevent a breach of the applicable covenant. As of December 31, 2018, the Company had an available cure amount of$62.5 million, although it was not necessary to apply any available cure amount to maintain compliance with the covenants. The available cure amount has fluctuated significantly from one measurement period to the next, and the Company expects that it will continue to do so.

The covenants also place limitations on the Company's ability and that of its subsidiaries to carry out mergers and acquisitions, dispose of assets, grant security interests, declare, make or pay dividends, enter into transactions with affiliates, incur additional indebtedness, or make loans, guarantees or indemnities. If the Company is not in compliance with the financial covenants under the Credit Facility, after any opportunity to cure such non-compliance, or the Company otherwise experiences an event of default under the Credit Facility, the lenders may require repayment in full of all principal and interest outstanding under the Credit Facility. It is unlikely the Company would have adequate funds to repay such amounts prior to the scheduled maturity of the Credit Facility. If the Company fails to repay such amounts, the lenders may foreclose on the assets it has pledged under the Credit Facility, which include substantially all of the Company's assets and those of its domestic subsidiaries.

Senior Unsecured Notes

On March 21, 2018, the Company issued the Notes which bear interest at10.25% per annum and mature on April 15, 2023. Interest is payable semi-annually on April 15 and October 15 and principal is repaid in full upon maturity. Interest payments began on October 15, 2018. The proceeds of the Notes were used to prepay the outstanding Thales Alenia Space bills of exchange, including premiums paid, of approximately$59.9 million issued pursuant to the FSD, replenish the DSRA under the Credit Facility to$189.0 million, and to pay approximately$44.4 million in Thales Alenia Space milestones previously expected to be satisfied by the issuance of bills of exchange. The proceeds of the Notes also provided the Company with additional cash to meet its needs, including principal and interest payments under the Credit Facility and interest payments on the Notes. As of December 31, 2018, the Company reported an aggregate of$360.0 million in borrowings under the Notes, before$9.0 million of unamortized deferred financing costs, for a net principal balance of$351.0 million in borrowings in the accompanying consolidated balance sheet. As of December 31, 2018, based upon recent trading prices (Level 2 - market approach), the fair value of the Company's$360.0 million in borrowings under the Notes due in 2022 was$389.7 million. The Notes contain covenant requirements that apply to certain permitted financing actions, but the covenants under the Notes are no more restrictive than the covenants included in the Credit Facility. The Company was in compliance with all covenant requirements under the Notes as of December 31, 2018.

Total Debt

Total interest incurred during the years ended December 31, 2018, 2017 and 2016 was$142.7 million,$114.4 million and$106.4 million, respectively. Interest incurred includes amortization of deferred financing fees of$26.5 million,$27.3 million and$28.7 million for the years ended December 31, 2018, 2017 and 2016, respectively. Interest capitalized during the year ended December 31, 2018 was$76.7 million. During 2017 and 2016, all interest was capitalized. Also during 2016, paid-in-kind interest was$44.4 million with the remainder payable in cash on the scheduled semi-annual payment dates. Interest accrued for the years ended December 31, 2018 and 2017 was$29.4 million and$15.0 million, respectively.

Future minimum principal repayments with respect to the Company's debt balances existing at December 31, 2018 by year and in the aggregate, are as follows:

Year ending December 31,	Amount
	(In thousands)
2019	$	126,000
2020	216,000
2021	306,000
2022	666,000
2023	360,000
Thereafter	370,869
Total debt commitments	$	2,044,869
Less: Original issuance discount	89,132
Less: Total short-term debt	126,000
Total long-term debt, net	$	1,829,737

The repayment schedule above excludes the redemption of Iridium's equity interest in Aireon, Aireon dividends (when and if declared) and any hosting fees received from Aireon. The Company must apply100% of these Aireon receipts toward the prepayment of the Credit Facility, which may result in an earlier repayment. As stated above, if any of the Notes remain outstanding on October 15, 2022, which is six months prior to the scheduled maturity thereof, the maturity of all amounts remaining outstanding under the Credit Facility would be accelerated from September 30, 2024 to October 15, 2022. As such, the Company assumes full principal repayment of the Notes in 2022, prior to October 15, 2022.

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Boeing Operations and Maintenance (O&M) Agreements

12 Months Ended

Dec. 31, 2018

Boeing Operations And Maintenance Agreements [Abstract]

Boeing Operations and Maintenance (O&M) Agreements

Boeing Insourcing Agreement

On January 3, 2017, the Company hired the majority of the employees and third-party contractors who were responsible for the operations and maintenance of the Company’s satellite constellation and ground infrastructure pursuant to an Insourcing Agreement with The Boeing Company ("Boeing"). The Company paid Boeing$5.5 million, of which$2.75 million was paid in each of December 2016 and December 2017. As a result, the Company and Boeing terminated their previous Operations and Maintenance Agreement (“O&M Agreement”) and Iridium NEXT Support Service Agreement and entered into a new DSA with a$6.0 million minimum annual commitment through 2021. Boeing no longer has a unilateral right to commence the de-orbit of the Company’s first-generation satellites. The acquisition of this assembled workforce was recorded as a definite-lived intangible asset in January 2017 and is being amortized over an estimated useful life of seven years. Additionally, by terminating the O&M Agreement, the Company recognized a$14.2 million gain in the first quarter of 2017, consisting of (i) the derecognition of a purchase accounting liability created when GHL Acquisition Corp. acquired Iridium Holdings LLC in 2009 related to the fair value of the contractual arrangement with Boeing as of that date, and (ii) the remainder of a credit resulting from a July 2010 Boeing contract amendment.

The Company incurred expenses of$28.1 million,$30.5 million and$29.0 million relating to satellite operations and maintenance costs for the years ended December 31, 2018, 2017 and 2016, respectively, which include internal costs and amounts paid to Boeing, and are included in cost of services (exclusive of depreciation and amortization) in the consolidated statements of operations and comprehensive income.

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Stock-Based Compensation

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

Stock-Based Compensation

In May 2017, the Company’s stockholders approved the amendment and restatement of the Company's 2015 Equity Incentive Plan (as so amended and restated, the “Amended 2015 Plan”), primarily to increase the number of shares available under the plan. The Company registered with the SEC an additional5,199,239 shares of common stock made available for issuance pursuant to the Amended 2015 Plan, bringing the total to28,402,248 shares registered. Through December 31, 2018, the remaining aggregate number of shares of the Company's common stock available for future grants under the Amended 2015 plan was8,569,642. The Amended 2015 Plan provides for the grant of stock-based awards, including nonqualified stock options, incentive stock options, restricted stock, RSUs, stock appreciation rights and other equity securities as incentives and rewards for employees, consultants and non-employee directors of the Company and its affiliated entities. The number of shares of common stock available for issuance under the Amended 2015 Plan is reduced by (i) one share for each share of common stock issued pursuant to an appreciation award, such as a stock option or stock appreciation right with an exercise or strike price of at least100% of the fair market value of the underlying common stock on the date of grant, and (ii)1.8 shares for each share of common stock issued pursuant to any stock award that is not an appreciation award, also known as a “full value award.” The Amended 2015 Plan allows the Company to utilize a broad array of equity incentives and performance cash incentives in order to secure and retain the services of its employees, directors and consultants, and to provide long-term incentives that align the interests of its employees, directors and consultants with the interests of the Company’s stockholders. The Company accounts for stock-based compensation at fair value.

Stock Option Awards

The fair value of stock options is determined at the grant date using the Black-Scholes option pricing model. The stock option awards granted to employees generally (i) have a term of ten years, (ii) vest over a four-year period with 25% vesting after the first year of service and the remainder vesting ratably on a quarterly basis thereafter, (iii) are contingent upon employment on the vesting date, and (iv) have an exercise price equal to the fair value of the underlying shares at the date of grant.

Fair Value Determination

We have used the Black-Scholes-Merton option pricing model to determine fair value of our stock option awards on the date of grant. We will reconsider the use of the Black-Scholes-Merton model if additional information becomes available in the future that indicates another model would be more appropriate or if grants issued in future periods have characteristics that cannot be reasonably estimated under this model.

The following weighted-average assumptions were used for option grants during the years ended December 31, 2018, 2017 and 2016:

• Volatility - The expected volatility of the options granted was estimated based upon historical volatility of the Company's share price of its common stock through daily observations of its trading history.

• Expected life of options - The expected life of options granted to employees was determined from the simplified method.

• Risk-free interest rate - The yield on zero-coupon U.S. Treasury strips was used to extrapolate a forward-yield curve. This “term structure” of future interest rates was then input into a numeric model to provide the equivalent risk-free rate to be used in the Black-Scholes-Merton model based on the expected term of the underlying grants.

• Dividend yield - The Black-Scholes-Merton valuation model requires an expected dividend yield as an input. The Company does not anticipate paying dividends during the expected term of the grants; therefore, the dividend rate is assumed to be zero.

The Company now grants stock options to newly hired and promoted employees only. During 2018, 2017 and 2016, the Company granted approximately364,000,209,000 and249,000 stock options, respectively, with an estimated aggregate grant date fair value of$2.4 million,$0.9 million and$0.9 million, respectively.

The following table summarizes weighted-average assumptions used in the Company's calculations of fair value:

	Year Ended December 31,
	2018	2017	2016
Expected volatility	39.53%	41.11%	41.36%
Expected term (years)	6.11	6.25	6.25
Expected dividends	—%	—%	—%
Risk free interest rate	2.68%	1.92%	1.68%

A summary of the activity of the Company’s stock options is as follows:

	Shares		Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
	(In thousands, except years and per share data)
Options outstanding at December 31, 2015	7,120		$	7.86
Granted	249		8.13
Cancelled or expired	(39	)	8.92
Exercised	(73	)	7.33
Forfeited	(55	)	7.62
Options outstanding at December 31, 2016	7,202		$	7.87	5.45	$	12,473
Granted	209		10.50
Cancelled or expired	(2	)	7.24
Exercised	(534	)	7.93
Forfeited	(19	)	9.13
Options outstanding at December 31, 2017	6,856		$	7.94	4.63	$	26,459
Granted	364		15.56
Cancelled or expired	(1	)	8.59
Exercised	(1,477	)	8.42
Forfeited	(39	)	9.97
Options outstanding at December 31, 2018	5,703		$	8.29	4.38	$	57,956
Options exercisable at December 31, 2018	5,095		$	7.72	3.87	$	54,694
Options exercisable and expected to vest at December 31, 2018	5,687		$	8.27	4.37	$	57,891

The Company recognized$1.5 million,$1.8 million and$2.5 million of stock-based compensation expense related to stock options in the years ended December 31, 2018, 2017 and 2016, respectively.

The weighted-average grant date fair value of options granted during the years ended December 31, 2018, 2017 and 2016 was$6.63,$4.51 and$3.47 per share, respectively. The total fair value of the shares vested during the years ended December 31, 2018, 2017 and 2016 was$1.4 million,$2.0 million and$2.9 million, respectively.

As of December 31, 2018, the total unrecognized cost related to non-vested options was approximately$2.9 million. This cost is expected to be recognized over a weighted-average period of2.7 years.

Restricted Stock Units

The RSUs granted to employees for service vest over a four-year period, with25% vesting on the first anniversary of the grant date and the remainder vesting ratably on a quarterly basis thereafter, subject to continued employment. The RSUs granted to non-employee directors generally vest in full on the first anniversary of the grant date. The RSUs granted to non-employee consultants generally vest50% on the first anniversary of the grant date and ratably on a quarterly basis through the second anniversary of the grant date. Some RSUs granted to employees for performance vest upon the completion of defined performance goals, subject to continued employment. The Company’s RSUs are generally classified as equity awards because the RSUs will be paid in the Company's common stock upon vesting. The related compensation expense is recognized over the service period and is based on the grant date fair value of the Company's common stock and the number of shares expected to vest. The fair value of the awards is not remeasured at the end of each reporting period. The awards do not carry voting rights until they are vested and released in accordance with the terms of the award.

Service-Based Awards

The majority of the annual compensation the Company provides to members of its board of directors is paid in the form of RSUs. In addition, certain members of the Company’s board of directors elect to receive the remainder of their annual compensation, or a portion thereof, in the form of RSUs. An aggregate amount of approximately110,000,96,000 and126,000 service-based RSUs were granted to its directors as a result of these elections during the years ended December 31, 2018, 2017 and 2016, respectively, with an estimated grant date fair value of$1.3 million,$1.0 million and$1.0 million, respectively.

During the years ended December 31, 2018, 2017 and 2016, the Company granted approximately900,000,964,000 and573,000 service-based RSUs, respectively, to its employees, with an estimated grant date fair value of$10.7 million,$8.5 million and$4.0 million, respectively.

During the years ended December 31, 2018, 2017 and 2016, the Company granted approximately14,000,8,000 and35,000 service-based RSUs, respectively, to non-employee consultants with an estimated grant date fair value of$0.2 million,$0.1 million and$0.3 million, respectively.

Performance-Based Awards

In March 2018, 2017 and 2016, the Company awarded approximately474,000,1,190,000 and1,335,000 performance-based RSUs, respectively, to the Company’s executives and employees (the “Bonus RSUs”), with an estimated grant date fair value of$5.6 million,$10.5 million and$9.4 million, respectively. Vesting of the Bonus RSUs is and was dependent upon the Company’s achievement of defined performance goals over the respective fiscal year. The Company records stock-based compensation expense related to performance-based RSUs when it is considered probable that the performance conditions will be met. Management believes it is probable that substantially all of the 2018 Bonus RSUs will vest. The level of achievement, if any, of performance goals will be determined by the compensation committee of the Company’s board of directors and, if such goals are achieved, the 2018 Bonus RSUs will vest, subject to continued employment, in March 2019. A portion of the March 2017 Bonus RSUs vested in March 2018 upon the determination of the level of achievement of the performance goals.

Additionally, during 2018, 2017 and 2016, the Company awarded approximately134,000,173,000 and119,000 performance-based RSUs, respectively, to the Company’s executives (the “Executive RSUs”). The estimated aggregate grant date fair values of the Executive RSUs granted in 2018, 2017 and 2016 was$1.6 million,$1.5 million and$0.8 million, respectively. Vesting of the Executive RSUs is and was dependent upon the Company’s achievement of defined performance goals over a two-year period. Management believes it is probable that the Executive RSUs will vest at least in part. The vesting of Executive RSUs will ultimately range from0% to150% of the number of shares underlying the Executive RSU grant based on the level of achievement of the performance goals. If the Company achieves the performance goals,50% of the Executive RSUs will vest on the second anniversary of the grant date and the remaining50% will vest on the third anniversary of the grant date, in each case, subject to the executive's continued service as of the vesting date.

Award Summary

A summary of the Company’s activity for outstanding RSUs is as follows:

	RSUs		Weighted- Average Grant Date Fair Value Per RSU
	(In thousands)
Outstanding at December 31, 2015	1,944		$	7.76
Granted	2,297		$	7.09
Forfeited	(152	)	$	7.44
Released	(766	)	$	7.36
Outstanding at December 31, 2016	3,323		$	7.40
Granted	2,431		$	8.89
Forfeited	(203	)	$	8.42
Released	(2,003	)	$	7.16
Outstanding at December 31, 2017	3,548		$	8.50
Granted	1,632		$	11.87
Forfeited	(163	)	$	9.69
Released	(1,940	)	$	8.64
Outstanding at December 31, 2018	3,077		$	10.13
Vested and unreleased at December 31, 2018 (1)	617

⁽¹⁾ These RSUs were granted to the Company's board of directors as a part of their compensation for board and committee service and had vested but had not yet been issued and released.

As of December 31, 2018, the total unrecognized cost related to non-vested RSUs was approximately$9.5 million. This cost is expected to be recognized over a weighted-average period of1.32 years. The Company recognized$15.2 million,$17.0 million and$13.5 million of stock-based compensation expense related to RSUs in the years ended December 31, 2018, 2017 and 2016, respectively.

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Preferred Stock

12 Months Ended

Dec. 31, 2018

Stockholders' Equity Note [Abstract]

Preferred Stock

Preferred Stock

The Company is authorized to issue2.0 million shares of preferred stock with a par value of$0.0001 per share. As described below, the Company issued1.0 million shares of preferred stock in the fourth quarter of 2012 and0.5 million shares of preferred stock in the second quarter of 2014. The remaining0.5 million authorized shares of preferred stock were undesignated and unissued as of December 31, 2018.

Series A Cumulative Perpetual Convertible Preferred Stock

In the fourth quarter of 2012, the Company issued1.0 million shares of its7.00% Series A Cumulative Perpetual Convertible Preferred Stock (the "Series A Preferred Stock") in a private offering.

During the three months ended March 31, 2018, the Company's daily volume-weighted average stock price remained at or above$12.26 per share for a period of 20 out of 30 trading days, thereby allowing for the conversion of the Series A Preferred Stock at the election of the Company. On March 20, 2018, the Company converted all outstanding shares of its Series A Preferred Stock into shares of common stock, resulting in the issuance of10,599,974 shares of common stock. The Company declared and paid all current and cumulative dividends to holders of record of Series A Preferred Stock as of March 8, 2018. As such, the Company paid cash dividends of$7.0 million to the holders of the Series A Preferred Stock. The Company paid cash dividends of$1.8 million to the holders of the Series A Preferred Stock during the year ended December 31, 2017.

Series B Cumulative Perpetual Convertible Preferred Stock

In May 2014, the Company issued500,000 shares of its Series B Cumulative Perpetual Convertible Preferred Stock (the "Series B Preferred Stock") in an underwritten public offering at a price to the public of$250 per share. The purchase price received by the Company, equal to$242.50 per share, reflected an underwriting discount of$7.50 per share. The Company received proceeds of$120.8 million from the sale of the Series B Preferred Stock, net of the$3.8 million underwriting discount and$0.4 million of offering costs.

As of December 31, 2018, there were497,000 shares of Series B Preferred Stock outstanding. Holders of Series B Preferred Stock are entitled to receive cumulative cash dividends at a rate of6.75% per annum of the$250 liquidation preference per share (equivalent to an annual rate of$16.875 per share). Dividends are payable quarterly in arrears on each March 15, June 15, September 15 and December 15. The Series B Preferred Stock does not have a stated maturity date and is not subject to any sinking fund or mandatory redemption provisions. The Series B Preferred Stock ranks senior to the Company’s common stock with respect to dividend rights and rights upon the Company’s voluntary or involuntary liquidation, dissolution or winding-up. Holders of Series B Preferred Stock generally have no voting rights except for limited voting rights if the Company fails to pay dividends for six or more quarterly periods (whether or not consecutive) and in other specified circumstances. Holders of Series B Preferred Stock may convert some or all of their outstanding Series B Preferred Stock at an initial conversion rate of33.456 shares of common stock per$250 liquidation preference, which is equivalent to an initial conversion price of approximately$7.47 per share of common stock (subject to adjustment in certain events).

In connection with the conversion of the Series A Preferred Stock described above, the Company declared and paid all current and cumulative dividends to holders of record of Series B Preferred Stock as of March 8, 2018. The Company paid cash dividends of$8.4 million to holders of the Series B Preferred Stock during the year ended December 31, 2018. In compliance with the Credit Facility, subsequent to the$8.4 million dividend payment, the Company began the planned suspension of dividends to holders of the Series B Preferred Stock for five quarters, beginning with the dividend payment that otherwise would have been paid on June 15, 2018. The Company paid cash dividends of$2.1 million to holders of the Series B Preferred Stock during the year ended December 31, 2017.

On or after May 15, 2019, the Company may, at its option, convert some or all of the Series B Preferred Stock into the number of shares of common stock that are issuable at the then-applicable conversion rate, subject to specified conditions, including (i) a daily volume-weighted average stock price of at least$11.21 per share over a period of 20 trading days in a 30-day period and (ii) the payment of cumulative dividends. In the event of certain specified fundamental changes, holders of the Series B Preferred Stock will have the right to convert some or all of their shares of Series B Preferred Stock into the greater of (i) a number of shares of the Company’s common stock as subject to adjustment plus the make-whole premium, if any, and (ii) a number of shares of the Company’s common stock equal to the lesser of (a) the liquidation preference divided by the market value of the Company’s common stock on the effective date of such fundamental change and (b)81.9672 (subject to adjustment). In certain circumstances, the Company may elect to cash settle any conversions in connection with a fundamental change. Any suspended dividends are required to be paid prior to conversion by the Company.

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Revenue from Contracts with Customers Revenue (Notes)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer [Text Block]

Revenue

Effective January 1, 2018, the Company adopted ASU No. 2014-09. Under the new standard, the Company performs the following steps to determine the amount of revenue to be recognized: (i) identification of the promised goods or services in the contract; (ii) determination of whether the promised goods or services are performance obligations including whether they are distinct in the context of the contract; (iii) measurement of the transaction price, including the constraint on variable consideration; (iv) allocation of the transaction price to the performance obligations; and (v) recognition of revenue when (or as) the Company satisfies each performance obligation. The Company only applies the five-step model to contracts when it is probable that it will collect the consideration it is entitled to in exchange for the goods or services it transfers to the customer.

In addition, the standard requires disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The Company adopted the standard using the modified retrospective method with a cumulative effect adjustment recorded to reduce opening retained earnings by$15.7 million. This method required application of the new guidance at the beginning of the earliest comparative period presented for revenue agreements that were not substantially complete as of the date of adoption. The Company does not disclose the value of unsatisfied performance obligations because the majority of its contracts have expected lengths of one year or less. The Company did not retrospectively restate contracts with modifications prior to the earliest period presented, but instead reflected the aggregate effect of all modifications at transition.

The Company derives its revenue primarily as a wholesaler of satellite communications products and services. Pursuant to wholesale agreements, the Company sells its products and services to service providers who, in turn, sell the products and services to other distributors or directly to the end users. The primary types of revenue include (i) service revenue (access and usage-based airtime fees), (ii) subscriber equipment revenue, and (iii) revenue generated by providing engineering and support services to commercial and government customers. See Note 2 for a description of the Company's accounting policies in connection with each of these types of arrangements.

The following table summarizes the Company’s services revenue:

	Year Ended December 31,
	2018		2017		2016
	(in thousands)
Commercial voice and data services	$	193,176	$	177,685	$	177,666
Commercial IoT data services	85,054		74,142		65,523
Hosted payload and other data services	40,527		9,908		3,633
Government services	88,000		88,000		88,000
Total services	$	406,757	$	349,735	$	334,822

The following table summarizes the Company’s engineering and support services revenue:

	Year Ended December 31,
	2018		2017		2016
	(in thousands)
Commercial	$	716	$	3,109	$	2,245
Government	17,687		18,083		22,362
Total	$	18,403	$	21,192	$	24,607

The timing of revenue recognition, billings and cash collections results in billed accounts receivable, unbilled receivables (contract assets), and deferred revenue (contract liabilities) on the condensed consolidated balance sheets. The Company bills amounts under its agreed-upon contractual terms at periodic intervals (for services), upon shipment (for equipment), or upon achievement of contractual milestones or as work progresses (for engineering and support services). Billing may occur subsequent to revenue recognition, resulting in accounts receivable (contract assets). The Company may also receive payments from customers before revenue is recognized, resulting in deferred revenue (contract liabilities). The Company recognized revenue that was previously recorded as deferred revenue in the amounts of$18.0 million and$22.7 million for the years ended December 31, 2018 and 2017, respectively. The Company has also recorded costs of obtaining contracts expected to be recovered in prepaid expenses and other assets (contract assets or commissions), that are not separately disclosed on the condensed consolidated balance sheets. The commissions are recognized over the estimated prepaid usage period. The contract assets not separately disclosed are as follows:

	Year Ended December 31,
	2018		2017
	(in thousands)
Contract Assets:
Commissions	$	1,010	$	1,555
Other contract costs	$	3,631	$	3,753

The primary impact of adopting ASU 2014-09 relates to the Company’s prepaid service revenue and associated breakage. Under the new standard, the Company now estimates the expected revenue that will expire unused on an ongoing basis and recognizes this revenue in a manner consistent with the usage period. Upon adoption, the contract liability (deferred revenue associated with prepaid service revenue) was reduced by approximately$15.7 million as a result of the change to include a breakage estimate over the usage period.

Adopting the new standard had an immaterial impact on the Company’s financial statements. The impact of the implementation of the new revenue standard on the Company's condensed consolidated balance sheets, as compared to accounting under prior revenue guidance (Accounting Standards Codification ("ASC") Topic 605), was as follows:

	December 31, 2018
	As reported		Adjustment			Pro forma under ASC 605
	(in thousands)
Prepaid expenses and other current assets	$	18,284	$	527		$	18,811
Deferred revenue	37,429		19,771			57,200
Deferred revenue, net of current portion	74,656		(2,782		)	71,874
Other long-term liabilities	4,160		(3,975		)	185
Retained earnings	$	501,712	$	(12,487	)	$	489,225

The impact of the implementation of the new standard on the Company's condensed consolidated statements of operations and comprehensive income (loss) was as follows:

	Year Ended December 31, 2018
	As reported			Adjustment			Pro forma under ASC 605
	(in thousands)
Service revenue	$	406,757		$	(1,304	)	$	405,453
Cost of services	86,016			(144		)	85,872
Loss before income taxes	(20,649		)	(1,160		)	(21,809		)
Income tax benefit	7,265			411			7,676
Net loss	$	(13,384	)	$	(749	)	$	(14,133	)

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Income Taxes

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

U.S. and foreign components of income before income taxes are presented below:

	Year Ended December 31,
	2018			2017			2016
				(In thousands)
U.S. income (loss)	$	(22,147	)	$	120,281		$	176,448
Foreign income (loss)	1,498			(709		)	1,717
Total income (loss) before income taxes	$	(20,649	)	$	119,572		$	178,165

The components of the Company’s income tax provision were as follows:

	Year Ended December 31,
	2018			2017			2016
				(In thousands)
Current taxes:
Federal tax expense	$	17		$	13		$	1,206
State tax expense	(91		)	422			978
Foreign tax expense	1,163			863			1,141
Total current tax expense	1,089			1,298			3,325
Deferred taxes:
Federal tax expense (benefit)	(9,159		)	(110,811		)	60,295
State tax expense (benefit)	904			(4,851		)	3,454
Foreign tax expense (benefit)	(99		)	80			59
Total deferred tax expense (benefit)	(8,354		)	(115,582		)	63,808
Total income tax expense (benefit)	$	(7,265	)	$	(114,284	)	$	67,133

On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (the “Tax Act”) was signed into law making significant changes to the Internal Revenue Code. Changes include, but are not limited to, a corporate tax rate decrease from35% to21% effective for tax years beginning after December 31, 2017, the transition of U.S international taxation from a worldwide tax system to a territorial system, and a one-time transition tax on the mandatory deemed repatriation of cumulative foreign earnings as of December 31, 2017.

The Securities and Exchange Commission issued Staff Accounting Bulletin No. 118 ("SAB 118") to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Tax Act. SAB 118 was effective for reporting periods that include December 22, 2017. Due to the timing of the enactment and the complexity involved in applying the provisions of the Tax Act, the Company made reasonable estimates of the effects of the Tax Act and recorded provisional amounts in its December 31, 2017 financial statements including the remeasurement of its deferred tax assets/liabilities for an estimated net tax benefit of$150.9 million, as well as an estimated one time taxable income amount of$2.3 million for the deemed repatriation of certain foreign subsidiary untaxed earnings with an estimated deferred tax asset of$0.8 million associated with foreign taxes deemed paid on those earnings. In the fourth quarter of 2018, the Company completed its accounting for the income tax effects of the Tax Act. No material adjustments were required to the provisional amounts initially recorded.

Remeasurement of deferred tax assets/liabilities: In the fourth quarter of 2018, the Company finalized its accounting for the net deferred tax benefit of$150.4 million related to the remeasurement of certain deferred tax assets and liabilities as of December 31, 2017. The Company remeasured those deferred tax assets and liabilities at21%, because this is the rate at which it expects these items to reverse.

Deemed Repatriation of Certain Foreign Subsidiary Earnings: The Tax Act required the Company to increase its 2017 U.S. taxable income for the mandatory deemed repatriation of accumulated foreign subsidiary earnings not previously subject to U.S. income tax at a rate of15.5% to the extent of foreign cash and certain other net current assets and8% on the remaining untaxed earnings. The Company finalized its accounting for this one-time taxable income amount of$3.2 million, with a deferred tax asset associated with foreign taxes deemed paid on those earnings of$0.8 million.

In April 2018, Maryland enacted the single sales factor method for apportioning income to the state to be phased in over five years commencing in 2018. This change results in higher future Maryland state income taxes for the Company, increasing its 2018 income tax provision by$7.0 million for the impact on its existing deferred tax assets and liabilities. If the Company's current estimates change in future periods, the impact on the deferred tax assets and liabilities may change correspondingly.

In 2011 and 2012, Arizona enacted tax law changes resulting in a benefit to the Company’s net deferred tax expense. Due to the size and nature of the Company’s operations in Arizona, such changes have a significant impact on the tax provision in a given period. As a result of this law changes, the Company’s deferred tax expense was reduced by approximately$13.5 million,$10.2 million and$3.0 million for the years ended December 31, 2018, 2017 and 2016 respectively.

A reconciliation of the U.S. federal statutory income tax expense to the Company’s effective income tax provision is below. Any amounts that do not have a meaningful impact on this reconciliation are not separately disclosed.

	Year Ended December 31,
	2018			2017			2016
				(In thousands)
Expected tax expense (benefit) at U.S. federal statutory tax rate	$	(4,336	)	$	41,850		$	62,309
State taxes, net of federal benefit	(3,361		)	5,133			9,757
State tax valuation allowance	10,651			582			(2,710		)
Deferred impact of state tax law changes and elections	(6,481		)	(10,217		)	(2,962		)
Tax Act - deferred tax effects	—			(150,903		)	—
Equity-based compensation	(3,807		)	(977		)	—
Limitation on executive compensation deduction	1,568			26			—
Other nondeductible items	298			110			596
Tax credits	(2,872		)	(528		)	(442		)
Foreign taxes and other adjustments	1,075			640			585
Total income tax expense (benefit)	$	(7,265	)	$	(114,284	)	$	67,133

The components of deferred tax assets and liabilities are as follows:

	December 31,
	2018			2017
	(In thousands)
Deferred tax assets
Long-term contracts	$	70,518		$	61,358
Federal, state and foreign net operating loss carryforwards and tax credits	277,678			107,566
Other	20,002			22,680
Total deferred tax assets	368,198			191,604
Valuation allowance	(14,174		)	(3,815		)
Net deferred tax assets	354,024			187,789
Deferred tax liabilities
Fixed assets, intangibles and research and development expenditures	(529,037		)	(403,545		)
Investment in joint venture	(57,686		)	(27,796		)
Other	(8,357		)	(2,276		)
Total deferred tax liabilities	(595,080		)	(433,617		)
Net deferred income tax liabilities	$	(241,056	)	$	(245,828	)

Pursuant to ASC 740, the Company nets deferred tax assets and liabilities within the same jurisdiction. As of December 31, 2018, the Company had a net deferred tax asset of$0.4 million that is included in other assets on the balance sheet and a net deferred tax liability of$241.4 million.

The Company recognizes valuation allowances to reduce deferred tax assets to the amount that is more likely than not to be realized. In assessing the likelihood of realization, management considers: (i) future reversals of existing taxable temporary differences; (ii) future taxable income exclusive of reversing temporary differences and carryforwards; (iii) taxable income in prior carryback year(s) if carryback is permitted under applicable tax law; and (iv) tax planning strategies.

The Company had deferred tax assets related to cumulative U.S. federal net operating loss carryforwards of approximately$219.6 million and$80.5 million as of December 31, 2018 and 2017, respectively. The pre-2018 U.S. federal net operating loss carryforwards if unutilized, will expire in various amounts from 2031 through 2037. Pursuant to the Tax Act, the 2018 U.S. federal net operating loss carryforwards do not expire. The Company believes that the U.S. federal net operating losses will be utilized before the expiration dates and, as such, no valuation allowance has been established for these deferred tax assets. The Company had deferred tax assets related to the state net operating loss carryforwards of approximately$36.7 million and$10.9 million as of December 31, 2018 and 2017, respectively, that expire from 2025 through 2038. The Company does not expect to fully utilize all of its state net operating losses within the respective carryforward periods and as such reflects a partial valuation allowance of$11.4 million and$0.7 million as of December 31, 2018 and 2017, respectively, against these deferred tax assets on its consolidated balance sheet. The Company had deferred tax assets related to the foreign net operating loss carryforwards of approximately$0.9 million and$1.3 million as of December 31, 2018 and 2017, respectively, that begin to expire in 2023. The Company does not expect to fully utilize all of its foreign net operating losses within the carryforward periods and as such reflects a partial valuation allowance against these deferred tax assets on its consolidated balance sheet. The timing and manner in which the Company will utilize the net operating loss carryforwards in any year, or in total, may be limited in the future as a result of changes in the Company’s ownership and any limitations imposed by the jurisdictions in which the Company operates.

The Company has approximately$8.4 million and$6.1 million of deferred tax assets related to research and development tax credits as of December 31, 2018 and 2017, respectively, that expire in various amounts from 2029 through 2038. The Company has approximately$5.2 million and$4.7 million of deferred tax assets related to foreign tax credits as of December 31, 2018 and 2017, respectively, that expire in various amounts from 2020 through 2028. The Company has$3.6 million and$3.8 million of deferred tax assets related to Alternative Minimum Tax credits as of December 31, 2018 and 2017, respectively, which do not expire. Under the Tax Act, the Alternative Minimum Tax credits will convert to refunds if not used as a credit. The Company believes that the research and development credits will be fully utilized within the carryforward period. However, the Company does not expect to utilize all of its foreign tax credits within the respective carryforward periods. As such, the Company has a partial valuation allowance of$1.1 million as of December 31, 2018, which is unchanged from December 31, 2017.

The Company has provided for U.S. income taxes on all undistributed earnings of its significant foreign subsidiaries since the Company does not indefinitely reinvest these undistributed earnings. The Company measures deferred tax assets and liabilities using tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The Company recognizes the effect on deferred tax assets and liabilities of a change in tax rates in income in the period that includes the enactment date.

Uncertain Income Tax Positions

The Company is subject to income taxes in the U.S. and various state and foreign jurisdictions. Significant judgment is required in evaluating tax positions and determining the provision for income taxes. The Company establishes liabilities for tax-related uncertainties based on estimates of whether, and the extent to which, additional taxes may be due. These liabilities are established when the Company believes that certain positions might be challenged despite its belief that its tax return positions are fully supportable. The Company adjusts these liabilities in light of changing facts and circumstances, such as the outcome of a tax audit. The provision for income taxes includes the impact of changes to these liabilities.

The amount of unrecognized tax benefits was$1.1 million and$1.0 million at December 31, 2018 and 2017, respectively. Any changes in the next twelve months are not anticipated to have a significant impact on the results of operations, financial position or cash flows of the Company. All of the Company’s uncertain tax positions, if recognized, would affect its income tax expense.

The Company has elected an accounting policy to classify interest and penalties related to unrecognized tax benefits as a component of income tax expense. As of December 31, 2018 and 2017, potential interest and penalties on unrecognized tax benefits were not significant.

The Company is subject to tax audits in all jurisdictions for which it files tax returns. Tax audits by their very nature are often complex and can require several years to complete. Currently, there are no U.S. federal, state or foreign jurisdiction tax audits pending. The Company’s corporate U.S. federal and state tax returns from 2010 to 2017 remain subject to examination by tax authorities and the Company’s foreign tax returns from 2011 to 2017 remain subject to examination by tax authorities.

The following is a tabular reconciliation of the total amounts of unrecognized tax benefits which includes related interest and penalties:

	2018		2017
	(In thousands)
Balance at January 1,	$	1,046	$	920
Change attributable to tax positions taken in a prior period	50		146
Change attributable to final assessment	—		(27		)
Change attributable to tax positions taken in the current period	16		10
Decrease attributable to lapse of statute of limitations	—		(3		)
Balance at December 31,	$	1,112	$	1,046

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Net Income (Loss) Per Share

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Net Income (Loss) Per Share

Net Income (Loss) Per Share

The computations of basic and diluted net income (loss) per share are set forth below:

	Year Ended December 31,
	2018			2017			2016
	(In thousands, except per share data)
Numerator:
Net income (loss) attributable to common stockholders (numerator for basic net income per share)	$	(23,533	)	$	218,420		$	95,596
Net (income) loss allocated to participating securities	—			(215		)	(123		)
Numerator for basic net income (loss) per share	(23,533		)	218,205			95,473
Dividends on Series A preferred stock, declared and undeclared	—			7,000			7,000
Dividends on Series B preferred stock, declared and undeclared	—			8,436			8,436
Numerator for diluted net income (loss) per share	$	(23,533	)	$	233,641		$	110,909
Denominator: Denominator for basic net income (loss) per share - weighted   average outstanding common shares	108,975			97,934			95,967
Dilutive effect of stock options	—			1,558			250
Dilutive effect of Performance RSUs	—			1,308			1,328
Dilutive effect of Series A preferred stock	—			10,602			10,602
Dilutive effect of Series B preferred stock	—			16,728			16,728
Denominator for diluted net income (loss) per share	108,975			128,130			124,875
Net income (loss) per share attributable to common stockholders - basic	$	(0.22	)	$	2.23		$	1.00
Net income (loss) per share attributable to common stockholders - diluted	$	(0.22	)	$	1.82		$	0.89

For the year ended December 31, 2018,0.7 million unvested performance-based RSUs were not included in the computation of basic and diluted net income per share, as certain performance criteria have not been satisfied, and options to purchase0.1 million shares of common stock were not included in the computation of basic and diluted net loss per share, as the effect would be anti-dilutive. Due to the Company’s net loss for the year ended December 31, 2018, all potential common stock equivalents were anti-dilutive. For the year ended December 31, 2018, 16.7 million as-if converted shares of the Series B Preferred Stock were not included in the computation of diluted net loss per share, as the effect would be anti-dilutive.

For the year ended December 31, 2017,2.1 million unvested service-based RSUs were excluded from the computation of basic net income per share and not included in the computation of diluted net income per share, as the effect would be anti-dilutive, and0.2 million unvested performance-based RSUs were not included in the computation of basic and diluted net income per share, as certain performance criteria have not been satisfied. For the year ended December 31, 2016, options to purchase3.2 million shares of common stock were not included in the computation of diluted net income per share, as the effect would be anti-dilutive, and1.4 million unvested service-based RSUs were excluded from the computation of basic net income per share and not included in the computation of diluted net income per share, as the effect would be anti-dilutive.

For the year ended December 31, 2018,$6.3 million in cumulative unpaid dividends to holders of the Series B Preferred Stock was not declared or accrued as a result of all cash dividends being suspended in connection with the amendments to the Credit Facility described in Note 7, but such amounts were deducted to arrive at net loss attributable to common stockholders. For the year ended December 31, 2017,$5.3 million and$6.3 million in cumulative unpaid dividends to holders of the Series A Preferred Stock and Series B Preferred Stock, respectively, were not declared or accrued as a result of all cash dividends being suspended, but such amounts were deducted to arrive at net income attributable to common stockholders.

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Related Party Transaction Disclosure Related Party Transactions

12 Months Ended

Dec. 31, 2018

Related Party Transactions [Abstract]

Related Party Transactions Disclosure

Related Party Transactions

Aireon LLC

The Iridium NEXT constellation hosts the Aireon system, which will provide a global air traffic surveillance service through a series of automatic dependent surveillance-broadcast ("ADS-B") receivers on the Iridium NEXT satellites. Iridium formed Aireon LLC ("Aireon") in 2011, with subsequent investments from the air navigation service providers ("ANSPs") of Canada, Italy, Denmark, Ireland and the United Kingdom, to develop and market this service. Aireon has contracted to pay Iridium a fee to host the ADS-B receivers on Iridium NEXT, as well as data service fees for the delivery of the air traffic surveillance data over the Iridium NEXT system. Pursuant to agreements with Aireon, Aireon will pay Iridium fees of$200.0 million to host the ADS-B receivers on Iridium NEXT and additional power fees of approximately$2.8 million per year (the "Hosting Agreement"), as well as data services fees of up to approximately$19.8 million per year for the delivery of the air traffic surveillance data over the Iridium NEXT system (the "Data Services Agreement"). The Aireon ADS-B receivers on the Iridium NEXT satellites are activated on an individual basis as the Iridium NEXT satellite begins carrying traffic.

At December 31, 2018, the Company had a fully diluted ownership stake in Aireon's holding company, Aireon Holdings LLC, of approximately35.7%, subject to certain redemption provisions contained in the Aireon Holdings LLC Amended and Restated Limited Liability Company Agreement (the "Aireon Holdings LLC Agreement").

Under the Hosting Agreement, the$200.0 million due is interest-bearing for amounts not paid on time. The Company had previously determined there was not sufficient support that Aireon will be able to make the payments due under the Hosting Agreement. During 2018, the Company and Aireon amended certain terms of the Hosting Agreement. As amended, the Company is scheduled to receive minimum payments corresponding to hosting services rendered. The first payment of$8.1 million was received during the second quarter of 2018. In December 2018, Aireon entered into a credit facility that resulted in settlement of$35.0 million in hosting receivables, paid directly to the Company's Credit Facility lenders by Aireon. Cumulative consideration for the year ended December 31, 2018 was approximately$43.1 million. No similar amounts were settled in previous years under the Hosting Agreement. Aireon continues to be obligated to pay the Company in full the remaining portion of the$200.0 million in hosting fees when Aireon is able to raise funds to do so. As a result of the amendment and an updated financial collectability assessment, as of December 31, 2018, the Company recognized$13.9 million of revenue related to total cumulative hosting services rendered to date.

Under the Data Services Agreement, Aireon pays the Company monthly data service payments on a per satellite basis beginning on each satellite's in-service date. The Company recorded data service revenue from Aireon of$9.1 million for the year ended December 31, 2018. Revenues recorded for the year ended December 31, 2017 were immaterial.

Under two services agreements, the Company also provides administrative services and support services, including services relating to Aireon's hosted payload operations center to Aireon, which are paid monthly. The Company also subleases office space to Aireon. Aireon receivables due to the Company under all agreements totaled$1.0 million and$0.6 million at December 31, 2018 and 2017, respectively.

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Segments, Significant Customers, Supplier and Service Providers and Geographic Information

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Segments, significant customers, supplier and service providers and geographic information

Segments, Significant Customers, Supplier and Service Providers and Geographic Information

The Company operates in one business segment, providing global satellite communications services and products.

The Company derived approximately20%,24% and25% of the Company’s total revenue in the years ended December 31, 2018, 2017 and 2016, respectively, from prime contracts or subcontracts with agencies of the U.S. government. For the years ended December 31, 2018, 2017 and 2016, no single commercial customer accounted for more than10% of the Company’s total revenue.

Approximately34% and35% of the Company’s accounts receivable balance at December 31, 2018 and 2017, respectively, was due from prime contracts or subcontracts with agencies of the U.S. government. As of December 31, 2018 and 2017, no single commercial customer accounted for more than10% of the Company’s total accounts receivable balance.

The Company contracts for the manufacture of its subscriber equipment primarily from a limited number of manufacturers and utilizes other sole source suppliers for certain component parts of its devices. Should events or circumstances prevent the manufacturer or the suppliers from producing the equipment or component parts, the Company’s business could be adversely affected until the Company is able to move production to other facilities of the manufacturer or secure a replacement manufacturer or an alternative supplier for such component parts.

Net property and equipment by geographic area was as follows:

	December 31,
	2018		2017
	(In thousands)
United States	$	188,203	$	165,337
Satellites in orbit	2,504,734		926,090
Iridium NEXT systems under construction (United States)	658,395		2,088,380
All others (1)	19,523		30,355
Total	$	3,370,855	$	3,210,162

⁽¹⁾  No single country in this group represented more than10% of property and equipment, net.

Revenue by geographic area was as follows:

	Year Ended December 31,
	2018		2017		2016
			(In thousands)
United States	$	276,398	$	229,741	$	226,190
Canada	48,511		44,107		42,373
United Kingdom	51,344		46,245		47,135
Other countries (1)	146,755		127,953		117,942
Total	$	523,008	$	448,046	$	433,640

⁽¹⁾  No single country in this group represented more than10% of revenue.

Revenue is attributed to geographic area based on the billing address of the distributor. Service location and the billing address are often not the same. The Company’s distributors sell services directly or indirectly to end users, who may be located or use the Company’s products and services elsewhere. The Company cannot provide the geographical distribution of end users because it does not contract directly with them. The Company is exposed to foreign currency exchange fluctuations as foreign currency exchange rate movements create a degree of risk by affecting the U.S. dollar value of sales made and costs incurred in foreign currencies.

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Employee Benefit Plan

12 Months Ended

Dec. 31, 2018

Retirement Benefits [Abstract]

Employee Benefit Plan

Employee Benefit Plan

The Company sponsors a defined-contribution 401(k) retirement plan (the “Plan”) that covers all employees. Employees are eligible to participate in the Plan on the first day of the month following the date of hire, and participants are100% vested from the date of eligibility. The Company matches employees’ contributions equal to100% of the salary deferral contributions up to5% of the employees’ eligible compensation each pay period. Company-matching contributions to the Plan were$3.0 million,$2.5 million and$1.3 million for the years ended December 31, 2018, 2017 and 2016, respectively.

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Selected Quarterly Information (Unaudited)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Information (Unaudited)

Selected Quarterly Information (Unaudited)

The following represents the Company’s unaudited quarterly results:

	Quarter Ended
	March 31, 2018		June 30, 2018			September 30, 2018			December 31, 2018
	(In thousands, except per share data)
Revenue	$	119,148	$	134,931		$	136,764		$	132,165
Operating income (loss)	$	19,439	$	16,345		$	6,011		$	(142	)
Net income (loss)	$	11,472	$	(4,418	)	$	(12,856	)	$	(7,582	)
Net income (loss) per common share - basic	$	0.08	$	(0.06	)	$	(0.13	)	$	(0.09	)
Net income (loss) per common share - diluted	$	0.07	$	(0.06	)	$	(0.13	)	$	(0.09	)

	Quarter Ended
	March 31, 2017		June 30, 2017		September 30, 2017		December 31, 2017
	(In thousands, except per share data)
Revenue	$	104,426	$	111,604	$	116,547	$	115,469
Operating income (loss) (1)	$	55,602	$	35,742	$	38,082	$	(13,950	)
Net income (2)	$	37,948	$	24,778	$	29,253	$	141,877
Net income per common share - basic	$	0.35	$	0.21	$	0.26	$	1.40
Net income per common share - diluted	$	0.30	$	0.20	$	0.23	$	1.10

⁽¹⁾  Includes accelerated depreciation of$36.8 million in the fourth quarter of 2017 associated with the write-off of the full amount previously paid to Kosmotras which decreased operating income. Also includes the impact of$14.2 million related to the gain on the transaction with Boeing, effective January 3, 2017.

⁽²⁾ Includes the provisional estimated impact of the Tax Act enacted in December 2017 on the Company's deferred tax assets and liabilities. Immaterial adjustments to these provisional amounts were made in 2018.

The sum of the per share amounts does not equal the annual amounts due to changes in the weighted-average number of common shares outstanding during the year.

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Significant Accounting Policies and Basis of Presentation (Policies)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Principles of Consolidation and Basis of Presentation

Principles of Consolidation and Basis of Presentation

The Company has prepared the consolidated financial statements in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”). The accompanying consolidated financial statements include the accounts of (i) the Company, (ii) its wholly owned subsidiaries, and (iii) all less than wholly owned subsidiaries that the Company controls. All material intercompany transactions and balances have been eliminated.

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ materially from those estimates.

Adopted Accounting Pronouncements

Adopted Accounting Pronouncements

Effective January 1, 2018, the Company adopted Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”), that supersedes nearly all existing revenue recognition guidance under U.S. GAAP. See Note 11 for more detail on the Company's adoption of ASU 2014-09.

Recent Accounting Developments Not Yet Adopted

Recent Accounting Developments Not Yet Adopted

In February 2016, the FASB issued ASU No. 2016-02, Leases (“ASU 2016-02”). ASU 2016-02 requires lessees to record most leases on their balance sheets but recognize expenses on their income statements in a manner similar to current accounting. The Company is applying the new guidance as of the effective date of January 1, 2019. Reporting organizations are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. The Company established a project team in order to analyze the effect of the standard on its leases by reviewing its current accounting policies to identify potential differences which would result from applying the requirements of the new standard to its leases. The Company will utilize the practical expedient to address all current operating leases for which it is the lessor and the lessee. On January 1, 2019, a lease liability and related right-of-use asset was recognized for operating lease arrangements where the Company is the lessee.

Fair Value Measurements

Fair Value Measurements

The Company evaluates assets and liabilities subject to fair value measurements on a recurring and non-recurring basis to determine the appropriate level to classify them for each reporting period. This determination requires significant judgments to be made by management of the Company. The instruments identified as subject to fair value measurements on a recurring basis are cash and cash equivalents, marketable securities, prepaid expenses and other current assets, accounts receivable, accounts payable and accrued expenses and other current liabilities. Fair value is the price that would be received from the sale of an asset or paid to transfer a liability assuming an orderly transaction in the most advantageous market at the measurement date. U.S. GAAP establishes a hierarchical disclosure framework which prioritizes and ranks the level of observability of inputs used in measuring fair value. The fair value hierarchy consists of the following tiers:

• Level 1, defined as observable inputs such as quoted prices in active markets for identical assets or liabilities;

• Level 2, defined as observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and

• Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

The carrying values of short-term financial instruments (primarily cash and cash equivalents, prepaid expenses and other current assets, accounts receivable, accounts payable, and accrued expenses and other current liabilities) approximate their fair values because of their short-term nature. The fair value of the Company’s investments in money market funds approximates its carrying value; such instruments are classified as Level 1 and are included in cash and cash equivalents on the accompanying consolidated balance sheets.

The fair value of the Company’s investments in commercial paper and short-term U.S. agency securities with original maturities of less than ninety days approximates their carrying value; such instruments are classified as Level 2 and are included in cash and cash equivalents on the accompanying consolidated balance sheets. The fair value of the Company’s investments in fixed-income debt securities and commercial paper with original maturities of greater than ninety days are obtained using similar investments traded on active securities exchanges and are classified as Level 2. For fixed income securities that do not have quoted prices in active markets, the Company uses third-party vendors to price its debt securities resulting in classification as Level 2. All fixed-income securities are included in marketable securities on the accompanying consolidated balance sheets.

Concentrations of Credit Risk

Concentrations of Credit Risk

Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents, marketable securities, and receivables. The majority of cash is invested into a money market fund with U.S. treasuries, Agency Mortgage Backed Securities and/or U.S. Government guaranteed debt. While the Company maintains its cash and cash equivalents with financial institutions with high credit ratings, it often maintains those deposits in federally insured financial institutions in excess of federally insured limits. When the Company holds marketable securities, they are highly-rated corporate and foreign fixed-income debt securities and commercial paper with an original maturity in excess of ninety days. The Company performs credit evaluations of its customers’ financial condition and records reserves to provide for estimated credit losses. Accounts receivable are due from both domestic and international customers.

Cash, Cash Equivalents and Restricted Cash

Cash, Cash Equivalents and Restricted Cash

The Company considers all highly liquid investments with original maturities of ninety days or less to be cash equivalents. These investments, along with cash deposited in institutional money market funds, regular interest bearing depository accounts and non-interest bearing depository accounts, are classified as cash and cash equivalents on the accompanying consolidated balance sheets. The Company is required to maintain a minimum cash reserve for debt service related to its credit facility with Bpifrance Assurance Export S.A.S. ("BPIAE") (as amended to date, the "Credit Facility").

Marketable Securities

Marketable Securities

Marketable securities consist of fixed-income debt securities and commercial paper with an original maturity in excess of ninety days. These investments are classified as available-for-sale and are included in marketable securities within current assets on the accompanying consolidated balance sheets. All investments are carried at fair value. Unrealized gains and losses, net of taxes, are reported as a component of other comprehensive income or loss. The specific identification method is used to determine the cost basis of the marketable securities sold.

Accounts Receivable

Accounts Receivable

Trade accounts receivable are recorded at the invoiced amount and are subject to late fee penalties. Management develops its estimate of an allowance for uncollectible receivables based on the Company’s experience with specific customers, aging of outstanding invoices, its understanding of customers’ current economic circumstances and its own judgment as to the likelihood that the Company will ultimately receive payment. The Company writes off its accounts receivable when balances ultimately are deemed uncollectible.

Foreign Currencies

Foreign Currencies

The functional currency of the Company’s foreign consolidated subsidiaries is the local currency. Assets and liabilities of its foreign subsidiaries are translated to U.S. dollars based on exchange rates at the end of the reporting period. Income and expense items are translated at the weighted-average exchange rates prevailing during the reporting period. Translation adjustments are accumulated in a separate component of stockholders’ equity. Transaction gains or losses are classified as other income (expense), net in the accompanying consolidated statements of operations and comprehensive income (loss). In instances where the financial statements of a foreign entity in a highly inflationary economy are material, they are remeasured as if the functional currency were the reporting currency. In these instances, the financial statements of those entities are remeasured into the reporting currency. A highly inflationary economy is one that has cumulative inflation of approximately 100% or more over a three-year period.

Deferred Financing Costs

Deferred Financing Costs

Direct and incremental costs incurred in connection with securing debt financing are deferred and are amortized as additional interest expense using the effective interest method over the term of the related debt.

Capitalized Interest

Capitalized Interest

Interest costs associated with financing the Company’s assets during the construction period of Iridium NEXT have been capitalized.

Inventory

The Company has a manufacturing agreement with Benchmark Electronics Inc. (“Benchmark”) to manufacture most of its subscriber equipment. Pursuant to the agreement, the Company may be required to purchase excess materials at cost plus a contractual markup if the materials are not used in production within the periods specified in the agreement. Benchmark will then repurchase such materials from the Company at the same price paid by the Company, as required for the production of the subscriber equipment.

Inventory

Inventory consists primarily of finished goods, although the Company at times also maintains an inventory of raw materials from third-party manufacturers. The Company outsources manufacturing of subscriber equipment to a third-party manufacturer and purchases accessories from third-party suppliers. The Company’s cost of inventory includes an allocation of overhead, including payroll and payroll-related costs of employees directly involved in bringing inventory to its existing condition, and freight. Inventories are valued using the average cost method and are carried at the lower of cost or net realizable value.

Stock-Based Compensation

Stock-Based Compensation

The Company accounts for stock-based compensation at fair value. The fair value of stock options is determined at the grant date using the Black-Scholes option pricing model. The fair value of restricted stock units (“RSUs”) is equal to the closing price of the underlying common stock on the grant date. The fair value of an award that is ultimately expected to vest is recognized on a straight-line basis over the requisite service or performance period and is classified in the consolidated statements of operations and comprehensive income in a manner consistent with the classification of the recipient’s compensation. The expected vesting of the Company’s performance-based RSUs is based upon the probability that the Company achieves the defined performance goals. The level of achievement of performance goals, if any, is determined by the compensation committee. Stock-based awards to non-employee consultants are expensed at their fair value as services are provided according to the terms of their agreements and are classified in selling, general and administrative expenses in the accompanying consolidated statements of operations and comprehensive income.

Property and Equipment

The estimated useful lives of the Company’s first-generation satellites reflected the expected use for each satellite. Satellites were depreciated on a straight-line basis through the date they were replaced by next-generation satellites. The Company completed its launches of the next-generation satellites in early 2019. Iridium NEXT satellites will be depreciated on a straight-line basis over their estimated useful life, which is currently12.5 years.

The Company calculates depreciation expense using the straight-line method and evaluates the appropriateness of the useful life used in this calculation on a quarterly basis or as events occur that require additional assessment. 

Repairs and maintenance costs are expensed as incurred.

Property and Equipment

Property and equipment is carried at cost less accumulated depreciation.

Long-Lived Assets

Long-Lived Assets

The Company assesses its long-lived assets for impairment when indicators of impairment exist. Recoverability of assets is measured by comparing the carrying amounts of the assets to the future undiscounted cash flows expected to be generated by the assets. Any impairment loss would be measured as the excess of the assets’ carrying amount over their fair value.

In June 2011, the Company entered into an agreement with International Space Company Kosmotras ("Kosmotras"), as a supplemental launch services provider for Iridium NEXT. The original cost under the Kosmotras agreement was$51.8 million. Kosmotras to date has been unable to obtain the permits or authorizations to launch the Company's satellites on a Dnepr rocket as planned, and Kosmotras has proposed no satisfactory alternative launch plan. As the Company believed the construction-in-progress associated with the Kosmotras launch services will no longer be used or further developed, the Company wrote-off the full amount previously paid to Kosmotras, by recording accelerated depreciation expense of$36.8 million, in the fourth quarter of 2017. There were no similar write-offs during the years ended December 31, 2018 and 2016.

Intangible Assets

Intangible Assets

The Company’s intangible assets with finite lives are amortized over their useful lives and reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. If any indicators were present, the Company would test for recoverability by comparing the carrying amount of the asset to the net undiscounted cash flows expected to be generated from the asset. If those net undiscounted cash flows do not exceed the carrying amount (i.e., the asset is not recoverable), the Company would perform the next step, which is to determine the fair value of the asset and record an impairment loss, if any. The Company evaluates the useful lives for these intangible assets each reporting period to determine whether events and circumstances warrant a revision in their remaining useful lives.

Revenue Recognition

Revenue Recognition

The Company derives its revenue primarily as a wholesaler of satellite communications products and services. The primary types of revenue include (i) service revenue (access and usage-based airtime fees), (ii) subscriber equipment revenue, and (iii) revenue generated by providing engineering and support services to commercial and government customers. In addition to the discussion immediately below, see Note 11 for further discussion of the Company's revenue recognition.

Wholesaler of satellite communications products and services

Pursuant to wholesale agreements, the Company sells its products and services to service providers who, in turn, sell the products and services to other distributors or directly to the end users. The Company recognizes revenue when an arrangement exists, services or equipment are transferred, the transaction price is determined, the arrangement has commercial substance, and collection of consideration is probable.

Contracts with multiple performance obligations

At times, the Company sells services and equipment through arrangements that bundle equipment, airtime and other services. For these revenue arrangements when the Company sells services and equipment in bundled arrangements and determines that it has separate distinct performance obligations, the Company allocates the bundled contract price among the various performance obligations based on each deliverable’s stand-alone selling price. If the stand-alone selling price is not directly observable, the Company estimates the amount to be allocated for each performance obligation based on observable market transactions or the residual approach. When the Company determines the performance obligations are not distinct, the Company recognizes revenue on a combined basis as the last obligation is satisfied. To the extent the Company's contracts include variable consideration, the transaction price includes both fixed and variable consideration. The variable consideration contained within the Company's contracts with customers may include discounts, credits and other similar items. When a contract includes variable consideration, the Company evaluates the estimate of the variable consideration to determine whether the estimate needs to be constrained; therefore, the Company includes the variable consideration in the transaction price only to the extent that it is probable that a significant reversal of the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved. Variable consideration estimates are updated at the end of each quarter. 

Service revenue sold on a stand-alone basis

Service revenue is generated from the Company’s service providers through usage of its satellite system and through fixed monthly access fees per user charged to service providers. Revenue for usage is recognized when usage occurs. Revenue for fixed-per-user access fees is recognized over the usage period in which the services are provided to the end user. The Company sells prepaid services in the form of e-vouchers and prepaid cards. A liability is established equal to the cash paid upon purchase for the e-voucher or prepaid card. On January 1, 2018, upon the adoption of ASU 2014-09, the Company now (i) recognizes revenue from the prepaid services upon the use of the e-voucher or prepaid card by the customer and (ii) estimates the expected revenue that will expire unused on an ongoing basis and recognizes this revenue in a manner consistent with the usage period. Prior to January 1, 2018, revenue from unused prepaid services was recognized upon expiration of the prepaid card. The Company does not offer refunds for unused prepaid services.

Services sold to the U.S. government

The Company provides airtime and airtime support to U.S. government and other authorized customers pursuant to the Enhanced Mobile Satellite Services (“EMSS”) contract managed by Air Force Space Command. Under the terms of this agreement, authorized customers continue to utilize airtime services, provided through the U.S. Department of Defense’s (“DoD”) dedicated gateway. These services include unlimited global secure and unsecure voice, low and high-speed data, paging, broadcast and Distributed Tactical Communications Services (“DTCS”) services for an unlimited number of DoD and other federal subscribers. The EMSS contract was extended for an additional six months at the annual rate of$88 million per year for the remaining term and now expires in April 2019. Under this contract, revenue is based on the annual fee for the fixed-price contract with unlimited subscribers, and is recognized on a straight-line basis over each contractual year. The U.S. government purchases its subscriber equipment from third-party distributors and not directly from the Company.

Subscriber equipment sold on a stand-alone basis

The Company recognizes subscriber equipment sales and the related costs when title to the equipment (and the risks and rewards of ownership) passes to the customer, typically upon shipment. Customers do not have rights of return without prior consent from the Company.

Government engineering and support services

The Company provides maintenance services to the U.S. government’s dedicated gateway. This revenue is recognized ratably over the periods in which the services are provided; the related costs are expensed as incurred.

Other government and commercial engineering and support services

The Company also provides engineering services to assist customers in developing new technologies for use on the Company’s satellite system. The revenue associated with fixed-fee contracts is recognized over time using costs incurred to date relative to total estimated costs at completion to measure progress toward satisfying its performance obligation. The Company does not include purchases of goods from a third party in its evaluation of costs incurred. Incurred costs represent work performed, which corresponds with, and thereby best depicts, the transfer of control to the customer. Revenue on cost-plus-fixed-fee contracts is recognized to the extent of estimated costs incurred plus the applicable fees earned. The Company considers fixed fees under cost-plus-fixed-fee contracts to be earned in proportion to the allowable costs incurred in performance of the contract.

Research and Development

Research and Development

Research and development costs are charged to expense in the period in which they are incurred.

Advertising Costs

Advertising Costs

Costs associated with advertising and promotions are expensed as incurred.

Income Taxes

Income Taxes

The Company accounts for income taxes using the asset and liability approach, which requires the recognition of tax benefits or expenses for temporary differences between the financial reporting and tax bases of assets and liabilities. A valuation allowance is established when necessary to reduce deferred tax assets to the amounts expected to be realized. The Company also recognizes a tax benefit from uncertain tax positions only if it is “more likely than not” that the position is sustainable based on its technical merits. The Company’s policy is to recognize interest and penalties on uncertain tax positions as a component of income tax expense.

Net Income (Loss) Per Share

Net Income (Loss) Per Share

The Company calculates basic net income (loss) per share by dividing net income (loss) attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. Diluted net income (loss) per share takes into account the effect of potential dilutive common shares when the effect is dilutive. The effect of potential dilutive common shares, including common stock issuable upon exercise of outstanding stock options, is computed using the treasury stock method. The effect of potential dilutive common shares from the conversion of the outstanding convertible preferred securities is computed using the as-if converted method at the stated conversion rate. The Company’s unvested RSUs awarded to the board of directors contain non-forfeitable rights to dividends and therefore are considered to be participating securities in periods of net income. The calculation of basic and diluted net income (loss) per share excludes net income attributable to these unvested RSUs from the numerator and excludes the impact of these unvested RSUs from the denominator.

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Significant Accounting Policies and Basis of Presentation (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Schedule of Stock-Based Compensation

Classification of stock-based compensation by line item on the balance sheet and statement of operations is presented below:

	Year Ended December 31,
	2018		2017
	(In thousands)
Property and equipment, net	$	1,865	$	2,326
Inventory	234		280
Prepaid and other current assets	138		132
Cost of subscriber equipment	26		30
Cost of services (exclusive of depreciation and amortization)	3,600		4,366
Research and development	340		349
Selling, general and administrative	10,524		11,211
Total stock-based compensation	$	16,727	$	18,694

Property and Equipment Estimated Useful Lives

Property and equipment is carried at cost less accumulated depreciation. Depreciation is calculated using the straight-line method over the following estimated useful lives:

First-generation satellites	15-21 years
Next-generation satellites	12.5 years
Ground system	5-7 years
Equipment	3-5 years
Internally developed software and purchased software	3-7 years
Building	39 years
Building improvements	5-39 years
Leasehold improvements	shorter of useful life or remaining lease term

Finite-Lived Intangible Assets Useful Lives

Amortization is calculated using the straight-line method over the following estimated useful lives:

Intellectual property	20 years
Assembled workforce	7 years
Patents	14 - 20 years

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Cash and Cash Equivalents and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2018

Cash and Cash Equivalents [Abstract]

Summary of Company's Cash and Cash Equivalents

The following table summarizes the Company’s cash and cash equivalents:

	December 31,				Recurring Fair Value Measurement
	2018		2017
	(In thousands)
Cash and cash equivalents:
Cash	$	20,879	$	24,092
Money market funds	252,473		251,950		Level 2
Commercial paper	—		9,831		Level 2
Total cash and cash equivalents	$	273,352	$	285,873

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Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and equipment consisted of the following:

	December 31,
	2018			2017
	(In thousands)
Satellite system	$	2,766,627		$	1,199,794
Ground system	60,656			67,576
Equipment	42,152			35,616
Internally developed software and purchased software	215,252			191,089
Building and leasehold improvements	30,517			32,130
Total depreciable property and equipment	3,115,204			1,526,205
Less: accumulated depreciation	(453,463		)	(432,833		)
Total depreciable property and equipment, net of accumulated depreciation	2,661,741			1,093,372
Land	8,037			8,037
Construction-in-process:
Iridium NEXT systems under construction	658,395			2,088,380
Other construction-in-process	42,682			20,373
Total property and equipment, net of accumulated depreciation	$	3,370,855		$	3,210,162

Other construction in process

Other construction-in-process consisted of the following:

	December 31,
	2018		2017
	(In thousands)
Internally developed software	$	27,725	$	14,782
Equipment	12,841		4,241
Ground system	2,116		1,350
Total other construction-in-process	$	42,682	$	20,373

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Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of identifiable intangible assets

The Company had identifiable intangible assets as follows:

	December 31, 2018
	Useful Life (years)	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
	(In thousands)
Indefinite life intangible assets:
Trade names	Indefinite	$	21,195	$	—		$	21,195
Spectrum and licenses	Indefinite	14,030		—			14,030
Total		35,225		—			35,225
Definite life intangible assets:
Intellectual property	20 years	16,439		(7,434		)	9,005
Assembled workforce	7 years	5,678		(1,622		)	4,056
Patents	14 - 20	274		(20		)	254
Total		22,391		(9,076		)	13,315
Total intangible assets		$	57,616	$	(9,076	)	$	48,540

	December 31, 2017
	Useful Life (years)	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
	(In thousands)
Indefinite life intangible assets:
Trade names	Indefinite	$	21,195	$	—		$	21,195
Spectrum and licenses	Indefinite	14,030		—			14,030
Total		35,225		—			35,225
Definite life intangible assets:
Intellectual property	20 years	16,439		(6,651		)	9,788
Assembled workforce	7 years	5,678		(812		)	4,866
Patents	14 - 20	146		(6		)	140
Total		22,263		(7,469		)	14,794
Total intangible assets		$	57,488	$	(7,469	)	$	50,019

Schedule of finite-lived intangible assets, future amortization expense

Future amortization expense with respect to intangible assets existing at December 31, 2018, by year and in the aggregate, was as follows:

Year ending December 31,	Amount
	(In thousands)
2019	$	1,609
2020	1,609
2021	1,609
2022	1,609
2023	1,609
Thereafter	5,270
Total estimated future amortization expense	$	13,315

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of future minimum rental payments for operating leases

Future minimum lease payments, by year and in the aggregate, under noncancelable operating leases at December 31, 2018, are as follows:

Year ending December 31,	Operating Leases
	(In thousands)
2019	$	3,692
2020	3,734
2021	3,827
2022	3,402
2023	3,359
Thereafter	12,926
Total	$	30,940

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Debt (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Schedule of future payments of credit facility

Future minimum principal repayments with respect to the Company's debt balances existing at December 31, 2018 by year and in the aggregate, are as follows:

Year ending December 31,	Amount
	(In thousands)
2019	$	126,000
2020	216,000
2021	306,000
2022	666,000
2023	360,000
Thereafter	370,869
Total debt commitments	$	2,044,869
Less: Original issuance discount	89,132
Less: Total short-term debt	126,000
Total long-term debt, net	$	1,829,737

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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of share-based payment award, stock options, valuation assumptions

The following table summarizes weighted-average assumptions used in the Company's calculations of fair value:

	Year Ended December 31,
	2018	2017	2016
Expected volatility	39.53%	41.11%	41.36%
Expected term (years)	6.11	6.25	6.25
Expected dividends	—%	—%	—%
Risk free interest rate	2.68%	1.92%	1.68%

Schedule of Share-based compensation, stock options, activity

A summary of the activity of the Company’s stock options is as follows:

	Shares		Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
	(In thousands, except years and per share data)
Options outstanding at December 31, 2015	7,120		$	7.86
Granted	249		8.13
Cancelled or expired	(39	)	8.92
Exercised	(73	)	7.33
Forfeited	(55	)	7.62
Options outstanding at December 31, 2016	7,202		$	7.87	5.45	$	12,473
Granted	209		10.50
Cancelled or expired	(2	)	7.24
Exercised	(534	)	7.93
Forfeited	(19	)	9.13
Options outstanding at December 31, 2017	6,856		$	7.94	4.63	$	26,459
Granted	364		15.56
Cancelled or expired	(1	)	8.59
Exercised	(1,477	)	8.42
Forfeited	(39	)	9.97
Options outstanding at December 31, 2018	5,703		$	8.29	4.38	$	57,956
Options exercisable at December 31, 2018	5,095		$	7.72	3.87	$	54,694
Options exercisable and expected to vest at December 31, 2018	5,687		$	8.27	4.37	$	57,891

Schedule of share-based compensation, restricted stock units award activity

A summary of the Company’s activity for outstanding RSUs is as follows:

	RSUs		Weighted- Average Grant Date Fair Value Per RSU
	(In thousands)
Outstanding at December 31, 2015	1,944		$	7.76
Granted	2,297		$	7.09
Forfeited	(152	)	$	7.44
Released	(766	)	$	7.36
Outstanding at December 31, 2016	3,323		$	7.40
Granted	2,431		$	8.89
Forfeited	(203	)	$	8.42
Released	(2,003	)	$	7.16
Outstanding at December 31, 2017	3,548		$	8.50
Granted	1,632		$	11.87
Forfeited	(163	)	$	9.69
Released	(1,940	)	$	8.64
Outstanding at December 31, 2018	3,077		$	10.13
Vested and unreleased at December 31, 2018 (1)	617

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Revenue from Contracts with Customers Revenue (Tables)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue [Table Text Block]

The following table summarizes the Company’s services revenue:

	Year Ended December 31,
	2018		2017		2016
	(in thousands)
Commercial voice and data services	$	193,176	$	177,685	$	177,666
Commercial IoT data services	85,054		74,142		65,523
Hosted payload and other data services	40,527		9,908		3,633
Government services	88,000		88,000		88,000
Total services	$	406,757	$	349,735	$	334,822

Summary of Company's Engineering and Support Service Revenue [Table Text Block]

The following table summarizes the Company’s engineering and support services revenue:

	Year Ended December 31,
	2018		2017		2016
	(in thousands)
Commercial	$	716	$	3,109	$	2,245
Government	17,687		18,083		22,362
Total	$	18,403	$	21,192	$	24,607

Contract with Customer, Asset and Liability [Table Text Block]

The contract assets not separately disclosed are as follows:

	Year Ended December 31,
	2018		2017
	(in thousands)
Contract Assets:
Commissions	$	1,010	$	1,555
Other contract costs	$	3,631	$	3,753

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

The impact of the implementation of the new revenue standard on the Company's condensed consolidated balance sheets, as compared to accounting under prior revenue guidance (Accounting Standards Codification ("ASC") Topic 605), was as follows:

	December 31, 2018
	As reported		Adjustment			Pro forma under ASC 605
	(in thousands)
Prepaid expenses and other current assets	$	18,284	$	527		$	18,811
Deferred revenue	37,429		19,771			57,200
Deferred revenue, net of current portion	74,656		(2,782		)	71,874
Other long-term liabilities	4,160		(3,975		)	185
Retained earnings	$	501,712	$	(12,487	)	$	489,225

The impact of the implementation of the new standard on the Company's condensed consolidated statements of operations and comprehensive income (loss) was as follows:

	Year Ended December 31, 2018
	As reported			Adjustment			Pro forma under ASC 605
	(in thousands)
Service revenue	$	406,757		$	(1,304	)	$	405,453
Cost of services	86,016			(144		)	85,872
Loss before income taxes	(20,649		)	(1,160		)	(21,809		)
Income tax benefit	7,265			411			7,676
Net loss	$	(13,384	)	$	(749	)	$	(14,133	)

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of income before income tax, domestic and foreign

U.S. and foreign components of income before income taxes are presented below:

	Year Ended December 31,
	2018			2017			2016
				(In thousands)
U.S. income (loss)	$	(22,147	)	$	120,281		$	176,448
Foreign income (loss)	1,498			(709		)	1,717
Total income (loss) before income taxes	$	(20,649	)	$	119,572		$	178,165

Schedule of components of income tax expense (benefit)

The components of the Company’s income tax provision were as follows:

	Year Ended December 31,
	2018			2017			2016
				(In thousands)
Current taxes:
Federal tax expense	$	17		$	13		$	1,206
State tax expense	(91		)	422			978
Foreign tax expense	1,163			863			1,141
Total current tax expense	1,089			1,298			3,325
Deferred taxes:
Federal tax expense (benefit)	(9,159		)	(110,811		)	60,295
State tax expense (benefit)	904			(4,851		)	3,454
Foreign tax expense (benefit)	(99		)	80			59
Total deferred tax expense (benefit)	(8,354		)	(115,582		)	63,808
Total income tax expense (benefit)	$	(7,265	)	$	(114,284	)	$	67,133

Schedule of effective income tax rate reconciliation

A reconciliation of the U.S. federal statutory income tax expense to the Company’s effective income tax provision is below. Any amounts that do not have a meaningful impact on this reconciliation are not separately disclosed.

	Year Ended December 31,
	2018			2017			2016
				(In thousands)
Expected tax expense (benefit) at U.S. federal statutory tax rate	$	(4,336	)	$	41,850		$	62,309
State taxes, net of federal benefit	(3,361		)	5,133			9,757
State tax valuation allowance	10,651			582			(2,710		)
Deferred impact of state tax law changes and elections	(6,481		)	(10,217		)	(2,962		)
Tax Act - deferred tax effects	—			(150,903		)	—
Equity-based compensation	(3,807		)	(977		)	—
Limitation on executive compensation deduction	1,568			26			—
Other nondeductible items	298			110			596
Tax credits	(2,872		)	(528		)	(442		)
Foreign taxes and other adjustments	1,075			640			585
Total income tax expense (benefit)	$	(7,265	)	$	(114,284	)	$	67,133

Schedule of deferred tax assets and liabilities

The components of deferred tax assets and liabilities are as follows:

	December 31,
	2018			2017
	(In thousands)
Deferred tax assets
Long-term contracts	$	70,518		$	61,358
Federal, state and foreign net operating loss carryforwards and tax credits	277,678			107,566
Other	20,002			22,680
Total deferred tax assets	368,198			191,604
Valuation allowance	(14,174		)	(3,815		)
Net deferred tax assets	354,024			187,789
Deferred tax liabilities
Fixed assets, intangibles and research and development expenditures	(529,037		)	(403,545		)
Investment in joint venture	(57,686		)	(27,796		)
Other	(8,357		)	(2,276		)
Total deferred tax liabilities	(595,080		)	(433,617		)
Net deferred income tax liabilities	$	(241,056	)	$	(245,828	)

Summary of income tax contingencies

The following is a tabular reconciliation of the total amounts of unrecognized tax benefits which includes related interest and penalties:

	2018		2017
	(In thousands)
Balance at January 1,	$	1,046	$	920
Change attributable to tax positions taken in a prior period	50		146
Change attributable to final assessment	—		(27		)
Change attributable to tax positions taken in the current period	16		10
Decrease attributable to lapse of statute of limitations	—		(3		)
Balance at December 31,	$	1,112	$	1,046

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Net Income (Loss) Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Computations of basic and diluted net income per share

The computations of basic and diluted net income (loss) per share are set forth below:

	Year Ended December 31,
	2018			2017			2016
	(In thousands, except per share data)
Numerator:
Net income (loss) attributable to common stockholders (numerator for basic net income per share)	$	(23,533	)	$	218,420		$	95,596
Net (income) loss allocated to participating securities	—			(215		)	(123		)
Numerator for basic net income (loss) per share	(23,533		)	218,205			95,473
Dividends on Series A preferred stock, declared and undeclared	—			7,000			7,000
Dividends on Series B preferred stock, declared and undeclared	—			8,436			8,436
Numerator for diluted net income (loss) per share	$	(23,533	)	$	233,641		$	110,909
Denominator: Denominator for basic net income (loss) per share - weighted   average outstanding common shares	108,975			97,934			95,967
Dilutive effect of stock options	—			1,558			250
Dilutive effect of Performance RSUs	—			1,308			1,328
Dilutive effect of Series A preferred stock	—			10,602			10,602
Dilutive effect of Series B preferred stock	—			16,728			16,728
Denominator for diluted net income (loss) per share	108,975			128,130			124,875
Net income (loss) per share attributable to common stockholders - basic	$	(0.22	)	$	2.23		$	1.00
Net income (loss) per share attributable to common stockholders - diluted	$	(0.22	)	$	1.82		$	0.89

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Segments, Significant Customers, Supplier and Service Providers and Geographic Information (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Schedule of long lived assets by geographical areas

Net property and equipment by geographic area was as follows:

	December 31,
	2018		2017
	(In thousands)
United States	$	188,203	$	165,337
Satellites in orbit	2,504,734		926,090
Iridium NEXT systems under construction (United States)	658,395		2,088,380
All others (1)	19,523		30,355
Total	$	3,370,855	$	3,210,162

⁽¹⁾  No single country in this group represented more than10% of property and equipment, net.

Revenue from external customers by geographic areas

Revenue by geographic area was as follows:

	Year Ended December 31,
	2018		2017		2016
			(In thousands)
United States	$	276,398	$	229,741	$	226,190
Canada	48,511		44,107		42,373
United Kingdom	51,344		46,245		47,135
Other countries (1)	146,755		127,953		117,942
Total	$	523,008	$	448,046	$	433,640

⁽¹⁾  No single country in this group represented more than10% of revenue.

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Selected Quarterly Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule of quarterly financial information (unaudited)

The following represents the Company’s unaudited quarterly results:

	Quarter Ended
	March 31, 2018		June 30, 2018			September 30, 2018			December 31, 2018
	(In thousands, except per share data)
Revenue	$	119,148	$	134,931		$	136,764		$	132,165
Operating income (loss)	$	19,439	$	16,345		$	6,011		$	(142	)
Net income (loss)	$	11,472	$	(4,418	)	$	(12,856	)	$	(7,582	)
Net income (loss) per common share - basic	$	0.08	$	(0.06	)	$	(0.13	)	$	(0.09	)
Net income (loss) per common share - diluted	$	0.07	$	(0.06	)	$	(0.13	)	$	(0.09	)

	Quarter Ended
	March 31, 2017		June 30, 2017		September 30, 2017		December 31, 2017
	(In thousands, except per share data)
Revenue	$	104,426	$	111,604	$	116,547	$	115,469
Operating income (loss) (1)	$	55,602	$	35,742	$	38,082	$	(13,950	)
Net income (2)	$	37,948	$	24,778	$	29,253	$	141,877
Net income per common share - basic	$	0.35	$	0.21	$	0.26	$	1.40
Net income per common share - diluted	$	0.30	$	0.20	$	0.23	$	1.10

⁽¹⁾  Includes accelerated depreciation of$36.8 million in the fourth quarter of 2017 associated with the write-off of the full amount previously paid to Kosmotras which decreased operating income. Also includes the impact of$14.2 million related to the gain on the transaction with Boeing, effective January 3, 2017.

⁽²⁾ Includes the provisional estimated impact of the Tax Act enacted in December 2017 on the Company's deferred tax assets and liabilities. Immaterial adjustments to these provisional amounts were made in 2018.

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Significant Accounting Policies and Basis of Presentation - Narrative (Details) - USD ($)		3 Months Ended	12 Months Ended
	Jan. 01, 2019	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2019	Jan. 01, 2018	Jun. 30, 2011
Accounting Policies [Line Items]
Reduction of deferred revenue		$ (38,390,000)	$ (37,429,000)	$ (38,390,000)
Line of credit facility, maximum borrowing capacity			1,800,000,000
Realized gains or losses on the sale of marketable securities			0	0
Deferred financing costs			80,100,000
Interest Costs Capitalized			76,700,000	114,400,000	$ 106,400,000
Provision for obsolete inventory			343,000	361,000	1,053,000
Depreciation			216,600,000	120,700,000	48,600,000
Goodwill		0		0
Advertising expense			$ 400,000	300,000	$ 500,000
Next-generation Satellites
Accounting Policies [Line Items]
Property, plant and equipment, useful life			12 years 6 months
Accounting Standards Update 2016-02 [Member]
Accounting Policies [Line Items]
ASC 842 Transition Impact to Right of Use Asset and Liability	$ 30,400,000
Kosmotras
Accounting Policies [Line Items]
Purchase obligation amount for single launch								$ 51,800,000
Kosmotras
Accounting Policies [Line Items]
Depreciation		36,800,000
Scenario, Forecast [Member]
Accounting Policies [Line Items]
US government contract, minimum payments receivable per year						$ 88,000,000
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Accounting Policies [Line Items]
Reduction of deferred revenue			$ (19,771,000)				$ (15,700,000)
Revolving Credit Facility [Member]
Accounting Policies [Line Items]
Deferred financing costs		97,200,000	80,100,000	97,200,000
Senior Notes [Member]
Accounting Policies [Line Items]
Deferred financing costs		$ 0	$ 9,000,000	$ 0

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Significant Accounting Policies and Basis of Presentation - Classification of Stock-based Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Property and equipment, net	$ 1,865	$ 2,326
Inventory	234	280
Share-Based Compensation, Prepaid and Other Assets	138	132
Cost of subscriber equipment	26	30
Cost of services (exclusive of depreciation and amortization)	3,600	4,366
Research and development	340	349
Selling, general and administrative	10,524	11,211
Total stock-based compensation	$ 16,727	$ 18,694

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Significant Accounting Policies and Basis of Presentation - Schedule of Property and Equipment Useful Lives (Details)	12 Months Ended
	Dec. 31, 2018
First-generation satellites | Minimum
Property, plant and equipment, useful life	15 years
First-generation satellites | Maximum
Property, plant and equipment, useful life	21 years
Next-generation satellites
Property, plant and equipment, useful life	12 years 6 months
Ground system | Minimum
Property, plant and equipment, useful life	5 years
Ground system | Maximum
Property, plant and equipment, useful life	7 years
Equipment | Minimum
Property, plant and equipment, useful life	3 years
Equipment | Maximum
Property, plant and equipment, useful life	5 years
Internally developed software and purchased software | Minimum
Property, plant and equipment, useful life	3 years
Internally developed software and purchased software | Maximum
Property, plant and equipment, useful life	7 years
Building
Property, plant and equipment, useful life	39 years
Building improvements | Minimum
Property, plant and equipment, useful life	5 years
Building improvements | Maximum
Property, plant and equipment, useful life	39 years

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Significant Accounting Policies and Basis of Presentation - Finite Lived Intangible Assets Useful Lives (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Intellectual property
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible asset	20 years	20 years
Assembled workforce
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible asset	7 years	7 years
Minimum | Patents
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible asset	14 years	14 years
Maximum | Patents
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible asset	20 years	20 years

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- Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Line Items]
Cash	$ 20,879	$ 24,092
Total cash and cash equivalents	273,352	285,873
Restricted cash and cash equivalents	191,935	102,384
Fair Value, Inputs, Level 2
Cash and Cash Equivalents [Line Items]
Money market funds	252,473	251,950
Commercial paper	$ 0	$ 9,831

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Cash and Cash Equivalents and Marketable Securities - Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Line Items]
Mature within one year - Fair value		$ 11,500
Total - Fair Value - Marketable Securities	$ 0	11,800
Available For Sale Securities Debt Maturities After One Through Three Years Fair Value		$ 300

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Property and Equipment - Summary of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Satellite system	$ 2,766,627	$ 1,199,794
Ground system	60,656	67,576
Equipment	42,152	35,616
Internally developed software and purchased software	215,252	191,089
Building and leasehold improvements	30,517	32,130
Property and equipment gross excluding construction in process and land	3,115,204	1,526,205
Less: accumulated depreciation	(453,463)	(432,833)
Property and equipment net excluding construction in process and land	2,661,741	1,093,372
Land	8,037	8,037
Construction in process:
Iridium NEXT systems under construction	658,395	2,088,380
Total other construction-in-process	42,682	20,373
Total property and equipment, net of accumulated depreciation	$ 3,370,855	$ 3,210,162

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Property and Equipment - Construction in Process (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Internally developed software	$ 27,725	$ 14,782
Equipment	12,841	4,241
Ground system	2,116	1,350
Total other construction-in-process	$ 42,682	$ 20,373

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Property and Equipment - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Depreciation		$ 216.6	$ 120.7	$ 48.6
Kosmotras
Property, Plant and Equipment [Line Items]
Depreciation	$ 36.8

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Intangible Assets - Indentifiable Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Indefinite life intangible assets:
Net Carrying Value	$ 35,225	$ 35,225
Definite life intangible assets:
Gross Carrying Value	22,391	22,263
Accumulated Amortization	(9,076)	(7,469)
Net Carrying Value	13,315	14,794
Gross Carrying Value	57,616	57,488
Accumulated Amortization	(9,076)	(7,469)
Total intangible assets, Net Carrying Value	$ 48,540	$ 50,019
Intellectual Property
Definite life intangible assets:
Useful Life (years)	20 years	20 years
Gross Carrying Value	$ 16,439	$ 16,439
Accumulated Amortization	(7,434)	(6,651)
Net Carrying Value	$ 9,005	$ 9,788
Assembled workforce
Definite life intangible assets:
Useful Life (years)	7 years	7 years
Gross Carrying Value	$ 5,678	$ 5,678
Accumulated Amortization	(1,622)	(812)
Net Carrying Value	4,056	4,866
Patents
Definite life intangible assets:
Gross Carrying Value	274	146
Accumulated Amortization	(20)	(6)
Net Carrying Value	254	140
Trade names
Indefinite life intangible assets:
Net Carrying Value	21,195	21,195
Spectrum and licensing
Indefinite life intangible assets:
Net Carrying Value	$ 14,030	$ 14,030
Minimum | Patents
Definite life intangible assets:
Useful Life (years)	14 years	14 years
Maximum | Patents
Definite life intangible assets:
Useful Life (years)	20 years	20 years

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Intangible Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 1.6	$ 1.6	$ 0.8

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Intangible Assets - Future Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
2019	$ 1,609
2020	1,609
2021	1,609
2022	1,609
2023	1,609
Thereafter	5,270
Net Carrying Value	$ 13,315	$ 14,794

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Commitments and Contingencies - Narrative (Details)		1 Months Ended			3 Months Ended	12 Months Ended
	Mar. 21, 2018 USD ($)	Nov. 30, 2016 USD ($) Satellite	Jun. 30, 2010 USD ($)	Mar. 31, 2010 USD ($) Launch	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) Satellite	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jul. 26, 2017 USD ($)	Jun. 30, 2011 USD ($)
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Debt Instrument, Milestone Payment						$ (59,936,000)	$ 0	$ 0
Minimum Required Cash Reserve Balance For Credit Facility						25,000,000
Gain (Loss) on Extinguishment of Debt						7,292,000	0	0
Depreciation						216,600,000	120,700,000	48,600,000
Recorded unconditional purchase obligation						39,100,000
Purchase obligation						$ 13,900,000
Lease extended period						through 2030
Operating leases, rent expense						$ 3,300,000	3,200,000	$ 3,100,000
Open Purchase Orders with Other Vendors						$ 7,200,000
Minimum
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Operating lease agreements renewal term						1 year
Maximum
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Operating lease agreements renewal term						10 years
Section A
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Insurance policy liability limit per occurrence						$ 1,000,000,000
Section B
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Insurance policy liability limit per occurrence						500,000,000
Insurance policy liability limit aggregate						1,000,000,000
Deductible for claims						250,000
Section C
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Insurance policy liability limit per occurrence						500,000,000
Insurance policy liability limit aggregate						1,000,000,000
Deductible for claims						250,000
Eighth launch with spaceX
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Number of satellites to launch | Satellite		5
Unconditional purchase obligations
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Other inventory, materials, supplies and merchandise under consignment, gross					$ 4,000,000	2,500,000	$ 4,000,000
Space vehicle | Section B
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Insurance policy liability limit aggregate						500,000,000
Thales Alenia Space France [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Commitments price for design and build of satellites			$ 2,300,000,000
Contract aggregate payment						2,200,000,000
Borrowings under credit facility						1,500,000,000
Space exploration technologies corp
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Contract aggregate payment						$ 498,900,000
Space exploration technologies corp | One to seven launch with spaceX
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Number of launches for agreement | Launch				7
Maximum commitments amount				$ 448,900,000
Space exploration technologies corp | SpaceX falcon 9 rocket
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Number of satellites carried to orbit for each of initial seven launches | Satellite						10
Space exploration technologies corp | Eighth launch with spaceX
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Commitments price for launching of satellites		$ 61,900,000
Space exploration technologies corp | GFZ german research centre for geosciences | Eighth launch with spaceX
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Payment due from related party to share the launch services		$ 29,800,000
Space exploration technologies corp | GFZ german research centre for geosciences | Gravity recovery and climate experiment follow-on satellites
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Number of satellites to launch | Satellite		2
Kosmotras
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase obligation amount for single launch										$ 51,800,000
Iridium next launch and in-orbit insurance
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Insurance coverage period						12 months
Insurance policy premium						$ 120,700,000
Bills Of Exchange [Member] | Thales Alenia Space France [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Debt Instrument, Face Amount									$ 100,000,000
Debt Instrument, Milestone Payment	$ 59,900,000
Forecasted Milestone Payments Financed by Senior Notes	44,400,000
Gain (Loss) on Extinguishment of Debt						$ 4,000,000
Line of Credit [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Minimum Required Cash Reserve Balance For Credit Facility	189,000,000
Debt Issuance Costs, Net	$ 10,300,000
Kosmotras
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Depreciation					$ 36,800,000

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Commitments and Contingencies - Future Minimum Lease Payments (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Year ending December 31,
2019	$ 3,692
2020	3,734
2021	3,827
2022	3,402
2023	3,359
Thereafter	12,926
Total	$ 30,940

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Debt Narrative (Details) $ in Thousands			12 Months Ended					24 Months Ended	36 Months Ended
	Mar. 21, 2018 USD ($)	Oct. 04, 2010	Dec. 31, 2024	Dec. 31, 2021	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2020	Dec. 31, 2024	Dec. 31, 2023 USD ($)
Line of Credit Facility [Line Items]
Interest Costs Incurred					$ 142,700	$ 114,400	$ 106,400
Percentage of company obligations insured					95.00%
Line of credit facility, maximum borrowing capacity					$ 1,800,000
Minimum required cash reserve balance for credit facility					25,000
Restricted cash and cash equivalents					191,935	102,384
Proceeds from lines of credit					0	22,207	$ 251,498
Interest payable					$ 29,400	$ 15,000
Effective interest rate					6.60%	6.60%	6.60%
Minimum Required Cash Reserve to be Held in Debt Service Reserve Account					$ 189,000
Maximum debt to equity ratio		0.7
Debt service coverage ratio		66.67%
Leverage decline ratio					824.00%
Available cash balance as defined under line of credit					$ 273,400
Debt to equity ratio					0.53
Debt Instrument, Debt Service Coverage Ratio					3.4
Debt Instrument, Leverage Ratio					5.9
Available cure balance					$ 62,500
Credit Facility Carrying Amount					1,684,900
Debt Issuance Costs, Noncurrent, Net					80,100
Long-term Line of Credit					1,604,800
Gain (Loss) on Extinguishment of Debt					7,292	$ 0	$ 0
Interest Costs Capitalized					76,700	114,400	$ 106,400
Scenario, Forecast [Member]
Line of Credit Facility [Line Items]
Credit Facility, Debt Service Coverage Ratio Requirements by Period				1.25				1.5	1.5
Leverage decline ratio			200.00%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Issuance Costs, Noncurrent, Net					$ 80,100	97,200
Syndicate Of Bank Lenders Credit Facility | Scenario, Forecast [Member] | Maximum | Aireon LLC
Line of Credit Facility [Line Items]
Hosting fees required										$ 200,000
Series B preferred stock
Line of Credit Facility [Line Items]
Preferred stock, dividend rate, percentage					6.75%
Senior Notes [Member]
Line of Credit Facility [Line Items]
Debt instrument, interest rate, stated percentage	10.25%
Debt Issuance Costs, Noncurrent, Net					$ 9,000	$ 0
Debt Instrument, Face Amount	$ 360,000				360,000
Senior Unsecured Notes - Fair Market Value					389,700
Debt Issuance Costs, Net					9,000
Line of Credit [Member]
Line of Credit Facility [Line Items]
Percentage of Proceeds Payable to Credit Facility Upon Redemption of Related Party Equity Interest		100.00%
Minimum required cash reserve balance for credit facility	189,000
Delayed contributions to cash reserve account for debt repayment	87,000
Restricted cash	$ 75,000
Debt Instrument, Period of Credit Facility Maturity Acceleration	6 months
Debt Issuance Costs, Net	$ 10,300
Line of Credit Facility, Periodic Payment, Principal					43,100
Line of Credit [Member] | Aireon LLC
Line of Credit Facility [Line Items]
Hosting Fees Required to be Used for Repayment of Credit Facility if Certain Terms Are Met	200,000
Cash and Cash Equivalents Balance Required for Company for Repayment of Credit Facility with Hosting Fees	$ 140,000
Percent of Excess Cash Received from Hosting Fees Required to be Used to Pay Credit Facility	50.00%
Gain (Loss) on Extinguishment of Debt					$ 3,300

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Debt Future Payments (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
2019	$ 126,000
2020	216,000
2021	306,000
2022	666,000
2023	360,000
Thereafter	370,869
Total	2,044,869
Original issuance discount	89,132
Total short-term debt	126,000
Original issuance discount	$ 1,829,737

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Debt Senior Unsecured Notes (Details) - USD ($) $ in Thousands		12 Months Ended
	Mar. 21, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jul. 26, 2017
Debt Instrument [Line Items]
Total Debt - Amortization of Deferred Financing Costs		$ 26,500	$ 27,300	$ 28,700
Debt Instrument, Milestone Payment		(59,936)	0	$ 0
Senior Notes, Noncurrent		350,998	$ 0
Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	10.25%
Senior Unsecured Notes - Fair Market Value		389,700
Debt Issuance Costs, Net		9,000
Debt Instrument, Face Amount	$ 360,000	$ 360,000
Line of Credit [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Net	10,300
Use of Notes Offering Proceeds to Fund Debt Service Reserve Account	189,000
Thales Alenia Space France [Member] | Bills Of Exchange [Member]
Debt Instrument [Line Items]
Debt Instrument, Milestone Payment	59,900
Forecasted Milestone Payments Financed by Senior Notes	$ 44,400
Debt Instrument, Face Amount					$ 100,000

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Boeing Operations and Maintenance (O&M) Agreements Narrative (Details) - USD ($) $ in Thousands		1 Months Ended		12 Months Ended
	Nov. 28, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 03, 2017
Boeing Operations And Maintenance Agreements [Line Items]
Satellite operations and maintenance costs				$ 28,100	$ 30,500	$ 29,000
Gain from derecognition of purchase accounting liability				$ 0	$ 14,189	$ 0
Insourcing agreement | Boeing
Boeing Operations And Maintenance Agreements [Line Items]
Obligation costs associated with hiring of employees	$ 5,500
Development services agreement | Boeing
Boeing Operations And Maintenance Agreements [Line Items]
Annual commitment amount							$ 6,000
Boeing | Insourcing agreement
Boeing Operations And Maintenance Agreements [Line Items]
Agreed Costs Paid Associated With Hiring of Employees		$ 2,750	$ 2,750

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Stock-Based Compensation Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended			12 Months Ended
	May 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized under plan	5,199,239
Total number of shares authorized under plan	28,402,248
Number of shares available for future grant					8,569,642
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent	100.00%
Share-Based Compensation Award, Reduction in Shares Available for Issuance by Shares Issued Pursuant to Any Stock Award that is not an Appreciation Award	1.8
Share-based compensation arrangement by share-based payment award, options, grants in period, gross					364,000	209,000	249,000
Allocated share-based compensation expense					$ 1.5	$ 1.8	$ 2.5
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value					$ 6.63	$ 4.51	$ 3.47
Share-based compensation arrangement by share-based payment award, options, vested in period, fair value					$ 1.4	$ 2.0	$ 2.9
Performance RSUs expected to vest (in shares)					5,687,000
Restricted Stock or Unit Expense					$ 15.2	$ 17.0	$ 13.5
Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, total					$ 9.5
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition					1 year 3 months 27 days
Employee stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, total					$ 2.9
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition					2 years 8 months 8 days
Service based R S U
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, restricted stock units					900,000	964,000	573,000
Fair value of restricted stock units					$ 10.7	$ 8.5	$ 4.0
Employee | Restricted stock units (RSUs) | Percent vested after first year of service
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Quarterly vesting percentage after first year anniversary					25.00%
Employee | Restricted stock units (RSUs) | Percent vesting quarterly after first year of service
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Quarterly vesting percentage after first year anniversary					6.25%
Employee | Employee stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, terms of award					ten years
Share-based compensation vesting period					4 years
Share-based compensation arrangement by share-based payment award, options, grants in period, gross					364,000	209,000	249,000
Grant date fair value of stock options					$ 2.4	$ 0.9	$ 0.9
Employee | Employee stock option | Percent vested after first year of service
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Quarterly vesting percentage after first year anniversary					25.00%
Employee | Employee stock option | Percent vesting quarterly after first year of service
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Quarterly vesting percentage after first year anniversary					6.25%
Non employee consultants | Restricted stock units (RSUs) | Percent vesting quarterly after first year of service
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Quarterly vesting percentage after first year anniversary					12.50%
Non employee consultants | Service based R S U
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, restricted stock units					14,000	8,000	35,000
Fair value of restricted stock units					$ 0.2	$ 0.1	$ 0.3
Non employee consultants | Service based R S U | Vesting on the First Anniversary of Grant Date [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage					50.00%
Executives and Employees | Performance Based Bonus R S U
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, restricted stock units		474,000	1,190,000	1,335,000
Fair value of restricted stock units		$ 5.6	$ 10.5	$ 9.4
Employee Executives | Performance Based Bonus R S U
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, restricted stock units					134,000	173,000	119,000
Fair value of restricted stock units					$ 1.6	$ 1.5	$ 0.8
Employee Executives | Performance Shares | Vesting in march in year after performance period end
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage					50.00%
Employee Executives | Performance Shares | Vesting in march of third year after grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage					50.00%
Employee Executives | Performance Shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage					0.00%
Employee Executives | Performance Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage					150.00%
Board of directors chairman | Service based R S U
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, restricted stock units					110,000	96,000	126,000
Fair value of restricted stock units					$ 1.3	$ 1.0	$ 1.0

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Stock-Based Compensation Fair Value Of Options Granted (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate	39.53%	41.11%	41.36%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	2.68%	1.92%	1.68%
Expected term (years)	6 years 1 month 10 days	6 years 3 months	6 years 3 months
Expected dividends	0.00%	0.00%	0.00%

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Stock-Based Compensation Activity Of Company's Stock Options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding
Options outstanding, beginning of period (in shares)	6,856	7,202	7,120
Options Granted - Shares	364	209	249
Options Cancelled or expired - Shares	(1)	(2)	(39)
Options Exercised - Shares	(1,477)	(534)	(73)
Options Forfeited - Shares	(39)	(19)	(55)
Options outstanding, end of period (in shares)	5,703	6,856	7,202
Options exercisable, end of period (in shares)	5,095
Options exercisable and expected to vest, end of period (in shares)	5,687
Weighted-Average Exercise Price
Options outstanding, beginning of period - weighted average exercise price per share	$ 7.94	$ 7.87	$ 7.86
Options granted - weighted average exercise price per share	15.56	10.50	8.13
Options cancelled or expired - weighted average exercise price per share	8.59	7.24	8.92
Options exercised - weighted average exercise price per share	8.42	7.93	7.33
Options forfeited - weighted average exercise price per share	9.97	9.13	7.62
Options outstanding, end of period - weighted average exercise price per share	8.29	$ 7.94	$ 7.87
Options exercisable, end of period - weighted average exercise price per share	7.72
Options exercisable and expected to vest, end of period- weighted average exercise price per share	$ 8.27
Options outstanding, end of period - weighted average remaining contractual term (years)	4 years 4 months 17 days	4 years 7 months 17 days	5 years 5 months 12 days
Options exercisable, end of period - weighted average remaining contractual term (years)	3 years 10 months 13 days
Options exercisable and expected to vest, end of period - Weighted Average Remaining Contractual Term (Years)	4 years 4 months 13 days
Aggregate Intrinsic Value
Options outstanding, end of period - aggregate intrinsic value	$ 57,956	$ 26,459	$ 12,473
Options exercisable, end of period - aggregate intrinsic value	54,694
Options exercisable and expected to vest, end of period - aggregate intrinsic value	$ 57,891

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Stock-Based Compensation Outstanding RSUs (Details) - Outstanding Restricted Stock Units - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
RSUs
Outstanding - restricted stock units	3,548	3,323	1,944
Granted - restricted stock units	1,632	2,431	2,297
Forfeited - restricted stock units	(163)	(203)	(152)
Released - restricted stock units	(1,940)	(2,003)	(766)
Outstanding - restricted stock units	3,077	3,548	3,323
Vested - restricted stock units	617
Weighted-Average Exercise Price
Outstanding - weighted average grant date fair value per RSU	$ 8.50	$ 7.40	$ 7.76
Granted - weighted average grant date fair value per RSU	11.87	8.89	7.09
Forfeited - weighted average grant date fair value per RSU	9.69	8.42	7.44
Released - weighted average grant date fair value per RSU	8.64	7.16	7.36
Outstanding - weighted average grant date fair value per RSU	$ 10.13	$ 8.50	$ 7.40

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Preferred Stock Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended			12 Months Ended
	May 15, 2019	May 31, 2014	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2012	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Deferral period on preferred stock dividends			1 year 3 months
Preferred stock, shares authorized						2,000,000
Preferred stock, par value						$ 0.0001
Preferred stock, shares issued		500,000			1,000,000
Shares of preferred stock, undesignated and unissued						500,000
Common stock
Class of Stock [Line Items]
Stock Issued During Period, Shares, Conversion of Convertible Securities						10,702,000
Series A preferred stock
Class of Stock [Line Items]
Preferred stock, par value						$ 0.0001	$ 0.0001
Preferred stock, shares issued						1,000,000	1,000,000
Preferred stock dividends declared and paid income statement impact						$ 1,750	$ 1,750	$ 7,000
Preferred Stock, Shares Outstanding						0	1,000,000
Series A preferred stock | Private offering
Class of Stock [Line Items]
Preferred stock, shares issued					1,000,000
Annual rate of preferred stock, per share				$ 12.26
Stock Issued During Period, Shares, Conversion of Convertible Securities				10,599,974
Preferred stock dividends declared and paid income statement impact						$ 7,000	$ 1,800
Series A cumulative convertible perpetual preferred stock | Private offering
Class of Stock [Line Items]
Dividend rate on preferred stock					7.00%
Series B preferred stock
Class of Stock [Line Items]
Preferred stock, par value						$ 0.0001	$ 0.0001
Preferred stock, shares issued						500,000	500,000
Dividend rate on preferred stock						6.75%
Preferred stock dividends declared and paid income statement impact						$ 2,109	$ 2,109	$ 8,436
Preferred Stock, Shares Outstanding						497,000	500,000
Series B preferred stock | Public Offering [Member]
Class of Stock [Line Items]
Preferred stock, shares issued		500,000
Price Per Share Of Preferred Stock		$ 250
Series B preferred stock | Private offering
Class of Stock [Line Items]
Aggregate discount and offering costs		$ 400
Proceeds from sale of preferred stock		$ 120,800
Preferred stock, purchase price per share		$ 242.50
Underwriting discount price per share		$ 7.50
Payment of underwriter discount		$ 3,800
Series B preferred stock | Public Offering [Member]
Class of Stock [Line Items]
Preferred stock, liquidation preference per share						$ 250
Annual rate of preferred stock, per share						$ 16.875
Convertible Preferred Stock, Shares Issued upon Conversion						33.456
Initial conversion price of common stock						$ 7.47
Preferred stock dividends declared and paid income statement impact						$ 8,400	$ 2,100
Series B cumulative convertible perpetual preferred stock | Private offering
Class of Stock [Line Items]
Preferred stock, liquidation preference per share						$ 250
Scenario, Forecast [Member] | Series B preferred stock | Private offering
Class of Stock [Line Items]
Annual rate of preferred stock, per share	$ 11.21

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Revenue from Contracts with Customers Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Prepaid expenses and other current assets	$ 18,284				$ 25,347				$ 18,284	$ 25,347
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest									(20,649)	119,572	$ 178,165
Income Tax Expense (Benefit)									7,265	114,284	(67,133)
Deferred revenue	37,429				38,390				37,429	38,390
Deferred revenue, net of current portion	74,656				47,612				74,656	47,612
Other long-term liabilities	4,160				59,519				4,160	59,519
Contract with Customer, Liability, Revenue Recognized									18,000	22,700
Net income (loss)	(7,582)	$ (12,856)	$ (4,418)	$ 11,472	141,877	$ 29,253	$ 24,778	$ 37,948	(13,384)	233,856	111,032
Retained Earnings (Accumulated Deficit)	501,712				$ 518,794				501,712	518,794
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Prepaid expenses and other current assets	18,811								18,811
Deferred revenue	57,200								57,200
Deferred revenue, net of current portion	71,874								71,874
Other long-term liabilities	185								185
Retained Earnings (Accumulated Deficit)	489,225								489,225
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue from Contract with Customer, Excluding Assessed Tax									405,453
Cost of Goods and Services Sold									85,872
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest									(21,809)
Income Tax Expense (Benefit)									7,676
Net income (loss)									(14,133)
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Prepaid expenses and other current assets	527								527
Revenue from Contract with Customer, Excluding Assessed Tax									(1,304)
Cost of Goods and Services Sold									(144)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest									(1,160)
Income Tax Expense (Benefit)									411
Deferred revenue	19,771								19,771			$ 15,700
Deferred revenue, net of current portion	(2,782)								(2,782)
Other long-term liabilities	(3,975)								(3,975)
Net income (loss)									(749)
Retained Earnings (Accumulated Deficit)	$ (12,487)								(12,487)
Engineering and Support Services [Member]
Revenue from Contract with Customer, Excluding Assessed Tax									18,403	21,192	24,607
Commercial Voice and Data Services [Member]
Revenue from Contract with Customer, Excluding Assessed Tax									193,176	177,685	177,666
Commercial IoT Data Services [Member]
Revenue from Contract with Customer, Excluding Assessed Tax									85,054	74,142	65,523
Hosted Payload and Other Data Services [Member]
Revenue from Contract with Customer, Excluding Assessed Tax									40,527	9,908	3,633
Government Services [Member]
Revenue from Contract with Customer, Excluding Assessed Tax									88,000	88,000	88,000
Service [Member]
Revenue from Contract with Customer, Excluding Assessed Tax									406,757	349,735	334,822
Cost of Goods and Services Sold									86,016
Government [Member] | Engineering and Support Services [Member]
Revenue from Contract with Customer, Excluding Assessed Tax									17,687	18,083	22,362
Commercial [Member] | Engineering and Support Services [Member]
Revenue from Contract with Customer, Excluding Assessed Tax									716	3,109	$ 2,245
Commissions [Member]
Contract Assets Not Separately Disclosed									1,010	1,555
Other Contract Costs [Member]
Contract Assets Not Separately Disclosed									$ 3,631	$ 3,753

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Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	35.00%
Tax cuts and jobs act of 2017, change in tax rate, provisional income tax benefit	$ 150,400		$ 150,900
Tax cuts and jobs act of 2017, provisional undistributed accumulated earnings of foreign subsidiary			2,300
Tax cuts and jobs of 2017, transition tax for accumulated foreign earnings, income tax expense		$ 800	800
Deferred income tax assets, net	400	400
Deferred income tax liabilities, net	241,400	241,400
Deferred impact of state tax law changes and elections		(6,481)	(10,217)	$ (2,962)
Deferred tax assets, in process research and development	8,400	8,400	6,100
Deferred tax assets, tax credit carryforwards, foreign	5,200	5,200	4,700
Deferred tax assets, tax credit carryforwards, alternative minimum tax	3,600	3,600	3,800
Foreign tax credit carry forward valuation allowance increase	1,100	1,100
Unrecognized tax benefits, period increase (decrease)		1,100	1,000
Tax Cuts and Jobs Act of 2017, Finalized Accounting, Provisional Accumulated Earnings of Foreign Subsidiary	3,200	3,200
Tax Adjustments, Settlements, and Unusual Provisions		$ 7,000
Minimum
Income Taxes [Line Items]
Operating Loss Carryforward Expiration Date		2025
Operating loss carryforward expiration dates		2031
Research and development tax credit expiration date		2029
Foreign tax credit carryforward expiration dates		2020
Maximum
Income Taxes [Line Items]
Operating Loss Carryforward Expiration Date		2038
Operating loss carryforward expiration dates		2037
Research and development tax credit expiration date		2038
Foreign tax credit carryforward expiration dates		2028
ARIZONA
Income Taxes [Line Items]
Income tax reconciliation - Arizona tax law change		$ 13,500	10,200	$ 3,000
Domestic tax authority
Income Taxes [Line Items]
Operating loss carryforwards	219,600	$ 219,600	80,500
Domestic tax authority | Minimum
Income Taxes [Line Items]
Income tax examination, year under examination		2010
Domestic tax authority | Maximum
Income Taxes [Line Items]
Income tax examination, year under examination		2017
Foreign tax authority
Income Taxes [Line Items]
Operating loss carryforwards	36,700	$ 36,700	10,900
Foreign tax authority | Minimum
Income Taxes [Line Items]
Income tax examination, year under examination		2011
Foreign tax authority | Maximum
Income Taxes [Line Items]
Income tax examination, year under examination		2017
Valuation Allowance, Operating Loss Carryforwards | State and Local Jurisdiction
Income Taxes [Line Items]
Valuation allowance, deferred tax asset, increase (decrease), amount		$ (11,400)	(700)
Tax Year 2022 and Later | Foreign tax authority
Income Taxes [Line Items]
Operating loss carryforwards	$ 900	$ 900	$ 1,300
Source of Repatriated Foreign Earnings
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent		15.50%
Net Current Assets [Domain]
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent		8.00%

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Income Taxes - U.S and Foreign Components Of Income Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S. income (loss)	$ (22,147)	$ 120,281	$ 176,448
Foreign income (loss)	1,498	(709)	1,717
Total income (loss) before income taxes	$ (20,649)	$ 119,572	$ 178,165

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Income Taxes - Components of Company's Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current taxes:
Federal tax expense	$ 17	$ 13	$ 1,206
State tax expense	(91)	422	978
Foreign tax expense	1,163	863	1,141
Total current tax expense	1,089	1,298	3,325
Deferred taxes:
Federal tax expense (benefit)	(9,159)	(110,811)	60,295
State tax expense (benefit)	904	(4,851)	3,454
Foreign tax expense (benefit)	(99)	80	59
Total deferred tax expense (benefit)	(8,354)	(115,582)	63,808
Income Tax Expense (Benefit)	$ (7,265)	$ (114,284)	$ 67,133

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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Expected tax expense (benefit) at U.S. federal statutory tax rate	$ (4,336)	$ 41,850	$ 62,309
State taxes, net of federal benefit	(3,361)	5,133	9,757
State tax valuation allowance	10,651	582	(2,710)
Deferred impact of state tax law changes and elections	(6,481)	(10,217)	(2,962)
Tax Act - deferred tax effects	0	(150,903)	0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount	(3,807)	(977)	0
Effective Income Tax Rate Reconciliation, Limitation on Executive Compensation	1,568	26	0
Other nondeductible items	298	110	596
Tax credits	(2,872)	(528)	(442)
Foreign taxes and other adjustments	1,075	640	585
Income Tax Expense (Benefit)	$ (7,265)	$ (114,284)	$ 67,133

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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets
Long-term contracts	$ 70,518	$ 61,358
Federal, state and foreign net operating loss carryforwards and tax credits	277,678	107,566
Other	20,002	22,680
Total deferred tax assets	368,198	191,604
Valuation allowance	(14,174)	(3,815)
Net deferred tax assets	354,024	187,789
Deferred tax liabilities
Fixed assets, intangibles and research and development expenditures	(529,037)	(403,545)
Investment in joint venture	(57,686)	(27,796)
Other	(8,357)	(2,276)
Total deferred tax liabilities	(595,080)	(433,617)
Net deferred income tax liabilities	$ (241,056)	$ (245,828)

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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1,	$ 1,046	$ 920
Change attributable to tax positions taken in a prior period	50	146
Change attributable to final assessment	0	(27)
Change attributable to tax positions taken in the current period	16	10
Decrease attributable to lapse of statute of limitations	0	(3)
Balance at December 31,	$ 1,112	$ 1,046

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Net Income (Loss) Per Share - Narrative (Details) - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Employee stock option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted earnings per share	0.1		3.2
Unvested non-performance restricted stock units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted earnings per share		2.1	1.4
Unvested Performance Based Restricted Stock Units R S U [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted earnings per share	0.7	0.2
Series A preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Preferred stock dividends, undeclared	$ 0	$ 5,250	$ 0
Series B Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Preferred stock dividends, undeclared	$ 6,290	$ 6,327	$ 0
Antidilutive securities excluded from computation of diluted earnings per share	16.7

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Net Income (Loss) Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net income (loss) attributable to common stockholders (numerator for basic net income per share)									$ (23,533)	$ 218,420	$ 95,596
Net (income) loss allocated to participating securities									0	(215)	(123)
Numerator for basic net income (loss) per share									(23,533)	218,205	95,473
Numerator for diluted net income (loss) per share									$ (23,533)	$ 233,641	$ 110,909
Denominator:
Denominator: Denominator for basic net income (loss) per share - weighted average outstanding common shares									108,975	97,934	95,967
Denominator for diluted net income (loss) per share									108,975	128,130	124,875
Net income (loss) per share attributable to common stockholders - basic (USD per share)	$ (0.09)	$ (0.13)	$ (0.06)	$ 0.08	$ 1.40	$ 0.26	$ 0.21	$ 0.35	$ (0.22)	$ 2.23	$ 1.00
Net income (loss) per share attributable to common stockholders - diluted (USD per share)	$ (0.09)	$ (0.13)	$ (0.06)	$ 0.07	$ 1.10	$ 0.23	$ 0.20	$ 0.30	$ (0.22)	$ 1.82	$ 0.89
Equity option
Denominator:
Dilutive effect of stock									0	1,558	250
Performance RSUs
Denominator:
Dilutive effect of stock									0	1,308	1,328
Series A preferred stock
Numerator:
Preferred stock declared and undeclared									$ 0	$ 7,000	$ 7,000
Denominator:
Dilutive effect of preferred stock									0	10,602	10,602
Series B Preferred Stock [Member]
Numerator:
Preferred stock declared and undeclared									$ 0	$ 8,436	$ 8,436
Denominator:
Dilutive effect of preferred stock									0	16,728	16,728

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Related Party Transaction Disclosure Related Party Transactions (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage	35.70%	35.70%
Equity Method Investee [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties	$ 1,000	$ 1,000	$ 600
Equity Method Investee [Member] | Data Services Agreement [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties		9,100
Equity Method Investee [Member] | Hosting Agreement [Domain]
Related Party Transaction [Line Items]
Related Party Transaction, Hosting Fees		200,000
Revenue from Related Parties		8,100
Related Party, Receipt of Hosting Fees	$ 35,000
Related Party Transaction, Power Fees per Year		2,800
Related Party Transaction, Data Service Fees		19,800
Equity Method Investee [Member] | Amended Hosting Agreement [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties		13,900
Hosted Payload and Other Data Services [Member]
Related Party Transaction [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		40,527	$ 9,908	$ 3,633
Line of Credit [Member]
Related Party Transaction [Line Items]
Line of Credit Facility, Periodic Payment, Principal		$ 43,100

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Segments, Significant Customers, Supplier and Service Providers and Geographic Information Narrative (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
No Single Country or Region Representing More Than Stated Percentage of Total Revenue	10.00%	10.00%
No Single Country Greater than Stated Percentage - PP&E	10.00%	10.00%
No Single Customer Over 10% Total Revenue - Commercial	10.00%	10.00%
No Single Customer Over 10% Total Revenue - Government	10.00%	10.00%
Sales revenue, net | Prime contracts with U.S. government
Segment Reporting Information [Line Items]
Concentration risk, percentage	20.00%	24.00%	25.00%
Accounts receivable | Prime contracts with U.S. government
Segment Reporting Information [Line Items]
Concentration risk, percentage	34.00%	35.00%

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Segments, Significant Customers, Supplier and Service Providers and Geographic Information Net Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 3,370,855	$ 3,210,162
United states
Segment Reporting Information [Line Items]
Property, plant and equipment, net	188,203	165,337
Satellites in orbit
Segment Reporting Information [Line Items]
Property, plant and equipment, net	2,504,734	926,090
Iridium NEXT systems under construction (United States)
Segment Reporting Information [Line Items]
Property, plant and equipment, net	658,395	2,088,380
All others
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 19,523	$ 30,355

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Segments, Significant Customers, Supplier and Service Providers and Geographic Information Revenue By Geographic (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 132,165	$ 136,764	$ 134,931	$ 119,148	$ 115,469	$ 116,547	$ 111,604	$ 104,426	$ 523,008	$ 448,046	$ 433,640
United States
Segment Reporting Information [Line Items]
Revenues									276,398	229,741	226,190
Canada
Segment Reporting Information [Line Items]
Revenues									48,511	44,107	42,373
United Kingdom
Segment Reporting Information [Line Items]
Revenues									51,344	46,245	47,135
Other countries
Segment Reporting Information [Line Items]
Revenues									$ 146,755	$ 127,953	$ 117,942

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Employee Benefit Plan Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Defined-contribution plan matching employees’ contributions vested percentage	100.00%
Maximum employee contribution percentage	100.00%
Maximum deferral contribution percentage	5.00%
Defined-contribution plan employer-matching contributions amount	$ 3.0	$ 2.5	$ 1.3

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Schedule of Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Revenues	$ 132,165	$ 136,764	$ 134,931	$ 119,148	$ 115,469	$ 116,547	$ 111,604	$ 104,426	$ 523,008	$ 448,046	$ 433,640
Operating income (loss)	(142)	6,011	16,345	19,439	(13,950)	38,082	35,742	55,602	41,653	115,476	176,371
Net income (loss)	$ (7,582)	$ (12,856)	$ (4,418)	$ 11,472	$ 141,877	$ 29,253	$ 24,778	$ 37,948	$ (13,384)	$ 233,856	$ 111,032
Net income (loss) attributable to common stockholders per share - basic	$ (0.09)	$ (0.13)	$ (0.06)	$ 0.08	$ 1.40	$ 0.26	$ 0.21	$ 0.35	$ (0.22)	$ 2.23	$ 1.00
Net income (loss) attributable to common stockholders per share - diluted	$ (0.09)	$ (0.13)	$ (0.06)	$ 0.07	$ 1.10	$ 0.23	$ 0.20	$ 0.30	$ (0.22)	$ 1.82	$ 0.89
Depreciation									$ 216,600	$ 120,700	$ 48,600
Gain on Boeing transaction									$ 0	$ 14,189	$ 0
Kosmotras
Property, Plant and Equipment [Line Items]
Depreciation					$ 36,800