10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

____________________ 

FORM 10-K

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

FOR THE FISCAL YEAR ENDED DECEMBER 31, 2013

OR

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

FOR THE TRANSITION PERIOD FROM            TO           .

Commission File Number 0-26068

____________________

(Exact name of registrant as specified in its charter)

DELAWARE	95-4405754
(State or other jurisdiction of	(I.R.S. Employer
incorporation organization)	Identification No.)
500 NEWPORT CENTER DRIVE,
NEWPORT BEACH, CA	92660
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (949) 480-8300

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	The NASDAQ Stock Market, LLC

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 R 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  R

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 filing requirements for the past 90 days.   Yes R  No £

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted 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 and post such files).   Yes R 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.  R

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

Large accelerated filer    R	Accelerated filer £
Non-accelerated filer    £ (Do not check if a smaller reporting company)	Smaller reporting company    £

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).   Yes  £  No  R

The aggregate market value of the registrant’s voting and non-voting common stock held by non-affiliates of the registrant on June 30, 2013, the last business day of the registrant’s most recently completed second fiscal quarter, computed by reference to the last sale price of the registrant’s common stock as reported by The Nasdaq Global Select Market on such date, was approximately $1,084,840,000. This computation assumes that all executive officers and directors are affiliates of the registrant. Such assumption should not be deemed conclusive for any other purpose.

As of February 25, 2014, 50,640,123 shares of common stock were issued and outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

In accordance with General Instruction G(3) to Form 10-K, portions of the registrant’s Definitive Proxy Statement on Schedule 14A for its Annual Meeting of Stockholders to be filed with the Commission within 120 days after the close of the fiscal year covered by this Annual Report on Form 10-K are incorporated by reference into Part III of this Annual Report on Form 10-K.Only those portions of the proxy statement that are specifically incorporated by reference herein shall constitute a part of this Annual Report on Form 10-K.

ACACIA RESEARCH CORPORATION

ANNUAL REPORT ON FORM 10-K

FISCAL YEAR ENDED DECEMBER 31, 2013

TABLE OF CONTENTS

		Page
PART I
Item 1.	Business	3
Item 1A.	Risk Factors	10
Item 1B.	Unresolved Staff Comments	18
Item 2.	Properties	18
Item 3.	Legal Proceedings	18
Item 4.	Mine Safety Disclosures	18
PART II
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	19
Item 6.	Selected Financial Data	21
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	23
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	44
Item 8.	Financial Statements and Supplementary Data	44
Item 9.	Changes in and Disagreements With Accountants on Accounting and Financial Disclosure	44
Item 9A.	Controls and Procedures	44
Item 9B.	Other Information	45
PART III
Item 10.	Directors, Executive Officers and Corporate Governance	45
Item 11.	Executive Compensation	45
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	45
Item 13.	Certain Relationships and Related Transactions, and Director Independence	46
Item 14.	Principal Accounting Fees and Services	46
PART IV
Item 15.	Exhibits, Financial Statement Schedules	47

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PART I

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

As used in this Annual Report on Form 10-K, “we,” “us” and “our” refer to Acacia Research Corporation and/or its wholly and majority-owned operating subsidiaries.  All patent acquisition, development, licensing and enforcement activities are conducted solely by certain of our wholly owned operating subsidiaries.

This Annual Report on Form 10-K, or the annual report, contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, or the Securities Act, and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act, which include, without limitation, statements about our future business operations and results, our strategies and competition, and other forward-looking statements included in this annual report. Such statements may be identified by the use of forward-looking terminology such as “may,” “will,” “expect,” “believe,” “estimate,” “anticipate,” “intend,” “continue,” or similar terms, variations of such terms or the negative of such terms. Such statements are based on management’s current expectations and are subject to a number of risks and uncertainties, which could cause actual results to differ materially from those described in the forward-looking statements. Such statements address future events and conditions concerning earnings, capital expenditures, litigation, competition, regulatory matters, stock price volatility, liquidity and capital resources and accounting matters. Actual results in each case could differ materially from those anticipated in such statements by reason of factors such as future economic conditions, legislative, regulatory and competitive developments in markets in which we and our subsidiaries operate, and other circumstances affecting anticipated revenues and costs, as more fully disclosed in our discussion of “Risk Factors” in Item 1A of Part I of this annual report. We expressly disclaim any obligation or undertaking to release publicly any updates or revisions to any forward-looking statements contained herein to reflect any change in our expectations with regard thereto or any change in events, conditions or circumstances on which any such statement is based. Additional factors that could cause such results to differ materially from those described in the forward-looking statements are set forth in connection with the forward-looking statements.

ITEM 1.  BUSINESS

General

Our operating subsidiaries partner with inventors and patent owners, applying our legal and technology expertise to patent assets to unlock the financial value in their patented inventions. We are an intermediary in the patent marketplace, bridging the gap between invention and application, facilitating efficiency and delivering monetary rewards to patent owners.

Our operating subsidiaries generate revenues and related cash flows from the granting of intellectual property rights for the use of patented technologies that our operating subsidiaries control or own. Our operating subsidiaries assist patent owners with the prosecution and development of their patent portfolios, the protection of their patented inventions from unauthorized use, the generation of licensing revenue from users of their patented technologies and, where necessary, with the enforcement against unauthorized users of their patented technologies through the filing of patent infringement litigation. Currently, on a consolidated basis, our operating subsidiaries own or control the rights to over 200 patent portfolios, which include U.S. patents and certain foreign counterparts, covering technologies used in a wide variety of industries.

We are a leader in licensing and enforcing patented technologies and have established a proven track record of licensing success with over 1,345 license agreements executed to date, across 166 of our patent licensing programs. To date, Acacia has generated gross licensing revenue of approximately $1 billion, and has returned more than $455 million to our patent partners.

Other

We were originally incorporated in California in January 1993 and reincorporated in Delaware in December 1999. Our website address is www.acaciaresearch.com. Reference in this annual report to this website address does not constitute incorporation by reference of the information contained on the website. We make our filings with the Securities and Exchange Commission, or the SEC, including our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, other reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act, and amendments to the foregoing reports, available free of charge on or through our website as soon as reasonably practicable after we file these reports with, or furnish such reports to, the SEC. In addition, we post the following information on our website:

• our corporate code of conduct, our code of conduct for our board of directors and our fraud policy; and

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• charters for our audit committee, nominating and corporate governance committee, disclosure committee and compensation committee.

The public may read and copy any materials that we file with the SEC at the SEC’s Public Reference Room at 100 F Street, NE, Washington, D.C. 20549. The public may obtain information on the operation of the Public Reference Room by calling the SEC at 1-800-SEC-0330.

Also, the SEC maintains an Internet website that contains reports, proxy and information statements, and other information regarding issuers, including us, that file electronically with the SEC. The public can obtain any documents that we file with the SEC at http://www.sec.gov.

Patent Licensing and Enforcement Business

Our operating subsidiaries acquire rights in, license and enforce patented technologies. Our operating subsidiaries partner with inventors and patent owners, applying our legal and technology expertise to patent assets to unlock the financial value in their patented inventions. We are an intermediary in the patent marketplace, bridging the gap between invention and application, facilitating efficiency and delivering monetary rewards to patent owners.

Our operating subsidiaries generate revenues and related cash flows from the granting of intellectual property rights for the use of patented technologies that our operating subsidiaries control or own. Our operating subsidiaries assist patent owners with the prosecution and development of their patent portfolios, the protection of their patented inventions from unauthorized use, the generation of licensing revenue from users of their patented technologies and, where necessary, with the enforcement against unauthorized users of their patented technologies through the filing of patent infringement litigation.

Refer to the section entitled “Patented Technologies” below for a partial summary of patent portfolios owned or controlled by certain of our operating subsidiaries.

Patents are an important asset class worldwide. Due to legislative and regulatory changes, licensing and enforcing patents has become increasingly difficult for patent holders, necessitating an experienced, well-capitalized, licensing partner. We focus solely on the patent marketplace, and have emerged as the leading outsource patent licensing and enforcement company for patent owners that have made the important choice to outsource their patent licensing and enforcement activities.

We are a leader in patent licensing and enforcement and our operating subsidiaries have established a proven track record of licensing success with more than 1,345 license agreements executed to date. To date, on a consolidated basis, we have generated revenues from 166 of our patent licensing and enforcement programs. Our professional staff includes in-house patent attorneys, licensing executives, engineers and business development executives.

We partner with the disenfranchised patent owner, including individual inventors, universities, and large multi-national corporations in the technology, medical technology, energy, and industrial sectors. A disenfranchised patent owner owns patents that are being infringed by third-parties in connection with the design, manufacture, use, or distribution of products and/or services, but is not receiving fair compensation for the unauthorized use of his or her patented inventions by third-parties. We strive to reward inventors and patent owners for their creative technological contributions. We also partner with patent owners, including individual inventors, universities, and domestic and multi-national corporations who may have limited internal resources and/or expertise to effectively address the unauthorized use of their patented technologies, and those that are seeking to effectively and efficiently monetize their portfolio of patented technologies on an outsourced basis. In a typical arrangement, our operating subsidiary will partner with a patent portfolio owner, acquiring rights in the patent portfolio or acquiring the patent portfolio outright, and in exchange, the original patent portfolio owner receives (i) a percentage of our operating subsidiary’s net recoveries from the licensing and enforcement of the patent portfolio, which we refer to as our Partnering Model, or (ii) an upfront payment for the purchase of the patent portfolio rights or the patent portfolio, which we refer to as our Purchasing Model, or (iii) a combination of the two, which we refer to as our Hybrid Partnering Model.

Under U.S. law, a patent owner has the right to exclude others from making, selling or using their patented invention. In situations where a third-party produces, sells or uses the patented invention without authorization, that third-party is infringing the patent. Unfortunately, in the majority of cases, infringers are generally unwilling, at least initially, to negotiate or pay reasonable license fees for their unauthorized use of third-party patents and will typically fight any allegations of patent infringement. Inventors and/or patent holders without sufficient legal, financial and/or expert technical resources to bring and continue the pursuit of costly and complex patent infringement actions are often blatantly ignored.

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As a result of the common reluctance of patent infringers to negotiate and ultimately take a patent license for the use of third-party patented technologies without at least the threat of legal action, patent licensing and enforcement often begins with the filing of patent enforcement litigation. Most patent infringement litigation settles out of court, however, at values that are based on the strength of the patent and use of the invention in the infringer’s products or services. We execute agreements that grant rights in our patents to users of our patented technologies. Our agreements can be negotiated without the filing of patent litigation, or negotiated in the shadow of ongoing patent litigation, depending on the specific facts and circumstances.

Patents are a complex and highly technical subject area. Our professionals actively seek to identify high-quality but undervalued patent portfolios in a variety of industries. We combine our legal expertise, technology expertise, and our extensive knowledge of, and experience in, the patent licensing ecosystem, to continually uncover important patent assets and bring needed proficiency to patent licensing and enforcement.

Our partnership with patent owners is the cornerstone of our operating subsidiaries’ corporate strategy. We assume all responsibility for fronting operational expenses while pursuing a patent licensing and enforcement program, and then share net licensing revenue with our patent partners as that program matures, on a pre-arranged and negotiated basis. We may also provide upfront capital to the patent owner as an advance against future licensing revenue. We are a principal in the licensing and enforcement effort, with our operating subsidiaries obtaining control of the rights in the patent portfolio, or control of the patent portfolio outright.

Business Model and Strategy - Overview

We have the flexibility to structure arrangements in a number of ways to address the needs and specific sets of circumstances presented by each of our unique patent partners, including the following:

Partnering Model:

• 50/50 net profit sharing of revenue after legal costs and other licensing and enforcement costs.

• Typical partners include major corporations, research labs and universities and individual inventors.

• Upon return of advanced costs, net profit revenue share with patent partner commences.

Hybrid Partnering Model:

• Hybrid Partnership with up-front capital infusion to our patent partners as an advance on future licensing revenue streams.

• Increases our total addressable market providing an advantage over competitors.

• Typical partners include major corporations seeking to effectively and efficiently monetize their patent portfolios.

• We maintain 100% preferred rate of return until all deployed capital is returned.

• Upon return of capital infusion, net profit revenue share with patent partner commences.

• Target recovery of advanced capital in 18 months.

Purchasing Model:

• We acquire 100% of the patents for 100% of the profits, with no backed participation for patent owner.

• Typical partners include, distressed corporations, corporations with limited success controlled by venture capitalists.

• Target recovery of advanced capital in 18 months.

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Key Elements of Business Strategy

Patent licensing and enforcement can be an effective and efficient way to maximize the profit potential of a patent. A patent license agreement grants a third-party user of an invention specific patent rights to the patented invention in exchange for patent license fees. Patent licensing is especially suitable for patents that are owned by the patent-disenfranchised. Patent disenfranchised owners of patents are those that have not successfully converted their patented invention into a profitable product or service, and therefore, are not generating revenues from their patented inventions. The patent-disenfranchised, for example, include owners of the following categories of patented inventions:

• Inventions that were so far ahead of the technology curve that there is no existing ecosystem to support the patented products or services at the time they are introduced to market;

• Inventions that can only be deployed in very capital-intensive industries, such as semiconductor fabrication, energy, or medical sectors, but whose owners do not have sufficient amounts of capital to deploy; and

• Inventions that, for one reason or another, including the shifting of cost-effective manufacturing overseas, are no longer being practiced by the patent owner.

Our patent licensing business provides patent holders with an opportunity to generate income from their patented inventions being practiced by third-parties without authorization. Our patent licensing and enforcement business strategy, conducted solely by our operating subsidiaries, includes three fundamental elements, as follows:

• Patent Discovery - Discover potentially valuable patents or patent portfolios.

• Assessment of Economic Value - Work with experts to evaluate the use of the patented invention(s) in the relevant marketplace and assess patents or patent portfolios’ expected economic value.

• Licensing and Enforcement - For unauthorized users of the patented invention, enter into license negotiations and, if necessary, litigation to monetize the patent based on its assessed value.

Patent Discovery. The patent process breeds, encourages and sustains innovation and invention by granting a limited monopoly to the inventor in exchange for sharing the invention with the public. Certain technologies, including several of the technologies controlled by our operating subsidiaries, some of which are summarized below, become core technologies in the way products and services are manufactured, sold and delivered by companies across a wide array of industries. Our operating subsidiaries identify core, patented technologies that have been or are anticipated to be widely adopted by third-parties in connection with the manufacture or sale of products and services. Patent discovery occurs when we reach out to patent holders who may be disenfranchised, or when patent holders approach us seeking assistance with the monetization and enforcement of their patent portfolios.

Assessment of Economic Value. Subsequent to the patent discovery process, our executives work internally and/or with external industry experts in the specific technology field, to evaluate the patented invention and its adoption and implementation in the marketplace. There are several key factors to consider when analyzing a patent and determining a patent’s value: (1) Infringement, (2) Validity and (3) Enforceability.

• Infringement. To determine infringement, we must first identify third-parties that are practicing the invention(s) covered by the patent without obtaining permission from the patent owner to do so. A key tool in determining whether or not a company is infringing a patent is a claim chart. A claim chart demonstrates how the manufacture and sale of an existing product compares against the claims of the patent.

• Invalidity. The three main factors analyzed to determine invalidity are (1) anticipation, (2) obviousness, and (3) the existence of non-patentable subject matter. Anticipation occurs when the claims of the patent are entirely revealed within a single piece of prior art. “Prior art” is a technical term that generally refers to an invention that existed prior to the grant of the patent being analyzed. Even if the claims of the patent are not entirely revealed within a single piece of prior art, the patent may still be invalid if determined to be “obvious” under the law. “Obvious” essentially means that the differences between prior art and the patented invention are so slight such that they would have been obvious at the time of invention to one who is skilled in the subject matter being patented. Even if the patent lacks anticipation and obviousness, it may still be invalid if its subject matter is un-patentable by law. Un-patentable subject matter includes naturally occurring things, abstract concepts, or algorithms that perform an ordinary function.

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• Enforceability. A myriad of factors are analyzed to determine whether or not a patent is enforceable, including whether or not there has been patent misuse, or whether or not there are antitrust violations associated with the patent. Due to the inherently complex nature of patent law, only a court or specific administrative body, such as the International Trade Commission, can make a decision whether a patent is infringed, valid and enforceable; however, we employ our wealth of expertise to make the best assessment possible given a specific fact pattern and set of circumstances.

We estimate a patent’s economic value by evaluating the expected value of the license revenue stream based on past, present and future revenue of infringing products or services, and the risk that a court will disagree with our infringement, validity or enforcement assessments of the patent.

The processes and procedures employed in connection with the evaluation of a specific patent portfolio for acquisition, licensing and enforcement are tailored and unique to each specific situation and can vary widely based on the specific facts and circumstances of a specific patent portfolio, such as the related technology, related industry and certain other factors. Some of the key components of our processes and procedures may include:

• Utilizing our staff of in-house business development executives, patent attorneys, patent licensing executives, and technology engineers to conduct our tailored patent acquisition and evaluation processes and procedures. We may also leverage the expertise of external specialists and technology consultants.

• Identifying emerging growth areas where patented technologies will play a vital role in connection with the manufacture or sale of products and services.

• Identifying core, patented technologies that have been or are anticipated to be widely adopted by third-parties in connection with the manufacture or sale of products and services.

• Considering the impact of subtleties in the language of a patent, recorded interactions with the patent office, evaluating prior art and literature and considering the impact on the potential licensing and enforcement revenue that can be derived from a patent or patent portfolio.

• Evaluating the strength of a patent portfolio, including consideration of the types of claims and the number of claims potentially infringed by third-parties, and the results of any prior art searches or analysis, before the decision is made to allocate resources to an acquisition or an effective licensing and enforcement effort.

• Identifying and considering potential problem areas, if any, and determining whether potential problem areas can be overcome prior to acquiring a patent portfolio or launching an effective licensing program.

• Identifying potential infringers, industries within which the potential infringers exist, longevity of the patented technology, and a variety of other factors that directly impact the magnitude and potential success of a licensing and enforcement program.

Licensing and Enforcement. The final step in the patent licensing and enforcement process is to monetize the patent by securing license agreements based on the patents estimated value. While we prefer to convince unauthorized users of our patented inventions of the value of the patented invention and secure a license agreement in a non-litigious manner, many infringers refuse to take such licenses even when confronted with substantial and persuasive evidence of infringement, validity, enforceability and significant economic value. As a result, often we must resort to litigation to demonstrate and prove infringement and ultimately induce infringers to take a license. We have found it effective to negotiate licenses concurrently with litigation due to the fact that litigation necessitates and facilitates an information exchange that helps both sides assess the value of a patent and make informed decisions. Also, litigation eventually leads to a court’s judgment. When a court agrees with our assessment of a patent, this judgment stops recalcitrant infringers from indefinitely profiting from the patent they are infringing.

Our operating subsidiaries engage highly competent and experienced patent lawyers to prosecute their patent portfolio litigation. It is imperative to be persistent and patient throughout the litigation process as it typically takes 18-36 months from the filing date of a lawsuit to yield a license agreement from a potential licensee. Often, it takes longer to secure a final court judgment.

Patent license negotiations and litigation initiated by our operating subsidiaries usually lead to serious and thoughtful discussions with the unauthorized users of the patented inventions.  The result can be quite favorable with the user being granted rights under the patents for the patented invention in its products and services in exchange for financial remuneration. This remuneration is typically shared between our operating subsidiary and the patent holder.

Concurrent with our patent litigation and licensing negotiation activities, we often assist patent holders with the acquisition of additional rights associated with their inventions both in the United States and across the globe. This is referred

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to as “continued prosecution,” and is done to further define the boundaries of an invention. It can also be effective to correct technical deficiencies discovered within a patent that may have been identified in the negotiation and litigation process. These deficiencies, if not appropriately addressed, can limit the value of patents that are otherwise infringed, valid, enforceable.

Our specialists, along with third-party experts that we engage, are trained and skilled in the areas of patent discovery, assessment of a patent or patent portfolios expected economic value, and patent licensing and enforcement. In applying our legal and technology expertise to high quality patent assets, we bridge the gap between invention and application, facilitating efficiency and delivering monetary rewards to the patent disenfranchised and other patent owners with whom we partner.

Patented Technologies

Currently, on a consolidated basis, our operating subsidiaries own or control the rights to patent portfolios with future patent expiration dates ranging from 2014 to approximately 2031, covering technologies used in a wide variety of industries, a sample of which includes the following:

Operating Subsidiary	Industry	Description
3D Design Solutions, LLC	Software	Patents relating to Computer-Aided Design Technology.
Adaptix, Inc.	Telecommunications / Smartphones	Portfolio relates to air interface technology used in modern 4G wireless networks. The patents relate to both infrastructure and user equipment.
American Vehicular Sciences, LLC	Transportation And Automotive	Patents from Automotive Technologies International, or ATI and Intelligent Technologies International, or ITI, relating to numerous automotive safety, navigation and diagnostics technologies.
Auto-Dimensions, LLC	Software	Patents relating to Computer Aided Design Tools and Product Lifecycle Management.
Automated Facilities Management Corporation	Software	Patent relating to Facilities Operation Management System.
Battle Toys, LLC	Mechanical	Patent relates to a Jousting Toy used in children’s games.
Beverage Dispensing Solutions, LLC	Software	Patents for Computerized Beverage Dispensing Technology.
Body Science, LLC	Peripheral Vascular Devices	Patents relating to apparatus for use in wireless physiological monitoring.
Bolt MRI Technologies, LLC	Imaging And Diagnostics	Patents and applications relating to apparatus and methods for use in medical imaging, including, but not limited to stand up or inclined MRI.
Bonutti Skeletal Innovations, LLC	Orthopedic Implants And Sports Medicine Market	Issued and pending patents and applications in the orthopedic field covering, among other things, suture anchors, biologics, total knee replacements, total hip replacements, minimally invasive surgery, partial knee and hip replacement, spinal implants, and surgical instruments and methods of use.
Brandywine Communications Technologies, LLC	Communications	Patents related to Broadband Communications Technology.
Brilliant Optical Solutions, LLC	Semiconductor/MEMS	Patent relates to Core Fiber Optic Network Architectures.
Cell and Network Selection, LLC	Telecommunications / Smartphones	Patent family generally relates to LTE user equipment (phones, tablets, dongles).
Cellular Communications Equipment, LLC	Telecommunications / Smartphones	Portfolio covers Wireless Infrastructure and User Equipment Technology relating to second (2G), third (3G) and fourth (4G) generation wireless technologies and to air interface technology used in 2G, 3G and 4G wireless networks.
CeraMedic, LLC	Medical	U.S. patent plus foreign patent relating to Ceramic Hip Replacement technology.
Computer Software Protection, LLC	Software	Patent for Software Activation Technology, which generally relates to preventing software from running on unlicensed systems.
Criminal Activity Surveillance, LLC	Security	Patents relating to Video Analytics for Security Technology.
Data Engine Technologies, LLC	Software	Patent portfolio covering a wide range of Software Technology.
Database Sync Solutions, LLC	Internet/Ecommerce/Business Methods	Patent generally relates to the distributed management and synchronization of select data elements between applications based on pre-defined permissions.
Delaware Display Group, LLC	Transportation And Automotive	Portfolio relates to certain display technologies used in smartphones, tablets, computers, HDTVs and other devices.
Dynamic 3D Geosolutions, LLC	Software	Patent related to Geological Interpretation and Modeling Technology.

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Endotach, LLC	Peripheral Vascular Devices	Patents relating to stent grafts.
EVM Systems, LLC	Peripheral Vascular Devices	Patents and applications covering a series of medical instruments utilizing a slotted, shape memory tube.
Express Card Systems, LLC	Internet/Ecommerce/Business Methods	Patents for Greeting Card Technology, which generally relates to the processing and printing of greeting cards and can be used by online merchants.
GT Gaming, LLC	Internet/Ecommerce/Business Methods	Patent relating to Online Gaming Technology.
In-Depth Test, LLC	Semiconductor/MEMS	Patent portfolio relating to Semiconductor Testing Technology.
Industrial Print Technologies, LLC	Computers/Peripherals/Printers	Patent portfolio covering ink jet printer and ink jet printing technologies and other printer and printing technologies.
Innovative Display Technologies, LLC	Telecommunications / Smartphones	Portfolio generally relates to back-lighting for displays and the patented technology covers various improvements to LCD displays.
InterCarrier Communications, LLC	Telecommunications / Smartphones	The Intercarrier SMS technology relates to sending SMS messages between different carriers and networks. This includes traditional SMS and OTT messaging.
Labyrinth Optical Technologies, LLC	Communications	Patents relating to Optical Networking Technology.
Lambda Optical Solutions, LLC	Communications	Patents relating to Optical Switching Technology.
LifePort Sciences, LLC	Peripheral Vascular Devices	Multiple patents and applications relating to, among other things, stent grafts, stent graft delivery systems and stent placement procedures.
LifeScreen Sciences, LLC	Peripheral Vascular Devices	Portfolio consists of multiple patents and applications relating to, among other things, vena cava filters, embolic protection and associated delivery systems.
LifeShield Sciences, LLC	Peripheral Vascular Devices	Portfolio consists of multiple patents and applications relating to stent grafts, and stent graft delivery systems.
Light Transformation Technologies, LLC	Energy/Lighting	Patents relating to Improved Lighting Technology.
Mobile Enhancement Solutions, LLC	Telecommunications / Smartphones	This portfolio relates to enhanced mobile communications and covers many features found in smartphones today.
Online News Link, LLC	Internet/Ecommerce/Business Methods	Patents relate to embedded links in on-line newsletters.
Optimum Content Protection, LLC and Super Interconnect Technologies, LLC	Telecommunications / Smartphones	Portfolios relate to high speed circuit interconnect, display control technology and content security used in consumer electronics, PCs and mobile devices such as smartphones, tablets, and laptops.
Progressive Semiconductor Solutions, LLC	Semiconductor/MEMS	Patent portfolio covering Microprocessor and Memory Technology.
Promethean Insulation Technology, LLC	Energy/Lighting	Patent relates to insulation material used in building construction.
Saint Lawrence Communications, LLC	Wireless	Patents relating to Speech Codecs used in Wireless and Wireline Systems.
Signal Enhancement Technologies, LLC	Telecommunications / Smartphones	Portfolio covers radio frequency modulation technology used in mobile devices such as smartphones, tablets, and laptops from a major technology company.
Smartphone Technologies, LLC	Telecommunications / Smartphones	Portfolio includes patents from Palmsource and Geoworks, amongst others, that resulted from the merging of personal digital assistants and cell phones, a space in which Palm was the undisputed leader. Specifically, the patents are directed towards various interface and synchronization technologies which are used on modern smartphones today.
Super Resolution Technologies, LLC	Imaging And Diagnostics	Portfolio comprises U.S. and foreign patents relating to super resolution microscopy, also referred to as nanoscopy.
Unified Messaging Solutions, LLC	Communications	Patent for Messaging Technology.
Vertical Analytics, LLC	Medical	Patents for X-ray Powder Diffraction Technology.
Video Streaming Solutions, LLC	Digital Media	Patent portfolios related to video delivery & processing technology.
Wireless Mobile Devices, LLC	Telecommunications / Smartphones	Portfolio includes patents that cover a wide range of wireless services such as Location Based Services technology and navigation that can be found on all smartphones today.

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Revenues for the periods presented include revenues generated from several of the portfolios summarized above and other technology patent portfolios owned or controlled by us. Refer to Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations - Overview” for a summary of patent portfolios generating revenues for the applicable periods presented.

Patent Enforcement Litigation

Our operating subsidiaries are often required to engage in litigation to enforce their patents and patent rights. Certain of our operating subsidiaries are parties to ongoing patent enforcement related litigation, alleging infringement by third-parties of certain of the patented technologies owned or controlled by our operating subsidiaries.

Competition

We expect to encounter increased competition in the area of patent acquisitions and enforcement. This includes an increase in the number of competitors seeking to acquire the same or similar patents and technologies that we may seek to acquire. Non-practicing entities such as RPX, AST, Intellectual Ventures, Wi-LAN, MOSAID, Round Rock Research LLC, IPvalue Management Inc., Vringo Inc. and Pendrell Corporation compete in acquiring rights to patents, and we expect more entities to enter the market.

We also compete with financial firms, corporate buyers and others acquiring IP. Many of these competitors may have more financial and human resources than our operating subsidiaries. As we become more successful, we may find more companies entering the market for similar technology opportunities, which may reduce our market share in one or more technology industries that we currently rely upon to generate future revenue.

Companies or other entities may develop competing technologies that offer better or less expensive alternatives to our patented technologies that we may acquire and license. Many potential competitors may have significantly greater resources than the resources that our operating subsidiaries possess. Such technological advances or entirely different approaches developed by one or more of our competitors could render certain of the technologies owned or controlled by our operating subsidiaries obsolete and/or uneconomical.

Employees

As of December 31, 2013, on a consolidated basis, we had 68 full-time employees. Neither we, nor any of our subsidiaries, are a party to any collective bargaining agreement. We consider our employee relations to be good.

ITEM 1A.  RISK FACTORS

The following is a summary of certain risks we face in our business. They are not the only risks we face. Additional risks that we do not yet know of or that we currently believe are immaterial may also impair our business operations. If any of the following risks actually occur, our business, financial condition and results of operations could be materially adversely affected, and the trading price of our common stock could decline significantly. All patent acquisition, development, licensing and enforcement activities are conducted solely by certain of our wholly and majority-owned operating subsidiaries.

Risks Related to Our Business

We have a history of losses and may incur additional losses in the future.

Despite reporting net income of $59.5 million and $21.1 million for the years ended December 31, 2012 and 2011, respectively, we reported a net loss of $56.4 million for the year ended December 31, 2013 and, on a cumulative basis, we have sustained substantial losses since our inception. As of December 31, 2013, our accumulated deficit was $62.1 million. As of December 31, 2013, we had approximately $256.7 million in cash and cash equivalents and short-term investments and working capital of $247.7 million. We expect to continue incurring significant legal, marketing and general and administrative expenses in connection with our operations. As a result, we anticipate that we may incur losses in the future. We believe, however, that our current cash and cash equivalents and investments will be sufficient to finance our anticipated capital and operating requirements for at least the next twelve months.

If we encounter unforeseen difficulties with our business or operations in the future that require us to obtain additional working capital, and we cannot obtain additional working capital on favorable terms, or at all, our business may suffer.

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Our consolidated cash and cash equivalents and short-term investments totaled $256.7 million and $311.3 million at December 31, 2013 and 2012, respectively. To date, we have relied primarily upon net cash flows from our operations and from the public and private sale of equity securities to generate the working capital needed to finance our operations.

We may encounter unforeseen difficulties with our business or operations in the future that may deplete our capital resources more rapidly than anticipated. As a result, we may be required to obtain additional working capital in the future through bank credit facilities, public or private debt or equity financings, or otherwise. If we are required to raise additional working capital in the future, such financing may be unavailable to us on favorable terms, if at all, or may be dilutive to our existing stockholders. If we fail to obtain additional working capital, as and when needed, such failure could have a material adverse impact on our business, results of operations and financial condition.

Failure to effectively manage our growth could place strains on our managerial, operational and financial resources and could adversely affect our business and operating results.

Our growth has placed, and is expected to continue to place, a strain on our managerial, operational and financial resources and systems. Further, as our subsidiary companies’ businesses grow, we will be required to continue to manage multiple relationships. Any further growth by us or our subsidiary companies, or an increase in the number of our strategic relationships, may place additional strain on our managerial, operational and financial resources and systems. Although we may not grow as we expect, if we fail to manage our growth effectively or to develop and expand our managerial, operational and financial resources and systems, our business and financial results will be materially harmed.

Our future success depends on our ability to expand our organization to match the growth of our subsidiaries.

As our operating subsidiaries grow, the administrative demands upon us and our operating subsidiaries will grow, and our success will depend upon our ability to meet those demands. These demands include increased accounting, management, legal services, staff support, and general office services. We may need to hire additional qualified personnel to meet these demands, the cost and quality of which is dependent in part upon market factors outside of our control. Further, we will need to effectively manage the training and growth of our staff to maintain an efficient and effective workforce, and our failure to do so could adversely affect our business and operating results.

Potential acquisitions may present risks, and we may be unable to achieve the financial or other goals intended at the time of any potential acquisition.

Our future growth depends, in part, on our ability to acquire patented technologies, patent portfolios, or companies holding such patented technologies and patent portfolios. Accordingly, we have engaged in acquisitions to expand our patent portfolios and we intend to continue to explore such acquisitions. Such acquisitions are subject to numerous risks, including the following:

• our inability to enter into a definitive agreement with respect to any potential acquisition, or if we are able to enter into such agreement, our inability to consummate the potential acquisition;

• difficulty integrating the operations, technology and personnel of the acquired entity;

• our inability to achieve the anticipated financial and other benefits of the specific acquisition;

• our inability to retain key personnel from the acquired company, if necessary;

• difficulty in maintaining controls, procedures and policies during the transition and integration process;

• diversion of our management’s attention from other business concerns; and

• failure of our due diligence process to identify significant issues, including issues with respect to patented technologies and patent portfolios, and other legal and financial contingencies.

If we are unable to manage these risks effectively as part of any acquisition, our business could be adversely affected.

Our revenues are unpredictable, and this may harm our financial condition.

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From January 2005 to the present, our operating subsidiaries have executed our business strategy of acquiring patent portfolios and accompanying patent rights. Currently, on a consolidated basis, our operating subsidiaries own or control the rights to over 200 patent portfolios which include U.S. patents and certain foreign counterparts, covering technologies used in a wide variety of industries. These acquisitions continue to expand and diversify our revenue generating opportunities. We believe that our cash and cash equivalents and short-term investment balances, anticipated cash flow from operations, proceeds from prior offerings of our common stock (refer to “Liquidity and Capital Resources” below) and other external sources of available credit, will be sufficient to meet our cash requirements through at least March 2015 and for the foreseeable future. However, due to the nature of our licensing business and uncertainties regarding the amount and timing of the receipt of license and other fees from potential infringers, stemming primarily from uncertainties regarding the outcome of enforcement actions, rates of adoption of our patented technologies, the growth rates of our existing licensees and certain other factors, our revenues may vary significantly from quarter to quarter, which could make our business difficult to manage, adversely affect our business and operating results, cause our quarterly results to fall below market expectations and adversely affect the market price of our common stock.

Our operating subsidiaries depend upon relationships with others to provide technology-based opportunities that can develop into profitable royalty-bearing licenses, and if they are unable to maintain and generate new relationships, then they may not be able to sustain existing levels of revenue or increase revenue.

Neither we nor our operating subsidiaries invent new technologies or products; rather, we depend upon the identification and acquisition of new patents and inventions through our relationships with inventors, universities, research institutions, technology companies and others. If our operating subsidiaries are unable to maintain those relationships and to continue to grow new relationships, then they may not be able to identify new technology-based opportunities for sustainable revenue and growth.

Our current or future relationships may not provide the volume or quality of technologies necessary to sustain our business. In some cases, universities and other technology sources may compete against us as they seek to develop and commercialize technologies. Universities may receive financing for basic research in exchange for the exclusive right to commercialize resulting inventions. These and other strategies may reduce the number of technology sources and potential clients to whom we can market our services. If we are unable to maintain current relationships and sources of technology or to secure new relationships and sources of technology, such inability may have a material adverse effect on our operating results and financial condition.

The success of our operating subsidiaries depends in part upon their ability to retain the best legal counsel to represent them in patent enforcement litigation.

The success of our licensing business depends upon our operating subsidiaries’ ability to retain the best legal counsel to prosecute patent infringement litigation. As our operating subsidiaries’ patent enforcement actions increase, it will become more difficult to find the best legal counsel to handle all of our cases because many of the best law firms may have a conflict of interest that prevents their representation of our subsidiaries.

We spend a significant amount of our financial and management resources to pursue our current litigation matters. We believe that these litigation matters and others that we may in the future determine to pursue could continue for years and continue to consume significant financial and management resources. The counterparties to our litigation are sometimes large, well-financed companies with substantially greater resources than us. We cannot assure that any of our current or future litigation matters will result in a favorable outcome for us. In addition, even if we obtain favorable interim rulings or verdicts in particular litigation matters, they may not be predictive of the ultimate resolution of the dispute. Also, we cannot assure that we will not be exposed to claims or sanctions against us which may be costly or impossible for us to defend. Unfavorable or adverse outcomes may result in losses, exhaustion of financial resources or other adverse effects which could encumber our ability to develop and commercialize products.

Our operating subsidiaries, in certain circumstances, rely on representations, warranties and opinions made by third-parties that, if determined to be false or inaccurate, may expose us and our operating subsidiaries to certain material liabilities.

From time to time, our operating subsidiaries may rely upon representations and warranties made by third-parties from whom our operating subsidiaries acquired patents or the exclusive rights to license and enforce patents. We also may rely upon the opinions of purported experts. In certain instances, we may not have the opportunity to independently investigate and verify the facts upon which such representations, warranties, and opinions are made. By relying on these representations, warranties and opinions, our operating subsidiaries may be exposed to liabilities in connection with the licensing and enforcement of certain patents and patent rights which could have a material adverse effect on our operating results and financial condition.

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In connection with patent enforcement actions conducted by certain of our subsidiaries, a court may rule that we or our subsidiaries have violated certain statutory, regulatory, federal, local or governing rules or standards, which may expose us and our operating subsidiaries to certain material liabilities.

In connection with any of our patent enforcement actions, it is possible that a defendant may request and/or a court may rule that we have violated statutory authority, regulatory authority, federal rules, local court rules, or governing standards relating to the substantive or procedural aspects of such enforcement actions. In such event, a court may issue monetary sanctions against us or our operating subsidiaries or award attorney’s fees and/or expenses to a defendant(s), which could be material, and if we or our operating subsidiaries are required to pay such monetary sanctions, attorneys’ fees and/or expenses, such payment could materially harm our operating results and our financial position.

Our licensing cycle is lengthy and costly, and our marketing, legal and sales efforts may be unsuccessful.

We expect our operating subsidiaries to incur significant marketing, legal and sales expenses prior to entering into license agreements and generating license revenues. We will also spend considerable resources educating prospective licensees on the benefits of a license arrangement with us. As such, we may incur significant losses in any particular period before any associated revenue stream begins.

If our efforts to educate prospective licensees on the benefits of a license arrangement are unsuccessful, we may need to pursue litigation or other enforcement action to protect our patent rights. We may also need to litigate to enforce the terms of our existing license agreements, protect our trade secrets, or determine the validity and scope of the proprietary rights of others. Enforcement proceedings are typically protracted and complex. The costs are typically substantial, and the outcomes are unpredictable. Enforcement actions will divert our managerial, technical, legal and financial resources from business operations.

Risks Related to Our Industry

Our exposure to uncontrollable outside influences, including new legislation, court rulings or actions by the United States Patent and Trademark Office, could adversely affect our licensing and enforcement business and results of operations.

Our licensing and enforcement business is subject to numerous risks from outside influences, including the following:

New legislation, regulations or rules related to obtaining patents or enforcing patents could significantly increase our operating costs and decrease our revenue.

Our operating subsidiaries acquire patents with enforcement opportunities and spend a significant amount of resources to enforce those patents. If new legislation, regulations or rules are implemented either by Congress, the U.S. Patent and Trademark Office, or USPTO, or the courts that impact the patent application process, the patent enforcement process or the rights of patent holders, such changes could negatively affect our expenses and revenue. Recently, United States patent laws were amended with the enactment of the Leahy-Smith America Invents Act, or the America Invents Act, which took effect on March 16, 2013. The America Invents Act includes a number of significant changes to U.S. patent law. In general, the legislation attempts to address issues surrounding the enforceability of patents and the increase in patent litigation by, among other things, establishing new procedures for patent litigation. For example, the America Invents Act changes the way that parties may be joined in patent infringement actions, increasing the likelihood that such actions will need to be brought against individual allegedly-infringing parties by their respective individual actions or activities. In addition, the America Invents Act enacted a new inter-partes review (“IPR”) process at the USPTO which can be used by defendants, and other individuals and entities, to separately challenge the validity of any patent. At this time, it is not clear what, if any, impact the America Invents Act will have on the operation of our enforcement business. However, the America Invents Act and its implementation could increase the uncertainties and costs surrounding the enforcement of our patented technologies, which could have a material adverse effect on our business and financial condition.

In addition, the U.S. Department of Justice, or the DOJ, has conducted reviews of the patent system to evaluate the impact of patent assertion entities on industries in which those patents relate. It is possible that the findings and

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recommendations of the DOJ could impact the ability to effectively license and enforce standards-essential patents and could increase the uncertainties and costs surrounding the enforcement of any such patented technologies. Also, the Federal Trade Commission, or FTC, has published its intent to initiate a proposed study under Section 6(b) of the Federal Trade Commission Act to evaluate the patent assertion practice and market impact of Patent Assertion Entities, or PAEs.  The FTC’s notice and request for public comment relating to the PAE study appeared in the Federal Register on October 3rd, 2013.  It is anticipated that Acacia Research Corporation and/or certain of its subsidiaries will be subject to this FTC study which would require the collection of certain information as detailed in notice published by the FTC.  It is expected that the results of the PAE study by the FTC will be provided to Congress and other agencies, such as the DOJ, who could take action, including legislative proposals, based on the results of the study.

Finally, new rules regarding the burden of proof in patent enforcement actions could significantly increase the cost of our enforcement actions, and new standards or limitations on liability for patent infringement could negatively impact our revenue derived from such enforcement actions.

Changes in patent law could adversely impact our business.

Patent laws may continue to change, and may alter the historically consistent protections afforded to owners of patent rights. Such changes may not be advantageous for us and may make it more difficult to obtain adequate patent protection to enforce our patents against infringing parties. Increased focus on the growing number of patent-related lawsuits may result in legislative changes which increase our costs and related risks of asserting patent enforcement actions. For instance, the United States House of Representatives passed a bill that would require non-practicing entities that bring patent infringement lawsuits to pay legal costs of the defendants, if the lawsuits are unsuccessful and certain standards are not met.

Trial judges and juries often find it difficult to understand complex patent enforcement litigation, and as a result, we may need to appeal adverse decisions by lower courts in order to successfully enforce our patents.

It is difficult to predict the outcome of patent enforcement litigation at the trial level. It is often difficult for juries and trial judges to understand complex, patented technologies, and as a result, there is a higher rate of successful appeals in patent enforcement litigation than more standard business litigation. Such appeals are expensive and time consuming, resulting in increased costs and delayed revenue. Although we diligently pursue enforcement litigation, we cannot predict with significant reliability the decisions made by juries and trial courts.

More patent applications are filed each year resulting in longer delays in getting patents issued by the USPTO.

Certain of our operating subsidiaries hold and continue to acquire pending patents. We have identified a trend of increasing patent applications each year, which we believe is resulting in longer delays in obtaining approval of pending patent applications. The application delays could cause delays in recognizing revenue from these patents and could cause us to miss opportunities to license patents before other competing technologies are developed or introduced into the market.

Federal courts are becoming more crowded, and as a result, patent enforcement litigation is taking longer.

Our patent enforcement actions are almost exclusively prosecuted in federal court. Federal trial courts that hear our patent enforcement actions also hear criminal cases. Criminal cases always take priority over our actions. As a result, it is difficult to predict the length of time it will take to complete an enforcement action. Moreover, we believe there is a trend in increasing numbers of civil lawsuits and criminal proceedings before federal judges and, as a result, we believe that the risk of delays in our patent enforcement actions will have a greater effect on our business in the future unless this trend changes.

Any reductions in the funding of the USPTO could have an adverse impact on the cost of processing pending patent applications and the value of those pending patent applications.

The assets of our operating subsidiaries consist of patent portfolios, including pending patent applications before the USPTO. The value of our patent portfolios is dependent upon the issuance of patents in a timely manner, and any reductions in the funding of the USPTO could negatively impact the value of our assets. Further, reductions in funding from Congress could result in higher patent application filing and maintenance fees charged by the USPTO, causing an unexpected increase in our expenses.

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Competition is intense in the industries in which our subsidiaries do business and as a result, we may not be able to grow or maintain our market share for our technologies and patents.

We expect to encounter competition in the area of patent acquisition and enforcement as the number of companies entering this market is increasing. This includes competitors seeking to acquire the same or similar patents and technologies that we may seek to acquire. Entities including RPX, AST, Intellectual Ventures, Wi-LAN, MOSAID, Round Rock Research LLC, IPvalue Management Inc., Vringo Inc. and Pendrell Corporation compete in acquiring rights to patents, and we expect more entities to enter the market. As new technological advances occur, many of our patented technologies may become obsolete before they are completely monetized. If we are unable to replace obsolete technologies with more technologically advanced patented technologies, then this obsolescence could have a negative effect on our ability to generate future revenues.

Our licensing business also competes with venture capital firms and various industry leaders for patent licensing opportunities. Many of these competitors may have more financial and human resources than we do. As we become more successful, we may find more companies entering the market for similar technology opportunities, which may reduce our market share in one or more technology industries that we currently rely upon to generate future revenue.

Our patented technologies face uncertain market value.

Our operating subsidiaries have acquired patents and technologies that are in the early stages of adoption in the commercial and consumer markets. Demand for some of these technologies is untested and is subject to fluctuation based upon the rate at which our licensees will adopt our patents and technologies in their products and services.

As patent enforcement litigation becomes more prevalent, it may become more difficult for us to voluntarily license our patents.

We believe that the more prevalent patent enforcement actions become, the more difficult it will be for us to voluntarily license our patents. As a result, we may need to increase the number of our patent enforcement actions to cause infringing companies to license the patent or pay damages for lost royalties. This may increase the risks associated with an investment in our company.

The markets served by our operating subsidiaries are subject to rapid technological change, and if our operating subsidiaries are unable to develop and acquire new technologies and patents, our ability to generate revenues could be substantially impaired.

The markets served by our operating subsidiaries and their licensees frequently undergo transitions in which products rapidly incorporate new features and performance standards on an industry-wide basis. Products for communications applications and high-speed computing applications, as well as other applications covered by our operating subsidiaries’ intellectual property, are based on continually evolving industry standards. In addition, the communications industry is intensely competitive and has been impacted by price erosion, rapid technological change, short product life cycles, cyclical market patterns and increasing foreign and domestic competition. Our ability to compete in the future will depend on our ability to identify and ensure compliance with evolving industry standards. This will require our continued efforts and success in acquiring new patent portfolios with licensing and enforcement opportunities. While we expect for the foreseeable future to have sufficient liquidity and capital resources to maintain the level of acquisitions necessary to keep pace with these technological advances, various factors may require us to have greater liquidity and capital resources than we currently expect. If we are unable to acquire new patented technologies and patent portfolios, or to identify and ensure compliance with evolving industry standards, our ability to generate revenues could be substantially impaired and our business and financial condition could be materially harmed.

Uncertainty in global economic conditions could negatively affect our business, results of operations and financial condition.

Our revenue-generating opportunities depend on the use of our patented technologies by existing and prospective licensees, the overall demand for the products and services of our licensees, and on the overall economic and financial health of our licensees. Although economic conditions appear to be improving, recent uncertainties in global economic conditions have resulted in the tightening of the credit markets, a low level of liquidity in many financial markets, and extreme volatility in the credit, equity and fixed income markets. If economic conditions do not continue to improve, or if they further deteriorate, many of our licensees’ customers, which may rely on credit financing, may delay or reduce their purchases of our licensees’ products and services. In addition, the use or adoption of our patented technologies is often based on current and forecasted demand for our licensees’ products and services in the marketplace and may require companies to make significant initial commitments of

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capital and other resources. If negative conditions in the global credit markets delay or prevent our licensees’ and their customers’ access to credit, overall consumer spending on the products and services of our licensees may decrease and the adoption or use of our patented technologies may slow, respectively. Further, if the markets in which our licensees’ participate do not continue to improve, or deteriorate further, this could negatively impact our licensees’ long-term sales and revenue generation, margins and operating expenses, which could in turn have an adverse effect on our business, results of operations and financial condition.

In addition, we have significant patent-related intangible assets recorded on our consolidated balance sheets. We will continue to evaluate the recoverability of the carrying amount of our patent-related intangible assets on an ongoing basis, and we may incur substantial impairment charges, which would adversely affect our consolidated financial results. There can be no assurance that the outcome of such reviews in the future will not result in substantial impairment charges. Impairment assessment inherently involves judgment as to assumptions about expected future cash flows and the impact of market conditions on those assumptions. Future events and changing market conditions may impact our assumptions as to prices, costs, holding periods or other factors that may result in changes in our estimates of future cash flows. Although we believe the assumptions we used in testing for impairment are reasonable, significant changes in any one of our assumptions could produce a significantly different result.

Risks Related to Our Common Stock

The availability of shares for sale in the future could reduce the market price of our common stock.

In the future, we may issue securities to raise cash for operations and acquisitions. We may also pay for interests in additional subsidiary companies by using shares of our common stock or a combination of cash and shares of our common stock. We may also issue securities convertible into our common stock. Any of these events may dilute stockholders’ ownership interests in our company and have an adverse impact on the price of our common stock.

In addition, sales of a substantial amount of our common stock in the public market, or the perception that these sales may occur, could reduce the market price of our common stock. This could also impair our ability to raise additional capital through the sale of our securities.

Delaware law and our charter documents contain provisions that could discourage or prevent a potential takeover of our company that might otherwise result in our stockholders receiving a premium over the market price of their shares.

Provisions of Delaware law and our certificate of incorporation and bylaws could make the acquisition of our company by means of a tender offer, proxy contest or otherwise, and the removal of incumbent officers and directors, more difficult. These provisions include:

• Section 203 of the Delaware General Corporation Law, which prohibits a merger with a 15%-or-greater stockholder, such as a party that has completed a successful tender offer, until three years after that party became a 15%-or-greater stockholder;

• amendment of our bylaws by the stockholders requires a two-thirds approval of the outstanding shares;

• the authorization in our certificate of incorporation of undesignated preferred stock, which could be issued without stockholder approval in a manner designed to prevent or discourage a takeover;

• provisions in our bylaws eliminating stockholders’ rights to call a special meeting of stockholders, which could make it more difficult for stockholders to wage a proxy contest for control of our board of directors or to vote to repeal any of the anti-takeover provisions contained in our certificate of incorporation and bylaws; and

• the division of our board of directors into three classes with staggered terms for each class, which could make it more difficult for an outsider to gain control of our board of directors.

Together, these provisions may make the removal of management more difficult and may discourage transactions that could otherwise involve payment of a premium over prevailing market prices for our common stock.

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We may fail to meet market expectations because of fluctuations in quarterly operating results, which could cause the price of our common stock to decline.

Our reported revenues and operating results have fluctuated in the past and may continue to fluctuate significantly from quarter to quarter in the future. It is possible that in future periods, revenues could fall below the expectations of securities analysts or investors, which could cause the market price of our common stock to decline. The following are among the factors that could cause our operating results to fluctuate significantly from period to period:

• the dollar amount of agreements executed in each period, which is primarily driven by the nature and characteristics of the technology being licensed and the magnitude of infringement associated with a specific licensee;

• the specific terms and conditions of agreements executed in each period and the periods of infringement contemplated by the respective payments;

• fluctuations in the total number of agreements executed;

• fluctuations in the sales results or other royalty-per-unit activities of our licensees that impact the calculation of license fees due; 

• the timing of the receipt of periodic license fee payments and/or reports from licensees; 

• fluctuations in the net number of active licensees period to period; 

• costs related to acquisitions, alliances, licenses and other efforts to expand our operations;

• the timing of payments under the terms of any customer or license agreements into which our operating subsidiaries may enter;

• expenses related to, and the timing and results of, patent filings and other enforcement proceedings relating to intellectual property rights, as more fully described in this section; and

• new litigation or developments in current litigation and the unpredictability of litigation results or settlements.

Technology company stock prices are especially volatile, and this volatility may depress the price of our common stock.

The stock market has experienced significant price and volume fluctuations, and the market prices of technology companies have been highly volatile. We believe that various factors may cause the market price of our common stock to fluctuate, perhaps substantially, including, among others, the following:

• announcements of developments in our patent enforcement actions;

• developments or disputes concerning our patents;

• our or our competitors’ technological innovations;

• developments in relationships with licensees;

• variations in our quarterly operating results;

• our failure to meet or exceed securities analysts’ expectations of our financial results;

• a change in financial estimates or securities analysts’ recommendations;

• changes in management’s or securities analysts’ estimates of our financial performance;

• changes in market valuations of similar companies;

• the current sovereign debt crises affecting several countries in the European Union and concerns about sovereign debt of the United States;

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• announcements by us or our competitors of significant contracts, acquisitions, strategic partnerships, joint ventures, capital commitments, new technologies, or patents; and

• failure to complete significant transactions.

      For example, the NASDAQ-100 Technology Sector Index (NDXT) had a range of $1,421.19 - $1,911.53 during the 52-weeks ended December 31, 2013 and the NASDAQ Composite Index (IXIC) had a range of $3,076.60-$4,177.73 over the same period. Over the same period, our common stock fluctuated within a range of $12.23 - $32.59.

The recent financial crisis affecting the banking system and financial markets and the uncertainty in global economic conditions have resulted in a tightening in the credit markets, a low level of liquidity in many financial markets, and extreme volatility in the credit, equity and fixed income markets. As noted above, our stock price, like many others, has fluctuated significantly in recent periods and if investors have concerns that our business, operating results and financial condition will be negatively impacted by global economic conditions, our stock price could continue to fluctuate significantly in future periods.

In addition, we believe that fluctuations in our stock price during applicable periods can also be impacted by court rulings and/or other developments in our patent licensing and enforcement actions. Court rulings in patent enforcement actions are often difficult to understand, even when favorable or neutral to the value of our patents and our overall business, and we believe that investors in the market may overreact, causing fluctuations in our stock prices that may not accurately reflect the impact of court rulings on our business operations and assets.

In the past, companies that have experienced volatility in the market price of their stock have been the objects of securities class action litigation. If our common stock was the object of securities class action litigation, it could result in substantial costs and a diversion of management’s attention and resources, which could materially harm our business and financial results.

ITEM 1B. UNRESOLVED STAFF COMMENTS

None.

ITEM 2. PROPERTIES

Our principal executive, corporate and administrative offices are located in Newport Beach, California, where we lease approximately 20,170 square feet of office space, under a lease agreement that expires in June 2016. Our primary operating subsidiary, Acacia Research Group, LLC, and its subsidiaries, are headquartered in Plano, Texas, where we lease approximately 12,137 square feet of office space, under a lease agreement that expires in June 2020. Certain of our operating subsidiaries also maintain additional leased office space in Carrollton, Texas, Woodcliff Lake, New Jersey, Houston, Texas and Tokyo, Japan. We believe that our facilities are adequate, suitable and of sufficient capacity to support our immediate needs.

ITEM 3. LEGAL PROCEEDINGS

In the ordinary course of business, we are the subject of, or party to, various pending or threatened legal actions, including various counterclaims in connection with our patent enforcement activities. We believe that any liability arising from these actions will not have a material adverse effect on our consolidated financial position, results of operations or cash flows.

In connection with any of our patent enforcement actions, it is possible that a defendant may request and/or a court may rule that we have violated statutory authority, regulatory authority, federal rules, local court rules, or governing standards relating to the substantive or procedural aspects of such enforcement actions. In such event, a court may issue monetary sanctions against us or our operating subsidiaries or award attorney’s fees and/or expenses to a defendant(s), which could be material, and if required to be paid by us or our operating subsidiaries, could materially harm our operating results and our financial position.

ITEM 4. MINE SAFETY DISCLOSURES

None.

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PART II

ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

General

Our common stock trades on The NASDAQ Global Select Market under the symbol “ACTG.” Prior to December 16, 2002, our only class of common stock traded on the NASDAQ National Market System under the symbol “ACRI.”

Price Range of Common Stock

The high and low sales prices for our common stock as reported by The NASDAQ Global Select Market for the periods indicated are shown in the table below. Such prices are inter-dealer prices without retail markups, markdowns or commissions and may not necessarily represent actual transactions.

	2013				2012
	Fourth Quarter	Third Quarter	Second Quarter	First Quarter	Fourth Quarter	Third Quarter	Second Quarter	First Quarter
High	$23.21	$25.74	$30.74	$32.59	$27.80	$40.32	$44.98	$43.82
Low	$12.23	$21.26	$20.37	$24.52	$19.86	$23.24	$32.44	$34.75

Dividend Policy

On April 23, 2013, we announced that our Board of Directors approved the adoption of a cash dividend policy that calls for the payment of an expected total annual cash dividend of $0.50 per common share, payable in the amount of $0.125 per share per quarter. Under the policy, we paid quarterly cash dividends totaling $18.6 million during 2013. In addition, on February 20, 2014, we announced that our Board of Directors approved a fourth quarterly cash dividend payable in the amount of $0.125 per share. The quarterly cash dividend will be paid on March 31, 2014 to shareholders of record at close of business on March 3, 2014. While we paid dividends to holders of our common stock on a quarterly basis during fiscal year 2013, the declaration and payment of future dividends will depend on many factors, including, but not limited to, our earnings and financial condition, and any future dividends will be made solely at the discretion of our Board of Directors.

Holders of Common Stock

On February 25, 2014, there were approximately 125 owners of record of our common stock. The majority of the outstanding shares of our common stock are held by a nominee holder on behalf of an indeterminable number of ultimate beneficial owners.

Purchases of Equity Securities by the Issuer and Affiliated Purchasers

On November 16, 2012, we announced that our Board of Directors authorized a program for repurchases of shares of our outstanding common stock. Under the stock repurchase program, effective November 16, 2012, we were authorized to purchase in the aggregate up to $100 million of our common stock through the period ended August 15, 2013.

On November 15, 2013, Acacia’s Board of Directors authorized a program for repurchases of shares of our outstanding common stock. We were authorized to purchase in the aggregate up to $70 million of our outstanding common stock through the period ending May 14, 2014. Repurchases may be made from time to time by us in the open market or in block purchases in compliance with applicable SEC rules. The following are our monthly stock repurchases for the periods presented, all of which were purchased as part of publicly announced plans or programs:

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	Total Number of Shares Purchased	Average Price paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Approximate Dollar Value of Shares that May Yet be Purchased under  the Plans or Programs		Plan Expiration
Plan Announced November 2012
November 16, 2012 - November 30, 2012	256,262	$	21.58	256,262	$	—	August 15, 2013
December 1, 2012 - December 31, 2012	873,146	$	24.26	873,146	$	—	August 15, 2013
Totals for 2012	1,129,408			1,129,408
Plan Announced November 2013
December 4, 2013 - December 11, 2013	600,000	$	13.18	600,000	$	62,074,000	May 14, 2014
Totals for 2013	600,000			600,000

The repurchases were made using existing cash resources and occurred in the open market.

Stock Price Performance Graph

The following stock price performance graph shall not be deemed “filed” for purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities under that Section and shall not be deemed to be incorporated by reference into any of our filings under the Securities Act.

The Stock Performance Graph depicted below compares the yearly change in our cumulative total stockholder return for the last five fiscal years with the cumulative total return of The NASDAQ Stock Market (U.S.) Composite Index and the NASDAQ-100 Technology Sector Index.

	2009	2010	2011	2012	2013
Acacia Research Corporation common stock	$300	$853	$1,201	$844	$478
Nasdaq Composite Index (IXIC)	$144	$168	$165	$191	$265
NASDAQ-100 Technology Sector Index (NDXT)	$180	$218	$205	$220	$302

The graph covers the period from December 31, 2008 to December 31, 2013. Cumulative total returns are calculated assuming that $100 was invested on December 31, 2008, in our common stock, in the NASDAQ Composite Index, and in the NASDAQ-100 Technology Sector Index, and that all dividends, if any, were reinvested. Stockholder returns over the indicated period should not be considered indicative of future stock prices or shareholder returns.

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ITEM 6. SELECTED FINANCIAL DATA

The consolidated selected balance sheet data as of December 31, 2013 and 2012 and the consolidated selected statements of operations data for the years ended December 31, 2013, 2012 and 2011 set forth below have been derived from our audited consolidated financial statements included elsewhere herein, and should be read in conjunction with those financial statements (including notes thereto). The consolidated selected balance sheet data as of December 31, 2011, 2010 and 2009 and the consolidated selected statements operations data for the years ended December 31, 2010 and 2009 have been derived from audited consolidated financial statements not included herein, but which were previously filed with the SEC.

Consolidated Statements of Operations Data

(In thousands, except share and per share data)

	For the Years Ended December 31,
	2013			2012			2011			2010			2009
Revenues and other operating income(1)	$	130,556		$	250,727		$	184,707		$	131,829		$	67,340
Inventor royalties and contingent legal fees expense(1)	54,508			50,679			91,669			45,198			31,618
Litigation and licensing expenses - patents	39,335			21,591			13,005			13,891			14,055
Amortization of patents	53,658			39,019			9,745			6,931			4,634
Marketing, general and administrative expenses (including non-cash stock compensation expense)	59,229			54,083			35,693			25,067			21,070
Research, consulting and other expenses - business development	3,251			4,943			4,338			2,121			1,689
Operating income (loss)	(82,931		)	80,412			30,257			38,621			(5,726		)
Income (loss) from continuing operations before benefit from (provision for) income taxes	(80,800		)	81,349			30,353			38,756			(5,424		)
Benefit from (provision for) income taxes	21,958			(22,060		)	(8,708		)	(1,740		)	(209		)
Net income (loss) from continuing operations including noncontrolling interests in operating subsidiaries	(58,842		)	59,289			21,645			37,016			(5,633		)
Net income (loss) attributable to Acacia Research Corporation	(56,434		)	59,453			21,106			34,051			(11,290		)
Diluted income (loss) per common share	$	(1.18	)	$	1.21		$	0.50		$	0.95		$	(0.37	)
Cash dividends declared per common share	$	0.375		—			—			—			—

Consolidated Balance Sheet Data (In thousands)

	At December 31,
	2013		2012		2011		2010		2009
Cash and cash equivalents and investments	$	256,702	$	311,279	$	323,286	$	104,516	$	53,887
Total assets	$	593,393	$	668,717	$	352,877	$	134,784	$	78,256
Total liabilities	$	31,195	$	50,239	$	30,765	$	20,931	$	22,287
Noncontrolling interests in operating subsidiaries	$	6,488	$	6,976	$	2,163	$	2,982	$	2,507
Acacia Research Corporation stockholders’ equity	$	555,710	$	611,502	$	319,949	$	110,871	$	53,462

 __________________________________

⁽¹⁾Includes verdict insurance proceeds and related costs as described under “Consolidated Results of Operations” below.

Factors Affecting Comparability:

• As a result of the pre-tax loss for fiscal year 2013, we recorded a benefit from income taxes totaling $22.0 million.

• In fiscal years 2013, 2012, 2011 and 2010, amortization of patents included the acceleration of patent amortization related to recoupable up-front patent portfolio acquisition costs that were recovered, pursuant to the provisions of the underlying inventor agreements, totaling $592,000, $10.6 million and $3.1 million, $1.2 million, respectively. Amortization of patents also included acceleration related to the sale or termination on existing portfolios totaling $1.7 million, $3.0 million, $1,103,000 and $275,000 in fiscal years 2013, 2012, 2011 and 2010, respectively. Included in amortization of patents for the year ended December 31, 2013 are patent impairment charges totaling $4.6 million.

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• Marketing, general and administrative expenses included non-cash stock compensation expense totaling $27.9 million, $25.7 million, $13.6 million, $7.1 million and $7.1 million in 2013, 2012, 2011, 2010 and 2009, respectively.

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ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion should be read in conjunction with our consolidated financial statements included elsewhere in this Annual Report on Form 10-K. This discussion contains forward-looking statements that involve risks and uncertainties. Our actual results could differ materially from those anticipated in these forward-looking statements as a result of various factors including the risks we discuss in Item 1A, “Risk Factors,” and elsewhere herein.

General

Our operating subsidiaries acquire rights in, license and enforce patented technologies. Our operating subsidiaries partner with inventors and patent owners, applying our legal and technology expertise to patent assets to unlock the financial value in their patented inventions. We are an intermediary in the patent marketplace, bridging the gap between invention and application, facilitating efficiency and delivering monetary rewards to patent owners.

Our operating subsidiaries generate revenues and related cash flows from the granting of patent rights for the use of patented technologies that our operating subsidiaries control or own. Our operating subsidiaries assist patent owners with the prosecution and development of their patent portfolios, the protection of their patented inventions from unauthorized use, the generation of licensing revenue from users of their patented technologies and, where necessary, with the enforcement against unauthorized users of their patented technologies through the filing of patent infringement litigation.

We are a leader in licensing patented technologies and have established a proven track record of licensing success with over 1,345 license agreements executed to date, across 166 of our patent licensing and enforcement programs. Currently, on a consolidated basis, our operating subsidiaries own or control the rights to over 200 patent portfolios, which include U.S. patents and certain foreign counterparts, covering technologies used in a wide variety of industries.

The patent acquisition, development, licensing and enforcement business conducted by our operating subsidiaries, is described more fully in Item 1, “Business,” of this annual report.

Executive Overview

During the periods presented, we continued our business of empowering patent owners and rewarding invention by providing a path to patent monetization for the people and companies who have contributed valuable patented inventions to an industry, but who require a professional, experienced independent third-party licensing partner to get rewarded for those inventions. These people and companies are our customers, and in many cases, components of the patent disenfranchised. In so doing, we have placed ourselves at the forefront of an emerging secondary market in patent assets under which holders of high quality patents, including the patent disenfranchised, may be rewarded for the use of their patented inventions by others, even if they do not have the capital and expertise to engage in lengthy, costly and risky patent litigation.

Our operating activities for the periods presented were principally focused on the continued investment in and development of our patent licensing and enforcement business, including the continued pursuit of our ongoing patent licensing and enforcement programs and the commencement of new patent licensing and enforcement programs. In addition, we continued our focus on business development, including the acquisition of several additional high quality patent portfolios by certain of our operating subsidiaries and the continued pursuit of additional opportunities to partner with patent owners or acquire patent portfolios, and continue our industry leading patent licensing and enforcement activities.

Operating activities during the periods presented included the following:

	2013		2012		2011
Revenues and other operating income (in thousands)	$	130,556	$	250,727	$	184,707
New agreements executed	120		138		125
Licensing and enforcement programs generating revenues - during the respective period	53		68		56
Licensing and enforcement programs with initial revenues	23		31		21
New patent portfolios	25		55		40
Cumulative number of licensing and enforcement programs generating revenues - inception to date	166		143		112

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We measure and assess the performance and growth of the patent licensing and enforcement businesses conducted by our operating subsidiaries based on consolidated revenues (including other operating income) recognized across all of our patent licensing and enforcement programs on a trailing twelve-month basis. Trailing twelve-month revenues during the periods presented were as follows (in thousands, except percentage change values):

As of Date:	Trailing Twelve -Month Revenues		% Change
December 31, 2013	$	130,556	(28	)%
September 30, 2013	181,755		(10	)%
June 30, 2013	201,174		(12	)%
March 31, 2013	228,548		(9	)%
December 31, 2012	250,727		36	%
December 31, 2011	184,707		—

Our revenues historically have fluctuated period to period, and can vary significantly, based on a number of factors including the following:

• the dollar amount of agreements executed each period, which can be driven by the nature and characteristics of the technology or technologies being licensed and the magnitude of infringement associated with a specific licensee;

• the specific terms and conditions of agreements executed each period including the nature and characteristics of rights granted, and the periods of infringement or term of use contemplated by the respective payments;

• fluctuations in the total number of agreements executed each period;

• the timing, results and uncertainties associated with patent licensing negotiations, mediations, patent infringement actions, trial dates and other enforcement proceedings relating to our patent licensing and enforcement programs;

• the relative maturity of licensing programs during the applicable periods; and

• other external factors, including the periodic status or results of ongoing negotiations, the status of ongoing litigations, actual or perceived shifts in the regulatory environment, impact of unrelated patent related judicial proceedings and other macroeconomic factors.

Management does not attempt to manage for smooth sequential periodic growth in revenues period to period, and therefore, periodic results can be uneven. Unlike most operating businesses and industries, licensing revenues not generated in a current period are not necessarily foregone but, most likely, depending on whether negotiations, litigation or both continue into subsequent periods, and depending on a number of other factors, such potential revenues may be pushed into subsequent fiscal periods.

Historically, based on the merits and strength of our operating subsidiary’s patent infringement claims and other factors, many prospective licensees have elected to settle significant patent infringement cases and pay reasonable license fees for the use of our patented technology, as those patent infringement cases approached a court determined trial date. In 2013, we had three such trial dates, occurring in the first half of 2013. We believe there is a direct correlation between this relatively low number of trial dates in 2013 and (1) our prospective licensee’s reduced settlement compulsion throughout fiscal 2013, (2) the timing of our revenue generation during fiscal 2013, and (3) consequently, the overall decline in our fiscal 2013 revenue, as compared to fiscal 2012.

Based on current scheduling information available as of February 28th, 2014, the number of trial dates increases to approximately 10 trial dates in fiscal 2014. Based on information available as of February 28th, 2014, in the first half of 2015, we currently expect to have between 10 and 15 trial dates. Many of these trials will involve our higher quality, higher revenue potential patent portfolios. In patent licensing and enforcement, these trial dates, though not perfect predictors of revenue, are closely correlated to potential future revenue events.

Going forward, we have strategically chosen to shift the focus of our operating business to increasingly serve a smaller number of customers each having higher quality patent portfolios. High quality patent portfolios are typically associated with higher numbers of varied defensible claims, higher revenue potential, originating from high-pedigreed patent owners and/or possessing a relatively large number of prospective licensees. In this regard, during the later portion of 2013 and early 2014, we have continued, and even accelerated the shift in our focus at our point of patent intake, from quantity to quality.

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We continue to identify and explore numerous opportunities for partnering with companies in the technology, energy, medical technology and other sectors for the licensing and enforcement of their high quality patented technologies, and are also expanding our activity in international markets, both of which we expect will expand and diversify our future revenue generating opportunities. During fiscal year 2013, we expanded our management team with key hires of experienced patent acquisition and licensing executives from industry that we expect will facilitate our continued development of these growth areas.

Summary of Results of Operations - For Fiscal Years 2013, 2012 and 2011

(In thousands, except percentage change values)

	Fiscal Year									% Change
	2013			2012			2011			2013 vs. 2012		2012 vs. 2011
Revenues	$	130,556		$	250,727		$	172,256		(48	)%	46	%
Verdict insurance proceeds	—			—			12,451			—	%	(100	)%
Total revenues and other operating income	130,556			250,727			184,707			(48	)%	36	%
Inventor royalties and contingent legal fees(3)	54,508			50,679			91,669			8	%	(45	)%
Amortization expense	53,658			39,019			9,745			38	%	300	%
Other operating costs and expenses(1)	105,321			80,617			53,036			31	%	52	%
Operating income (loss)	(82,931		)	80,412			30,257			(203	)%	166	%
Benefit from (provision for) income taxes	21,958			(22,060		)	(8,708		)	(200	)%	153	%
Net loss (income) attributable to noncontrolling interests(2)	2,408			164			(539		)	*		(130	)%
Net income (loss) attributable to Acacia Research Corporation	(56,434		)	59,453			21,106			(195	)%	182	%

* Percentage change in excess of 300%

⁽¹⁾ Includes non-cash stock compensation charges of $27.9 million, $25.7 million and $13.6 million in fiscal years 2013, 2012 and 2011, respectively, included in Marketing, general and administrative expense in the statements of operations.

⁽²⁾ Refer to Note 1 to the notes to consolidated financial statements included elsewhere in this annual report for additional information.

⁽³⁾ Includes inventor royalties and contingent legal fees (fiscal year 2011 only) associated with the verdict insurance policy and related proceeds received, as described below.

Overview - Fiscal year 2013 compared with Fiscal Year 2012

• Revenues decreased $120.2 million, or 48%, due primarily to a decrease in the average revenue per executed agreement and a decrease in the total number of agreements executed in fiscal year 2013.

• In fiscal year 2013, $9.9 million, or 7.6%, of revenues were generated from our patent portfolios in the medical technology industry sector, as compared to $41.2 million, or 16.5%, in fiscal year 2012.

• Cost of Revenues and Other Operating Expenses:

◦ Inventor royalties and contingent legal fees, on a combined basis, increased $3.8 million, or 8%, as compared to the 48% decrease in related revenues for the same periods, due primarily to a greater percentage of revenues generated in fiscal year 2012 having no inventor royalty or contingent legal fee arrangement obligations, and lower average inventor royalty and contingent legal fee rates as compared to the portfolios generating revenues in fiscal year 2013.

◦ Litigation and licensing expenses-patents increased $17.7 million, or 82%, to $39.3 million, due primarily to an increase in international enforcement costs, an increase in strategic patent portfolio prosecution costs, and a net increase in litigation support and third-party technical consulting expenses associated with ongoing and new licensing and enforcement programs commenced during 2013.

◦ Marketing, general and administrative expenses increased $5.1 million, or 10%, to $59.2 million, due primarily to a net increase in personnel costs in connection with the enhancement of our business development, licensing and engineering teams, an increase in other non-recurring personnel severance costs including the impact of non-recurring cash and non-cash charges associated with Paul Ryan’s retirement severance package, approved by the board of directors, and a net increase in corporate legal, facilities, general and administrative costs, partially offset by a decrease in variable performance-based compensation costs.

◦ Patent amortization increased $14.6 million, or 38%, to $53.7 million, due primarily to amortization expense related to new patent portfolios acquired during the fourth quarter of 2012 and a net increase in accelerated

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patent amortization related to patent portfolio impairment charges totaling $4.6 million and other dispositions during fiscal year 2013, partially offset by a decrease in accelerated patent amortization related to recoupable up-front patent portfolio acquisition costs recovered during fiscal year 2013.

◦ We recorded a pre-tax net loss and a tax benefit for fiscal year 2013, compared to pre-tax net income and tax expense for fiscal year 2012, as shown above. Our effective tax rate was 27% for fiscal years 2013 and 2012, respectively. The fiscal year 2013 effective tax benefit rate was lower than the U.S. Federal statutory rate primarily due to an increase in the valuation allowance related to foreign tax credits generated in 2013 and certain permanent nondeductible items. The fiscal year 2012 effective tax rate was lower than the U.S. federal statutory rate primarily due to $10.2 million of tax benefits recognized resulting from the release of valuation allowance on the majority of our net deferred tax assets in the first quarter of 2012, as discussed below.

◦ Operating expenses for fiscal year 2013 included a one-time, non-recurring charge related to the resolution of a dispute concerning legal fees associated with a prior matter totaling $3.5 million.

Overview - Fiscal year 2012 compared with Fiscal Year 2011

• Revenues and other operating income increased $66.0 million, or 36%, due primarily to an increase in the average revenue per executed agreement and an increase in the total number of agreements executed in fiscal year 2012.

• In fiscal year 2012, $41.2 million, or 16.5%, of revenues were generated from our patent portfolios in the medical technology industry sector, as compared to $8.6 million, or 4.7%, in fiscal year 2011.

• Other operating income in fiscal year 2011 includes verdict insurance proceeds totaling $12.5 million, as described below under “Consolidated Results of Operations.”

• Cost of Revenues and Other Operating Expenses:

◦ Inventor royalties, net income attributable to noncontrolling interests, contingent legal fees, and applicable verdict insurance proceeds related costs, on a combined basis, decreased $41.0 million, or 45%, compared to the 36% increase in related revenues and other operating income for the same periods, due primarily to a greater percentage of revenues generated in fiscal year 2012 having no inventor royalty or contingent legal fee arrangement obligations, and lower average inventor royalty and contingent legal fee rates for the portfolios generating revenues in fiscal year 2012.

◦ Litigation and licensing expenses-patents decreased $8.6 million, or 66%, to $21.6 million, due primarily to a higher net level of patent prosecution, litigation support, third-party technical consulting and professional expert expenses associated with our investment in ongoing licensing and enforcement programs and new licensing and enforcement programs commenced since the end of fiscal year 2012.

◦ Marketing, general and administrative expenses increased $18.4 million, or 52% to $54.1 million, due primarily to an increase in non-cash stock compensation charges resulting from an increase in the average grant date fair value of restricted shares expensed and an increase in restricted shares vesting in 2012, a net increase in licensing, business development, and engineering personnel since the end of fiscal year 2011, an increase in variable performance-based compensation costs and a net increase in corporate general and administrative costs.

◦ Patent amortization increased $29.3 million, or 300% to $39.0 million, due primarily to amortization expense related to an increase in amortization related to new patent portfolios acquired in fiscal year 2012 and a net increase in accelerated patent amortization related to recoupable up-front patent portfolio acquisition costs recovered during fiscal year 2012.

◦ Our effective tax rate remained relatively flat at 27% and 29% for fiscal years 2012 and 2011, respectively.

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Revenues in fiscal year 2013 included fees from the following licensing and enforcement programs:

•	3G & 4G Wireless technology(1)	•	Memory Circuit and Packaging technology(1)
•	Audio Communications Fraud Detection technology	•	Messaging technology
•	Automotive Safety, Navigation and Diagnostics technology	•	Mobile Computer Synchronization technology
•	Broadband Communications technology(1)	•	Mobile Enhancement Solutions technology
•	Business Process Modeling technology(2)	•	MRI technology(1)(2)
•	Camera Support technology	•	NOR Flash technology
•	Catheter Ablation technology(1)(2)	•	Online Auction Guarantees technology
•	Computer Aided Design Tools technology(1)	•	Online Gaming technology
•	Computer Architecture and Power Management technology	•	Online newsletters with links technology
•	Core Fiber Optic Network Architectures technology(1)	•	Optical Networking technology(1)(2)
•	Digital Imaging technology(1)	•	Power Management within Integrated Circuits technology
•	Digital Signal Processing Architecture technology	•	Prescription Lens technology(1)(2)
•	DMT® technology	•	Reflective and Radiant Barrier Insulation technology(1)
•	Domain Name Redirection technology	•	Semiconductor Memory and Process technology(1)
•	Dynamic Transmissions technology(1)	•	Semiconductor Packaging technology(1)
•	Electronic spreadsheet, data analysis and software development technology(1)	•	Software Activation technology
•	Facilities Operation Management System technology	•	Surgical Access technology(2)
•	Gas Modulation Control Systems technology(1)	•	Suture Anchors technology(2)
•	Greeting Card technology(1)	•	Telematics technology
•	Improved Memory Manufacturing technology	•	User Programmable Engine Control technology
•	Information Portal Software technology	•	Video Analytics for Security technology
•	Information Storage, Searching & Retrieval technology	•	Video Delivery and Processing technology
•	Inhaler Drug Delivery technology(1)(2)	•	Web Collaboration technology(1)
•	Intercarrier SMS technology(1)	•	Wireless Data Synchronization & Data Transfer technology(1)
•	Interstitial and Pop-Up Internet Advertising technology	•	Wireless Location Based Services technology(1)
•	Lighting Ballast technology	•	X-Ray Powder Diffraction technology(1)
•	Location Based Services technology

Revenues in fiscal year 2012 included fees from the following licensing and enforcement programs:

•	4G Wireless technology(1)	•	Messaging technology
•	Application Authentication technology(1)	•	Minimally Invasive Surgery technology(1)(2)
•	Audio Communications Fraud Detection technology	•	Mobile Computer Synchronization technology
•	Automotive Safety, Navigation and Diagnostics technology(1)	•	Network Monitoring technology
•	Bone Graft Harvesting technology(1)(2)	•	NOR Flash technology
•	Bone Spacer Devices technology(1)(2)	•	Online Ad Tracking technology
•	Bone Wedge technology(1)(2)	•	Online Auction Guarantee technology
•	Camera Support technology	•	Online Gaming technology(1)
•	Consumer Rewards technology(1)	•	Optical Networking technology
•	Data Compression technology	•	Optical Recording technology
•	DDR SDRAM technology	•	Optical Switching technology
•	Digital Signal Processing Architecture technology	•	Pop-up Internet Advertising technology
•	Disk Array Systems & Storage Area Network technology	•	Power Management Within Integrated Circuits technology
•	DMT® technology	•	Power-over-Ethernet technology
•	Document Assembly Technology for Printers(1)	•	Radiation Therapy technology(1)(2)
•	Document Generation technology	•	Rule Based Monitoring technology
•	Domain Name Redirection technology(1)	•	Semiconductor Memory and Process Patents(1)
•	Dynamic Random Access Memory technology(1)	•	Shape Memory Alloys technology(2)
•	Enhanced Mobile Communications technology(1)	•	Software Activation technology(1)

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•	Facilities Operation Management System technology	•	Storage technology
•	Hearing Aid technology(1)(2)	•	Surgical Access technology(1)(2)
•	Impact Instrument technology	•	Suture Anchors technology(1)(2)
•	Improved Anti-Trap Safety Technology for Vehicles(1)	•	Targeted Content Delivery & Network File Transfer technology
•	Improved Lighting technology	•	Telematics technology
•	Improved Memory Manufacturing technology(1)	•	Unicondylar Knee Replacement technology(1)(2)
•	Information Portal Software technology	•	User Programmable Engine Control technology
•	Information Storage, Searching and Retrieval technology(1)	•	Video Analytics for Security technology(1)
•	Integrated Access technology(1)	•	Video Delivery and Processing technology(1)
•	Intraluminal Device technology(1)(2)	•	Video Encoding technology
•	Lighting Ballast technology	•	Videoconferencing technology(1)
•	Location Based Services technology	•	Visual Data Evaluation technology
•	Medical Image Manipulation technology(1)(2)	•	Voice-Over-IP Technology(1)
•	Medical Monitoring technology(2)	•	Website Crawling technology
•	MEMS technology	•	Wireless Monitoring technology(1)(2)

Revenues in fiscal year 2011 included fees from the following licensing and enforcement programs:

•	Audio Communications Fraud Detection technology	•	Magnetic Storage technology(1)
•	Biosensor technology(1)(2)	•	Manufacturing Data Transfer technology
•	Camera Support technology	•	MEMS technology(1)
•	Catheter Insertion technology(1)(2)	•	Messaging technology(1)
•	Computer Architecture and Power Management technology(1)	•	Microprocessor Enhancement technology
•	Computer Graphics technology	•	Mobile Computer Synchronization technology
•	Data Compression technology(1)	•	Network Monitoring technology
•	Database Retrieval technology(1)	•	Network Remote Access technology
•	DDR SDRAM technology(1)	•	NOR Flash technology(1)
•	Digital Signal Processing Architecture technology	•	Online Auction Guarantee technology
•	Digital Video Enhancement technology	•	Optical Recording technology(1)
•	Disk Array Systems & Storage Area Network technology	•	Optical Switching technology
•	DMT® technology	•	Pop-up Internet Advertising technology
•	Document Generation technology(2)	•	Power Management Within Integrated Circuits technology(1)
•	DRAM Memory architecture technology		Power-over-Ethernet technology(1)
•	Electronic Message Advertising technology	•	Rule Based Monitoring technology
•	Facilities Operation Management System technology	•	Semiconductor Manufacture technology(1)
•	High Performance Computer Architecture technology	•	Shape Memory Alloys technology(1)(2)
•	Image Resolution Enhancement technology	•	Short Messaging in Cellular Telephony technology
•	Impact Instrument technology(1)	•	Software Installation technology
•	Improved Commercial Print technology	•	Storage technology
•	Improved Lighting technology	•	Targeted Content Delivery technology(1)
•	Interactive Content in a Cable Distribution System technology(1)	•	Telematics technology
•	Interactive Mapping technology	•	User Programmable Engine Control technology(1)
•	Item Identification technology	•	Video Encoding technology(1)
•	Lighting Ballast technology	•	Virtual Server technology
•	Lighting Control technology(1)	•	Visual Data Evaluation technology
•	Location Based Services technology	•	Website Crawling technology

_________________________________________

(1)	Initial revenues recognized during the applicable period.
(2)	Revenues were generated from our patent portfolios in the medical technology industry sector.

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Although revenues from one or more of our patents or patent portfolios may be significant in a specific reporting period, we believe that none of our individual patents or patent portfolios is individually significant to our licensing and enforcement business as a whole.

Patent Licensing and Enforcement

We expect patent-related legal expenses to continue to fluctuate from period to period based on the factors summarized herein, in connection with future trial dates, international enforcement, strategic patent portfolio prosecution and our current and future patent acquisition, prosecution, licensing and enforcement activities. The pursuit of enforcement actions in connection with our licensing and enforcement programs can involve certain risks and uncertainties, including the following:

• Increases in patent-related legal expenses associated with patent infringement litigation, including, but not limited to, increases in costs billed by outside legal counsel for discovery, depositions, economic analyses, damages assessments, expert witnesses and other consultants, re-exam and inter partes review costs, case-related audio/video presentations and other litigation support and administrative costs could increase our operating costs and decrease our profit generating opportunities;

• Our patented technologies and enforcement actions are complex and, as a result, we may be required to appeal adverse decisions by trial courts in order to successfully enforce our patents;

• New legislation, regulations or rules related to enforcement actions, including any fee or cost shifting provisions, could significantly increase our operating costs and decrease our profit generating opportunities. Increased focus on the growing number of patent-related lawsuits may result in legislative changes which increase our costs and related risks of asserting patent enforcement actions. For instance, the United States House of Representatives passed a bill that would require non-practicing entities that bring patent infringement lawsuits to pay legal costs of the defendants, if the lawsuits are unsuccessful and certain standards are not met;

• Courts may rule that our subsidiaries have violated certain statutory, regulatory, federal, local or governing rules or standards by pursuing such enforcement actions, which may expose us and our operating subsidiaries to material liabilities, which could harm our operating results and our financial position; and

• The complexity of negotiations and potential magnitude of exposure for potential infringers associated with higher quality patent portfolios may lead to increased intervals of time between the filing of litigation and potential revenue events (i.e. markman dates, trial dates), which may lead to increased legal expenses, consistent with the higher revenue potential of such portfolios.

Investments in Patent Portfolios

Our operating subsidiaries intend to sustain the long term growth of our patent licensing and enforcement business through the continued identification of opportunities to partner with patent owners with high-quality patent assets, across a wide range of technology areas that have been, or are anticipated to be, widely adopted by third-parties in connection with the manufacture or sale of products and services. Going forward, we have strategically chosen to shift the focus of the company to increasingly serve a smaller number of customers each having higher quality patent portfolios. In this regard, during the later portion of 2013 and early 2014, we continued, and even accelerated the shift in our focus at our point of patent intake, from quantity to quality.

In fiscal year 2013, we obtained control, primarily through partnering arrangements, of 25 new patent portfolios with applications over a wide range of technology areas, compared to 55 (including the acquisition of ADAPTIX) new patent portfolios, and 40 new patent portfolios in fiscal years 2012 and 2011, respectively. Patent portfolio acquisition costs in fiscal year 2013 totaled $25.1 million, compared to $328.3 million (including the $150.0 million acquisition of ADAPTIX) and $14.7 million in fiscal years 2012 and 2011, respectively.

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Patent portfolio intake in fiscal years 2013, 2012 and 2011 were comprised of the following:

	Number of Patent Portfolios
	2013	%		2012	%		2011	%
Partnering - revenue share with upfront cash advance and preferred returns	18	72	%	25	45	%	7	18	%
Partnering - revenue share with no upfront cash advance	4	16	%	19	35	%	20	50	%
Outright purchase	3	12	%	10	18	%	13	32	%
Acquisition of ADAPTIX, Inc.	—	—	%	1	2	%	—	—	%
	25	100	%	55	100	%	40	100	%

ADAPTIX, Inc. Acquisition. In January 2012, we acquired ADAPTIX, Inc., or ADAPTIX, a pioneer in the development of 4G technologies for wireless systems, for $150 million, net of cash acquired, as described below and at Note 8 to the consolidated financial statements elsewhere herein. With patents filed as early as 2000, ADAPTIX’s research and development efforts have resulted in one of the most significant intellectual property portfolios focused on 4G technologies. With its rapidly growing portfolio of 230 issued and pending patents in 13 countries, ADAPTIX’s innovations extend across a broad range of 4G technologies including OFDMA and MIMO.

In general, the majority of acquisition costs incurred for patent portfolios with future inventor royalty obligations are subject to contractual provisions providing for higher percentage returns to our operating subsidiaries early in the licensing and enforcement program until such initial upfront acquisition costs are fully recovered.

The level of costs incurred in the periods presented in part, reflects our continued identification of opportunities to partner with patent owners, including individual inventors, small technology companies, research laboratories, universities, and major technology companies and exchange upfront and / or advanced royalty payments to patent owners, for no or a reduced future inventor royalty percentages, resulting in the potential for higher returns on our investments in connection with future licensing and enforcement activities.

Fiscal year 2013 patent portfolio intake included the following:

• In January 2013, obtained a patent relating to core fiber optic network architectures.

• In January 2013, obtained rights to a patent portfolio relating to oil and gas production and will share licensing revenue with the patent owner. The portfolio is comprised of 4 U.S. and 27 foreign patents that relate to polymer-based drilling fluids which are widely used in the drilling of oil and gas wells.

• In January 2013, obtained patents relating to vascular device technology.

• In January 2013, obtained patents relating to oil and gas production. The patents relate to solids separation technology which addresses removal of solids from drilling fluids used in oil and gas wells.

• In February 2013, obtained rights to a portfolio of patent assets covering display technologies. The set of patents involved in this transaction relate to certain display technologies used in smartphones, tablets, computers, HDTVs and other devices.

• In April 2013, obtained over 40 issued patents relating to microprocessor and memory technology and will share licensing revenue with the patent owner.

• In April 2013, obtained the rights to an automotive illumination patent portfolio from Rambus Inc., or Rambus (Nasdaq: RMBS), the innovative technology solutions company. The portfolio relates to automotive and vehicular illumination applications including headlights, taillights, and internal and external lighting. As part of this transaction, Rambus received an initial upfront payment and is expected to receive subsequent payments.

• In June 2013, obtained patents for high speed circuit interconnect and display control technology used in consumer electronics, PCs and mobile devices such as smartphones, tablets, and laptops from a major semiconductor technology company.

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• In June 2013, obtained patents for content security used in consumer electronics and mobile devices such as smartphones, tablets, and laptops from a major semiconductor technology company.

• In June 2013, obtained the rights to a patent portfolio covering ink jet printer and ink jet printing technologies.

• In June 2013, obtained the rights to a patent portfolio covering printer and printing technologies.

• In June 2013, obtained U.S. and Canadian patents relating to energy efficiency in commercial and residential building markets. The portfolio broadly covers reflective and radiant barrier insulation technology which dramatically improves heating and cooling efficiency.

• In August 2013, obtained a patent portfolio relating to semiconductor testing technology.

• In August 2013, obtained 13 U.S. and foreign patents and applications on fluorescence microscopy.

• In September 2013, obtained a patent portfolio of over 20 U.S. patents and applications relating to post market sales data, multiple coordinated viewing devices and progressive deletion.

• In September 2013, obtained a patent portfolio relating to power managed security system technology.

• In September 2013, obtained a patent portfolio relating to professional and social media networking technology.

• In November 2013, obtained patents for wideband speech and audio compression technology.

• In November 2013, obtained rights to one issued U.S. patent and U.S. and foreign patent applications relating to methods and systems for performing dynamic, 3-D geological and geophysical modeling used in oil and gas exploration and production.

• In November 2013, obtained U.S. patents and foreign counterparts related to cellular HSPA and LTE technology.

As of December 31, 2013, certain of our operating subsidiaries have entered into option agreements with third-party patent portfolio owners regarding the potential partnering and / or the acquisition of additional patent portfolios for future licensing and enforcement. Future patent portfolio acquisitions will continue to expand and diversify our future revenue generating opportunities.

Acacia Intellectual Property Fund, L.P. In August 2010, one of our wholly owned subsidiaries became the general partner of the Acacia Intellectual Property Fund, L.P., or the Acacia IP Fund, which was formed in August 2010. The Acacia IP Fund is authorized to raise up to $250 million. The Acacia IP Fund acquires, licenses and enforces intellectual property consisting primarily of patents, patent rights, and patented technologies.

Critical Accounting Policies

Our consolidated financial statements are prepared in conformity with accounting principles generally accepted in the United States of America. In preparing these financial statements, we make assumptions, judgments and estimates that can have a significant impact on amounts reported in our consolidated financial statements. We base our assumptions, judgments and estimates on historical experience and various other factors that we believe to be reasonable under the circumstances. Actual results could differ materially from these estimates under different assumptions or conditions. On a regular basis, we evaluate our assumptions, judgments and estimates and make changes accordingly.

We believe that, of the significant accounting policies discussed in Note 2 to our notes to consolidated financial statements, the following accounting policies require our most difficult, subjective or complex judgments:

• revenue recognition;

• stock-based compensation expense;

• valuation of long-lived and intangible assets;

• accounting for business combinations - acquisition method of accounting; and

• accounting for income taxes.

We discuss below the critical accounting assumptions, judgments and estimates associated with these policies. Historically, our assumptions, judgments and estimates relative to our critical accounting policies have not differed materially

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from actual results. For further information on our critical accounting policies, refer to Note 2 to the notes to consolidated financial statements included herein.

Revenue Recognition

As described below, significant management judgments must be made and used in connection with the revenue recognized in any accounting period. Material differences may result in the amount and timing of revenue recognized or deferred for any period, if management made different judgments.

Revenue is recognized when (i) persuasive evidence of an arrangement exists, (ii) all obligations have been performed pursuant to the terms of the agreement, (iii) amounts are fixed or determinable and (iv) collectibility of amounts is reasonably assured.

We make estimates and judgments when determining whether the collectibility of fees receivable from licensees is reasonably assured. We assess the collectibility of fees receivable based on a number of factors, including past transaction history and the credit-worthiness of licensees. If it is determined that collection is not reasonably assured, the fee is recognized when collectibility becomes reasonably assured, assuming all other revenue recognition criteria have been met, which is generally upon receipt of cash for transactions where collectibility may have been an issue. Management’s estimates regarding collectibility impact the actual revenues recognized each period and the timing of the recognition of revenues. Our assumptions and judgments regarding future collectibility could differ from actual events and thus materially impact our financial position and results of operations.

In general, our revenue arrangements provide for the payment of contractually determined fees in consideration for the grant of certain intellectual property rights for patented technologies owned or controlled by our operating subsidiaries. These rights typically include some combination of the following: (i) the grant of a non-exclusive, retroactive and future license to manufacture and/or sell products covered by patented technologies owned or controlled by our operating subsidiaries, (ii) a covenant-not-to-sue, (iii) the release of the licensee from certain claims, and (iv) the dismissal of any pending litigation. The intellectual property rights granted may be perpetual in nature, extending until the expiration of the related patents, or can be granted for a defined, relatively short period of time, with the licensee possessing the right to renew the agreement at the end of each contractual term for an additional minimum upfront payment. Pursuant to the terms of these agreements, our operating subsidiaries have no further obligation with respect to the grant of the non-exclusive retroactive and future licenses, covenants-not-to-sue, releases, and other deliverables, including no express or implied obligation on our operating subsidiaries’ part to maintain or upgrade the technology, or provide future support or services. Generally, the agreements provide for the grant of the licenses, covenants-not-to-sue, releases, and other significant deliverables upon execution of the agreement, or upon receipt of the minimum upfront payment for term agreement renewals. As such, the earnings process is complete and revenue is recognized upon the execution of the agreement, when collectibility is reasonably assured, or upon receipt of the minimum upfront fee for term agreement renewals, and when all other revenue recognition criteria have been met.

Depending on the complexity of the underlying revenue arrangement and related terms and conditions, significant judgments, assumptions and estimates may be required to determine when substantial delivery of contract elements has occurred, whether any significant ongoing obligations exist subsequent to contract execution, whether amounts due are collectible and the appropriate period or periods in which, or during which, the completion of the earnings process occurs. Depending on the magnitude of specific revenue arrangements, if different judgments, assumptions and estimates are made regarding contracts executed in any specific period, our periodic financial results may be materially affected.

Our operating subsidiaries are responsible for the licensing and enforcement of their respective patented technologies and pursue third-parties that are utilizing their intellectual property without a license or who have under-reported the amount of royalties owed under a license agreement. As a result of these activities, from time to time, our operating subsidiaries may recognize revenues in a current period that relate to infringements by licensees that occurred in prior periods. These recoveries may cause revenues to be higher than expected during a particular reporting period and may not occur in subsequent periods. Differences between amounts initially recognized and amounts subsequently audited or reported as an adjustment to those amounts, are recognized in the period such adjustment is determined as a change in accounting estimate.

The economic terms of the inventor agreements, operating agreements and contingent legal fee arrangements associated with the patent portfolios owned or controlled by our operating subsidiaries, if any, including royalty rates, contingent fee rates and other terms, vary across the patent portfolios owned or controlled by our operating subsidiaries. Inventor royalties, noncontrolling interests and contingent legal fees expenses fluctuate period to period, based on the amount of revenues recognized each period, the terms and conditions of revenue agreements executed each period and the mix of specific patent portfolios with varying economic terms and obligations generating revenues each period. Inventor royalties,

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noncontrolling interests and contingent legal fees expenses will continue to fluctuate and may continue to vary significantly period to period, based primarily on these factors.

For fiscal years 2013, 2012 and 2011, the majority of our revenue agreements provided for the payment to us of one-time, paid-up license fees in consideration for the grant of certain intellectual property rights for patented technology rights owned by our operating subsidiaries. These rights were primarily granted on a perpetual basis, extending until the expiration of the underlying patents. Pursuant to the terms of these agreements, our operating subsidiaries have no further obligation with respect to the grant of the non-exclusive licenses, covenants-not-to-sue, releases, and other deliverables, including no express or implied obligation on our operating subsidiaries’ part to maintain or upgrade the technology, or provide future support or services. The agreements provided for the grant of the licenses, covenants-not-to-sue, releases, and other significant deliverables upon execution of the agreement. As such, the earnings process was determined to be complete and revenue was recognized upon the execution of the agreements, when all other revenue recognition criteria were met. Historically, term license agreements have not been a material component of our operating revenues, with the majority of license agreements being paid-up, perpetual license agreements.

During the years ended December 31, 2013, 2012 and 2011, we entered into significant agreements with unrelated third-parties resolving pending patent matters that resulted in the grant of certain intellectual property rights and recognition of revenues, portions of which were not subject to inventor royalty and contingent legal fee arrangements, as well as the grant of licenses from certain of our operating subsidiaries and recognition of revenues that were subject to inventor royalties and contingent legal fee arrangements. Revenues recognized subject to inventor royalties and contingent legal fees are based on a determination by the respective operating subsidiaries. Depending on the magnitude of specific revenue arrangements, if different judgments are made regarding revenues subject to inventor royalties and contingent legal fees in any specific period, our periodic financial results may be materially affected.

Stock-based Compensation Expense

Stock-based compensation payments to employees and non-employee directors are recognized as expense in the statements of operations. The compensation cost for all stock-based awards is measured at the grant date, based on the fair value of the award (determined using a Black-Scholes option pricing model for stock options and intrinsic value on the date of grant for nonvested restricted stock), and is recognized as an expense over the employee’s requisite service period (generally the vesting period of the equity award). Determining the fair value of stock-based awards at the grant date requires significant estimates and judgments, including estimating the market price volatility of our common stock, future employee stock option exercise behavior and requisite service periods.

Stock-based compensation expense is recorded only for those awards expected to vest using an estimated pre-vesting forfeiture rate. As such, we are required to estimate pre-vesting option forfeitures at the time of grant and reflect the impact of estimated pre-vesting option forfeitures on compensation expense recognized. Estimates of pre-vesting forfeitures must be periodically revised in subsequent periods if actual forfeitures differ from those estimates. We consider several factors in connection with our estimate of pre-vesting forfeitures, including types of awards, employee class, and historical pre-vesting forfeiture data. The estimation of stock awards that will ultimately vest requires judgment, and to the extent that actual results differ from our estimates, such amounts will be recorded as cumulative adjustments in the period the estimates are revised. If actual results differ significantly from these estimates, stock-based compensation expense and our results of operations could be materially impacted. Refer to Notes 2 and 11 to our notes to consolidated financial statements included elsewhere herein.

Valuation of Long-lived and Intangible Assets

We review long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Factors we consider important, which could trigger an impairment review, include the following:

• significant underperformance relative to expected historical or projected future operating results;

• significant changes in the manner of our use of the acquired assets or the strategy for our overall business;

• significant negative industry or economic trends;

• significant adverse changes in legal factors or in the business climate, including adverse regulatory actions or assessments; and

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• significant decline in our stock price for a sustained period.

If a potential impairment exists, a calculation is performed to determine the fair value of the long-lived asset. This calculation is based on a valuation model, which considers the estimated future undiscounted cash flows resulting from the use of the asset, and a discount rate commensurate with the risks involved. Third party appraised values may also be used in determining whether impairment potentially exists. The estimated fair value is compared to the long-lived asset’s carrying value to determine whether impairment exists.

Fair value is generally estimated using the “Income Approach,” as described by ASC 820, “Fair Value Measurements and Disclosures,” focusing on the estimated future income-producing capability of the patent portfolios over the remaining economic useful life of the patent portfolios. The underlying premise of this approach is that the value of an asset can be measured by the present worth of the net economic benefit (cash receipts less cash outlays) to be received over the remaining life of the asset. The steps followed in applying this approach include estimating the expected after-tax cash flows attributable to the asset over its remaining life and converting these after-tax cash flows to present value through “discounting.” The discounting process contemplates an estimated rate of return that accounts for both the time value of money and investment risk factors. The cash inflows considered are comprised of an estimate of licensee fees expected to be generated over the remaining estimated economic useful life of the patent portfolio from potential future licensees. Estimated license fees are typically estimated based on a general estimated reasonable royalty rate for the applicable technology applied to estimated market share data for potential future licensees. Estimated cash outflows are based on existing contractual obligations, such as contingent legal fee and inventor royalty obligations, applied to estimated license fee revenues, in addition to other estimates of out-of-pocket expenses associated with a specific patent portfolio’s licensing and enforcement program. The analysis also contemplates consideration of current information about the patent portfolio including, status and stage of litigation, periodic results of the litigation process, strength of the patent portfolio, technology coverage and other pertinent information that could impact future net cash flows.

As described above, in assessing the recoverability of intangible assets, significant judgment is required in connection with estimates of market values, estimates of the amount and timing of future cash flows, and estimates of other factors that are used to determine the fair value of the respective assets. If these estimates or related projections change in future periods, future intangible asset impairment tests may result in charges to earnings.

Accounting for Business Combinations - Acquisition Method of Accounting

Acquisitions are accounted for in accordance with the acquisition method of accounting under Financial Accounting Standards Board, or FASB, ASC Topic 805, “Business Combinations,” or Topic 805. Topic 805 requires, among other things, that identifiable assets acquired and liabilities assumed be recognized at their fair values as of the acquisition date. Under the acquisition method of accounting, the purchase consideration is allocated to the assets acquired, including tangible assets, patents and other identifiable intangible assets and liabilities assumed, based on their estimated fair market values on the date of acquisition. Any excess purchase price after the initial allocation to identifiable net tangible and identifiable intangible assets is assigned to goodwill. Amounts attributable to patents are amortized using the straight-line method over the estimated economic useful life of the underlying patents. Acquisition accounting includes the establishment of a net deferred tax asset or liability resulting from book tax basis differences related to assets acquired and liabilities assumed on the date of acquisition.

We assess fair value for financial statement purposes using a variety of methods, including the use of present value models and may also reference independent analyses. Amounts recorded as intangible assets, including patents and patent rights, are based on assumptions and estimates, as of the date of acquisition, regarding the amount and timing of projected revenues and costs associated with the licensing and enforcement of patents and patent rights acquired, appropriate risk-adjusted discount rates, rates of technology adoption, market penetration, technological obsolescence, product launch timing, the impact of competition or lack of competition in the market place, tax implications and other factors. Also, upon acquisition, based on several of the estimates and assumptions previously described, we determine the estimated economic useful lives of the acquired intangible assets for amortization purposes.

Management is responsible for determining the fair value of the tangible and identifiable intangible assets acquired and liabilities assumed as of the acquisition date, solely for purposes of allocating the purchase price to the assets acquired and liabilities assumed. Fair value measurements can be highly subjective, and it is possible that other professionals for other purposes, applying reasonable judgment and criteria to the same facts and circumstances, could develop and support a range of alternative estimated amounts. Actual results may vary from projected results.

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Accounting for Income Taxes

As part of the process of preparing our consolidated financial statements, we are required to estimate our income taxes in each of the jurisdictions in which we operate. This process involves the estimating of our actual current tax exposure together with assessing temporary differences resulting from differing treatment of items, such as deferred revenue, amortization of intangibles and asset depreciation for tax and accounting purposes. These differences result in deferred tax assets and liabilities, which are included within our consolidated balance sheets. We must then assess the likelihood that our deferred tax assets will be recovered from future taxable income and to the extent we believe that recovery is not likely, we must establish a valuation allowance. To the extent we establish a valuation allowance or increase this allowance in a period, we must include an expense within the tax provision in the consolidated statements of operations.     

Significant management judgment is required in determining our provision for income taxes, our deferred tax assets and liabilities and our valuation allowance. Due to uncertainties related to our ability to utilize certain deferred tax assets in future periods, we have recorded a full valuation allowance against certain of those deferred tax assets totaling $7.6 million as of December 31, 2013. These assets primarily consist of foreign tax credits, capital loss carryforwards, and certain net operating loss carryforwards.

In assessing the need for a valuation allowance, management has considered both the positive and negative evidence available, including but not limited to, estimates of future taxable income and related probabilities, estimates surrounding the character of future income and the timing of realization, consideration of the period over which our deferred tax assets may be recoverable, our recent history of net income and prior history of losses, projected future outcomes, industry and market trends and the nature of existing deferred tax assets. In management’s estimate, any positive indicators, including forecasts of potential future profitability of our businesses, are outweighed by the uncertainties surrounding our estimates and judgments of potential future taxable income, primarily due to uncertainties surrounding the timing of realization of future taxable income and the character of such income in particular future periods (i.e. foreign or domestic). In the event that actual results differ from these estimates or we adjust these estimates should we believe we would be able to realize these deferred tax assets in the future, an adjustment to the valuation allowance would increase income in the period such determination was made. For example, a similar analysis was performed in the first quarter of 2012, resulting in the release of the valuation on the majority of our net deferred tax assets totaling $10.7 million for the year ended December 31, 2012. The release of the valuation allowance contemplated the net deferred tax liability resulting from the acquisition of ADAPTIX in January 2012, which created an additional source of income to utilize against the majority of the existing consolidated net deferred tax assets, and our estimate that certain other deferred tax assets related to foreign tax credits and other state related deferreds were more likely than not realizable in future periods.

Any changes in the judgments, assumptions and estimates associated with our analysis of the need for a valuation allowance in any future periods could materially impact our financial position and results of operations in the periods in which those determinations are made.

Consolidated Results of Operations

Comparison of the Results of Operations for Fiscal Years 2013, 2012 and 2011

Revenues and Other Operating Income

							2013 vs. 2012					2012 vs. 2011
	2013		2012		2011		$ Change			% Change		$ Change			% Change
	(in thousands, except percentages)
Revenues	$	130,556	$	250,727	$	172,256	$	(120,171	)	(48	)%	$	78,471		46	%
Verdict insurance proceeds	—		—		12,451		—			—	%	(12,451		)	(100	)%
	$	130,556	$	250,727	$	184,707	$	(120,171	)	(48	)%	$	66,020		36	%

Revenues.  In general, revenue arrangements provide for the payment of contractually determined fees in consideration for the grant of certain intellectual property rights for patented technologies owned or controlled by our operating subsidiaries. These rights typically include some combination of the following: (i) the grant of a non-exclusive, retroactive and future license to manufacture and/or sell products covered by patented technologies owned or controlled by our operating subsidiaries, (ii) covenants-not-to-sue, (iii) the release of the licensee from certain claims, and (iv) the dismissal of any pending litigation.

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	2013		2012		2011
New revenue agreements executed	120		138		125
Licensing and enforcement programs with initial revenues	23		31		21
Average revenue per agreement (in thousands)	$	1,088	$	1,817	$	1,378

A summary of the main drivers of the change in revenues for the periods presented is as follows:

	2013 vs. 2012			2012 vs. 2011
	(in thousands)
Increase (decrease) in number of agreements executed	$	(32,706	)	$	17,912
Increase (decrease) in average revenue per agreement executed	(87,465		)	60,559
Total	$	(120,171	)	$	78,471

Two licensees individually accounted for 38% and 16%, respectively, of revenues recognized in fiscal year 2013, four licensees individually accounted for 21%, 14%, 10% and 10%, respectively, of revenues recognized in fiscal year 2012, and three licensees individually accounted for 26%, 17% and 15%, respectively, of revenues recognized in fiscal year 2011.

Management does not attempt to manage for smooth sequential periodic growth in revenues, and therefore, periodic results can be uneven. Unlike most operating businesses and industries, licensing revenues not generated in a current period are not necessarily foregone, but most likely, depending on whether negotiations, litigation or both continue into subsequent periods, and depending on a number of other factors, such potential revenues may be pushed into subsequent fiscal periods.

In previous periods, based on the merits of our subsidiary’s patent infringement claims and other factors, many prospective licensees have elected to settle significant patent infringement cases and pay reasonable license fees for the use of our patented technology, as those patent infringement cases approached a court determined trial date. In 2013, we had three such trial dates, occurring in the first half of 2013. We believe there is a direct correlation between this relatively low number of trial dates in 2013 and (1) our prospective licensee’s reduced settlement compulsion throughout fiscal 2013, (2) the timing of our revenue generation during fiscal 2013, and (3) consequently, the overall decline in our 2013 revenue as compared to 2012. The existence of trial dates, though not perfect predictors of revenue, are closely correlated to potential future revenue events.

Other Operating Income - Verdict Insurance Proceeds (Fiscal 2011 only). Our operating subsidiary, received a $12.5 million final judgment stemming from its May 2009 trial verdict and corresponding damages award in its patent infringement lawsuit with Yahoo! Inc. Yahoo! Inc. appealed the verdict, and in April 2011, a three Judge panel of the United States Court of Appeals for the Federal Circuit reversed the District Court’s judgment of infringement in a 2 to 1 decision. As a result of the reversal of the District Court’s judgment, in September 2011, our subsidiary submitted a claim under a specific contingency insurance policy previously purchased and received $12.5 million in verdict insurance proceeds.

Cost of Revenues and Other Operating Income

							2013 vs. 2012				2012 vs. 2011
	2013		2012		2011		$ Change		% Change		$ Change			% Change
	(in thousands, except percentages)
Inventor royalties*	$	29,724	$	26,028	$	46,614	$	3,696	14	%	$	(20,586	)	(44	)%
Contingent legal fees*	24,784		24,651		44,247		133		1	%	(19,596		)	(44	)%
Other verdict insurance related costs	—		—		808		—		—	%	(808		)	(100	)%

*Includes inventor royalties and contingent legal fees associated with the verdict insurance policy and related proceeds received, as described below (fiscal year 2011 only).

Inventor Royalties and Contingent Legal Fees Expense.  The economic terms of patent partnering agreements, operating agreements and contingent legal fee arrangements, associated with the patent portfolios owned or controlled by our operating subsidiaries, if any, including royalty obligations, if any, royalty rates, contingent fee rates and other terms and conditions, vary across the patent portfolios owned or controlled by our operating subsidiaries. In certain instances, we have acquired certain patent portfolios outright without future inventor royalty obligations. These costs fluctuate period to period, based on the amount of revenues recognized each period, the terms and conditions of revenue agreements executed each period

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and the mix of specific patent portfolios with varying economic terms, conditions and obligations generating revenues each period.

Verdict Insurance Proceeds Related Costs. Verdict insurance proceeds related costs include $2.9 million of inventor royalties, $4.0 million of contingent legal fees and $808,000 in other costs associated with the verdict insurance policy and related proceeds received, as described above.

A summary of the main drivers of the change in inventor royalties expense and contingent legal fees expense, in relation to the change in total revenues, for the periods presented, is as follows:

	2013 vs. 2012			% of Prior Period Balance		2012 vs. 2011			% of Prior Period Balance
	(in thousands, except percentage change values)
Increase (decrease) in inventor royalty rates	$	4,499		17	%	$	(6,326	)	(14	)%
Increase (decrease) in total revenues	(26,382		)	(101	)%	18,016			39	%
Decrease (increase) in revenues without inventor royalty obligations	25,579			98	%	(32,276		)	(69	)%
Total change - inventor royalties expense	$	3,696		14	%	$	(20,586	)	(44	)%

	2013 vs. 2012			% of Prior Period Balance		2012 vs. 2011			% of Prior Period Balance
	(in thousands, except percentage change values)
Increase (decrease) in contingent legal fee rates	$	10,355		42	%	$	(30,483	)	(68	)%
Increase (decrease) in total revenues	(13,463		)	(55	)%	16,542			37	%
Decrease (increase) in revenues without contingent legal fee obligations	3,241			14	%	(5,655		)	(13	)%
Total change - contingent legal fees	$	133		1	%	$	(19,596	)	(44	)%

Certain revenue agreements with unrelated third-parties entered into during fiscal 2012 and 2011 resulted in the grant of certain intellectual property rights and recognition of revenues, portions of which were not subject to inventor royalty and contingent legal fee arrangements, as well as the grant of licenses from certain of our operating subsidiaries and recognition of revenues that were subject to inventor royalties and contingent legal fee arrangements. Certain of the revenues recognized subject to inventor royalties and contingent legal fees are based on a determination by the respective operating subsidiaries.

							2013 vs. 2012				2012 vs. 2011
	2013		2012		2011		$ Change		% Change		$ Change		% Change
	(in thousands, except percentages)
Litigation and licensing expenses - patents	$	39,335	$	21,591	$	13,005	$	17,744	82	%	$	8,586	66	%
Amortization of patents	53,658		39,019		9,745		14,639		38	%	29,274		300	%

Litigation and Licensing Expenses - Patents.  Litigation and licensing expenses-patents include patent-related prosecution and enforcement costs incurred by outside patent attorneys engaged on an hourly basis and the out-of-pocket expenses incurred by law firms engaged on a contingent fee basis. Litigation and licensing expenses-patents also includes licensing and enforcement related third-party patent research, development, consulting, and other costs incurred in connection with the licensing and enforcement of patent portfolios. Litigation and licensing expenses-patents fluctuate from period to period based on patent enforcement and prosecution activity associated with ongoing licensing and enforcement programs and the timing of the commencement of new licensing and enforcement programs in each period. 

Fiscal Year 2013 versus 2012. Litigation and licensing expenses-patents increased due primarily to an increase in international enforcement costs, an increase in strategic patent portfolio prosecution costs, and a net increase in litigation support and third-party technical consulting expenses associated with ongoing and new licensing and enforcement programs commenced during fiscal year 2013.

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Fiscal Year 2012 versus 2011. Litigation and licensing expenses-patents increased due primarily to higher net levels of patent prosecution, litigation support, third-party technical consulting and professional expert expenses associated with ongoing licensing and enforcement programs and our investment in new licensing and enforcement programs commenced since the end of the prior year period.

We expect patent-related legal expenses to continue to fluctuate period to period as we incur increased costs related to upcoming scheduled and/or anticipated trial dates, international enforcement activities and strategic patent portfolio prosecution activities over the next several fiscal quarters, as we continue to focus on our investments in these areas.

Amortization of Patents.  The change in amortization expense for the comparable periods presented was due to the following:

	2013 vs. 2012			2012 vs. 2011
	(in thousands)
Amortization of patent portfolios acquired since the end of the prior year	$	1,790		$	5,916
Scheduled amortization related to patent portfolios acquired during the prior year	19,088			(613		)
Accelerated amortization related to recovery of upfront advances	(9,982		)	7,463
Acquisition of Adaptix, Inc.	411			14,577
Patent portfolio dispositions	(1,287		)	1,931
Patent portfolio impairment charges	4,619			—
Total change in patent amortization expense	$	14,639		$	29,274

Patent portfolio impairment charges included in patent amortization expense in the statement of operations totaled $4.6 million in fiscal year 2013. The impairment charges related to certain patent portfolios that management, in the fourth quarter of 2013, determined it would no longer allocate future resources to in connection with the licensing and enforcement of such portfolios, due primarily to potential prior art related complexities in two of the programs and/or the overall determination that future resources would be allocated to other licensing and enforcement programs with higher potential return profiles.

Operating Costs and Expenses

							2013 vs. 2012					2012 vs. 2011
	2013		2012		2011		$ Change			% Change		$ Change		% Change
	(in thousands, except percentages)
Marketing, general and administrative	$	31,335	$	28,426	$	22,114	$	2,909		10	%	$	6,312	29	%
Non-cash stock compensation	27,894		25,657		13,579		2,237			9	%	12,078		89	%
Total marketing, general and administrative expenses	$	59,229	$	54,083	$	35,693	$	5,146		10	%	$	18,390	52	%
Research, consulting and other expenses - business development	3,251		4,943		4,338		(1,692		)	(34	)%	605		14	%

Marketing, General and Administrative Expenses.  Marketing, general and administrative expenses include employee compensation and related personnel costs, including variable performance based compensation and non-cash stock compensation expenses, office and facilities costs, legal and accounting professional fees, public relations, marketing, stock administration, state taxes based on gross receipts and other corporate costs. A summary of the main drivers of the change in marketing, general and administrative expenses for the periods presented, is as follows (in thousands):

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	2013 vs. 2012			2012 vs. 2011
	(in thousands)
Net increase in licensing, business development, engineering related personnel costs and other personnel costs	$	1,715		$	2,083
Variable performance-based compensation costs	(4,019		)	2,728
Corporate, general and administrative costs	2,764			1,222
Non-cash stock compensation expense	414			12,078
Non-recurring CEO retirement and other employee severance costs	1,131			—
Nonrecurring non-cash stock compensation - CEO retirement package	1,823			—
Other	1,318			279
Total change in marketing, general and administrative expenses	$	5,146		$	18,390

The change in non-cash stock compensation expense for fiscal year 2012, as compared to fiscal year 2011, was due primarily to an increase in the average grant date fair value of restricted shares expensed and an increase in the number of restricted shares expensed period to period. Refer to Note 11 to the consolidated financial statements elsewhere herein.

Research, Consulting and Other Expenses - Business Development.  Research, consulting and other expenses include third-party business development related research, development, consulting, and other costs incurred in connection with business development activities. These costs fluctuate period to period based on business development related activities in each period.

Benefit from (Provision for) Income Taxes

	2013			2012			2011
Benefit from (provision for) income taxes (in thousands)	$	21,958		$	(22,060	)	$	(8,708	)
Effective tax rate	27		%	27		%	29		%

Fiscal Year 2013 versus 2012. Excluding the impact of changes in the valuation allowance, our annual effective tax rates for fiscal years 2013 and 2012 were 31% (benefit) and 40% (expense), respectively. In 2013, the rate at which we recorded the tax benefit associated with the pretax loss for the period was reduced from the statutory rate primarily due to certain nondeductible permanent items and expired capital loss carryforwards.  In addition, in fiscal year 2013, we recorded a valuation allowance against foreign tax credits generated in fiscal 2013 totaling $4.6 million, as discussed below, and therefore, did not recognize the related tax benefit in our fiscal 2013 statement of operations. 

We generated pretax income in 2012 resulting in tax expense for the period. The fiscal year 2012 effective tax rate was lower than the U.S. federal statutory rate primarily due to $10.2 million of tax benefits recognized resulting from the release of valuation allowance on the majority of our net deferred tax assets in the first quarter of 2012, as discussed below.

Tax benefit (expense) for fiscal 2013 and 2012 also included the impact of the following:

• For financial reporting purposes, tax expense is calculated without the excess tax benefit related to the exercise and vesting of equity-based incentive awards resulting in higher tax expense for financial reporting purposes. The deductions related to the exercise and vesting of equity-based incentive awards are available to offset taxable income on our consolidated tax returns. Noncash tax expense calculated as a result of excluding excess tax benefits related to the exercise and vesting of equity-based incentive awards from the calculation of tax expense for financial reporting purposes, totaled approximately $13.2 million for fiscal year 2012, and were credited to additional paid-in capital, not taxes payable, as the expense does not reflect cash taxes payable. For the year ended December 31, 2013, we incurred approximately $1.4 million of net “shortfall” (taxable compensation is less than expense for financial reporting purposes) from the exercise and vesting of equity-based incentive awards, which was recorded against our additional paid-in capital pool with no impact to the statement of operations.

• Foreign withholding taxes, totaling $4.6 million and $11.9 million for fiscal years 2013 and 2012, respectively, withheld by the applicable foreign tax authority on revenue agreements executed with third-party licensees domiciled in certain foreign jurisdictions. In general, foreign taxes withheld may be claimed as a deduction on future U.S. corporate income tax returns, or as a credit against future U.S. income tax liabilities, subject to certain limitations. At

39

December 31, 2013, we established a full valuation allowance against the $4.6 million of deferred tax assets related to foreign tax credits generated in fiscal year 2013, due to uncertainty regarding future realizability. The tax provision for fiscal year 2012 provides for the utilization of the foreign taxes withheld as a credit against fiscal year 2012 income tax expense calculated for financial statement purposes.

Fiscal Year 2012 versus 2011. Excluding the impact of changes in the valuation allowance, our effective tax rates for fiscal 2012 and 2011 were 40% and 41%, respectively. The fluctuation in tax expense included the impact of the following:

• Noncash tax expense (resulting from the calculation of tax expense for financial statement purposes as discussed above) calculated without the excess tax benefit related to the exercise and vesting of equity-based incentive awards, totaling approximately $13.2 million and $583,000 for fiscal years 2012 and 2011, respectively, which were credited to additional paid-in capital, not taxes payable.

• Foreign withholding taxes, totaling $11.9 million and $7.6 million for fiscal years 2012 and 2011, respectively, withheld by the applicable foreign tax authority on revenue agreements executed with third party licensees domiciled in certain foreign jurisdictions. The tax provisions for the respective periods provide for the utilization of the foreign taxes withheld as a credit against income tax expense calculated for financial statement purposes.

• As of December 31, 2011, we maintained a full valuation allowance against our net deferred tax assets. The net deferred tax liability resulting from the acquisition of ADAPTIX created an additional source of income to utilize against the majority of our existing consolidated net deferred tax assets. In addition, we estimated that certain other deferred tax assets related to foreign tax credits and other state related deferreds were more likely than not realizable in future periods. Accordingly, the valuation allowance on the majority of our net deferred tax assets was released, resulting in a first quarter 2012 financial statement income tax benefit of approximately $10.7 million.

Inflation

Inflation has not had a significant impact on us or any of our subsidiaries in the current or prior periods.

Liquidity and Capital Resources

General

Our primary sources of liquidity are cash, cash equivalents and investments on hand generated from our operating activities and proceeds from recent equity financings. Refer to “Cash Flows from Financing Activities” below for information

regarding recent equity financings. We retain broad discretion over the use of the net proceeds from recent equity offerings and intend to use the net proceeds for operations and for other general corporate purposes, including, but not limited to, working capital, strategic acquisitions and other transactions.

Our management believes that our cash and cash equivalent balances, investments, anticipated cash flow from operations and other external sources of available credit, will be sufficient to meet our cash requirements through at least March 2015 and for the foreseeable future. We may, however, encounter unforeseen difficulties that may deplete our capital resources more rapidly than anticipated, including those set forth under Item 1A, “Risk Factors”, above. Any efforts to seek additional funding could be made through issuances of equity or debt, or other external financing. However, additional funding may not be available on favorable terms, if at all. The capital and credit markets have experienced extreme volatility and disruption since late 2007 and the volatility and impact of the disruption has continued into 2013. At times during this period, the volatility and disruption has reached unprecedented levels. In several cases, the markets have exerted downward pressure on stock prices and credit capacity for certain issuers, and there can be no assurance that the commercial paper markets will be a reliable source of short-term financing for us. If we fail to obtain additional funding when needed, we may not be able to execute our business plans and our business, conducted by our operating subsidiaries, may suffer.

Cash, Cash Equivalents and Investments

Our consolidated cash, cash equivalents and investments on hand totaled $256.7 million at December 31, 2013, compared to $311.3 million at December 31, 2012. The net change in cash and cash equivalents for the periods presented was comprised of the following (in thousands):

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	2013			2012			2011
Net cash provided by (used in):
Operating activities	$	(3,509	)	$	104,603		$	60,590
Investing activities	(66,059		)	(408,792		)	(23,237		)
Financing activities	(25,551		)	211,260			174,865

Cash Flows from Operating Activities.  Cash receipts from licensees totaled $133.5 million, $243.8 million and $189.9 million in fiscal years 2013, 2012 and 2011, respectively. The fluctuations in cash receipts for the periods presented primarily reflects the corresponding fluctuations in revenues recognized during the same periods, as described above. Cash outflows from operations totaled $137.0 million, $139.2 million and $129.3 million in fiscal years 2013, 2012 and 2011, respectively. The fluctuations in cash outflows for the periods presented reflects the fluctuations in revenue related inventor royalties and contingent legal fees and other operating costs and expenses during the same periods, as discussed above, and the impact of the timing of payments to inventors, attorneys and other vendors.

Cash Flows from Investing Activities. Cash flows from investing activities and related changes were comprised of the following for the periods presented (in thousands):

	2013			2012			2011
Purchase of ADAPTIX, Inc., net of cash acquired	$	—		$	(150,000	)	$	—
Patent acquisition costs	(25,061		)	(178,260		)	(14,680		)
Net purchases of available-for-sale investments	(40,323		)	(80,264		)	(8,367		)
Other	(675		)	(268		)	(190		)
Net cash used in investing activities	$	(66,059	)	$	(408,792	)	$	(23,237	)

Cash Flows from Financing Activities. Cash flows from financing activities and related changes included the following for the periods presented (in thousands):

	2013			2012			2011
Proceeds from sale of common stock, net of issuance costs	$	—		$	218,961		$	175,229
Repurchases of common stock	(7,926		)	(26,732		)	—
Dividends paid to shareholders	(18,633		)	—			—
Distributions to noncontrolling interests - Acacia IP Fund	—			(312		)	(2,897		)
Contributions from noncontrolling interests - Acacia IP Fund	1,920			5,793			1,539
Proceeds from the exercise of stock options	486			340			411
Excess tax benefits (shortfalls) from stock-based compensation	(1,398		)	13,210			583
Net cash provided by financing activities	$	(25,551	)	$	211,260		$	174,865

Stock Repurchase Programs. On November 16, 2012, we announced that our Board of Directors authorized a program for repurchases of shares of our outstanding common stock. Under the stock repurchase program, effective November 16, 2012, we were authorized to purchase in the aggregate up to $100 million of our common stock through the period ended August 15, 2013. This repurchase program expired on August 15, 2013.

On November 15, 2013, our Board of Directors authorized a program for repurchases of shares of our outstanding common stock. We were authorized to purchase in the aggregate up to $70 million of our outstanding common stock through the period ending May 14, 2014. Repurchases may be made from time to time by us in the open market or in block purchases in compliance with applicable SEC rules.

In fiscal year 2013, we acquired 600,000 shares of our common stock at an average price of $13.18. In fiscal year 2012, we acquired 1,129,408 shares of our common stock at an average price of $23.65 per share. Repurchases to date were made using existing cash resources and occurred in the open market.

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Proceeds from the Sale of Common Stock. In February 2012, we raised net proceeds of $219.0 million through the sale of 6,122,449 shares of our common stock at a price of $36.75 per share in a private placement offering with certain institutional accredited investors. The net proceeds will continue to be used to finance future acquisitions of patents, other patent licensing vehicles and companies with patent assets, and for working capital and general corporate purposes.

In March 2011, we completed a public offering of 5,750,000 shares of common stock. The public offering price was $31.50 per share, and the net proceeds to us totaled approximately $175.2 million after deducting underwriting discounts and related offering expenses. We retained broad discretion over the use of the net proceeds from the sale of common stock and intended to use the net proceeds for operations and for other general corporate purposes, including, but not limited to, working capital, strategic acquisitions and other transactions.

Dividends. On April 23, 2013, we announced that our Board of Directors approved the adoption of a cash dividend policy that calls for the payment of an expected total annual cash dividend of $0.50 per common share, payable in the amount of $0.125 per share per quarter. Under the policy, we paid quarterly cash dividends totaling $18.6 million during 2013. In addition, on February 20, 2014, we announced that our Board of Directors approved a fourth quarterly cash dividend payable in the amount of $0.125 per share. The quarterly cash dividend will be paid on March 31, 2014 to shareholders of record at close of business on March 3, 2014. While we paid dividends to holders of our common stock on a quarterly basis during fiscal year 2013, the declaration and payment of future dividends will depend on many factors, including, but not limited to, our earnings and financial condition, and any future dividends will be made solely at the discretion of our Board of Directors.

Working Capital

The primary components of working capital are cash and cash equivalents, accounts receivable, prepaid expenses, accounts payable, accrued expenses, and royalties and contingent legal fees payable. Working capital at December 31, 2013 was $247.7 million, compared to $302.6 million at December 31, 2012.  

Consolidated accounts receivable from licensees decreased to $6.3 million at December 31, 2013, compared to $9.8 million at December 31, 2012. Accounts receivable balances fluctuate based on the timing, magnitude and payment terms associated with revenue agreements executed during the year, and the timing of cash receipts on accounts receivable balances recorded in previous periods. Two licensees individually represented approximately 60% and 22%, respectively, of accounts receivable at December 31, 2013. Three licensees individually represented approximately 34%, 30% and 25%, respectively, of accounts receivable at December 31, 2012.

Consolidated royalties and contingent legal fees payable decreased to $10.4 million at December 31, 2013, compared to $12.5 million at December 31, 2012. Royalties and contingent legal fees payable balances fluctuate based on the magnitude and timing of the execution of related license agreements, the timing of cash receipts for the related license agreements, and the timing of payment of current and prior period royalties and contingent legal fees payable to inventor and outside attorneys, respectively.

The majority of accounts receivable from licensees at December 31, 2013 were collected or scheduled to be collected in the first quarter of 2014, in accordance with the terms of the related underlying license agreements. The majority of royalties and contingent legal fees payable are scheduled to be paid in the first quarter of 2014 in accordance with the underlying contractual arrangements.

Accounts payable and accrued expenses increased to $11.6 million at December 31, 2013, from $9.2 million at December 31, 2012, due primarily to the increase in litigation and licensing expenses-patents described above and the related timing of payments to vendors in the ordinary course.

Off-Balance Sheet Arrangements

We have not entered into off-balance sheet financing arrangements, other than operating leases.

Contractual Obligations

We have no significant commitments for capital expenditures in 2014. We have no committed lines of credit or other committed funding or long-term debt. The following table lists our material known future cash commitments as of December 31, 2013, and any material known commitments arising from events subsequent to year end:

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	Payments Due by Period (In thousands)
	Total		Less than  1 year		1-3 years		More than 3 years
Operating leases	$	5,053	$	1,442	$	2,471	$	1,140
Accrued distributions to noncontrolling interests in operating subsidiary	504		504		—		—
Scheduled patent acquisition related payments	4,000		4,000		—		—
Total contractual obligations	$	9,557	$	5,946	$	2,471	$	1,140

Uncertain Tax Positions. At December 31, 2013, we had total unrecognized tax benefits of approximately $2.1 million, including a recorded noncurrent liability of $85,000, related to unrecognized tax benefits primarily associated with state taxes. No interest and penalties have been recorded for the unrecognized tax benefits as of December 31, 2013. If recognized, approximately $2.1 million would impact our effective tax rate. We do not expect that the liability for unrecognized tax benefits will change significantly within the next 12 months. Activity related to the gross unrecognized tax benefits for the periods presented was as follows (in thousands):

Balance at January 1, 2012	$	85
Additions for tax positions related to prior years	772
Additions resulting from the acquisition of ADAPTIX	1,270
Balance at December 31, 2012	2,127
Reductions	—
Balance at December 31, 2013	$	2,127

Recent Accounting Pronouncements

Refer to Note 2 to our notes to consolidated financial statements included elsewhere herein.

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ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The primary objective of our investment activities is to preserve principal while concurrently maximizing the income we receive from our investments without significantly increasing risk. In addition, we sometimes invest in marketable equity securities for strategic purposes related to our patent monetization-based businesses. Some of the securities that we invest in may be subject to interest rate risk and/or market risk. This means that a change in prevailing interest rates, with respect to interest rate risk, or a change in the value of the United States equity markets, with respect to market risk, may cause the principal amount or market value of the investments to fluctuate. For example, if we hold a security that was issued with a fixed interest rate at the then-prevailing rate and the prevailing interest rate later rises, the current value of the principal amount of our investment may decline. To minimize these risks in the future, we intend to maintain our portfolio of cash equivalents and short-term investments in a variety of securities, including commercial paper, money market funds, high-grade corporate bonds, government and non-government debt securities and certificates of deposit. However, to the extent that our marketable equity securities have strategic value, we typically do not attempt to reduce or eliminate market risk with respect to such securities through hedging activities.

At December 31, 2013 and 2012, our short-term investments were comprised of AAA rated money market funds that invest in first-tier only securities, which primarily include domestic commercial paper, securities issued or guaranteed by the U.S. government or its agencies, U.S. bank obligations, and fully collateralized repurchase agreements (included in cash and cash equivalents in the accompanying consolidated balance sheets), direct investments in highly liquid, AAA, U.S. government securities (included in short term investments in the accompanying consolidated balance sheets), and strategic investments in marketable equity securities (included in short term investments in the accompanying consolidated balance sheet as of December 31, 2012 only).

In general, money market funds are not subject to market risk because the interest paid on such funds fluctuates with the prevailing interest rate. Accordingly, a 100 basis point increase in interest rates or a 10% decline in the value of the United States equity markets would not be expected to have a material impact on the value of such money market funds. Investments in U.S. government fixed income securities are subject to interest rate risk and will decline in value if interest rates increase. However, due to the relatively short duration of our investment portfolio, an immediate 10% change in interest rates would have no material impact on our financial condition, results of operations or cash flows. Declines in interest rates over time will, however, reduce our interest income.

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

The financial statements and related financial information required to be filed hereunder are indexed under Item 15 of this report and are incorporated herein by reference.

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

ITEM 9A. CONTROLS AND PROCEDURES

(a) Conclusion Regarding the Effectiveness of Disclosure Controls and Procedures

Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of our disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act. Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that, as of December 31, 2013, our disclosure controls and procedures were effective to ensure that the information required to be disclosed by us in the reports that we file or submit under the Exchange Act is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure, and that such information is recorded, processed, summarized and reported within the time periods prescribed by the SEC.

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(b) Management’s Report on Internal Control Over Financial Reporting  

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act. Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework in Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on our evaluation under the framework in Internal Control - Integrated Framework, our management concluded that our internal control over financial reporting was effective as of December 31, 2013.

Grant Thornton LLP, the independent registered public accounting firm who audited our consolidated financial statements included in this Annual Report on Form 10-K, has issued a report on our internal control over financial reporting, which is included herein.

Changes in Internal Controls. There were no changes in our internal control over financial reporting during the fourth fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

ITEM 9B. OTHER INFORMATION

None 

PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

Except as provided below, in accordance with General Instruction G(3) to Form 10-K, certain information required by this Item is incorporated herein by reference to our definitive proxy statement to be filed with the SEC no later than April 30, 2014.

Code of Conduct.

We have adopted a Code of Conduct that applies to all employees, including our chief executive officer, chief financial and accounting officer, president and any persons performing similar functions. Our Code of Conduct is provided on our internet website at www.acaciaresearch.com.

ITEM 11. EXECUTIVE COMPENSATION

In accordance with General Instruction G(3) to Form 10-K, the information required by this Item is incorporated herein by reference to our definitive proxy statement to be filed with the SEC no later than April 30, 2014.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

In accordance with General Instruction G(3) to Form 10-K, certain information required by this Item is incorporated herein by reference to our definitive proxy statement to be filed with the SEC no later than April 30, 2014.

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Equity Compensation Plan Information

The following table provides information with respect to shares of our common stock issuable under our equity compensation plans as of December 31, 2013:

Plan Category	(a) Number of securities to be issued upon exercise of outstanding options	(b) Weighted-average exercise price of outstanding options		(c) Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a))
Equity compensation plans approved by security holders
2002 Acacia Technologies Stock Incentive Plan(1)	195,000	$	6.91	—
2007 Acacia Technologies Stock Incentive Plan(2)	—	—		—
2013 Acacia Research Stock Incentive Plan(3)	—	—		3,971,000
Subtotal	195,000	$	6.91	3,971,000
Equity compensation plans not approved by security holders
Grants to New Employees Outside of the Plans(4)	—	—		—
Total	195,000	6.91		3,971,000

____________________

(1) The 2002 Stock Plan expired in December 2012. Column (a) excludes 630,000 in nonvested restricted stock awards and restricted stock units outstanding at December 31, 2013. Refer to Note 11 to our notes to consolidated financial statements included elsewhere herein.

(2) The initial share reserve under the 2007 Acacia Technologies Stock Incentive Plan, or the 2007 Plan, was 560,000 shares of our common stock. The share reserve under the 2007 Plan automatically increased on January 1, 2008 and 2009, by an amount equal to two percent (2%) of the total number of shares of our common stock outstanding on the last trading day of December in the prior calendar year. After January 1, 2009, no new additional shares will be added to the 2007 Plan without security holder approval (except for shares subject to outstanding awards that are forfeited or otherwise returned to the 2007 Plan). Column (a) excludes 12,000 in nonvested restricted stock awards and restricted stock units outstanding at December 31, 2013. Refer to Note 11 to our notes to consolidated financial statements included elsewhere herein.

(3) The initial share reserve under the 2013 Acacia Research Stock Incentive Plan, or the 2013 Plan, was 4,750,000 shares of our common stock. No new additional shares will be added to the 2013 Plan without security holder approval (except for shares subject to outstanding awards that are forfeited or otherwise returned to the 2013 Plan). Column (a) excludes 655,000 in nonvested restricted stock awards and restricted stock units outstanding at December 31, 2013. Refer to Note 11 to our notes to consolidated financial statements included elsewhere herein.

(4) Column (a) excludes 54,000 in nonvested restricted stock awards outstanding at December 31, 2013 that were granted to new employees outside of existing approved plans, pursuant to and in accordance with applicable SEC guidelines. Refer to Note 11 to our notes to consolidated financial statements included elsewhere herein.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

In accordance with General Instruction G(3) to Form 10-K, the information required by this Item is incorporated herein by reference to our definitive proxy statement to be filed with the SEC no later than April 30, 2014.

ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES

In accordance with General Instruction G(3) to Form 10-K, the information required by this Item is incorporated herein by reference to our definitive proxy statement to be filed with the SEC no later than April 30, 2014.

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PART IV

ITEM 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES

(a) The following documents are filed as part of this report.

(1)  Financial Statements	Page
Acacia Research Corporation Consolidated Financial Statements
Reports of Independent Registered Public Accounting Firm	F- 1
Consolidated Balance Sheets as of December 31, 2013 and 2012	F- 3
Consolidated Statements of Operations for the Years Ended December 31, 2013, 2012 and 2011	F- 4
Consolidated Statements of Comprehensive Income (Loss) for the Years Ended December 31, 2013, 2012 and 2011	F- 5
Consolidated Statements of Stockholders’ Equity for the Years Ended December 31, 2013, 2012 and 2011	F- 6
Consolidated Statements of Cash Flows for the Years Ended December 31, 2013, 2012 and 2011	F- 8
Notes to Consolidated Financial Statements	F- 9
(2)   Financial Statement Schedules
Financial statement schedules are omitted because they are not applicable or the required information is shown in the Financial Statements or the Notes thereto.
(3)  Exhibits
Refer to Item 15(b) below.

(b)  Exhibits.  The following exhibits are either filed herewith or incorporated herein by reference:

Exhibit Number	Description
2.1	Agreement and Plan of Merger, dated November 22, 2011, by and among Acacia Research Group LLC, Apollo Patent Corp., Adaptix, Inc., and Baker Communications Fund II (QP), L.P., solely in its capacity as representative for the shareholders of Adaptix, Inc.(15)
3.1	Amended and Restated Certificate of Incorporation (1)
3.2	Amended and Restated Bylaws (17)
10.1*	Acacia Research Corporation 1996 Stock Option Plan, as amended (2)
10.2*	Form of Option Agreement constituting the Acacia Research Corporation 1996 Executive Stock Bonus Plan (3)
10.3*	2002 Acacia Technologies Stock Incentive Plan (4)
10.4*	2007 Acacia Technologies Stock Incentive Plan (5)
10.5*	Form of Acacia Technologies Stock Option Agreement for the 2007 Acacia Technologies Stock Incentive Plan (6)
10.6*	Form of Acacia Technologies Stock Issuance Agreement for the 2002 Acacia Technologies Stock Incentive Plan (6)
10.7*	Form of Acacia Technologies Stock Issuance Agreement for the 2007 Acacia Technologies Stock Incentive Plan (6)
10.8	Office Space Lease dated January 28, 2002, between Acacia Research Corporation and The Irvine Company (7)
10.9	Form of Indemnification Agreement (8)
10.10	Third Amendment to Lease dated January 28, 2002 between Acacia Research Corporation and the Irvine Company (9)

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10.11*	Employment Agreement, dated April 12, 2004, by and between Acacia Media Technologies Corporation and Edward Treska (10)
10.11.1*	Addendum, dated March 31, 2008, to Employment Agreement by and between Acacia Media Technologies Corporation and Edward Treska (11)
10.12	Fourth Amendment to Lease dated January 28, 2002 between Acacia Research Corporation and the Irvine Company (10)
10.13	Fifth Amendment to Lease dated January 28, 2002 between Acacia Research Corporation and the Irvine Company (10)
10.14*	Employment Agreement, dated March 31, 2008, by and between Acacia Technologies, LLC and Paul Ryan (12)
10.14.1*	Amendment to Employment Agreement, dated December 17, 2008, by and between Acacia Technologies, LLC and Paul Ryan (12)
10.15*	Employment Agreement, dated March 31, 2008, by and between Acacia Technologies, LLC and Robert L. Harris (11)
10.15.1*	Amendment to Employment Agreement, dated December 17, 2008, by and between Acacia Technologies, LLC and Robert L. Harris (12)
10.16*	Amended Employment Agreement, dated March 31, 2008, by and between Acacia Technologies, LLC and Clayton J. Haynes (11)
10.16.1*	Amendment to Amended Employment Agreement, dated December 17, 2008, by and between Acacia Technologies, LLC and Clayton J. Haynes (12)
10.17*	Acacia Research Corporation Amended and Restated Executive Severance Policy (12)
10.18	Sixth Amendment to Lease dated January 28, 2002 between Acacia Research Corporation and the Irvine Company (14)
10.19	Form of Purchase Agreement (16)
10.20*	2013 Acacia Research Corporation Stock Incentive Plan (18)
10.21*	Form of Stock Issuance Agreement to be used under the 2013 Acacia Research Corporation Stock Incentive Plan (19)
10.22*	Employment Agreement, dated October 28, 2006, by and between Acacia Technologies Services Corporation and Matthew Vella (20)
18.1	Preferability Letter dated February 25, 2010 from Grant Thornton LLP, independent registered public accounting firm, regarding change in accounting principle (13)
21.1	List of Subsidiaries
23.1	Consent of Independent Registered Public Accounting Firm
24.1	Power of Attorney (included in the signature page hereto).
31.1	Certification of Chief Executive Officer Pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934
31.2	Certification of Chief Financial Officer Pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934
32.1	Certification of Chief Executive Officer Pursuant to Rule 13a-14(b)/15d-14(b) of the Securities Exchange Act of 1934 and 18 U.S.C. Section 1350
32.2	Certification of Chief Financial Officer Pursuant to Rule 13a-14(b)/15d-14(b) of the Securities Exchange Act of 1934 and 18 U.S.C. Section 1350
101	Interactive Date Files Pursuant to Rule 405 of Regulation S-T.

 ___________________________

* The referenced exhibit is a management contract, compensatory plan or arrangement required to be filed as an exhibit to this Annual Report on Form 10-K pursuant to Item 15(c) of Form 10-K.

(1) Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on June 5, 2008 (File No. 000-26068).

(2) Incorporated by reference to Appendix A to Acacia Research Corporation’s Definitive Proxy Statement on Schedule 14A filed on April 20, 2000 (File No. 000-26068).

(3) Incorporated by reference to Appendix A to Acacia Research Corporation’s Definitive Proxy Statement on Schedule 14A filed on April 26, 1996 (File No. 000-26068).

48

(4) Incorporated by reference to Annex E to the Proxy Statement/Prospectus which formed part of Acacia Research Corporation’s Registration Statement on Form S-4 (File No. 333-87654) which became effective on November 8, 2002.

(5) Incorporated by reference to Acacia Research Corporation’s Registration Statement on Form S-8 (File No. 333-144754) which became effective on July 20, 2007.

(6) Incorporated by reference to Acacia Research Corporation’s Quarterly Report on Form 10-Q for the period ended September 30, 2007, filed on November 2, 2007 (File No. 000-26068).

(7) Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10‑K for the year ended December 31, 2001, filed on March 27, 2002 (File No. 000‑26068).

(8) Incorporated by reference to Acacia Research Corporation’s Quarterly Report on Form 10-Q for the period ended June 30, 2012, filed on July 30, 2012 (File No. 000-26068).

(9) Incorporated by reference to Acacia Research Corporation’s Quarterly Report on Form 10-Q for the period ended March 31, 2006, filed on May 10, 2006 (File No. 000‑26068).

(10) Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10-K for the year ended December 31, 2007, filed on March 14, 2008 (File No. 000-26068).

(11) Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on April 2, 2008 ( File No. 000-26068).

(12) Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10-K for the year ended December 31, 2008, filed on February 26, 2009 (File No. 000-26068).

(13) Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10-K for the year ended December 31, 2009, filed on February 26, 2010, as amended on March 1, 2010 (File No. 000-26068)

(14) Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10-K for the year ended December 31, 2010, filed on February 28, 2011, as amended on March 24, 2011 (File No. 000-26068).

(15) Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K/A filed on January 19, 2012 (File No. 000-26068). Portions of this exhibit have been omitted pursuant to a request for confidential treatment under Rule 24-b-2 of the Securities Exchange Act of 1934, as amended. The omitted material has been separately filed with the Securities and Exchange Commission.

(16) Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on February 16, 2012 (File No. 000-26068).

(17) Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10-K for the year ended December 31, 2012, filed on February 28, 2013 (File No. 000-26068).

(18) Incorporated by reference to Appendix A to Acacia Research Corporation’s Definitive Proxy Statement on Schedule 14A filed on April 24, 2013 (File No. 000-26068).

(19) Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on May 22, 2013 (File No. 000-26068).

(20) Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on July 5, 2013 (File No. 000-26068).

49

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.

			ACACIA RESEARCH CORPORATION
Dated:	March 3, 2014	By:	/s/ Matthew Vella
			Matthew Vella
			Chief Executive Officer  (Authorized Signatory)

POWER OF ATTORNEY

We, the undersigned directors and officers of Acacia Research Corporation, do hereby constitute and appoint Matthew Vella and Clayton J. Haynes, and each of them, as our true and lawful attorneys-in-fact and agents with power of substitution, to do any and all acts and things in our name and behalf in our capacities as directors and officers and to execute any and all instruments for us and in our names in the capacities indicated below, which said attorney-in-fact and agent may deem necessary or advisable to enable said corporation to comply with the Securities Exchange Act of 1934, as amended, and any rules, regulations and requirements of the Securities and Exchange Commission, in connection with this Annual Report on Form 10-K, including specifically but without limitation, power and authority to sign for us or any of us in our names in the capacities indicated below, any and all amendments hereto; and we do hereby ratify and confirm all that said attorney-in-fact and agent, shall do or cause to be done by virtue hereof.

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

Signature		Title	Date
/s/	Matthew Vella	Chief Executive Officer	March 3, 2014
	Matthew Vella	(Principal Executive Officer)
/s/	Robert L. Harris, II	Executive Chairman	March 3, 2014
	Robert L. Harris, II
/s/	Clayton J. Haynes	Chief Financial Officer and Treasurer	March 3, 2014
	Clayton J. Haynes	(Principal Financial and Accounting Officer)
/s/	Fred A. de Boom	Director	March 3, 2014
	Fred A. de Boom
/s/	Edward W. Frykman	Director	March 3, 2014
	Edward W. Frykman
/s/	G. Louis Graziadio, III	Director	March 3, 2014
	G. Louis Graziadio, III
/s/	William S. Anderson	Director	March 3, 2014
	William S. Anderson

50

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Board of Directors and Stockholders

Acacia Research Corporation

We have audited the accompanying consolidated balance sheets of Acacia Research Corporation (the “Company”) as of December 31, 2013 and 2012, and the related consolidated statements of operations, comprehensive income (loss), stockholders’ equity, and cash flows for each of the three years in the period ended December 31, 2013.These financial statements are the responsibility of the Company’s management.Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States).Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement.An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements.An audit also includes assessing 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.

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of Acacia Research Corporation as of December 31, 2013 and 2012, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2013 in conformity with accounting principles generally accepted in the United States of America.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Company’s internal control over financial reporting as of December 31, 2013, based on criteria established in the 1992 Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated March 3, 2014 expressed an unqualified opinion.

/s/ GRANT THORNTON LLP

Los Angeles, California

March 3, 2014

F- 1

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Board of Directors and Stockholders

Acacia Research Corporation

We have audited the internal control over financial reporting of Acacia Research Corporations (the “Company”) as of December 31, 2013, based on criteria established in the 1992 Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). 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 Acacia Research Corporation’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). 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.

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.

In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2013, based on criteria established in the 1992 Internal Control-Integrated Framework issued by COSO.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated financial statements of the Company as of and for the year ended December 31, 2013, and our reported dated March 3, 2014 expressed an unqualified opinion on those financial statements.

/s/ GRANT THORNTON LLP

Los Angeles, California

March 3, 2014

F- 2

ACACIA RESEARCH CORPORATION

CONSOLIDATED BALANCE SHEETS

As of December 31, 2013 and 2012

(In thousands, except share and per share information)

	December 31, 2013			December 31, 2012
ASSETS
Current assets:
Cash and cash equivalents	$	126,685		$	221,804
Short-term investments	130,017			89,475
Accounts receivable	6,341			9,843
Deferred income tax	3,139			1,014
Prepaid expenses and other current assets	7,546			2,427
Total current assets	273,728			324,563
Property and equipment, net of accumulated depreciation and amortization	766			339
Patents, net of accumulated amortization	288,432			313,529
Goodwill	30,149			30,149
Other assets	318			137
	$	593,393		$	668,717
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable and accrued expenses	$	11,555		$	9,235
Accrued patent acquisition costs	4,000			250
Royalties and contingent legal fees payable	10,447			12,508
Total current liabilities	26,002			21,993
Deferred income taxes	4,874			27,831
Other liabilities	319			415
Total liabilities	31,195			50,239
Commitments and contingencies (Note 12)
Stockholders’ equity:
Preferred stock, par value $0.001 per share; 10,000,000 shares authorized; no shares issued or outstanding	—			—
Common stock, par value $0.001 per share; 100,000,000 shares authorized; 49,385,057 shares issued and outstanding as of December 31, 2013 and 49,160,844 shares issued and outstanding as of December 31, 2012	49			49
Treasury stock, at cost, 1,729,408 shares as of December 31, 2013 and 1,129,408 shares as of December 31, 2012	(34,640		)	(26,731		)
Additional paid-in capital	653,314			644,982
Accumulated comprehensive loss	(947		)	(1,166		)
Accumulated deficit	(62,066		)	(5,632		)
Total Acacia Research Corporation stockholders’ equity	555,710			611,502
Noncontrolling interests in operating subsidiaries	6,488			6,976
Total stockholders’ equity	562,198			618,478
	$	593,393		$	668,717

The accompanying notes are an integral part of these consolidated financial statements.

F- 3

ACACIA RESEARCH CORPORATION

CONSOLIDATED STATEMENTS OF OPERATIONS

For the Years Ended December 31, 2013, 2012 and 2011

(In thousands, except share and per share information)

	2013			2012			2011
Revenues	$	130,556		$	250,727		$	172,256
Operating costs and expenses:
Cost of revenues:
Inventor royalties	29,724			26,028			43,727
Contingent legal fees	24,784			24,651			40,281
Litigation and licensing expenses - patents	39,335			21,591			13,005
Amortization of patents	53,658			39,019			9,745
Verdict insurance proceeds	—			—			(12,451		)
Verdict insurance proceeds related costs	—			—			7,661
Marketing, general and administrative expenses (including non-cash stock compensation expense of $27,894 in 2013, $25,657 in 2012 and $13,579 in 2011)	59,229			54,083			35,693
Research, consulting and other expenses - business development	3,251			4,943			4,338
Other	3,506			—			—
Total operating costs and expenses	213,487			170,315			141,999
Operating income (loss)	(82,931		)	80,412			30,257
Other income (expense):
Other income	—			500			—
Interest income	1,938			825			81
Write off of investment	—			(45		)	—
Gain (loss) on investment	193			(343		)	15
Total other income (expense)	2,131			937			96
Income (loss) from operations before benefit from (provision for) income taxes	(80,800		)	81,349			30,353
Benefit from (provision for) income taxes	21,958			(22,060		)	(8,708		)
Net income (loss) including noncontrolling interests in operating subsidiaries	(58,842		)	59,289			21,645
Net loss (income) attributable to noncontrolling interests in operating subsidiaries	2,408			164			(539		)
Net income (loss) attributable to Acacia Research Corporation	$	(56,434	)	$	59,453		$	21,106
Net income (loss) attributable to common stockholders - basic	$	(56,945	)	$	57,564		$	20,265
Net income (loss) attributable to common stockholders - diluted	$	(56,945	)	$	57,577		$	20,273
Basic income (loss) per common share	$	(1.18	)	$	1.22		$	0.51
Diluted income (loss) per common share	$	(1.18	)	$	1.21		$	0.50
Weighted-average number of shares outstanding, basic	48,155,832			47,251,061			39,743,433
Weighted-average number of shares outstanding, diluted	48,155,832			47,584,120			40,150,600
Cash dividends declared per common share	$	0.375		—			—

The accompanying notes are an integral part of these consolidated financial statements.

F- 4

ACACIA RESEARCH CORPORATION

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

For the Years Ended December 31, 2013, 2012 and 2011

(In thousands)

	2013			2012		2011
Net income (loss) attributable to Acacia Research Corporation	$	(56,434	)	$	59,453	$	21,106
Other comprehensive income (loss):
Unrealized gain (loss) on short-term investments, net of tax of $0	26			657		(1,830		)
Unrealized gain on foreign currency translation, net of tax of $0	—			7		—
Add: reclassification adjustment for losses included in net income	193			277		—
Total other comprehensive income (loss)	(56,215		)	60,394		19,276
Comprehensive income attributable to noncontrolling interests	—			—		—
Comprehensive income (loss) attributable to Acacia Research Corporation	$	(56,215	)	$	60,394	$	19,276

The accompanying notes are an integral part of these consolidated financial statements.

F- 5

ACACIA RESEARCH CORPORATION

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

For the Years Ended December 31, 2013, 2012 and 2011

(In thousands, except share information)

	Common Shares		Common Stock			Treasury Stock			Additional Paid-in Capital		Other Comprehensive (Loss) Income			Accumulated Deficit			Noncontrolling Interests in Operating Subsidiaries			Total
Balance at December 31, 2010	36,029,068		$	36		$	—		$	197,026	$	—		$	(86,191	)	$	2,982		$	113,853
2011
Net income attributable to Acacia Research Corporation	—		—			—			—		—			21,106			—			21,106
Sale of common stock, net of issuance costs of $5,896	5,750,000		6			—			175,223		—			—			—			175,229
Stock options exercised	87,068		—			—			411		—			—			—			411
Compensation expense relating to stock options and restricted stock awards	1,061,865		1			—			13,578		—			—			—			13,579
Excess tax benefits from stock-based compensation	—		—			—			583		—			—			—			583
Net income attributable to noncontrolling interests in operating subsidiaries	—		—			—			—		—			—			539			539
Contributions from noncontrolling interests in operating subsidiary, net	—		—			—			—		—			—			1,539			1,539
Distributions to noncontrolling interests in operating subsidiary	—		—			—			—		—			—			(2,897		)	(2,897		)
Unrealized loss on short-term investments	—		—			—			—		(1,830		)	—			—			(1,830		)
Balance at December 31, 2011	42,928,001		43			—			386,821		(1,830		)	(65,085		)	2,163			322,112
2012
Net income attributable to Acacia Research Corporation	—		—			—			—		—			59,453			—			59,453
Sale of common stock, net of issuance costs of $6,039	6,122,449		6			—			218,955		—			—			—			218,961
Repurchase of common stock	(1,129,408	)	(1		)	(26,731		)	—		—			—			—			(26,732		)
Stock options exercised	71,272		—			—			340		—			—			—			340
Compensation expense relating to stock options and restricted stock awards	1,168,530		1			—			25,656		—			—			—			25,657
Excess tax benefits from stock-based compensation	—		—			—			13,210		—			—			—			13,210
Net loss attributable to noncontrolling interests in operating subsidiaries	—		—			—			—		—			—			(164		)	(164		)
Contributions from noncontrolling interests in operating subsidiary, net	—		—			—			—		—			—			5,793			5,793
Distributions to noncontrolling interests in operating subsidiary	—		—			—			—		—			—			(816		)	(816		)
Unrealized gain on foreign currency translation	—		—			—			—		7			—			—			7
Unrealized gain on short-term investments	—		—			—			—		657			—			—			657
Balance at December 31, 2012	49,160,844		49			(26,731		)	644,982		(1,166		)	(5,632		)	6,976			618,478
(Continued on next page)

F- 6

ACACIA RESEARCH CORPORATION
CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Continued)
For the Years Ended December 31, 2013, 2012 and 2011
(In thousands, except share information)
	Common Shares		Common Stock			Treasury Stock			Additional Paid-in Capital			Other Comprehensive (Loss) Income			Accumulated Deficit			Noncontrolling Interests in Operating Subsidiaries			Total
2013
Net loss attributable to Acacia Research Corporation	—		—			—			—			—			(56,434		)	—			(56,434		)
Dividends paid to shareholders	—		—			—			(18,633		)	—			—			—			(18,633		)
Repurchase of common stock	(600,000	)	(1		)	(7,909		)	—			—			—			—			(7,910		)
Repurchase of restricted common stock	(666	)	—			—			(16		)										(16		)
Stock options exercised	115,346		—			—			486			—			—			—			486
Compensation expense relating to stock options and restricted stock awards	709,533		1			—			27,893			—			—			—			27,894
Excess tax benefits from stock-based compensation	—		—			—			(1,398		)	—			—			—			(1,398		)
Net loss attributable to noncontrolling interests in operating subsidiaries	—		—			—			—			—			—			(2,408		)	(2,408		)
Contributions from noncontrolling interests in operating subsidiary, net	—		—			—			—			—			—			1,920			1,920
Unrealized gain on short-term investments	—		—			—			—			219			—			—			219
Balance at December 31, 2013	49,385,057		$	49		$	(34,640	)	$	653,314		$	(947	)	$	(62,066	)	$	6,488		$	562,198

The accompanying notes are an integral part of these consolidated financial statements.

F- 7

ACACIA RESEARCH CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

For the Years Ended December 31, 2013, 2012 and 2011

 (In thousands)

	2013			2012			2011
Cash flows from operating activities:
Net income (loss) including noncontrolling interests in operating subsidiaries	$	(58,842	)	$	59,289		$	21,645
Adjustments to reconcile net income (loss) including noncontrolling interests in operating subsidiaries to net cash provided by (used in) operating activities:
Depreciation and amortization	53,894			39,168			9,850
Non-cash stock compensation	27,894			25,657			13,579
Excess tax benefits from stock-based compensation	1,398			(13,210		)	(583		)
Change in valuation allowance on net deferred tax assets	2,189			(10,651		)	—
Other	12			777			(15		)
Changes in assets and liabilities:
Accounts receivable	3,502			(6,928		)	5,072
Prepaid expenses and other assets	(5,300		)	(1,294		)	1,075
Accounts payable and accrued expenses / costs	1,076			16,249			(781		)
Royalties and contingent legal fees payable	(2,061		)	(11,000		)	10,748
Deferred income tax	(27,271		)	6,546			—
Net cash provided by (used in) operating activities	(3,509		)	104,603			60,590
Cash flows from investing activities:
Purchases of property and equipment	(675		)	(268		)	(190		)
Purchases of available-for-sale investments	(279,693		)	(402,500		)	(8,427		)
Sales of available-for-sale investments	239,370			322,236			60
Purchase of ADAPTIX, Inc., net of cash acquired	—			(150,000		)	—
Patent acquisition costs	(25,061		)	(178,260		)	(14,680		)
Net cash used in investing activities	(66,059		)	(408,792		)	(23,237		)
Cash flows from financing activities:
Proceeds from sale of common stock, net of issuance costs	—			218,961			175,229
Repurchases of common stock	(7,926		)	(26,732		)	—
Dividends paid to shareholders	(18,633		)	—			—
Distributions to noncontrolling interests in operating subsidiary	—			(312		)	(2,897		)
Contributions from noncontrolling interests in operating subsidiary, net of issuance costs	1,920			5,793			1,539
Proceeds from the exercise of stock options	486			340			411
Excess tax benefits (shortfalls) from stock-based compensation	(1,398		)	13,210			583
Net cash provided by (used in) financing activities	(25,551		)	211,260			174,865
Increase (decrease) in cash and cash equivalents	(95,119		)	(92,929		)	212,218
Cash and cash equivalents, beginning	221,804			314,733			102,515
Cash and cash equivalents, ending	$	126,685		$	221,804		$	314,733
Supplemental schedule of noncash investing activities:
Patent acquisition costs included in accrued expenses / costs	$	4,000		$	—		$	900

The accompanying notes are an integral part of these consolidated financial statements.

F- 8

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.  DESCRIPTION OF BUSINESS

Description of Business. As used herein, “Acacia” and the “Company” refer to Acacia Research Corporation and/or its wholly and majority-owned and controlled operating subsidiaries. All patent acquisition, prosecution, licensing and enforcement activities are conducted solely by certain of Acacia’s wholly and majority-owned and controlled operating subsidiaries.

Acacia’s operating subsidiaries acquire rights in, license and enforce patented technologies. Acacia’s operating subsidiaries partner with inventors and patent owners, applying their legal and technology expertise to patent assets to unlock the financial value in their patented inventions. Acacia is an intermediary in the patent marketplace, bridging the gap between invention and application, facilitating efficiency and delivering monetary rewards to patent owners.

Acacia’s operating subsidiaries generate revenues and related cash flows from the granting of intellectual property rights for the use of patented technologies that its operating subsidiaries control or own. Acacia’s operating subsidiaries assist patent owners with the prosecution and development of their patent portfolios, the protection of their patented inventions from unauthorized use, the generation of licensing revenue from users of their patented technologies and, where necessary, with the enforcement against unauthorized users of their patented technologies through the filing of patent infringement litigation.

Acacia’s operating subsidiaries are principals in the licensing and enforcement effort, obtaining control of the rights in the patent portfolio, or control of the patent portfolio outright. Acacia’s operating subsidiaries own or control the rights to multiple patent portfolios, which include U.S. patents and certain foreign counterparts, covering technologies used in a wide variety of industries.

In January 2012, a wholly owned operating subsidiary of Acacia acquired ADAPTIX, Inc. (“ADAPTIX”), a pioneer in the development of 4G technologies for wireless systems, for cash consideration of $150 million, net of cash acquired, as described at Note 8 to these consolidated financial statements.

Acacia was incorporated on January 25, 1993 under the laws of the State of California. In December 1999, it changed its state of incorporation from California to Delaware.

2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Accounting Principles and Fiscal Year End.  The consolidated financial statements and accompanying notes are prepared on the accrual basis of accounting in accordance with generally accepted accounting principles in the United States of America. Acacia has a December 31 fiscal year end.

Principles of Consolidation.  The accompanying consolidated financial statements include the accounts of Acacia and its wholly and majority-owned and controlled subsidiaries. Material intercompany transactions and balances have been eliminated in consolidation.

Noncontrolling interests in Acacia’s majority-owned and controlled operating subsidiaries (“noncontrolling interests”) are separately presented as a component of stockholders’ equity in the consolidated statements of stockholders’ equity for the applicable periods presented. Consolidated net income or (loss) is adjusted to include the net (income) or loss attributed to noncontrolling interests in the consolidated statements of operations for the applicable periods presented. Refer to the accompanying consolidated statements of stockholders’ equity for total noncontrolling interests for the applicable periods presented.

In August 2010, a wholly owned subsidiary of Acacia became the general partner of the Acacia Intellectual Property Fund, L.P. (the “Acacia IP Fund”), which was formed in August 2010. The Acacia IP Fund is included in the Company’s consolidated financial statements for the periods presented, as Acacia’s wholly owned subsidiary, as the general partner, has the ability to control the operations and activities of the Acacia IP Fund. Refer to Note 12 to these consolidated financial statements.

Revenue Recognition.  Revenue is recognized when (i) persuasive evidence of an arrangement exists, (ii) all obligations have been substantially performed pursuant to the terms of the arrangement, (iii) amounts are fixed or determinable, and (iv) the collectibility of amounts is reasonably assured.

F- 9

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

In general, revenue arrangements provide for the payment of contractually determined fees in consideration for the grant of certain intellectual property rights for patented technologies owned or controlled by Acacia’s operating subsidiaries. These rights typically include some combination of the following: (i) the grant of a non-exclusive, retroactive and future license to manufacture and/or sell products covered by patented technologies owned or controlled by Acacia’s operating subsidiaries, (ii) a covenant-not-to-sue, (iii) the release of the licensee from certain claims, and (iv) the dismissal of any pending litigation. The intellectual property rights granted may be perpetual in nature, extending until the expiration of the related patents, or can be granted for a defined, relatively short period of time, with the licensee possessing the right to renew the agreement at the end of each contractual term for an additional minimum upfront payment. Pursuant to the terms of these agreements, Acacia’s operating subsidiaries have no further obligation with respect to the grant of the non-exclusive retroactive and future licenses, covenants-not-to-sue, releases, and other deliverables, including no express or implied obligation on Acacia’s operating subsidiaries’ part to maintain or upgrade the technology, or provide future support or services. Generally, the agreements provide for the grant of the licenses, covenants-not-to-sue, releases, and other significant deliverables upon execution of the agreement, or upon receipt of the minimum upfront payment for term agreement renewals. As such, the earnings process is complete and revenue is recognized upon the execution of the agreement, when collectibility is reasonably assured, or upon receipt of the minimum upfront fee for term agreement renewals, and when all other revenue recognition criteria have been met.

Certain of the Company’s revenue arrangements provide for future royalties or additional required payments based on future licensee activities. Additional royalties are recognized in revenue upon resolution of the related contingency provided that all revenue recognition criteria, as described above, have been met. Amounts of additional royalties due under these license agreements, if any, cannot be reasonably estimated by management.

Certain of the Company’s revenue arrangements provide for the calculation of fees based on a licensee’s actual quarterly sales or actual per unit activity, applied to a contractual royalty rate. Licensees that pay fees on a quarterly basis generally report actual quarterly sales or actual per unit activity information and related quarterly fees due within 30 days to 45 days after the end of the quarter in which such sales or activity takes place. The amount of fees due under these revenue arrangements each quarter cannot be reasonably estimated by management. Consequently, Acacia’s operating subsidiaries recognize revenue from these revenue arrangements on a three-month lag basis, in the quarter following the quarter of sales or per unit activity, provided amounts are fixed or determinable and collectibility is reasonably assured. The lag method described above allows for the receipt of licensee royalty reports prior to the recognition of revenue.

Amounts related to revenue arrangements that do not meet the revenue recognition criteria described above are deferred until the revenue recognition criteria are met.

Acacia assesses the collectibility of fees receivable based on a number of factors, including past transaction history and credit-worthiness of licensees. If it is determined that collection is not reasonably assured, the fee is recognized when collectibility becomes reasonably assured, assuming all other revenue recognition criteria have been met, which is generally upon receipt of cash.

Cost of Revenues.  Cost of revenues include the costs and expenses incurred in connection with Acacia’s patent licensing and enforcement activities, including inventor royalties paid to original patent owners, contingent legal fees paid to external patent counsel, other patent-related legal expenses paid to external patent counsel, licensing and enforcement related research, consulting and other expenses paid to third-parties and the amortization of patent-related acquisition costs. These costs are included under the caption “Cost of revenues” in the accompanying consolidated statements of operations.  

Inventor Royalties and Contingent Legal Expenses. Inventor royalties are expensed in the consolidated statements of operations in the period that the related revenues are recognized. In certain instances, pursuant to the terms of the underlying inventor agreements, costs paid by Acacia’s operating subsidiaries to acquire patents are recoverable from future net revenues. Patent acquisition costs that are recoverable from future net revenues are amortized over the estimated economic useful life of the related patents, or as the prepaid royalties are earned by the inventor, as appropriate, and the related expense is included in amortization expense in the consolidated statements of operations. Any unamortized patent acquisition costs recovered from net revenues are expensed in the period recovered, and included in amortization expense in the consolidated statements of operations.

Contingent legal fees are expensed in the consolidated statements of operations in the period that the related revenues are recognized. In instances where there are no recoveries from potential infringers, no contingent legal fees are paid; however, Acacia’s operating subsidiaries may be liable for certain out of pocket legal costs incurred pursuant to the underlying legal services agreement. Legal fees advanced by contingent law firms that are required to be paid in the event that no license recoveries are obtained are expensed as incurred and included in liabilities in the consolidated balance sheets.

F- 10

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Fair Value Measurements. U.S. generally accepted accounting principles define fair value as the price that would be received for an asset or the exit price that would be paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants on the measurement date, and also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs, where available. The three-level hierarchy of valuation techniques established to measure fair value, is defined as follows:

●	Level 1 -	Observable Inputs:  Quoted prices in active markets for identical investments;
●	Level 2 -	Pricing Models with Significant Observable Inputs:  Other significant observable inputs, including quoted prices for similar investments, interest rates, credit risk, etc.; and
●	Level 3 -	Unobservable Inputs:  Significant unobservable inputs, including the entity’s own assumptions in determining the fair value of investments.

 Whenever possible, the Company is required to use observable market inputs (Level 1 - quoted market prices) when measuring fair value.

Cash and Cash Equivalents.  Acacia considers all highly liquid, short-term investments with original maturities of three months or less when purchased to be cash equivalents. For the periods presented, Acacia’s cash equivalents are comprised of investments in AAA rated money market funds that invest in first-tier only securities, which primarily includes: domestic commercial paper, securities issued or guaranteed by the U.S. government or its agencies, U.S. bank obligations, and fully collateralized repurchase agreements. Acacia’s cash equivalents are measured at fair value using quoted prices that represent Level 1 inputs.

Investments in Marketable Securities.  Investments in securities with original maturities of greater than three months and less than one year and other investments representing amounts that are available for current operations are classified as short-term investments, unless there are indications that such investments may not be readily sold in the short term. The fair values of these investments approximate their carrying values. At December 31, 2013 and 2012, all of Acacia’s investments were classified as available-for-sale, which are reported at fair value on a recurring basis using significant observable inputs (Level 1) whenever possible, with related unrealized gains and losses in the value of such securities recorded as a separate component of other comprehensive income (loss) in stockholders’ equity until realized. Realized and unrealized gains and losses are recorded based on the specific identification method. Interest on all securities is included in interest income.

Impairment of Marketable Securities. Acacia evaluates its investments in marketable securities for potential impairment, employing a systematic methodology on a quarterly basis that considers available quantitative and qualitative evidence. If the cost or carrying value of an investment exceeds its estimated fair value, the Company evaluates, among other factors, general market conditions, credit quality of instrument issuers, the duration and extent to which the fair value is less than cost, and the Company’s intent and ability to hold, or plans or ability to sell. Fair value is estimated based on publicly available market information or other estimates determined by management. Investments are considered to be impaired when a decline in fair value is estimated to be other-than-temporary. Acacia reviews impairments associated with its investments in marketable securities and determines the classification of any impairment as temporary or other-than-temporary. An impairment is deemed other-than-temporary unless (a) Acacia has the ability and intent to hold an investment for a period of time sufficient for recovery of its carrying amount and (b) positive evidence indicating that the investment’s carrying amount is recoverable within a reasonable period of time outweighs any evidence to the contrary. All available evidence, both positive and negative, is considered to determine whether, based on the weight of such evidence, the carrying amount of the investment is recoverable within a reasonable period of time. For investments classified as available-for-sale, unrealized losses that are other-than-temporary are recognized in the consolidated statements of operations.  

Concentration of Credit Risks.  Financial instruments that potentially subject Acacia to concentrations of credit risk are cash equivalents, investments and accounts receivable. Acacia places its cash equivalents and investments primarily in highly rated money market funds and investment grade marketable securities. Cash equivalents are also invested in deposits with certain financial institutions and may, at times, exceed federally insured limits. Acacia has not experienced any significant losses on its deposits of cash and cash equivalents.

Two licensees individually accounted for 38% and 16%, respectively, of revenues recognized during the year ended December 31, 2013. Four licensees individually accounted for 21%, 14%, 10% and 10%, respectively, of revenues recognized during the year ended December 31, 2012. Three licensees individually accounted for 26%, 17% and 15%, respectively, of revenues recognized during the year ended December 31, 2011. Two licensees individually represented approximately 60% and 22%, respectively, of accounts receivable at December 31, 2013. Three licensees individually represented approximately 34%, 30% and 25% of accounts receivable at December 31, 2012. For 2013, 2012 and 2011, 24%, 43% and 49%, respectively, of

F- 11

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

revenues were attributable to licensees domiciled in foreign jurisdictions, based on the jurisdiction of the entity obligated to satisfy payment obligations pursuant to the applicable revenue arrangement. The Company does not have any material foreign operations.

Acacia performs credit evaluations of its licensees with significant receivable balances, if any, and has not experienced any significant credit losses. Accounts receivable are recorded at the executed contract amount and generally do not bear interest. Collateral is not required. An allowance for doubtful accounts may be established to reflect the Company’s best estimate of probable losses inherent in the accounts receivable balance, and is reflected as a contra-asset account on the balance sheet and a charge to operating expenses in the statement of operations for the applicable period. The allowance is determined based on known troubled accounts, historical experience, and other currently available evidence. There was no allowance for doubtful accounts established for the periods presented.

Property and Equipment.  Property and equipment are recorded at cost. Major additions and improvements that materially extend useful lives of property and equipment are capitalized. Maintenance and repairs are charged against the results of operations as incurred. When these assets are sold or otherwise disposed of, the asset and related depreciation are relieved, and any gain or loss is included in the consolidated statements of operations for the period of sale or disposal. Depreciation and amortization is computed on a straight-line basis over the following estimated useful lives of the assets:

Furniture and fixtures	3 to 5 years
Computer hardware and software	3 to 5 years
Leasehold improvements	2 to 5 years (Lesser of lease term or useful life of improvement)

Rental payments on operating leases are charged to expense in the consolidated statements of operations on a straight-line basis over the lease term.

Organization Costs.  Costs of start-up activities, including organization costs, are expensed as incurred.

Patents.  Patents includes the cost of patents or patent rights (hereinafter, collectively “patents”), acquired from third-parties or acquired in connection with business combinations. Patent acquisition costs are amortized utilizing the straight-line method over their remaining economic useful lives, ranging from one to ten years. Certain patent application and prosecution costs incurred to secure additional patent claims, that based on management’s estimates are deemed to be recoverable, are capitalized and amortized over the remaining estimated economic useful life of the related patent portfolio.

Goodwill. Goodwill is tested for impairment at the reporting unit level (operating segment or one level below an operating segment) on an annual basis (December 31 for Acacia) and between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value. Acacia considers its market capitalization and the carrying value of its assets and liabilities, including goodwill, when performing its goodwill impairment test. When conducting its annual goodwill impairment assessment, the Company initially performs a qualitative evaluation of whether it is more likely than not that goodwill is impaired. If it is determined by a qualitative evaluation that it is more likely than not that goodwill is impaired, the Company then applies a two-step impairment test. The two-step impairment test first compares the fair value of the Company’s reporting unit to its carrying or book value. If the fair value of the reporting unit exceeds its carrying value, goodwill is not impaired and the Company is not required to perform further testing. If the carrying value of the reporting unit exceeds its fair value, the Company determines the implied fair value of the reporting unit’s goodwill and if the carrying value of the reporting unit’s goodwill exceeds its implied fair value, then an impairment loss equal to the difference is recorded in the consolidated statement of operations.

Impairment of Long-lived Assets. Acacia reviews long-lived assets and intangible assets for potential impairment annually (quarterly for patents) and when events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. In the event the sum of the expected undiscounted future cash flows resulting from the use of the asset is less than the carrying amount of the asset, an impairment loss equal to the excess of the asset’s carrying value over its fair value is recorded. If an asset is determined to be impaired, the loss is measured based on quoted market prices in active markets, if available. If quoted market prices are not available, the estimate of fair value is based on various valuation techniques, including a discounted value of estimated future cash flows.

Fair value is generally estimated using the “Income Approach,” focusing on the estimated future net income-producing capability of the patent portfolios over the estimated remaining economic useful life. Estimates of future after-tax cash flows are converted to present value through “discounting,” including an estimated rate of return that accounts for both the time value

F- 12

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

of money and investment risk factors. Estimated cash inflows are typically based on estimates of reasonable royalty rates for the applicable technology, applied to estimated market share data. Estimated cash outflows are based on existing contractual obligations, such as contingent legal fee and inventor royalty obligations, applied to estimated license fee revenues, in addition to other estimates of out-of-pocket expenses associated with a specific patent portfolio’s licensing and enforcement program. The analysis also contemplates consideration of current information about the patent portfolio including, status and stage of litigation, periodic results of the litigation process, strength of the patent portfolio, technology coverage and other pertinent information that could impact future net cash flows.

Fair Value of Financial Instruments.  The carrying value of cash and cash equivalents, investments, accounts receivables, accounts payable and accrued expenses approximates their fair values due to their short-term maturities.

Contingent Liabilities. The Company, from time to time, is involved in certain legal proceedings. Based upon consultation with outside counsel handling its defense in these matters and the Company’s analysis of potential outcomes, if the Company determines that a loss arising from such matters is probable and can be reasonably estimated, an estimate of the contingent liability is recorded in its consolidated financial statements. If only a range of estimated loss can be determined, an amount within the range that, based on estimates, assumptions and judgments, reflects the most likely outcome, is recorded as a contingent liability in the consolidated financial statements. In situations where none of the estimates within the estimated range is a better estimate of probable loss than any other amount, the Company records the low end of the range. Any such accrual would be charged to expense in the appropriate period. Litigation expenses for these types of contingencies are recognized in the period in which the litigation services were provided.

Stock-Based Compensation. The compensation cost for all stock-based awards is measured at the grant date, based on the fair value of the award, and is recognized as an expense, on a straight-line basis, over the employee’s requisite service period (generally the vesting period of the equity award) which is generally two to four years. The fair value of restricted stock and restricted stock unit awards is determined by the product of the number of shares or units granted and the grant date market price of the underlying common stock. The fair value of each option award is estimated on the date of grant using a Black-Scholes option valuation model. Stock-based compensation expense is recorded only for those awards expected to vest using an estimated forfeiture rate. Refer to Note 11 to these notes to consolidated financial statements for information on stock-based awards granted for the periods presented.

Income Taxes.  Income taxes are accounted for using an asset and liability approach that requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in Acacia’s consolidated financial statements or consolidated tax returns. A valuation allowance is established to reduce deferred tax assets if all, or some portion, of such assets will more than likely not be realized.

Under U.S. generally accepted accounting principles, a tax position is a position in a previously filed tax return or a position expected to be taken in a future tax filing that is reflected in measuring current or deferred income tax assets and liabilities. Tax positions are recognized only when it is more likely than not (likelihood of greater than 50%), based on technical merits, that the position will be sustained upon examination. Tax positions that meet the more likely than not threshold are measured using a probability weighted approach as the largest amount of tax benefit that is greater than 50% likely of being realized upon settlement.

Acacia recognizes interest and penalties with respect to unrecognized tax benefits in income tax expense. Acacia has identified no uncertain tax position for which it is reasonably possible that the total amount of unrecognized tax benefits will significantly increase or decrease within 12 months.

If a deduction reported on a tax return for an equity-based incentive award exceeds the cumulative compensation cost for those instruments recognized for financial reporting purposes, any resulting realized tax benefit that exceeds the previously calculated deferred tax asset for those instruments is considered an excess tax benefit, and is recognized as additional paid-in capital. If the tax deduction is less than the cumulative book compensation cost, the tax effect of the resulting difference is charged first to APIC, to the extent of the available pool of windfall tax benefits, with any remainder recognized in income tax expense.

Comprehensive Income (Loss).  Comprehensive income (loss) is the change in equity from transactions and other events and circumstances other than those resulting from investments by owners and distributions to owners.

Segment Reporting.  Acacia uses the management approach, which designates the internal organization that is used by management for making operating decisions and assessing performance as the basis of Acacia’s reportable segments. Acacia’s patent licensing and enforcement business constitutes its single reportable segment.

F- 13

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Use of Estimates.  The preparation of financial statements in conformity with generally accepted accounting principles in the United States of America requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates. Acacia believes that, of the significant accounting policies described herein, the accounting policies associated with revenue recognition, stock-based compensation expense, impairment of marketable securities and intangible assets, the determination of the economic useful life of amortizable intangible assets, income taxes and valuation allowances against net deferred tax assets and the application of the acquisition method of accounting for business combinations, require its most difficult, subjective or complex judgments.

Earnings (Loss) Per Share.  The Company computes net income (loss) attributable to common stockholders using the two-class method required for capital structures that include participating securities. Under the two-class method, securities that participate in non-forfeitable dividends, such as the Company’s outstanding unvested restricted stock, are considered “participating securities.”

In applying the two-class method, (i) basic net income (loss) per share is computed by dividing net income (loss) (less any dividends paid on participating securities) by the weighted average number of shares of common stock and participating securities outstanding for the period and (ii) diluted earnings per share may include the additional effect of other securities, if dilutive, in which case the dilutive effect of such securities is calculated by applying the two-class method and the treasury stock method to the assumed exercise or vesting of potentially dilutive common shares. The method yielding the more dilutive result is ultimately reported for the applicable period. Potentially dilutive common stock equivalents primarily consist of employee stock options, and restricted stock units for calculations utilizing the two-class method, and also include unvested restricted stock, when utilizing the treasury method.

The following table presents the weighted-average number of common shares outstanding used in the calculation of basic and diluted income per share:

	2013			2012			2011
Numerator (in thousands):
Basic
Net income (loss)	$	(56,434	)	$	59,453		$	21,106
Undistributed earnings allocated to participating securities	—			(1,889		)	(841		)
Total dividends paid	(18,633		)	—			—
Dividends attributable to common stockholders	18,122			—			—
Net income (loss) attributable to common stockholders – basic	$	(56,945	)	$	57,564		$	20,265
Diluted
Net income (loss)	$	(56,434	)	$	59,453		$	21,106
Undistributed earnings allocated to participating securities	—			(1,876		)	(833		)
Total dividends paid	(18,633		)	—			—
Dividends attributable to common stockholders	18,122			—			—
Net income (loss) attributable to common stockholders – diluted	$	(56,945	)	$	57,577		$	20,273
Denominator:
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders – basic	48,155,832			47,251,061			39,743,433
Effect of potentially dilutive securities:
Common stock options and restricted stock units	—			333,059			407,167
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders – diluted	48,155,832			47,584,120			40,150,600
Basic net income (loss) per common share	$	(1.18	)	$	1.22		$	0.51
Diluted net income (loss) per common share	$	(1.18	)	$	1.21		$	0.50
Anti-dilutive equity-based incentive awards excluded from the computation of diluted income (loss) per share	27,760			30,812			7,760

F- 14

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Revision of Prior Period Earnings (Loss) Per Share - Two-Class Method. In connection with the preparation of the Company’s Quarterly Report on Form 10-Q as of and for the three and nine months ended September 30, 2013, the Company determined that its basic and diluted net income (loss) per share calculations should have been prepared using the “two-class method.” Pursuant to guidance set forth in Staff Accounting Bulletin (“SAB”) No. 99, “Materiality,” the Company concluded that the errors were not material to any of its prior period financial statements. Although the errors were immaterial to prior periods, the prior period financial statements presented herein were revised, in accordance with SAB No. 108, “Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements.” The impact of the revision for the comparable prior period earnings (loss) per share calculations using the two-class method were as follows:

	2012		2011
Numerator:
Net income attributable to common stockholders – basic and diluted - As Reported	$	59,453	$	21,106
Net income attributable to common stockholders – basic - As Adjusted	$	57,564	$	20,265
Net income attributable to common stockholders – diluted - As Adjusted	$	57,577	$	20,273
Denominator:
Weighted-average shares used in computing net income per share attributable to common stockholders – basic - As Reported	47,251,061		39,743,433
Weighted-average shares used in computing net income per share attributable to common stockholders – basic - As Adjusted	47,251,061		39,743,433
Weighted-average shares used in computing net income per share attributable to common stockholders – diluted - As Reported	48,060,647		41,258,297
Weighted-average shares used in computing net income per share attributable to common stockholders – diluted - As Adjusted	47,584,120		40,150,600
Basic net income per common share - As Reported	$	1.26	$	0.53
Basic net income per common share - As Adjusted	$	1.22	$	0.51
Diluted net income per common share - As Reported	$	1.24	$	0.51
Diluted net income per common share - As Adjusted	$	1.21	$	0.50

Treasury Stock. Repurchases of the Company’s outstanding common stock are accounted for using the cost method. The applicable par value is deducted from the appropriate capital stock account on the formal or constructive retirement of treasury stock. Any excess of the cost of treasury stock over its par value is charged to additional paid-in capital, and reflected as Treasury Stock on the consolidated balance sheets.

Recently Adopted Accounting Pronouncements - Adopted Effective January 1, 2013. In February 2013, the Financial Accounting Standards Board (“FASB”) issued a new accounting standard requiring an entity to report the effect of significant reclassifications out of accumulated other comprehensive income on the respective line items in net income if the amount being reclassified is required under U.S. Generally Accepted Accounting Principles (“U.S. GAAP”) to be reclassified in its entirety to net income. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety to net income in the same reporting period, an entity is required to cross-reference other disclosures required under U.S. GAAP that provide additional detail about those amounts. This pronouncement is effective prospectively for reporting periods beginning after December 15, 2012. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements and related disclosures.

In December 2012, the FASB issued a new accounting standard that will require the Company to disclose information about offsetting and related arrangements to enable users of its financial statements to understand the effect of those arrangements on its financial position. The new guidance is effective for the Company’s interim period ending March 31, 2013. The disclosures required are to be applied retrospectively for all comparative periods presented. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements and related disclosures.

In July 2013, the FASB issued an accounting update which provides guidance on financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward or a tax credit carryforward exists in the same taxing jurisdiction. Per this guidance, an entity must present the unrecognized tax benefit as a reduction to a deferred tax asset, except

F- 15

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

when the carryforward is not available as of the reporting date under the governing tax law to settle taxes or the entity does not intend to use the deferred tax asset for this purpose. This amendment does not impact the recognition or measurement of uncertain tax positions or the disclosure reconciliation of gross unrecognized tax benefits. The new accounting standards update becomes effective for the Company on January 1, 2014 and it should be applied prospectively to unrecognized tax benefits that exist at the effective date with retrospective application permitted. Early adoption of the update is permitted and an entity may choose to apply this amendment retrospectively to each reporting period presented. The adoption of this accounting update did not have a material impact on the Company’s consolidated financial statements.

3.  SHORT-TERM INVESTMENTS

Short-term marketable securities for the periods presented were comprised of the following (in thousands):

	December 31, 2013
Security Type	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. government fixed income securities	$	130,971	$	21	$	(975	)	$	130,017
Total short-term investments	$	130,971	$	21	$	(975	)	$	130,017

	December 31, 2012
Security Type	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. government fixed income securities	$	87,394	$	20	$	(411	)	$	87,003
Equity securities of certain technology companies	3,254		—		(782		)	2,472
Total short-term investments	$	90,648	$	20	$	(1,193	)	$	89,475

Short-term investments at December 31, 2013 and 2012 were comprised of investments in highly liquid, AAA, U.S. government fixed income securities with maturity dates ranging from 2014 to 2015, and 2013 to 2014, respectively. Short-term marketable securities in unrealized loss positions at December 31, 2013 and 2012 have been in continuous unrealized loss positions for less than one year.

U.S. government fixed income securities. The gross unrealized loss can be primarily attributed to a combination of market conditions as well as the demand for and duration of the U.S. government fixed income securities. The Company has the ability to hold these securities until maturity, currently has no intent to sell, there is no requirement to sell and the Company believes that it can recover the amortized cost of these investments. The Company has found no evidence of impairment due to credit losses in its portfolio. Therefore, these unrealized losses were recorded in other comprehensive income (loss). However, the Company cannot provide any assurance that its portfolio of short-term marketable securities will not be impacted by adverse conditions in the financial markets, which may require the Company in the future to record an impairment charge for credit losses which could adversely impact its financial results.

For the year ended December 31, 2013, proceeds from the sale of short-term marketable securities classified as available-for-sale were $239,370,000, gross realized gains were $1,174,000 and gross realized losses were $981,000. For the year ended December 31, 2012, proceeds from the sale of short-term marketable securities classified as available-for-sale were $319,811,000, gross realized gains were $31,000 and gross realized losses were $555,000. Proceeds from the sale of short-term marketable securities classified as available-for-sale and related gross realized gains and losses were not material for the year ended December 31, 2011.

F- 16

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

4.  PROPERTY AND EQUIPMENT

Property and equipment consists of the following at December 31, 2013 and 2012 (in thousands):

	2013			2012
Furniture and fixtures	$	783		$	472
Computer hardware and software	687			586
Leasehold improvements	306			173
	1,776			1,231
Less:  accumulated depreciation and amortization	(1,010		)	(892		)
	$	766		$	339

Depreciation expense was $236,000, $149,000 and $105,000 for the years ended December 31, 2013, 2012 and 2011, respectively. In 2013, we retired $130,000 of items held in property and equipment and recorded a $12,000 loss on disposal.

5.  ACCOUNTS PAYABLE AND ACCRUED EXPENSES

Accounts payable and accrued expenses consist of the following at December 31, 2013 and 2012 (in thousands):

	2013		2012
Accounts payable	$	128	$	642
Payroll and other employee benefits	1,039		1,815
Accrued vacation	813		703
Accrued legal expenses - patent	5,900		3,990
Accrued consulting and other professional fees	2,948		1,510
Accrued distribution to noncontrolling interests	504		504
Other accrued liabilities	223		71
	$	11,555	$	9,235

6.  GOODWILL AND OTHER IDENTIFIABLE INTANGIBLE ASSETS

Acacia’s only identifiable intangible assets are patents and patent rights, with estimated remaining economic useful lives ranging from one to ten years. For all periods presented, all of Acacia’s identifiable intangible assets were subject to amortization. The gross carrying amounts and accumulated amortization related to acquired intangible assets as of December 31, 2013 and 2012 are as follows (in thousands): 

	2013			2012
Gross carrying amount - patents	$	400,755		$	383,379
Accumulated amortization - patents	(112,323		)	(69,850		)
Patents, net	$	288,432		$	313,529

The weighted-average remaining estimated economic useful life of Acacia’s patents and patent rights is 7 years. Scheduled annual aggregate amortization expense for each of the next five years through December 31, 2018 is estimated to be $47,654,000 in 2014, $46,554,000 in 2015, $44,051,000 in 2016, $43,268,000 in 2017, and $39,381,000 in 2018.

For the years ended December 31, 2013, 2012 and 2011, on a consolidated basis, Acacia’s operating subsidiaries incurred and capitalized patent and patent rights acquisition costs totaling $25,061,000, $178,260,000 (excluding the acquisition of ADAPTIX) and $14,680,000, respectively. The patents have estimated economic useful lives ranging from three to ten years. Included in capitalized patent costs as of December 31, 2013 are $4,000,000 of accrued future patent-related acquisition costs that management expects to incur pursuant to the terms of the underlying patent acquisition agreements, which are being amortized over the estimated economic useful life of the patents acquired.

F- 17

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Refer to Note 8 to these consolidated financial statements for additions to patents and goodwill in connection with Acacia’s acquisition of ADAPTIX and the related application of the acquisition method of accounting.

During the periods presented, certain operating subsidiaries recovered up-front patent portfolio acquisition costs from applicable net licensing proceeds prior to the scheduled amortization of such up-front patent portfolio acquisition costs, resulting in the acceleration of amortization expense for the applicable patent-related assets. For the years ended December 31, 2013, 2012 and 2011, accelerated amortization expense related to the recovery of up-front patent acquisition costs totaled $592,000, $10,574,000 and $3,111,000, respectively.

For the years ended December 31, 2013, 2012 and 2011, pursuant to the terms of the respective inventor agreements, certain Acacia operating subsidiaries elected to terminate or sell their rights to patent portfolios, resulting in the acceleration of amortization expense for the patent-related assets totaling $1,747,000, $3,034,000 and $1,103,000, respectively. Included in amortization of patents for the year ended December 31, 2013 are patent impairment charges totaling $4,619,000. The impairment charges, related to certain patent portfolios that management, in the fourth quarter of 2013, determined it would no longer allocate future resources to in connection with the licensing and enforcement of such portfolios, due primarily to potential prior art related complexities in two of the programs and/or the overall determination that future resources would be allocated to other licensing and enforcement programs with higher potential return profiles. The impairment charges consisted of the remaining net carrying value of the related portfolios as of December 31, 2013.

For the years ended December 31, 2013, 2012 and 2011, capitalized patent costs and accumulated amortization, and sales proceeds and other costs, related to patent-related sales and disposals are as follows (in thousands):

	2013		2012		2011
Capitalized patent costs	$	3,500	$	5,500	$	4,612
Accumulated amortization	1,753		2,466		3,509
Sales proceeds	1,000		2,792		11,000
Other costs	—		—		4,717

7.  FAIR VALUE MEASUREMENTS AND AUCTION RATE SECURITIES

As of December 31, 2011, Acacia held investment grade auction rate securities with a par value totaling $2,425,000, consisting of auction rate investments backed by student loans, which were classified as noncurrent, available-for-sale and reflected at fair value. The fair values of these securities were estimated utilizing an analysis of certain unobservable inputs (Level 3) and by reference to periodic discounted cash flow analyses.

All outstanding auction rate securities as of December 31, 2011, were sold during the year ended December 31, 2012. For the year ended December 31, 2012 auction rate securities related recognized gains included in earnings totaled $118,000, and total settlements of auction rate securities totaled $2,074,000. 

8. ACQUISITION

On January 12, 2012 (the “Acquisition Date”), pursuant to the terms and conditions of the Agreement and Plan of Merger dated as of November 22, 2011 (the “Merger Agreement”) among Acacia Research Group LLC (“ARG”), a wholly-owned subsidiary of Acacia, Apollo Patent Corp., a newly-formed, wholly-owned subsidiary of ARG (“Merger Sub”), ADAPTIX, a Delaware corporation, and Baker Communications Fund II (QP), L.P. solely in its capacity as shareholder representative, ARG completed its acquisition of ADAPTIX, which held no material assets other than its portfolio of patents and $10 million in cash, through a merger of Merger Sub with and into ADAPTIX, with ADAPTIX as the surviving corporation (the “Merger”). Upon completion of the Merger, the separate corporate existence of Merger Sub ceased and ADAPTIX became a wholly-owned subsidiary of ARG.

ADAPTIX, a pioneer in the development of 4G technologies for wireless systems, is a technology company recognized in the industry as one of the first developers of 4G wireless systems. With patents filed as early as 2000, ADAPTIX’s research and development efforts have resulted in a significant intellectual property portfolio focused on 4G

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ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

technologies. With its growing portfolio of 230 issued and pending patents in 13 countries, ADAPTIX’s innovations extend across a broad range of 4G technologies including OFDMA and MIMO.

The Merger was being accounted for in accordance with the acquisition method of accounting under FASB ASC Topic 805, “Business Combinations” (“Topic 805”). Topic 805 requires, among other things, that identifiable assets acquired and liabilities assumed be recognized at their fair values as of the Acquisition Date. Under the acquisition method of accounting, the purchase consideration is allocated to the assets acquired, including tangible assets, patents and other identifiable intangible assets and liabilities assumed, based on their estimated fair market values on the date of acquisition. Any excess purchase price after the initial allocation to identifiable net tangible and identifiable intangible assets is assigned to goodwill. Amounts attributable to patents are amortized using the straight-line method over the estimated economic useful life of the underlying patents.

The total consideration paid by ARG in connection with the Merger was approximately $160 million, in cash. Based on the total purchase consideration and the estimate of the assets acquired and the liabilities assumed by ARG as of the Acquisition Date, the purchase price allocation was as follows ($ amounts in thousands):

				Amortization Period	Annual Amortization
Assets Acquired and Liabilities Assumed:
Fair value of net tangible assets acquired	$	10,000
Intangible assets acquired - patents	150,000			10 years	$	15,000
Goodwill	30,149
Net deferred income tax liability	(30,149		)
Total	$	160,000

Amounts attributable to the patents acquired are being amortized using the straight-line method over an estimated weighted average economic useful life of the underlying patents, which was estimated to be approximately 10 years. Goodwill is calculated as the residual after recording the identifiable net assets acquired and associated net deferred tax assets and liabilities.

Management is responsible for determining the fair value of the tangible and identifiable intangible assets acquired and liabilities assumed as of the Acquisition Date. Management considered a number of factors, including reference to an analysis under Topic 805 solely for the purpose of allocating the purchase price to the assets acquired and liabilities assumed. The analysis included a discounted cash flow which estimated future net cash flows resulting from the licensing and enforcement of the patent portfolio based on information as of the date of acquisition, considering assumptions and estimates related to potential infringers of the patents, applicable industries, usage of the underlying patented technologies, estimated license fee revenues, contingent legal fee arrangements, other estimated costs, tax implications and other factors. A discount rate consistent with the risks associated with achieving the estimated net cash flows was used to estimate the present value of estimated net cash flows.

The Merger was treated for tax purposes as a nontaxable transaction and as such, the historical tax bases of the acquired assets and assumed liabilities, net operating losses, and other tax attributes of ADAPTIX will carryover. As a result, no new tax goodwill will be created in connection with the Merger as there is no step-up to fair value of the underlying tax bases of the acquired net assets. Acquisition accounting includes the establishment of a net deferred tax asset or liability resulting from book tax basis differences related to assets acquired and liabilities assumed on the date of acquisition. Acquisition date deferred tax assets primarily relate to certain net operating loss carryforwards of ADAPTIX. Acquisition date deferred tax liabilities relate to specifically identified non-goodwill intangibles acquired. The estimated net deferred tax liability was determined as follows ($ amounts in thousands):

F- 19

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

	Book Basis		Tax Basis		Difference
Intangible assets acquired - patents	$	150,000	$	—	$	(150,000	)
Estimated acquired deferred tax assets (including net operating loss carryforwards) - ADAPTIX	—		63,860		63,860
Net deferred tax liability - pretax					(86,140		)
Estimated tax rate					35		%
Estimated net deferred tax liability					$	(30,149	)

The following unaudited pro forma combined results of operations for periods presented are provided for illustrative purposes only and assume the acquisition occurred as of January 1, 2012. The unaudited pro forma combined financial results do not purport to be indicative of the results of operations for future periods or the results that actually would have been realized had the entities been a single entity during these periods. The unaudited pro forma combined results are presented in thousands, except share and per share information.

	2012			2011
Revenues	$	250,727		$	172,256
Total operating costs and expenses	170,953			159,674
Operating income	79,774			12,582
Interest and investment income	937			96
Income from operations before provision for income taxes	80,711			12,678
Provision for income taxes	(22,060		)	(8,708		)
Net income including noncontrolling interests in operating subsidiaries	58,651			3,970
Net loss (income) attributable to noncontrolling interests in operating subsidiaries	164			(539		)
Net income attributable to Acacia Research Corporation	$	58,815		$	3,431

	2012		2011
Pro forma income per common share attributable to Acacia Research Corporation:
Basic earnings per share	$	1.24	$	0.09
Diluted earnings per share	$	1.22	$	0.08
Weighted average number of shares outstanding, basic	47,251,061		39,743,433
Weighted average number of shares outstanding, diluted	48,060,647		41,258,297

Pro forma adjustments primarily relate to the amortization of identifiable intangible assets acquired over an estimated economic useful life of ten years, historical operating expenses of ADAPTIX for 2012, and the expensing of acquisition costs incurred by ARG in connection with the Merger.

The unaudited pro forma combined statements of income for the periods presented herein have been adjusted to give effect to pro forma events that are expected to have a continuing impact on the combined results. As such, the income tax benefit related to the release of valuation allowance reflected in the statement of operations for 2012, as described at Note 10, is not reflected in the accompanying unaudited pro forma combined statements of operations for the periods presented.

9.  STOCKHOLDERS’ EQUITY

Equity Offerings. In February 2012, Acacia raised gross proceeds of $225,000,000 through the sale of 6,122,449 shares of Acacia’s common stock at a price of $36.75 per share in a private placement offering with certain institutional accredited investors. Net proceeds, net of placement agent fees and estimated offering expenses, totaled approximately$218,961,000. The use of proceeds included the finance of pending and future acquisitions of patents and patent royalties and other patent licensing vehicles and companies with patent assets, and for working capital and general corporate purposes.

F- 20

In March 2011, Acacia completed a public offering of 5,750,000 shares of common stock. The public offering price was $31.50 per share, and the net proceeds to the Company totaled approximately $175,229,000 after deducting underwriting discounts and related offering expenses. Acacia retained broad discretion over the use of the net proceeds from the sale of common stock including use for operations and for other general corporate purposes, including, but not limited to, working capital, strategic acquisitions and other transactions.

Repurchases of Common Stock. On November 16, 2012, Acacia’s Board of Directors authorized a program for repurchases of shares of Acacia’s outstanding common stock. Under the stock repurchase program, effective November 16, 2012, Acacia was authorized to purchase in the aggregate up to $100,000,000 of its outstanding common stock through the period ended May 15, 2013. On April 23, 2013, Acacia’s Board of Directors approved an extension of the stock repurchase program from May 15, 2013 until August 15, 2013. The November 16, 2012 program expired on August 15, 2013.

On November 15, 2013, Acacia’s Board of Directors authorized a program for repurchases of shares of Acacia’s outstanding common stock. Under the stock repurchase program, effective November 15, 2013, Acacia was authorized to purchase in the aggregate up to $70,000,000 of its of its outstanding common stock through the period ending May 14, 2014.

Repurchases may be made from time to time by Acacia in the open market or in block purchases in compliance with applicable Securities and Exchange Commission rules. Repurchases to date were made using existing cash resources and occurred in the open market. The authorization to repurchase shares presented an opportunity to reduce the outstanding share count and enhance stockholder value. Following are our monthly stock repurchases for the periods presented, all of which were purchased as part of publicly announced plans or programs:

	Total Number of Shares Purchased	Average Price paid per Share		Approximate Dollar Value of Shares that May Yet be Purchased under the Program		Plan Expiration
November 16, 2012 - November 30, 2012	256,262	$	21.58	$	—	August 15, 2013
December 1, 2012 - December 31, 2012	873,146	$	24.26	$	—	August 15, 2013
Totals for 2012	1,129,408	$	23.65
December 4, 2013 - December 11, 2013	600,000	$	13.18	$	62,074,000	May 14, 2014
Totals for 2013	600,000

Cash Dividends. On April 23, 2013, Acacia announced that its Board of Directors approved the adoption of a cash dividend policy that calls for the payment of an expected total annual cash dividend of $0.50 per common share, payable in the amount of $0.125 per share per quarter. Under the policy, the Company paid three quarterly cash dividends totaling $18,633,000 in 2013. While the Company paid dividends to holders of our common stock on a quarterly basis during fiscal year 2013, the declaration and payment of future dividends will depend on many factors, including, but not limited to, our earnings and financial condition, and any future dividends will be made solely at the discretion of our Board of Directors.

On February 20, 2014, Acacia announced that its Board of Directors approved a fourth quarterly cash dividend payable in the amount of $0.125 per share. The quarterly cash dividend will be paid on March 31, 2014 to shareholders of record at close of business on March 3, 2014.

F- 21

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

10.  INCOME TAXES

Acacia’s provision for income taxes consists of the following (in thousands): 

	2013			2012			2011
Current:
Federal	$	—		$	—		$	179
State taxes	113			281			943
Foreign taxes	4,405			11,890			7,586
Total current	4,518			12,171			8,708
Deferred:
Federal	(26,151		)	10,085			—
State taxes	(325		)	(196		)	—
Total deferred	(26,476		)	9,889			—
Provision for income taxes	$	(21,958	)	$	22,060		$	8,708

The tax effects of temporary differences and carryforwards that give rise to significant portions of deferred tax assets and liabilities consist of the following at December 31, 2013 and 2012 (in thousands):

	2013			2012
Deferred tax assets:
Net operating loss and capital loss carryforwards and credits	$	34,679		$	15,668
Stock compensation	3,052			1,140
Basis of investments in affiliates	867			415
Accrued liabilities and other	387			250
Unrealized loss on short-term investments	337			415
State taxes	18			212
Total deferred tax assets	39,340			18,100
Deferred tax liabilities:
Fixed assets and intangibles	(33,378		)	(39,457		)
Other	(112		)	(60		)
Net deferred tax liabilities	5,850			(21,417		)
Less:  valuation allowance	(7,585		)	(5,396		)
Net deferred taxes	$	(1,735	)	$	(26,813	)

A reconciliation of the federal statutory income tax rate and the effective income tax rate is as follows:

	2013		2012		2011
Statutory federal tax rate - (benefit) expense	(35	)%	35	%	35	%
State income and foreign taxes, net of federal tax effect	5	%	15	%	27	%
Foreign tax credit	(6	)%	(15	)%	(25	)%
Noncontrolling interests in operating subsidiaries	1	%	—	%	(1	)%
Nondeductible permanent items	2	%	5	%	4	%
Expired net operating loss carryforwards	2	%	—	%	1	%
Valuation allowance	4	%	(13	)%	(12	)%
	(27	)%	27	%	29	%

F- 22

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

At December 31, 2013 and 2012, the Company has recorded valuation allowances for certain tax attribute carryforwards and other deferred tax assets due to uncertainty regarding future realizability, as follows:

	December 31,
	2013		2012
Capital loss carryforwards	$	1,562	$	2,935
Net operating loss carryforwards	1,281		2,046
Foreign tax credits	4,405		—
Unrealized losses on short-term investments and other deferred tax assets	337		415
Total valuation allowance	$	7,585	$	5,396

Capital loss carryforwards and certain net operating loss carryforwards included in the valuation allowances for the periods presented, expire in varying amounts from 2014 through 2033. Foreign tax credits included in the valuation allowance were generated during the year ended December 31, 2013, and expire in 2023. In future periods, if the Company determines it will more likely than not be able to realize certain of these amounts, the applicable portion of the benefit from the release of the valuation allowance will generally be recognized in the statement of income in the period the determination is made.

Release of Valuation Allowance. As of December 31, 2011, Acacia maintained a full valuation allowance against its net deferred tax assets. The net deferred tax liability resulting from the acquisition of ADAPTIX in January 2012 created an additional source of income to utilize against the majority of Acacia’s existing consolidated net deferred tax assets. In addition, Acacia estimated that certain other deferred tax assets related to foreign tax credits and other state related deferreds were more likely than not realizable in future periods. Accordingly, the valuation allowance on the majority of the Company’s net deferred tax assets was released, resulting in a financial statement income tax benefit of $10,651,000 for the year ended December 31, 2012.

At December 31, 2013, Acacia had U.S. federal and state income tax NOLs totaling approximately $83,372,000 and $56,400,000, expiring between 2025 and 2033, and 2014 and 2033, respectively, for which $0 and $441,000 of federal and state net operating losses are included as a deferred tax asset which will be credited to additional paid-in capital when realized as a reduction of taxes payable on Acacia’s tax return. In addition, $1,928,000 and $37,725,000 of federal and state net operating losses are not included as a deferred tax asset and will be credited to additional paid-in capital when realized as a reduction of taxes payable on Acacia’s tax return as they relate to unrecognized excess tax benefits (see additional information regarding the ordering of windfall tax benefits and use of the “with-and-without” approach below). As of December 31, 2013, $0 and $441,000 of the valuation allowance related to the tax benefits of stock option deductions included in Acacia’s federal and state NOLs deferred tax asset, respectively.

At December 31, 2013, approximately $29,318,000 of the U.S. federal NOLs, acquired in connection with the acquisition of ADAPTIX, are subject to an annual utilization limitation of approximately $14,100,000, pursuant to the “change in ownership” provisions under Section 382 of the Internal Revenue Code of 1986, as amended (the “Code”).

As of December 31, 2013 Acacia has approximately $24,718,000 of foreign tax credits, expiring between 2015 and 2023, of which $20,313,000 has been utilized for financial statement purposes. Future realization of the credits as a reduction of taxes payable on Acacia’s tax return will result in an income tax benefit recognizable through additional paid in capital since the entire amount of the credits have been utilized for financial statement purposes under the “with-and-without approach.” In general, foreign taxes withheld may be claimed as a deduction on future U.S. corporate income tax returns, or as a credit against future U.S. income tax liabilities, subject to certain limitations.

Excluding the impact of the change in valuation allowance in fiscal years 2013, 2012 and 2011, our annual effective tax rates were (31%), 40% and 41%, respectively. In 2013, the rate at which we recorded the tax benefit associated with the pre-tax loss for the period was reduced from the statutory rate primarily due to certain nondeductible permanent items and expired capital loss carryforwards.  The Company recorded a valuation allowance on foreign tax credits generated in fiscal year 2013 totaling $4,605,000, as discussed above, and therefore, did not recognize the related tax benefit in fiscal year 2013.  The Company generated pretax income in 2012 and had significant nondeductible permanent items which increased our effective tax rate as shown above. The Company generated pretax income in fiscal year 2012, resulting in tax expense for the period. The fiscal year 2012 effective tax rate was lower than the U.S. federal statutory rate primarily due to $10.2 million of tax benefits recognized resulting from the release of valuation allowance on the majority of our net deferred tax assets in the first quarter of 2012, as discussed above.

F- 23

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The Company has elected to utilize the “with-and-without approach” regarding ordering of windfall tax benefits to determine whether the windfall tax benefit has reduced taxes payable. Under this approach, the windfall tax benefits would be recognized in additional paid in capital only if an incremental tax benefit is realized after considering all other tax benefits presently available to the Company. The deductions related to the exercise and vesting of equity-based incentive awards during the periods presented are, in general, available to offset taxable income on Acacia’s consolidated tax returns. Accordingly, the excess tax benefit related to the exercise and vesting of equity-based incentive awards for the periods presented, was credited to additional paid-in capital, not taxes payable. The actual tax benefit realized for excess tax deductions resulting from the exercise and vesting of equity-based incentive awards (noncash tax expense) totaled $13,210,000 and $583,000 for the years ended December 31, 2012 and 2011, respectively. For the year ended December 31, 2013, the Company incurred approximately $1,398,000 of net short falls from the exercise and vesting of equity-based incentive awards, of which $1,398,000 was recorded against its additional paid-in capital pool with no impact to the income statement.

Acacia is subject to taxation in the U.S. and various state jurisdictions. With no material exceptions, Acacia is no longer subject to U.S. federal or state examinations by tax authorities for years before 1997.

At December 31, 2013, the Company had total unrecognized tax benefits of approximately $2,127,000, including a recorded noncurrent liability of $85,000, related to unrecognized tax benefits primarily associated with state taxes. No interest and penalties have been recorded for the unrecognized tax benefits as of December 31, 2013. If recognized, approximately $2,127,000 would impact the Company’s effective tax rate. The Company does not expect that the liability for unrecognized tax benefits will change significantly within the next 12 months. Activity related to the gross unrecognized tax benefits for the year ended December 31, 2013 was as follows (in thousands):

Balance at January 1, 2012	$	85
Additions based on tax positions related to the current year	—
Additions for tax positions related to prior years	772
Additions resulting from the acquisition of ADAPTIX	1,270
Reductions	—
Balance at December 31, 2012	2,127
Reductions	—
Balance at December 31, 2013	$	2,127

11.  STOCK-BASED INCENTIVE PLANS

The 2002 Acacia Technologies Stock Incentive Plan (“2002 Plan”), the 2007 Acacia Technologies Stock Incentive Plan (“2007 Plan”) and the 2013 Acacia Research Corporation Stock Incentive Plan (“2013 Plan”) (collectively, the “Plans”) were approved by the stockholders of Acacia in December 2002, May 2007 and May 2013, respectively. All Plans allow grants of stock options, stock awards and performance shares with respect to Acacia common stock to eligible individuals, which generally includes directors, officers, employees and consultants. Except as noted below, the terms and provisions of the Plans are identical in all material respects. The term of the 2002 Plan expired in December 2012.

Acacia’s compensation committee administers the discretionary option grant and stock issuance programs. The compensation committee determines which eligible individuals are to receive option grants or stock issuances under those programs, the time or times when the grants or issuances are to be made, the number of shares subject to each grant or issuance, the status of any granted option as either an incentive stock option or a non-statutory stock option under the federal tax laws, the vesting schedule to be in effect for the option grant or stock issuance and the maximum term for which any granted option is to remain outstanding. The exercise price of options is generally equal to the fair market value of Acacia’s common stock on the date of grant. Options generally begin to be exercisable six months to one year after grant and generally expire ten years after grant. Stock options generally vest over two to three years and restricted shares generally vest in full after two to three years (generally representing the requisite service period). The Plans terminate no later than the tenth anniversary of the approval of the incentive plans by Acacia’s stockholders.

The Plans provide for the following separate programs:

• Discretionary Option Grant Program. Under the discretionary option grant program, Acacia’s compensation committee may grant (1) non-statutory options to purchase shares of common stock to eligible individuals in the employ or service of Acacia or its subsidiaries (including employees, non-employee board members and

F- 24

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

consultants) at an exercise price not less than 85% of the fair market value of those shares on the grant date, and (2) incentive stock options to purchase shares of common stock to eligible employees at an exercise price not less than 100% of the fair market value of those shares on the grant date (not less than 110% of fair market value if such employee actually or constructively owns more than 10% of Acacia’s voting stock or the voting stock of any of its subsidiaries).

• Stock Issuance Program. Under the stock issuance program, eligible individuals may be issued shares of common stock directly, upon the attainment of performance milestones or the completion of a specified period of service or as a bonus for past services. Under this program, the purchase price for the shares shall not be less than 100% of the fair market value of the shares on the date of issuance, and payment may be in the form of cash or past services rendered.

• Automatic Option Grant Program (2002 and 2013Plans only). Commencing in fiscal 2008, each non-employee director will receive restricted stock units for the number of shares determined by dividing the annual retainer by the closing price of Acacia’s common stock on the grant date, provided that such individual has served as a non-employee director for at least 6 months. In addition, as of May 2007, each new non-employee director will receive restricted stock units for the number of shares determined by dividing the annual board of directors retainer by the closing price of Acacia’s common stock on the commencement date. Restricted stock units vest in a series of twelve quarterly installments over the three year period following the grant date, subject to immediate acceleration upon a change in control. Acacia will deliver shares corresponding to the vested restricted stock units within thirty (30) days after the first to occur of the following events: (i) the fifth (5th) anniversary of the grant date; or (ii) termination of the non-employee director’s service as a member of the Company’s Board of Directors. The non-employee directors do not have any rights, benefits or entitlements with respect to any shares unless and until the shares have been delivered.

The number of shares of common stock available for issuance under the 2002 Plan automatically increased on the first trading day of January each calendar year during the term of the Plan by an amount equal to three percent (3%) of the total number of shares of common stock outstanding on the last trading day in December of the immediately preceding calendar year, not to exceed 500,000 shares. The aggregate number of shares of common stock available for issuance under the 2002 Plan could not exceed 20,000,000 shares. At December 31, 2013, there were no shares available for grant under the expired 2002 Plan.

The initial share reserve under the 2007 Plan was 560,000 shares. The number of shares of common stock available for issuance under the 2007 Plan automatically increased on January 1, 2008 and 2009, by an amount equal to two percent (2%) of the total number of shares of common stock outstanding on the last trading day of December in the prior calendar year. After January 1, 2009, no new additional shares will be added to the 2007 Plan without stockholder approval (except for shares subject to outstanding awards that are forfeited or otherwise returned to the 2007 Plan). At December 31, 2013, there were no shares available for grant under the 2007 Plan.

The number of shares of Common Stock initially reserved for issuance under the 2013 Plan was 4,750,000 shares. No new additional shares will be added to the 2013 Plan without security holder approval (except for shares subject to outstanding awards that are forfeited or otherwise returned to the 2013 Plan). The stock issuable under the 2013 Plan shall be shares of authorized but unissued or reacquired Common Stock, including shares repurchased by the Company on the open market. At December 31, 2013, there were 4,280,000 shares available for grant under the 2013 Plan.

Upon the exercise of stock options, the granting of restricted stock, or the delivery of shares pursuant to vested restricted stock units, it is Acacia’s policy to issue new shares of common stock. Acacia’s board of directors may amend or modify the Plans at any time, subject to any required stockholder approval.  

F- 25

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The following table summarizes stock option activity for the Plans for the year ended December 31, 2013:

			Weighted-Average
	Options		Exercise Price		Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at December 31, 2012	313,000		$	5.87
Exercised	(115,000	)	$	4.22
Expired/forfeited	(3,000	)	$	1.85
Outstanding at December 31, 2013	195,000		$	6.91	1.6 years	$	1,485,000
Vested	195,000		$	6.91	1.6 years	$	1,485,000
Exercisable at December 31, 2013	195,000		$	6.91	1.6 years	$	1,485,000

The aggregate intrinsic value of options exercised during the years ended December 31, 2013, 2012 and 2011 was $2,024,000, $1,796,000, and $2,822,000, respectively. No options vested during the years ended December 31, 2013, 2012 and 2011.

The following table summarizes nonvested restricted share activity for the year ended December 31, 2013:

	Nonvested Restricted Shares		Weighted Average Grant Date Fair Value
Nonvested restricted stock at December 31, 2012	1,353,000		$	30.17
Granted	823,000		$	24.31
Vested	(813,000	)	$	27.45
Canceled	(126,000	)	$	28.48
Nonvested restricted stock at December 31, 2013	1,237,000		$	28.23

The weighted-average grant date fair value of nonvested restricted stock granted during the years ended December 31, 2013, 2012 and 2011 was $24.31, $32.17, and $29.24, respectively. The aggregate fair value of restricted stock that vested during the years ended December 31, 2013, 2012 and 2011 was $22,317,000, $28,865,000, $11,043,000, respectively. As of December 31, 2013, the total unrecognized compensation expense related to nonvested restricted stock awards was $25,915,000, which is expected to be recognized over a weighted-average period of approximately 1.8 years.

The following table summarizes restricted stock unit activity for the year ended December 31, 2013:

	Restricted Stock Units		Weighted Average Grant Date Fair Value
Nonvested restricted stock units outstanding at December 31, 2012	38,000		$	26.98
Granted	—		$	—
Vested	(18,000	)	$	26.05
Nonvested restricted stock units outstanding at December 31, 2013	20,000		$	27.83
Vested restricted stock units outstanding at December 31, 2013	94,000		$	13.05

The weighted-average grant date fair value of restricted stock units granted during the years ended December 31, 2012 and 2011 was $29.39 and $24.87, respectively.  There were $0 shares granted during the year ended December 31, 2013. The aggregate fair value of restricted stock units that vested during the years ended December 31, 2013, 2012 and 2011 was $469,000, $363,000 and $257,000, respectively. As of December 31, 2013, the total unrecognized compensation expense related to restricted stock unit awards was $480,000, which is expected to be recognized over a weighted-average period of approximately 1.6 years.

As of December 31, 2013, 4,280,000 shares of common stock are reserved for issuance under the Plans.

F- 26

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

12.  COMMITMENTS AND CONTINGENCIES

Operating Leases

Acacia leases certain office space under various operating lease agreements expiring at various dates from 2014 through 2020. Minimum annual rental commitments for operating leases of continuing operations having initial or remaining noncancellable lease terms in excess of one year are as follows (in thousands):

Year
2014	$	1,442
2015	1,553
2016	918
2017	318
2018	324
Thereafter	498
Total minimum lease payments	$	5,053

Rent expense for the years ended December 31, 2013, 2012 and 2011 approximated $1,312,000, $898,000 and $915,000, respectively. Rental payments are expensed in the statements of operations in the period to which they relate. Scheduled rent increases are amortized on a straight-line basis over the lease term.

Inventor Royalties and Contingent Legal Expenses

In connection with the acquisition of certain patents and patent rights, certain of Acacia’s operating subsidiaries executed related agreements which grant to the former owners of the respective patents or patent rights, the right to receive inventor royalties based on future net revenues (as defined in the respective agreements) generated as a result of licensing and otherwise enforcing the respective patents or patent portfolios.

Acacia’s operating subsidiaries may retain the services of law firms that specialize in patent licensing and enforcement and patent law in connection with their licensing and enforcement activities. These law firms may be retained on a contingent fee basis whereby such law firms are paid on a scaled percentage of any negotiated fees, settlements or judgments awarded based on how and when the fees, settlements or judgments are obtained.

The economic terms of the inventor agreements, operating agreements and contingent legal fee arrangements associated with the patent portfolios owned or controlled by Acacia’s operating subsidiaries, if any, including royalty rates, contingent fee rates and other terms, vary across the patent portfolios owned or controlled by such operating subsidiaries. Inventor royalties, payments to noncontrolling interests and contingent legal fees expenses fluctuate period to period, based on the amount of revenues recognized each period, the terms and conditions of revenue agreements executed each period and the mix of specific patent portfolios with varying economic terms and obligations generating revenues each period. Inventor royalties and contingent legal fees expenses will continue to fluctuate and may continue to vary significantly period to period, based primarily on these factors.

During the years ended December 31, 2013 and 2012, Acacia entered into significant agreements with unrelated third-parties resolving pending patent matters that resulted in the grant of certain intellectual property rights and recognition of revenues, portions of which were not subject to inventor royalty and contingent legal fee arrangements, as well as the grant of licenses from certain of Acacia’s operating subsidiaries and recognition of revenues that were subject to inventor royalties and contingent legal fee arrangements. Certain revenues recognized subject to inventor royalties and contingent legal fees are based on a determination by the respective operating subsidiaries.

Patent Enforcement and Other Litigation

Acacia is subject to claims, counterclaims and legal actions that arise in the ordinary course of business. Management believes that the ultimate liability with respect to these claims and legal actions, if any, will not have a material effect on Acacia’s consolidated financial position, results of operations or cash flows. Certain of Acacia’s operating subsidiaries are often required to engage in litigation to enforce their patents and patent rights. In connection with any of Acacia’s operating subsidiaries’ patent enforcement actions, it is possible that a defendant may request and/or a court may rule that an operating subsidiary has violated statutory authority, regulatory authority, federal rules, local court rules, or governing standards relating

F- 27

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

to the substantive or procedural aspects of such enforcement actions. In such event, a court may issue monetary sanctions against Acacia or its operating subsidiaries or award attorney’s fees and/or expenses to a defendant(s), which could be material, and if required to be paid by Acacia or its operating subsidiaries, could materially harm the Company’s operating results and financial position.

Guarantees and Indemnifications

Certain of Acacia’s operating subsidiaries have made guarantees and indemnities under which they may be required to make payments to a guaranteed or indemnified party, in relation to certain transactions, including revenue transactions in the ordinary course of business. In connection with certain facility leases, Acacia and certain of its operating subsidiaries have indemnified lessors for certain claims arising from the facilities or the leases. Acacia indemnifies its directors and officers to the maximum extent permitted under the laws of the State of Delaware. However, Acacia has a directors and officers insurance policy that may reduce its exposure in certain circumstances and may enable it to recover a portion of future amounts that may be payable, if any. The duration of the guarantees and indemnities varies and, in many cases is indefinite but subject to statute of limitations. The majority of guarantees and indemnities do not provide any limitations of the maximum potential future payments that Acacia could be obligated to make. To date, Acacia has made no payments related to these guarantees and indemnities. Acacia estimates the fair value of its indemnification obligations to be insignificant based on this history and therefore, have not recorded any liability for these guarantees and indemnities in the accompanying consolidated balance sheets.

Other

In August 2010, a wholly owned subsidiary of Acacia became the general partner of the Acacia IP Fund, which was formed in August 2010. The Acacia IP Fund is authorized to raise up to $250 million. The Acacia IP Fund acquires, licenses and enforces intellectual property consisting primarily of patents, patent rights, and patented technologies. Refer to Note 2 to these notes to consolidated financial statements for information regarding the consolidation of majority-owned subsidiaries and the presentation of related noncontrolling interests. At December 31, 2013 and 2012, the Acacia IP Fund net assets were primarily comprised of the following (in thousands):

	December 31, 2013		December 31, 2012
Cash and other assets	$	2,927	$	2,542
Patents, net of accumulated amortization	1,373		7,144
Investments - noncurrent	11,120		11,617
Total assets	$	15,420	$	21,303
Accrued expenses and contributions	$	2,437	$	5,016
Accrued patent acquisition costs	—		500
Total liabilities	2,437		5,516
Net assets	$	12,983	$	15,787

13.  RETIREMENT SAVINGS PLAN AND EXECUTIVE SEVERANCE POLICY

Retirement Savings Plan.  Acacia has an employee savings and retirement plan under section 401(k) of the Code (the “Plan”). The Plan is a defined contribution plan in which eligible employees may elect to have a percentage of their compensation contributed to the Plan, subject to certain guidelines issued by the Internal Revenue Service. Acacia may contribute to the Plan at the discretion of the board of directors. There were no contributions made by Acacia during the periods presented.

Executive Severance Policy.  Under Acacia’s Amended Executive Severance Policy, full-time employees with the title of Senior Vice President and higher (“Officer”) are entitled to receive certain benefits upon termination of employment. If employment of an Officer is terminated for other than cause or other than on account of death or disability, Acacia will (i) promptly pay to the Officer a lump sum amount equal to the aggregate of (a) accrued obligations (i.e., the Officer’s annual base salary through the date of termination to the extent not theretofore paid and any compensation previously deferred by the Officer (together with any accrued interest or earnings thereon) and any accrued vacation pay, and reimbursable expenses, in each case to the extent not theretofore paid) and (b) three (3) months of the Officer’s base salary for each full year that the

F- 28

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Officer was employed by the Company (the “Severance Period”), up to a maximum of twelve (12) months of the Officer’s base salary, and (ii) provide to the Officer, Acacia paid COBRA coverage for the medical and dental benefits selected by the Officer in the year in which the termination occurs, for the duration of the Severance Period.

14.  SUPPLEMENTAL CASH FLOW INFORMATION

Estimated federal taxes paid totaled $3,000,000, $0 and $0 for the years ended December 31, 2013, 2012 and 2011, respectively. At December 31, 2013, prepaid expenses and other current assets included federal and state income taxes receivable totaling $3,251,000. Cash paid for state income taxes totaled $516,000, $771,000 and $185,000 for the years ended December 31, 2013, 2012 and 2011, respectively. Foreign taxes withheld totaled $4,605,000, $11,890,000 and $7,586,000 for the years ended December 31, 2013, 2012 and 2011.

Refer to Note 6 to these notes to consolidated financial statements for information regarding noncash investing activity related to the acquisition of patents for the periods presented. Cash flows from financing activities for the year ended December 31, 2012 exclude $504,000 of accrued distributions payable to noncontrolling interests.

F- 29

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

15.  QUARTERLY FINANCIAL DATA (unaudited)

The following table sets forth unaudited consolidated statements of operations data for the eight quarters in the period ended December 31, 2013. This information has been derived from Acacia’s unaudited condensed consolidated financial statements that have been prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, include all adjustments, consisting of normal recurring adjustments, necessary for a fair statement of the information when read in conjunction with the audited consolidated financial statements and related notes thereto. Acacia’s quarterly results have been, and may in the future be, subject to significant fluctuations. As a result, Acacia believes that results of operations for interim periods should not be relied upon as any indication of the results to be expected in any future periods.

	Quarter Ended
	Mar. 31,			Jun. 30,			Sept. 30,			Dec. 31,			Mar. 31,			Jun. 30,			Sept. 30,			Dec. 31,
	2013			2013			2013			2013			2012			2012			2012			2012
	(Unaudited, in thousands, except share and per share information)
Revenues	$	76,861		$	23,110		$	15,520		$	15,065		$	99,040		$	50,484		$	34,939		$	66,264
Operating costs and expenses:
Cost of revenues:
Inventor royalties	18,481			5,610			2,353			3,280			7,594			9,573			5,032			3,829
Contingent legal fees	15,032			4,024			2,547			3,181			3,748			6,607			8,833			5,463
Litigation and licensing expenses - patents	9,648			9,918			10,870			8,899			3,381			5,268			5,973			6,969
Amortization of patents	11,730			12,578			12,615			16,735			5,126			5,393			10,412			18,088
Marketing, general and administrative expenses (including non-cash stock compensation expense)	13,844			13,175			18,222			13,988			13,731			11,903			11,914			16,535
Research, consulting and other expenses - business development	1,031			735			743			742			1,116			1,967			1,139			721
Other	—			—			3,506			—			—			—			—			—
Total operating costs and expenses	69,766			46,040			50,856			46,825			34,696			40,711			43,303			51,605
Operating income (loss)	7,095			(22,930		)	(35,336		)	(31,760		)	64,344			9,773			(8,364		)	14,659
Total other income (expense)	1,290			400			280			161			56			102			(41		)	820
Income (loss) before (provision for) benefit from income taxes	8,385			(22,530		)	(35,056		)	(31,599		)	64,400			9,875			(8,405		)	15,479
Benefit from (provision for) income taxes	(3,272		)	9,050			19,570			(3,390		)	(14,747		)	(3,494		)	1,938			(5,757		)
Net income (loss) including noncontrolling interests	5,113			(13,480		)	(15,486		)	(34,989		)	49,653			6,381			(6,467		)	9,722
Net (income) loss attributable to noncontrolling interests	—			977			(225		)	1,656			275			(60		)	(152		)	101
Net income (loss) attributable to Acacia Research Corporation	$	5,113		$	(12,503	)	$	(15,711	)	$	(33,333	)	$	49,928		$	6,321		$	(6,619	)	$	9,823
Net income (loss) per common share attributable to Acacia Research Corporation:
Basic income (loss) per share - As Adjusted(1)	$	0.10		$	(0.26	)	$	(0.33	)	$	(0.69	)	$	1.08		$	0.13		$	(0.14	)	$	0.20
Diluted income (loss) per share - As Adjusted(1)	$	0.10		$	(0.26	)	$	(0.33	)	$	(0.69	)	$	1.08		$	0.13		$	(0.14	)	$	0.20
Weighted-average number of shares outstanding, basic - As Adjusted(1)	47,859,774			48,008,998			48,330,149			48,415,684			44,367,499			47,944,193			48,332,878			48,335,865
Weighted-average number of shares outstanding, diluted - As Adjusted(1)	48,104,242			48,008,998			48,330,149			48,415,684			44,764,064			48,294,782			48,332,878			48,607,141

F- 30

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

	Quarter Ended
	Mar. 31,		Jun. 30,			Sept. 30,	Dec. 31,	Mar. 31,		Jun. 30,		Sept. 30,			Dec. 31,
	2013		2013			2013	2013	2012		2012		2012			2012
	(Unaudited, In thousands, except share and per share information)
Basic income (loss) per share - As Reported(1)	$	0.11	$	(0.26	)	N/A	N/A	$	1.13	$	0.13	$	(0.14	)	$	0.20
Diluted income (loss) per share - As Reported(1)	$	0.11	$	(0.26	)	N/A	N/A	$	1.09	$	0.13	$	(0.14	)	$	0.20
Weighted-average number of shares outstanding, basic - As Reported(1)	47,859,774		48,008,998			N/A	N/A	44,367,499		47,944,193		48,332,878			48,335,865
Weighted-average number of shares outstanding, diluted - As Reported(1)	48,354,444		48,008,998			N/A	N/A	45,771,228		48,938,766		48,332,878			48,797,304

_______________________

(1) - Revision of Prior Period Earnings (Loss) Per Share - Two-Class Method. In connection with the preparation of the Company’s Quarterly Report on Form 10-Q as of and for the three months ended September 30, 2013, the Company determined that its basic and diluted net income (loss) per share calculations should have been prepared using the “two-class method.” Under the two-class method, securities that participate in dividends are considered “participating securities.” The Company’s unvested restricted shares outstanding are considered “participating securities” because they include non-forfeitable rights to dividends.

Pursuant to guidance set forth in Staff Accounting Bulletin (“SAB”) No. 99, “Materiality,” the Company concluded that the errors were not material to any of its prior period financial statements. Although the errors were immaterial to prior periods, the prior period financial statements presented herein were revised, in accordance with SAB No. 108, “Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements.”

F- 31

EXHIBIT INDEX

Exhibit Number	Description
2.1	Agreement and Plan of Merger, dated November 22, 2011, by and among Acacia Research Group LLC, Apollo Patent Corp., Adaptix, Inc., and Baker Communications Fund II (QP), L.P., solely in its capacity as representative for the shareholders of Adaptix, Inc.(15)
3.1	Amended and Restated Certificate of Incorporation (1)
3.2	Amended and Restated Bylaws
10.1*	Acacia Research Corporation 1996 Stock Option Plan, as amended (2)
10.2*	Form of Option Agreement constituting the Acacia Research Corporation 1996 Executive Stock Bonus Plan (3)
10.3*	2002 Acacia Technologies Stock Incentive Plan (4)
10.4*	2007 Acacia Technologies Stock Incentive Plan (5)
10.5*	Form of Acacia Technologies Stock Option Agreement for the 2007 Acacia Technologies Stock Incentive Plan (6)
10.6*	Form of Acacia Technologies Stock Issuance Agreement for the 2002 Acacia Technologies Stock Incentive Plan (6)
10.7*	Form of Acacia Technologies Stock Issuance Agreement for the 2007 Acacia Technologies Stock Incentive Plan (6)
10.8	Office Space Lease dated January 28, 2002, between Acacia Research Corporation and The Irvine Company (7)
10.9	Form of Indemnification Agreement (8)
10.10	Third Amendment to Lease dated January 28, 2002 between Acacia Research Corporation and the Irvine Company (9)
10.11*	Employment Agreement, dated April 12, 2004, by and between Acacia Media Technologies Corporation and Edward Treska (10)
10.11.1*	Addendum, dated March 31, 2008, to Employment Agreement by and between Acacia Media Technologies Corporation and Edward Treska (11)
10.12	Fourth Amendment to Lease dated January 28, 2002 between Acacia Research Corporation and the Irvine Company (10)
10.13	Fifth Amendment to Lease dated January 28, 2002 between Acacia Research Corporation and the Irvine Company (10)
10.14*	Employment Agreement, dated March 31, 2008, by and between Acacia Technologies, LLC and Paul Ryan (12)
10.14.1*	Amendment to Employment Agreement, dated December 17, 2008, by and between Acacia Technologies, LLC and Paul Ryan (12)
10.15*	Employment Agreement, dated March 31, 2008, by and between Acacia Technologies, LLC and Robert L. Harris (11)
10.15.1*	Amendment to Employment Agreement, dated December 17, 2008, by and between Acacia Technologies, LLC and Robert L. Harris (12)
10.16*	Amended Employment Agreement, dated March 31, 2008, by and between Acacia Technologies, LLC and Clayton J. Haynes (11)
10.16.1*	Amendment to Amended Employment Agreement, dated December 17, 2008, by and between Acacia Technologies, LLC and Clayton J. Haynes (12)
10.17*	Acacia Research Corporation Amended and Restated Executive Severance Policy (12)
10.18	Sixth Amendment to Lease dated January 28, 2002 between Acacia Research Corporation and the Irvine Company (14)
10.19	Form of Purchase Agreement (16)
10.20*	2013 Acacia Research Corporation Stock Incentive Plan (18)
10.21*	Form of Stock Issuance Agreement to be used under the 2013 Acacia Research Corporation Stock Incentive Plan (19)
10.22*	Employment Agreement, dated October 28, 2006, by and between Acacia Technologies Services Corporation and Matthew Vella (20)
18.1	Preferability Letter dated February 25, 2010 from Grant Thornton LLP, independent registered public accounting firm, regarding change in accounting principle (13)
21.1	List of Subsidiaries

F- 32

23.1	Consent of Independent Registered Public Accounting Firm
24.1	Power of Attorney (included in the signature page hereto).
31.1	Certification of Chief Executive Officer Pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934
31.2	Certification of Chief Financial Officer Pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934
32.1	Certification of Chief Executive Officer Pursuant to Rule 13a-14(b)/15d-14(b) of the Securities Exchange Act of 1934 and 18 U.S.C. Section 1350
32.2	Certification of Chief Financial Officer Pursuant to Rule 13a-14(b)/15d-14(b) of the Securities Exchange Act of 1934 and 18 U.S.C. Section 1350
101	Interactive Date Files Pursuant to Rule 405 of Regulation S-T.

 ___________________________

* The referenced exhibit is a management contract, compensatory plan or arrangement required to be filed as an exhibit to this Annual Report on Form 10-K pursuant to Item 15(c) of Form 10-K.

(1) Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on June 5, 2008 (File No. 000-26068).

(2) Incorporated by reference to Appendix A to Acacia Research Corporation’s Definitive Proxy Statement on Schedule 14A filed on April 20, 2000 (File No. 000-26068).

(3) Incorporated by reference to Appendix A to Acacia Research Corporation’s Definitive Proxy Statement on Schedule 14A filed on April 26, 1996 (File No. 000-26068).

(4) Incorporated by reference to Annex E to the Proxy Statement/Prospectus which formed part of Acacia Research Corporation’s Registration Statement on Form S-4 (File No. 333-87654) which became effective on November 8, 2002.

(5) Incorporated by reference to Acacia Research Corporation’s Registration Statement on Form S-8 (File No. 333-144754) which became effective on July 20, 2007.

(6) Incorporated by reference to Acacia Research Corporation’s Quarterly Report on Form 10-Q for the period ended September 30, 2007, filed on November 2, 2007 (File No. 000-26068).

(7) Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10‑K for the year ended December 31, 2001, filed on March 27, 2002 (File No. 000‑26068).

(8) Incorporated by reference to Acacia Research Corporation’s Quarterly Report on Form 10-Q for the period ended June 30, 2012, filed on July 30, 2012 (File No. 000-26068).

(9) Incorporated by reference to Acacia Research Corporation’s Quarterly Report on Form 10-Q for the period ended March 31, 2006, filed on May 10, 2006 (File No. 000‑26068).

(10) Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10-K for the year ended December 31, 2007, filed on March 14, 2008 (File No. 000-26068).

(11) Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on April 2, 2008 ( File No. 000-26068).

(12) Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10-K for the year ended December 31, 2008, filed on February 26, 2009 (File No. 000-26068).

(13) Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10-K for the year ended December 31, 2009, filed on February 26, 2010, as amended on March 1, 2010 (File No. 000-26068)

F- 33

(14) Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10-K for the year ended December 31, 2010, filed on February 28, 2011, as amended on March 24, 2011 (File No. 000-26068).

(15) Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K/A filed on January 19, 2012 (File No. 000-26068). Portions of this exhibit have been omitted pursuant to a request for confidential treatment under Rule 24-b-2 of the Securities Exchange Act of 1934, as amended. The omitted material has been separately filed with the Securities and Exchange Commission.

(16) Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on February 16, 2012 (File No. 000-26068).

(17) Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10-K for the year ended December 31, 2012, filed on February 28, 2013 (File No. 000-26068).

(18) Incorporated by reference to Appendix A to Acacia Research Corporation’s Definitive Proxy Statement on Schedule 14A filed on April 24, 2013 (File No. 000-26068).

(19) Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on May 22, 2013 (File No. 000-26068).

(20) Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on July 5, 2013 (File No. 000-26068).

F- 34

EX-21.1

EXHIBIT 21.1

SUBSIDIARIES OF THE REGISTRANT

The following is a listing of the significant subsidiaries of Acacia Research Corporation:

	Jurisdiction of Incorporation
Acacia Global Acquisition LLC and subsidiaries	Delaware
Acacia Research Group, LLC, formerly Acacia Patent Acquisition, LLC and subsidiaries	Delaware

Acacia Global Acquisition LLC and Acacia Research Group, LLC, wholly own multiple consolidated operating subsidiaries, that are included in Acacia Research Corporation's consolidated financial statements included elsewhere herein, each of which are separate and distinct legal entities, and all of which are in the patent acquisition, development, licensing and enforcement business.  All of the operating subsidiaries wholly owned by Acacia Global Acquisition LLC and Acacia Research Group, LLC operate in the United States.

EX-23.1

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We have issued our reports dated March 3, 2014, with respect to the consolidated financial statements and internal control over financial reporting included in the Annual Report of Acacia Research Corporation on Form 10-K for the year ended December 31, 2013. We hereby consent to the incorporation by reference of said reports in the Registration Statements of Acacia Research Corporation on Forms S-3 (File No. 333-122452, effective February 1, 2005, File No. 333-157623, effective April 27, 2010, File No. 333-173045, effective March 24, 2011, File No. 333-180858, effective April 20, 2012) and on Forms S-8 (File No. 333-102181, effective December 23, 2002, File No. 333-109352, effective October 1, 2003, File No. 333-119811, effective October 19, 2004, File No. 333-127583, effective August 16, 2005, File No. 333-131463, effective February 1, 2006, File No. 333-140280, effective January 29, 2007, File No. 333-144754, effective July 20, 2007, File No. 333-149849, effective March 21, 2008, File No. 333-157626, effective March 2, 2009, File No. 333-165110, effective March 1, 2010, File No. 333-172538, effective March 1, 2011, File No. 333-179010, effective January 13, 2012, File No. 333-189135, effective June 6, 2013).

/s/ GRANT THORNTON LLP

Irvine, California

March 3, 2014

EX-31.1

EXHIBIT 31.1

CERTIFICATION

I, Matthew Vella, certify that:

1. I have reviewed this Annual Report on Form 10-K of Acacia Research Corporation;

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 the 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.

Dated:	March 3, 2014	/s/ Matthew Vella
		Matthew Vella Chief Executive Officer (Principal Executive Officer)

EX-31.2

EXHIBIT 31.2

CERTIFICATION

I, Clayton J. Haynes, certify that:

1. I have reviewed this Annual Report on Form 10-K of Acacia Research Corporation;

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 the 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.

Dated:	March 3, 2014	/s/ Clayton J. Haynes
		Clayton J. Haynes Chief Financial Officer (Principal Financial Officer)

EX-32.1

EXHIBIT 32.1

CERTIFICATION

In connection with the Annual Report of Acacia Research Corporation (the “Company”) on Form 10-K for the fiscal year ended December 31, 2013, as filed with the Securities and Exchange Commission on March 3, 2014 (the “Report”), I, Matthew Vella, Chief Executive Officer of the Company, certify, pursuant to Rule 13a-14(b) or Rule 15d-14(b) under the Securities Exchange Act of 1934 (15 U.S.C. 78m or 780(d)) and 18 U.S.C. Section 1350, that to the best of my knowledge:

1.    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

By:	/s/ Matthew Vella
	Matthew Vella
	Chief Executive Officer
	March 3, 2014

This certification accompanies this Report pursuant to Rule 13a-14(b) or Rule 15d-14(b) under the Securities Exchange Act of 1934 and 18 U.S.C. Section 1350 and shall not be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934.

EX-32.2

EXHIBIT 32.2

CERTIFICATION

In connection with the Annual Report of Acacia Research Corporation (the “Company”) on Form 10-K for the fiscal year ended December 31, 2013, as filed with the Securities and Exchange Commission on March 3, 2014 (the “Report”), I, Clayton J. Haynes, Chief Financial Officer of the Company, certify, pursuant to Rule 13a-14(b) or Rule 15d-14(b) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 780(d)) and 18 U.S.C. Section 1350, that to the best of my knowledge:

1.    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

By:	/s/ Clayton J. Haynes
	Clayton J. Haynes
	Chief Financial Officer
	March 3, 2014

This certification accompanies this Report pursuant to Rule 13a-14(b) or Rule 15d-14(b) under the Securities Exchange Act of 1934 and 18 U.S.C. Section 1350 and shall not be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934.

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Summary of Significant Accounting Policies Concentrations (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Licensee 1 [Member] | Revenue, Rights Granted [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	38.00%	21.00%	26.00%
Licensee 1 [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	60.00%	34.00%
Licensee 2 [Member] | Revenue, Rights Granted [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	16.00%	14.00%	17.00%
Licensee 2 [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	22.00%	30.00%
Licensee 3 [Member] | Revenue, Rights Granted [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		10.00%	15.00%
Licensee 3 [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		25.00%
Licensee 4 [Member] | Revenue, Rights Granted [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		10.00%
Licensees in foreign jurisdictions [Member] | Revenue, Rights Granted [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	24.00%	43.00%	49.00%

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Acquisition Pro Forma Information (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Business Combinations [Abstract]
Pro forma revenues	$ 250,727	$ 172,256
Pro forma total operating costs and expenses	170,953	159,674
Pro forma operating income	79,774	12,582
Pro forma interest and investment income	937	96
Pro forma income from operations before provision for income taxes	80,711	12,678
Pro forma provision for income taxes	(22,060)	(8,708)
Pro forma net income including noncontrolling interests	58,651	3,970
Pro forma net (income) loss attributable to noncontrolling interests	164	(539)
Pro forma net income attributable to Acacia Research Corporation	$ 58,815	$ 3,431
Pro forma income per common share attributable to Acacia Research Corporation [Abstract]
Pro forma basic earnings per share	$ 1.24
Pro forma diluted earnings per share	$ 1.22
Pro forma weighted average number of shares outstanding, basic	47,251,061
Pro forma weighted average number of shares outstanding, diluted	48,060,647

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Goodwill and Other Identifiable Intangible Assets Cost and Accumulated Amortization (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Patents [Line Items]
Patents, net	$ 288,432	$ 313,529
Patent cost, disposals	3,500	5,500	4,612
Accumulated amortization, disposals	1,753	2,466	3,509
Proceeds from Sale of Intangible Assets	1,000	2,792	11,000
Other costs, related to patent-related sales and disposals	0	0	4,717
Patents [Member]
Patents [Line Items]
Gross carrying amount - patents	400,755	383,379
Accumulated amortization - patents	112,323	69,850
Patents, net	$ 288,432	$ 313,529

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Quarterly Financial Data (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
QUARTERLY FINANCIAL DATA (unaudited) [Abstract]
Revenues	$ 15,065	$ 15,520	$ 23,110	$ 76,861	$ 66,264	$ 34,939	$ 50,484	$ 99,040
Inventor royalties	3,280	2,353	5,610	18,481	3,829	5,032	9,573	7,594	29,724	26,028	43,727
Contingent legal fees	3,181	2,547	4,024	15,032	5,463	8,833	6,607	3,748	24,784	24,651	40,281
Litigation and licensing expenses - patents	8,899	10,870	9,918	9,648	6,969	5,973	5,268	3,381	39,335	21,591	13,005
Amortization of patents	16,735	12,615	12,578	11,730	18,088	10,412	5,393	5,126	53,658	39,019	9,745
Marketing, general and administrative expenses (including non-cash stock compensation expense)	(13,988)	(18,222)	(13,175)	(13,844)	(16,535)	(11,914)	(11,903)	(13,731)	(59,229)	(54,083)	(35,693)
Research, consulting and other expenses - business development	742	743	735	1,031	721	1,139	1,967	1,116	3,251	4,943	4,338
Other	0	3,506	0	0	0	0	0	0	3,506	0	0
Total operating costs and expenses	46,825	50,856	46,040	69,766	51,605	43,303	40,711	34,696	213,487	170,315	141,999
Operating income (loss)	(31,760)	(35,336)	(22,930)	7,095	14,659	(8,364)	9,773	64,344	(82,931)	80,412	30,257
Total other income (expense)	161	280	400	1,290	820	(41)	102	56	2,131	937	96
Income (loss) from operations before benefit from (provision for) income taxes	(31,599)	(35,056)	(22,530)	8,385	15,479	(8,405)	9,875	64,400	(80,800)	81,349	30,353
(Provision) benefit for income taxes	(3,390)	19,570	9,050	(3,272)	(5,757)	1,938	(3,494)	(14,747)	21,958	(22,060)	(8,708)
Net income (loss) including noncontrolling interests in operating subsidiaries	(34,989)	(15,486)	(13,480)	5,113	9,722	(6,467)	6,381	49,653	(58,842)	59,289	21,645
Net (income) loss attributable to noncontrolling interests	1,656	(225)	977	0	101	(152)	(60)	275	2,408	164	(539)
Net Income (Loss) Attributable to Acacia Research Corporation	$ (33,333)	$ (15,711)	$ (12,503)	$ 5,113	$ 9,823	$ (6,619)	$ 6,321	$ 49,928	$ (56,434)	$ 59,453	$ 21,106
Basic income (loss) per share - As Adjusted(1)	$ (0.69)	$ (0.33)	$ (0.26)	$ 0.10	$ 0.20	$ (0.14)	$ 0.13	$ 1.08	$ (1.18)	$ 1.22	$ 0.51
Diluted income (loss) per share - As Adjusted(1)	$ (0.69)	$ (0.33)	$ (0.26)	$ 0.10	$ 0.20	$ (0.14)	$ 0.13	$ 1.08	$ (1.18)	$ 1.21	$ 0.50
Weighted-average number of shares outstanding, basic - As Adjusted(1)	48,415,684	48,330,149	48,008,998	47,859,774	48,335,865	48,332,878	47,944,193	44,367,499	48,155,832	47,251,061	39,743,433
Weighted-average number of shares outstanding, diluted - As Adjusted(1)	48,415,684	48,330,149	48,008,998	48,104,242	48,607,141	48,332,878	48,294,782	44,764,064	48,155,832	47,584,120	40,150,600
Earnings (loss) per share, basic, as previously reported			$ (0.26)	$ 0.11	$ 0.20	$ (0.14)	$ 0.13	$ 1.13
Earnings (loss) per share, diluted as previously reported			$ (0.26)	$ 0.11	$ 0.20	$ (0.14)	$ 0.13	$ 1.09
Weighted average number of shares, basic, as previously reported			48,008,998	47,859,774	48,335,865	48,332,878	47,944,193	44,367,499
Weighted average number of shares, diluted, as previously reported			48,008,998	48,354,444	48,797,304	48,332,878	48,938,766	45,771,228

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Stockholders' Equity (Details) (USD $)	0 Months Ended				3 Months Ended	12 Months Ended				0 Months Ended		12 Months Ended
	Mar. 30, 2014	Nov. 15, 2013	Nov. 16, 2012	Feb. 21, 2012	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 30, 2011	Feb. 21, 2012 Common Stock [Member]	Mar. 30, 2011 Common Stock [Member]	Dec. 31, 2011 Common Stock [Member]
Stockholders Equity [Line Items]
Gross proceeds from the sale of common stock				$ 225,000,000
Sale of common stock, shares										0	6,122,449	5,750,000
Sale of common stock, price per share				$ 36.75					$ 31.50
Proceeds from Issuance of Common Stock						0	218,961,000	175,229,000
Stock repurchase program, authorized amount		70,000,000	100,000,000
Dividends declared, per share						$ 0.50
Common stock dividends declared, quarterly	$ 0.125					$ 0.125
Dividends paid						$ 18,633,000	$ 0	$ 0
Dividends, payment date					Mar. 31, 2014
Dividends, record date					Mar. 03, 2014

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Accounts Payable and Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts Payable and Accrued Liabilities, Current [Abstract]
Accounts payable	$ 128	$ 642
Payroll and other employee benefits	1,039	1,815
Accrued vacation	813	703
Accrued legal expenses - patent	5,900	3,990
Accrued consulting and other professional fees	2,948	1,510
Accrued distribution to noncontrolling interest	504	504
Other accrued liabilities	223	71
Accounts payable and accrued expenses	$ 11,555	$ 9,235

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

Acacia’s provision for income taxes consists of the following (in thousands): 

	2013			2012			2011
Current:
Federal	$	—		$	—		$	179
State taxes	113			281			943
Foreign taxes	4,405			11,890			7,586
Total current	4,518			12,171			8,708
Deferred:
Federal	(26,151		)	10,085			—
State taxes	(325		)	(196		)	—
Total deferred	(26,476		)	9,889			—
Provision for income taxes	$	(21,958	)	$	22,060		$	8,708

Schedule of Deferred Tax Assets and Liabilities

The tax effects of temporary differences and carryforwards that give rise to significant portions of deferred tax assets and liabilities consist of the following at December 31, 2013 and 2012 (in thousands):

	2013			2012
Deferred tax assets:
Net operating loss and capital loss carryforwards and credits	$	34,679		$	15,668
Stock compensation	3,052			1,140
Basis of investments in affiliates	867			415
Accrued liabilities and other	387			250
Unrealized loss on short-term investments	337			415
State taxes	18			212
Total deferred tax assets	39,340			18,100
Deferred tax liabilities:
Fixed assets and intangibles	(33,378		)	(39,457		)
Other	(112		)	(60		)
Net deferred tax liabilities	5,850			(21,417		)
Less:  valuation allowance	(7,585		)	(5,396		)
Net deferred taxes	$	(1,735	)	$	(26,813	)

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation of the federal statutory income tax rate and the effective income tax rate is as follows:

	2013		2012		2011
Statutory federal tax rate - (benefit) expense	(35	)%	35	%	35	%
State income and foreign taxes, net of federal tax effect	5	%	15	%	27	%
Foreign tax credit	(6	)%	(15	)%	(25	)%
Noncontrolling interests in operating subsidiaries	1	%	—	%	(1	)%
Nondeductible permanent items	2	%	5	%	4	%
Expired net operating loss carryforwards	2	%	—	%	1	%
Valuation allowance	4	%	(13	)%	(12	)%
	(27	)%	27	%	29	%

Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]

ctivity related to the gross unrecognized tax benefits for the year ended December 31, 2013 was as follows (in thousands):

Balance at January 1, 2012	$	85
Additions based on tax positions related to the current year	—
Additions for tax positions related to prior years	772
Additions resulting from the acquisition of ADAPTIX	1,270
Reductions	—
Balance at December 31, 2012	2,127
Reductions	—
Balance at December 31, 2013	$	2,127

Summary of Valuation Allowance [Table Text Block]

At December 31, 2013 and 2012, the Company has recorded valuation allowances for certain tax attribute carryforwards and other deferred tax assets due to uncertainty regarding future realizability, as follows:

	December 31,
	2013		2012
Capital loss carryforwards	$	1,562	$	2,935
Net operating loss carryforwards	1,281		2,046
Foreign tax credits	4,405		—
Unrealized losses on short-term investments and other deferred tax assets	337		415
Total valuation allowance	$	7,585	$	5,396

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Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Income tax benefit from release of valuation allowance	$ (2,189,000)	$ 10,651,000	$ 0
Operating loss carryforwards, federal	83,372,000
Operating loss carryforwards, state	56,400,000
Deferred tax assets, valuation allowance	7,585,000	5,396,000
Federal NOL annual utilization limit	14,100,000
Net operating losses, unrecognized excess tax benefits, federal	1,928,000
Net operating losses, unrecognized excess tax benefits, state	37,725,000
Tax benefit from stock options exercised, federal	0
Tax fenefit from stock options exercised, state	441,000
Foreign withholding taxes	4,605,000	11,890,000	7,586,000
Excess tax benefits from stock-based compensation	(1,398,000)	13,210,000	583,000
Foreign tax credits, additional paid in capital benefit	24,718,000
Foreign tax credits utilized for financial statement purposes	20,313,000
Effective Income Tax Rate Reconciliation, Percent	(27.00%)	27.00%	29.00%
Effective tax rate excluding valuation allowance	31.00%	40.00%	41.00%
Unrecognized tax benefits	2,127,000	2,127,000	85,000
unrecognized tax benefits primarily associated with state taxes	85,000
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Net operating losses included in deferred tax assets	0
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Net operating losses included in deferred tax assets	441,000
Capital Loss Carryforward Related to Business Acquisition [Member] | Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards	$ 29,318,000

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Treasury Stock [Policy Text Block]

Treasury Stock. Repurchases of the Company’s outstanding common stock are accounted for using the cost method. The applicable par value is deducted from the appropriate capital stock account on the formal or constructive retirement of treasury stock. Any excess of the cost of treasury stock over its par value is charged to additional paid-in capital, and reflected as Treasury Stock on the consolidated balance sheets.

Fiscal Period

Accounting Principles and Fiscal Year End.  The consolidated financial statements and accompanying notes are prepared on the accrual basis of accounting in accordance with generally accepted accounting principles in the United States of America. Acacia has a December 31 fiscal year end.

Consolidation, Subsidiaries or Other Investments, Consolidated Entities

Principles of Consolidation.  The accompanying consolidated financial statements include the accounts of Acacia and its wholly and majority-owned and controlled subsidiaries. Material intercompany transactions and balances have been eliminated in consolidation.

Net income (loss) attributable to noncontrolling interest

Noncontrolling interests in Acacia’s majority-owned and controlled operating subsidiaries (“noncontrolling interests”) are separately presented as a component of stockholders’ equity in the consolidated statements of stockholders’ equity for the applicable periods presented. Consolidated net income or (loss) is adjusted to include the net (income) or loss attributed to noncontrolling interests in the consolidated statements of operations for the applicable periods presented. Refer to the accompanying consolidated statements of stockholders’ equity for total noncontrolling interests for the applicable periods presented.

In August 2010, a wholly owned subsidiary of Acacia became the general partner of the Acacia Intellectual Property Fund, L.P. (the “Acacia IP Fund”), which was formed in August 2010. The Acacia IP Fund is included in the Company’s consolidated financial statements for the periods presented, as Acacia’s wholly owned subsidiary, as the general partner, has the ability to control the operations and activities of the Acacia IP Fund. Refer to Note 12 to these consolidated financial statements.

Revenue Recognition

Revenue Recognition.  Revenue is recognized when (i) persuasive evidence of an arrangement exists, (ii) all obligations have been substantially performed pursuant to the terms of the arrangement, (iii) amounts are fixed or determinable, and (iv) the collectibility of amounts is reasonably assured.

In general, revenue arrangements provide for the payment of contractually determined fees in consideration for the grant of certain intellectual property rights for patented technologies owned or controlled by Acacia’s operating subsidiaries. These rights typically include some combination of the following: (i) the grant of a non-exclusive, retroactive and future license to manufacture and/or sell products covered by patented technologies owned or controlled by Acacia’s operating subsidiaries, (ii) a covenant-not-to-sue, (iii) the release of the licensee from certain claims, and (iv) the dismissal of any pending litigation. The intellectual property rights granted may be perpetual in nature, extending until the expiration of the related patents, or can be granted for a defined, relatively short period of time, with the licensee possessing the right to renew the agreement at the end of each contractual term for an additional minimum upfront payment. Pursuant to the terms of these agreements, Acacia’s operating subsidiaries have no further obligation with respect to the grant of the non-exclusive retroactive and future licenses, covenants-not-to-sue, releases, and other deliverables, including no express or implied obligation on Acacia’s operating subsidiaries’ part to maintain or upgrade the technology, or provide future support or services. Generally, the agreements provide for the grant of the licenses, covenants-not-to-sue, releases, and other significant deliverables upon execution of the agreement, or upon receipt of the minimum upfront payment for term agreement renewals. As such, the earnings process is complete and revenue is recognized upon the execution of the agreement, when collectibility is reasonably assured, or upon receipt of the minimum upfront fee for term agreement renewals, and when all other revenue recognition criteria have been met.

Certain of the Company’s revenue arrangements provide for future royalties or additional required payments based on future licensee activities. Additional royalties are recognized in revenue upon resolution of the related contingency provided that all revenue recognition criteria, as described above, have been met. Amounts of additional royalties due under these license agreements, if any, cannot be reasonably estimated by management.

Certain of the Company’s revenue arrangements provide for the calculation of fees based on a licensee’s actual quarterly sales or actual per unit activity, applied to a contractual royalty rate. Licensees that pay fees on a quarterly basis generally report actual quarterly sales or actual per unit activity information and related quarterly fees due within 30 days to 45 days after the end of the quarter in which such sales or activity takes place. The amount of fees due under these revenue arrangements each quarter cannot be reasonably estimated by management. Consequently, Acacia’s operating subsidiaries recognize revenue from these revenue arrangements on a three-month lag basis, in the quarter following the quarter of sales or per unit activity, provided amounts are fixed or determinable and collectibility is reasonably assured. The lag method described above allows for the receipt of licensee royalty reports prior to the recognition of revenue.

Amounts related to revenue arrangements that do not meet the revenue recognition criteria described above are deferred until the revenue recognition criteria are met.

Acacia assesses the collectibility of fees receivable based on a number of factors, including past transaction history and credit-worthiness of licensees. If it is determined that collection is not reasonably assured, the fee is recognized when collectibility becomes reasonably assured, assuming all other revenue recognition criteria have been met, which is generally upon receipt of cash.

Cost of Revenues

Cost of Revenues.  Cost of revenues include the costs and expenses incurred in connection with Acacia’s patent licensing and enforcement activities, including inventor royalties paid to original patent owners, contingent legal fees paid to external patent counsel, other patent-related legal expenses paid to external patent counsel, licensing and enforcement related research, consulting and other expenses paid to third-parties and the amortization of patent-related acquisition costs. These costs are included under the caption “Cost of revenues” in the accompanying consolidated statements of operations. 

Inventor Royalties and Contingent Legal Expenses

Inventor Royalties and Contingent Legal Expenses. Inventor royalties are expensed in the consolidated statements of operations in the period that the related revenues are recognized. In certain instances, pursuant to the terms of the underlying inventor agreements, costs paid by Acacia’s operating subsidiaries to acquire patents are recoverable from future net revenues. Patent acquisition costs that are recoverable from future net revenues are amortized over the estimated economic useful life of the related patents, or as the prepaid royalties are earned by the inventor, as appropriate, and the related expense is included in amortization expense in the consolidated statements of operations. Any unamortized patent acquisition costs recovered from net revenues are expensed in the period recovered, and included in amortization expense in the consolidated statements of operations.

Contingent legal fees are expensed in the consolidated statements of operations in the period that the related revenues are recognized. In instances where there are no recoveries from potential infringers, no contingent legal fees are paid; however, Acacia’s operating subsidiaries may be liable for certain out of pocket legal costs incurred pursuant to the underlying legal services agreement. Legal fees advanced by contingent law firms that are required to be paid in the event that no license recoveries are obtained are expensed as incurred and included in liabilities in the consolidated balance sheets.

Fair Value Measurements

Fair Value Measurements. U.S. generally accepted accounting principles define fair value as the price that would be received for an asset or the exit price that would be paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants on the measurement date, and also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs, where available. The three-level hierarchy of valuation techniques established to measure fair value, is defined as follows:

●	Level 1 -	Observable Inputs:  Quoted prices in active markets for identical investments;
●	Level 2 -	Pricing Models with Significant Observable Inputs:  Other significant observable inputs, including quoted prices for similar investments, interest rates, credit risk, etc.; and
●	Level 3 -	Unobservable Inputs:  Significant unobservable inputs, including the entity’s own assumptions in determining the fair value of investments.

 Whenever possible, the Company is required to use observable market inputs (Level 1 - quoted market prices) when measuring fair value.

Cash and Cash Equivalents

Cash and Cash Equivalents.  Acacia considers all highly liquid, short-term investments with original maturities of three months or less when purchased to be cash equivalents. For the periods presented, Acacia’s cash equivalents are comprised of investments in AAA rated money market funds that invest in first-tier only securities, which primarily includes: domestic commercial paper, securities issued or guaranteed by the U.S. government or its agencies, U.S. bank obligations, and fully collateralized repurchase agreements. Acacia’s cash equivalents are measured at fair value using quoted prices that represent Level 1 inputs.

Marketable Securities

Investments in Marketable Securities.  Investments in securities with original maturities of greater than three months and less than one year and other investments representing amounts that are available for current operations are classified as short-term investments, unless there are indications that such investments may not be readily sold in the short term. The fair values of these investments approximate their carrying values. At December 31, 2013 and 2012, all of Acacia’s investments were classified as available-for-sale, which are reported at fair value on a recurring basis using significant observable inputs (Level 1) whenever possible, with related unrealized gains and losses in the value of such securities recorded as a separate component of other comprehensive income (loss) in stockholders’ equity until realized. Realized and unrealized gains and losses are recorded based on the specific identification method. Interest on all securities is included in interest income.

Impairment of Marketable Securities. Acacia evaluates its investments in marketable securities for potential impairment, employing a systematic methodology on a quarterly basis that considers available quantitative and qualitative evidence. If the cost or carrying value of an investment exceeds its estimated fair value, the Company evaluates, among other factors, general market conditions, credit quality of instrument issuers, the duration and extent to which the fair value is less than cost, and the Company’s intent and ability to hold, or plans or ability to sell. Fair value is estimated based on publicly available market information or other estimates determined by management. Investments are considered to be impaired when a decline in fair value is estimated to be other-than-temporary. Acacia reviews impairments associated with its investments in marketable securities and determines the classification of any impairment as temporary or other-than-temporary. An impairment is deemed other-than-temporary unless (a) Acacia has the ability and intent to hold an investment for a period of time sufficient for recovery of its carrying amount and (b) positive evidence indicating that the investment’s carrying amount is recoverable within a reasonable period of time outweighs any evidence to the contrary. All available evidence, both positive and negative, is considered to determine whether, based on the weight of such evidence, the carrying amount of the investment is recoverable within a reasonable period of time. For investments classified as available-for-sale, unrealized losses that are other-than-temporary are recognized in the consolidated statements of operations.  

Concentrations of Credit Risk

Concentration of Credit Risks.  Financial instruments that potentially subject Acacia to concentrations of credit risk are cash equivalents, investments and accounts receivable. Acacia places its cash equivalents and investments primarily in highly rated money market funds and investment grade marketable securities. Cash equivalents are also invested in deposits with certain financial institutions and may, at times, exceed federally insured limits. Acacia has not experienced any significant losses on its deposits of cash and cash equivalents.

Two licensees individually accounted for 38% and 16%, respectively, of revenues recognized during the year ended December 31, 2013. Four licensees individually accounted for 21%, 14%, 10% and 10%, respectively, of revenues recognized during the year ended December 31, 2012. Three licensees individually accounted for 26%, 17% and 15%, respectively, of revenues recognized during the year ended December 31, 2011. Two licensees individually represented approximately 60% and 22%, respectively, of accounts receivable at December 31, 2013. Three licensees individually represented approximately 34%, 30% and 25% of accounts receivable at December 31, 2012. For 2013, 2012 and 2011, 24%, 43% and 49%, respectively, of revenues were attributable to licensees domiciled in foreign jurisdictions, based on the jurisdiction of the entity obligated to satisfy payment obligations pursuant to the applicable revenue arrangement. The Company does not have any material foreign operations.

Acacia performs credit evaluations of its licensees with significant receivable balances, if any, and has not experienced any significant credit losses. Accounts receivable are recorded at the executed contract amount and generally do not bear interest. Collateral is not required. An allowance for doubtful accounts may be established to reflect the Company’s best estimate of probable losses inherent in the accounts receivable balance, and is reflected as a contra-asset account on the balance sheet and a charge to operating expenses in the statement of operations for the applicable period. The allowance is determined based on known troubled accounts, historical experience, and other currently available evidence. There was no allowance for doubtful accounts established for the periods presented.

Property and Equipment

Property and Equipment.  Property and equipment are recorded at cost. Major additions and improvements that materially extend useful lives of property and equipment are capitalized. Maintenance and repairs are charged against the results of operations as incurred. When these assets are sold or otherwise disposed of, the asset and related depreciation are relieved, and any gain or loss is included in the consolidated statements of operations for the period of sale or disposal. Depreciation and amortization is computed on a straight-line basis over the following estimated useful lives of the assets:

Furniture and fixtures	3 to 5 years
Computer hardware and software	3 to 5 years
Leasehold improvements	2 to 5 years (Lesser of lease term or useful life of improvement)

Rental payments on operating leases are charged to expense in the consolidated statements of operations on a straight-line basis over the lease term.

Organization Costs

Organization Costs.  Costs of start-up activities, including organization costs, are expensed as incurred.

Patents

Patents.  Patents includes the cost of patents or patent rights (hereinafter, collectively “patents”), acquired from third-parties or acquired in connection with business combinations. Patent acquisition costs are amortized utilizing the straight-line method over their remaining economic useful lives, ranging from one to ten years. Certain patent application and prosecution costs incurred to secure additional patent claims, that based on management’s estimates are deemed to be recoverable, are capitalized and amortized over the remaining estimated economic useful life of the related patent portfolio.

Goodwill

Goodwill. Goodwill is tested for impairment at the reporting unit level (operating segment or one level below an operating segment) on an annual basis (December 31 for Acacia) and between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value. Acacia considers its market capitalization and the carrying value of its assets and liabilities, including goodwill, when performing its goodwill impairment test. When conducting its annual goodwill impairment assessment, the Company initially performs a qualitative evaluation of whether it is more likely than not that goodwill is impaired. If it is determined by a qualitative evaluation that it is more likely than not that goodwill is impaired, the Company then applies a two-step impairment test. The two-step impairment test first compares the fair value of the Company’s reporting unit to its carrying or book value. If the fair value of the reporting unit exceeds its carrying value, goodwill is not impaired and the Company is not required to perform further testing. If the carrying value of the reporting unit exceeds its fair value, the Company determines the implied fair value of the reporting unit’s goodwill and if the carrying value of the reporting unit’s goodwill exceeds its implied fair value, then an impairment loss equal to the difference is recorded in the consolidated statement of operations.

Impairment of Long-Lived Assets

Impairment of Long-lived Assets. Acacia reviews long-lived assets and intangible assets for potential impairment annually (quarterly for patents) and when events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. In the event the sum of the expected undiscounted future cash flows resulting from the use of the asset is less than the carrying amount of the asset, an impairment loss equal to the excess of the asset’s carrying value over its fair value is recorded. If an asset is determined to be impaired, the loss is measured based on quoted market prices in active markets, if available. If quoted market prices are not available, the estimate of fair value is based on various valuation techniques, including a discounted value of estimated future cash flows.

Fair value is generally estimated using the “Income Approach,” focusing on the estimated future net income-producing capability of the patent portfolios over the estimated remaining economic useful life. Estimates of future after-tax cash flows are converted to present value through “discounting,” including an estimated rate of return that accounts for both the time value of money and investment risk factors. Estimated cash inflows are typically based on estimates of reasonable royalty rates for the applicable technology, applied to estimated market share data. Estimated cash outflows are based on existing contractual obligations, such as contingent legal fee and inventor royalty obligations, applied to estimated license fee revenues, in addition to other estimates of out-of-pocket expenses associated with a specific patent portfolio’s licensing and enforcement program. The analysis also contemplates consideration of current information about the patent portfolio including, status and stage of litigation, periodic results of the litigation process, strength of the patent portfolio, technology coverage and other pertinent information that could impact future net cash flows.

Fair Value of Financial Instruments

Fair Value of Financial Instruments.  The carrying value of cash and cash equivalents, investments, accounts receivables, accounts payable and accrued expenses approximates their fair values due to their short-term maturities.

Contingent liabilities [Policy Text Block]

Contingent Liabilities. The Company, from time to time, is involved in certain legal proceedings. Based upon consultation with outside counsel handling its defense in these matters and the Company’s analysis of potential outcomes, if the Company determines that a loss arising from such matters is probable and can be reasonably estimated, an estimate of the contingent liability is recorded in its consolidated financial statements. If only a range of estimated loss can be determined, an amount within the range that, based on estimates, assumptions and judgments, reflects the most likely outcome, is recorded as a contingent liability in the consolidated financial statements. In situations where none of the estimates within the estimated range is a better estimate of probable loss than any other amount, the Company records the low end of the range. Any such accrual would be charged to expense in the appropriate period. Litigation expenses for these types of contingencies are recognized in the period in which the litigation services were provided.

Stock-based Compensation

Stock-Based Compensation. The compensation cost for all stock-based awards is measured at the grant date, based on the fair value of the award, and is recognized as an expense, on a straight-line basis, over the employee’s requisite service period (generally the vesting period of the equity award) which is generally two to four years. The fair value of restricted stock and restricted stock unit awards is determined by the product of the number of shares or units granted and the grant date market price of the underlying common stock. The fair value of each option award is estimated on the date of grant using a Black-Scholes option valuation model. Stock-based compensation expense is recorded only for those awards expected to vest using an estimated forfeiture rate. Refer to Note 11 to these notes to consolidated financial statements for information on stock-based awards granted for the periods presented.

Income Taxes

Income Taxes.  Income taxes are accounted for using an asset and liability approach that requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in Acacia’s consolidated financial statements or consolidated tax returns. A valuation allowance is established to reduce deferred tax assets if all, or some portion, of such assets will more than likely not be realized.

Under U.S. generally accepted accounting principles, a tax position is a position in a previously filed tax return or a position expected to be taken in a future tax filing that is reflected in measuring current or deferred income tax assets and liabilities. Tax positions are recognized only when it is more likely than not (likelihood of greater than 50%), based on technical merits, that the position will be sustained upon examination. Tax positions that meet the more likely than not threshold are measured using a probability weighted approach as the largest amount of tax benefit that is greater than 50% likely of being realized upon settlement.

Acacia recognizes interest and penalties with respect to unrecognized tax benefits in income tax expense. Acacia has identified no uncertain tax position for which it is reasonably possible that the total amount of unrecognized tax benefits will significantly increase or decrease within 12 months.

If a deduction reported on a tax return for an equity-based incentive award exceeds the cumulative compensation cost for those instruments recognized for financial reporting purposes, any resulting realized tax benefit that exceeds the previously calculated deferred tax asset for those instruments is considered an excess tax benefit, and is recognized as additional paid-in capital. If the tax deduction is less than the cumulative book compensation cost, the tax effect of the resulting difference is charged first to APIC, to the extent of the available pool of windfall tax benefits, with any remainder recognized in income tax expense.

Comprehensive Income, Policy [Policy Text Block]

Comprehensive Income (Loss).  Comprehensive income (loss) is the change in equity from transactions and other events and circumstances other than those resulting from investments by owners and distributions to owners.

Segment Reporting

Segment Reporting.  Acacia uses the management approach, which designates the internal organization that is used by management for making operating decisions and assessing performance as the basis of Acacia’s reportable segments. Acacia’s patent licensing and enforcement business constitutes its single reportable segment.

Use of Estimates

Use of Estimates.  The preparation of financial statements in conformity with generally accepted accounting principles in the United States of America requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates. Acacia believes that, of the significant accounting policies described herein, the accounting policies associated with revenue recognition, stock-based compensation expense, impairment of marketable securities and intangible assets, the determination of the economic useful life of amortizable intangible assets, income taxes and valuation allowances against net deferred tax assets and the application of the acquisition method of accounting for business combinations, require its most difficult, subjective or complex judgments.

Earnings Per Share

Earnings (Loss) Per Share.  The Company computes net income (loss) attributable to common stockholders using the two-class method required for capital structures that include participating securities. Under the two-class method, securities that participate in non-forfeitable dividends, such as the Company’s outstanding unvested restricted stock, are considered “participating securities.”

In applying the two-class method, (i) basic net income (loss) per share is computed by dividing net income (loss) (less any dividends paid on participating securities) by the weighted average number of shares of common stock and participating securities outstanding for the period and (ii) diluted earnings per share may include the additional effect of other securities, if dilutive, in which case the dilutive effect of such securities is calculated by applying the two-class method and the treasury stock method to the assumed exercise or vesting of potentially dilutive common shares. The method yielding the more dilutive result is ultimately reported for the applicable period. Potentially dilutive common stock equivalents primarily consist of employee stock options, and restricted stock units for calculations utilizing the two-class method, and also include unvested restricted stock, when utilizing the treasury method.

The following table presents the weighted-average number of common shares outstanding used in the calculation of basic and diluted income per share:

	2013			2012			2011
Numerator (in thousands):
Basic
Net income (loss)	$	(56,434	)	$	59,453		$	21,106
Undistributed earnings allocated to participating securities	—			(1,889		)	(841		)
Total dividends paid	(18,633		)	—			—
Dividends attributable to common stockholders	18,122			—			—
Net income (loss) attributable to common stockholders – basic	$	(56,945	)	$	57,564		$	20,265
Diluted
Net income (loss)	$	(56,434	)	$	59,453		$	21,106
Undistributed earnings allocated to participating securities	—			(1,876		)	(833		)
Total dividends paid	(18,633		)	—			—
Dividends attributable to common stockholders	18,122			—			—
Net income (loss) attributable to common stockholders – diluted	$	(56,945	)	$	57,577		$	20,273
Denominator:
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders – basic	48,155,832			47,251,061			39,743,433
Effect of potentially dilutive securities:
Common stock options and restricted stock units	—			333,059			407,167
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders – diluted	48,155,832			47,584,120			40,150,600
Basic net income (loss) per common share	$	(1.18	)	$	1.22		$	0.51
Diluted net income (loss) per common share	$	(1.18	)	$	1.21		$	0.50
Anti-dilutive equity-based incentive awards excluded from the computation of diluted income (loss) per share	27,760			30,812			7,760

Revision of Prior Period Earnings (Loss) Per Share - Two-Class Method. In connection with the preparation of the Company’s Quarterly Report on Form 10-Q as of and for the three and nine months ended September 30, 2013, the Company determined that its basic and diluted net income (loss) per share calculations should have been prepared using the “two-class method.” Pursuant to guidance set forth in Staff Accounting Bulletin (“SAB”) No. 99, “Materiality,” the Company concluded that the errors were not material to any of its prior period financial statements. Although the errors were immaterial to prior periods, the prior period financial statements presented herein were revised, in accordance with SAB No. 108, “Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements.” The impact of the revision for the comparable prior period earnings (loss) per share calculations using the two-class method were as follows:

	2012		2011
Numerator:
Net income attributable to common stockholders – basic and diluted - As Reported	$	59,453	$	21,106
Net income attributable to common stockholders – basic - As Adjusted	$	57,564	$	20,265
Net income attributable to common stockholders – diluted - As Adjusted	$	57,577	$	20,273
Denominator:
Weighted-average shares used in computing net income per share attributable to common stockholders – basic - As Reported	47,251,061		39,743,433
Weighted-average shares used in computing net income per share attributable to common stockholders – basic - As Adjusted	47,251,061		39,743,433
Weighted-average shares used in computing net income per share attributable to common stockholders – diluted - As Reported	48,060,647		41,258,297
Weighted-average shares used in computing net income per share attributable to common stockholders – diluted - As Adjusted	47,584,120		40,150,600
Basic net income per common share - As Reported	$	1.26	$	0.53
Basic net income per common share - As Adjusted	$	1.22	$	0.51
Diluted net income per common share - As Reported	$	1.24	$	0.51
Diluted net income per common share - As Adjusted	$	1.21	$	0.50

Recently Adopted Accounting Policies

Recently Adopted Accounting Pronouncements - Adopted Effective January 1, 2013. In February 2013, the Financial Accounting Standards Board (“FASB”) issued a new accounting standard requiring an entity to report the effect of significant reclassifications out of accumulated other comprehensive income on the respective line items in net income if the amount being reclassified is required under U.S. Generally Accepted Accounting Principles (“U.S. GAAP”) to be reclassified in its entirety to net income. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety to net income in the same reporting period, an entity is required to cross-reference other disclosures required under U.S. GAAP that provide additional detail about those amounts. This pronouncement is effective prospectively for reporting periods beginning after December 15, 2012. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements and related disclosures.

In December 2012, the FASB issued a new accounting standard that will require the Company to disclose information about offsetting and related arrangements to enable users of its financial statements to understand the effect of those arrangements on its financial position. The new guidance is effective for the Company’s interim period ending March 31, 2013. The disclosures required are to be applied retrospectively for all comparative periods presented. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements and related disclosures.

In July 2013, the FASB issued an accounting update which provides guidance on financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward or a tax credit carryforward exists in the same taxing jurisdiction. Per this guidance, an entity must present the unrecognized tax benefit as a reduction to a deferred tax asset, except when the carryforward is not available as of the reporting date under the governing tax law to settle taxes or the entity does not intend to use the deferred tax asset for this purpose. This amendment does not impact the recognition or measurement of uncertain tax positions or the disclosure reconciliation of gross unrecognized tax benefits. The new accounting standards update becomes effective for the Company on January 1, 2014 and it should be applied prospectively to unrecognized tax benefits that exist at the effective date with retrospective application permitted. Early adoption of the update is permitted and an entity may choose to apply this amendment retrospectively to each reporting period presented. The adoption of this accounting update did not have a material impact on the Company’s consolidated financial statements.

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Fair Value Measurements and Auction Rate Securities (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Fair Value Measurements and Auction Rate Securities [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	$ 2,074,000
Auction rate securities, par value	2,425,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	$ 118,000

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Summary of Significant Accounting Policies Impact of revision (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]
Net Income (Loss) Attributable to Acacia Research Corporation	$ (33,333,000)	$ (15,711,000)	$ (12,503,000)	$ 5,113,000	$ 9,823,000	$ (6,619,000)	$ 6,321,000	$ 49,928,000	$ (56,434,000)	$ 59,453,000	$ 21,106,000
Net Income (Loss) Available to Common Stockholders, Basic									(56,945,000)	57,564,000	20,265,000
Net Income (Loss) Available to Common Stockholders, Diluted									(56,945,000)	57,577,000	20,273,000
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders – basic - As Reported										47,251,061	39,743,433
Weighted-average number of shares outstanding, basic - As Adjusted(1)	48,415,684	48,330,149	48,008,998	47,859,774	48,335,865	48,332,878	47,944,193	44,367,499	48,155,832	47,251,061	39,743,433
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders – diluted - As Reported										48,060,647	41,258,297
Weighted-average number of shares outstanding, diluted - As Adjusted(1)	48,415,684	48,330,149	48,008,998	48,104,242	48,607,141	48,332,878	48,294,782	44,764,064	48,155,832	47,584,120	40,150,600
Basic net income (loss) per common share, As Reported										1.26	0.53
Basic income (loss) per common share	$ (0.69)	$ (0.33)	$ (0.26)	$ 0.10	$ 0.20	$ (0.14)	$ 0.13	$ 1.08	$ (1.18)	$ 1.22	$ 0.51
Diluted net income (loss) per common share - As Reported										$ 1.24	$ 0.51
Diluted income (loss) per common share	$ (0.69)	$ (0.33)	$ (0.26)	$ 0.10	$ 0.20	$ (0.14)	$ 0.13	$ 1.08	$ (1.18)	$ 1.21	$ 0.50

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Description of Business (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 12, 2012 ADAPTIX, Inc. [Member]
Description of Business [Line Items]
Payments to acquire businesses, gross	$ 0	$ 150,000	$ 0	$ 150,000

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Acquisition Purchase Price Allocation (Details) (USD $) In Thousands, unless otherwise specified			0 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Jan. 12, 2012 ADAPTIX, Inc. [Member]	Dec. 31, 2013 ADAPTIX, Inc. [Member]
Business Acquisition [Line Items]
Fair value of net tangible assets acquired			$ 10,000
Intangible assets acquired - patents			150,000
Goodwill	30,149	30,149	30,149
Net deferred income tax liability			(30,149)
Total			160,000
Patents, useful life			10 years	10 years
Patents, future annual amortization expense per year			$ 15,000

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Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$ 1,312,000	$ 898,000	$ 915,000
Partners' capital, authorized	250,000,000
Cash and other assets, IP Fund	2,927,000	2,542,000
Patents, net of accumulated amortization, IP Fund	1,373,000	7,144,000
Investments, IP Fund	11,120,000	11,617,000
Total assets, IP Fund	15,420,000	21,303,000
Accrued expenses and contributions, IP Fund	2,437,000	5,016,000
Accrued patent acquisition costs, IP Fund	0	500,000
Total liabilities, IP Fund	2,437,000	5,516,000
Net assets, IP Fund	$ 12,983,000	$ 15,787,000

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Income Taxes Gross Unrecognized Tax Benefit (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 2,127	$ 2,127	$ 85
Additions based on tax positions related to the current year	0
Additions for tax positions related to prior years	772
Additions resulting from the acquisition of ADAPTIX	1,270
Reductions	$ 0

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Goodwill and Other Identifiable Intangible Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Patents [Line Items]
Patents, weighted average useful life	7 years
Payments to acquire intangible assets	$ 25,061,000	$ 178,260,000	$ 14,680,000
Accrued patent acquisition related payments	4,000,000
Accelerated amortization expense	592,000	10,574,000	3,111,000
Accelerated amortization expense (termination)	1,747,000	3,034,000	1,103,000
Impairment of Intangible Assets (Excluding Goodwill)	$ 4,619,000
Minimum [Member]
Patents [Line Items]
Patents, useful life	1 year
Acquired Finite Lived Intangible Asset, Useful Life	3 years
Maximum [Member]
Patents [Line Items]
Patents, useful life	10 years
Acquired Finite Lived Intangible Asset, Useful Life	10 years
Patents [Member] | Minimum [Member]
Patents [Line Items]
Patents, useful life	1 year
Patents [Member] | Maximum [Member]
Patents [Line Items]
Patents, useful life	10 years

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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income including noncontrolling interests in operating subsidiaries	$ (58,842)	$ 59,289	$ 21,645
Adjustments to reconcile net income (loss) including noncontrolling interests in operating subsidiaries to net cash provided by (used in) operating activities:
Depreciation and amortization	53,894	39,168	9,850
Non-cash stock compensation	27,894	25,657	13,579
Excess tax benefits from stock-based compensation	1,398	(13,210)	(583)
Change in valuation allowance	2,189	(10,651)	0
Other	12	777	(15)
Changes in assets and liabilities:
Accounts receivable	3,502	(6,928)	5,072
Prepaid expenses and other assets	(5,300)	(1,294)	1,075
Accounts payable and accrued expenses / costs	1,076	16,249	(781)
Royalties and contingent legal fees payable	(2,061)	(11,000)	10,748
Deferred income tax	(27,271)	6,546	0
Net cash provided by (used in) operating activities	(3,509)	104,603	60,590
Cash flows from investing activities:
Purchase of property and equipment	(675)	(268)	(190)
Purchase of available-for-sale investments	(279,693)	(402,500)	(8,427)
Sale of available-for-sale investments	239,370	322,236	60
Purchase of ADAPTIX, Inc., net of cash acquired	0	(150,000)	0
Patent acquisition costs	(25,061)	(178,260)	(14,680)
Net cash used in investing activities	(66,059)	(408,792)	(23,237)
Cash flows from financing activities:
Proceeds from sale of common stock, net of issuance costs	0	218,961	175,229
Repurchases of common stock	(7,926)	(26,732)	0
Dividends paid to shareholders	(18,633)	0	0
Distributions to noncontrolling interests in operating subsidiary	0	(312)	(2,897)
Contributions from noncontrolling interests in operating subsidiary, net of issuance costs	1,920	5,793	1,539
Proceeds from the exercise of stock options	486	340	411
Excess tax benefits from stock-based compensation	(1,398)	13,210	583
Net cash provided by (used in) financing activities	(25,551)	211,260	174,865
Increase in cash and cash equivalents	(95,119)	(92,929)	212,218
Cash and cash equivalents, beginning	221,804	314,733	102,515
Cash and cash equivalents, ending	126,685	221,804	314,733
Patent acquisition costs included in accrued expenses	$ 4,000	$ 0	$ 900

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Income Taxes Valuation allowance (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Capital loss carryforwards, valuation allowance	$ 1,562	$ 2,935
Operating Loss Carryforwards, Valuation Allowance	1,281	2,046
Foreign tax credits, valuation allowance	4,405	0
Unrealized losses on short-term investments and other deferred tax assets, valuation allowance	337	415
Valuation Allowances and Reserves, Balance	$ 7,585	$ 5,396

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Short-term Investments (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Proceeds from Sale of Available-for-sale Securities	$ 239,370,000	$ 322,236,000	$ 60,000
Available-for-sale securities, amortized cost	130,971,000	90,648,000
Available-for-sale securities, gross unrealized gains	21,000	20,000
Available-for-sale securities, gross unrealized losses	(975,000)	(1,193,000)
Available-for-sale securities, fair value	130,017,000	89,475,000
Available-for-sale Securities, Gross Realized Gains	1,174,000	31,000
Available-for-sale Securities, Gross Realized Losses	981,000	555,000
Proceeds from Sale and Maturity of Marketable Securities		319,811,000	0
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	130,971,000	87,394,000
Available-for-sale securities, gross unrealized gains	21,000	20,000
Available-for-sale securities, gross unrealized losses	(975,000)	(411,000)
Available-for-sale securities, fair value	130,017,000	87,003,000
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost		3,254,000
Available-for-sale securities, gross unrealized gains		0
Available-for-sale securities, gross unrealized losses		(782,000)
Available-for-sale securities, fair value		$ 2,472,000
Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment Maturity Date	Dec. 31, 2014	Dec. 31, 2013
Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment Maturity Date	Dec. 31, 2015	Dec. 31, 2014

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Accounts Payable and Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2013

Accounts Payable and Accrued Liabilities, Current [Abstract]

Accounts Payable and Accrued Expenses / Costs

Accounts payable and accrued expenses consist of the following at December 31, 2013 and 2012 (in thousands):

	2013		2012
Accounts payable	$	128	$	642
Payroll and other employee benefits	1,039		1,815
Accrued vacation	813		703
Accrued legal expenses - patent	5,900		3,990
Accrued consulting and other professional fees	2,948		1,510
Accrued distribution to noncontrolling interests	504		504
Other accrued liabilities	223		71
	$	11,555	$	9,235

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Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2013

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and equipment consists of the following at December 31, 2013 and 2012 (in thousands):

	2013			2012
Furniture and fixtures	$	783		$	472
Computer hardware and software	687			586
Leasehold improvements	306			173
	1,776			1,231
Less:  accumulated depreciation and amortization	(1,010		)	(892		)
	$	766		$	339

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Stockholders' Equity Repurchases of Common Stock (Details) (USD $)	0 Months Ended		1 Months Ended		12 Months Ended
	Dec. 11, 2013	Nov. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Stockholders' Equity Note [Abstract]
Treasury stock, shares acquired	600,000	256,262		873,146	600,000	1,129,408
Treasury stock acquired, average price paid per share	$ 13.18	$ 21.58	$ 24.26		$ 23.65
Stock repurchase program, remaining authorized repurchase amount	$ 62,074,000,000	$ 0	$ 0

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Property and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 236,000	$ 149,000	$ 105,000

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Goodwill and Other Identifiable Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2013

Patents [Abstract]

Patent costs and accumulated amortization related to patent sales and disposals [Table Text Block]

For the years ended December 31, 2013, 2012 and 2011, capitalized patent costs and accumulated amortization, and sales proceeds and other costs, related to patent-related sales and disposals are as follows (in thousands):

	2013		2012		2011
Capitalized patent costs	$	3,500	$	5,500	$	4,612
Accumulated amortization	1,753		2,466		3,509
Sales proceeds	1,000		2,792		11,000
Other costs	—		—		4,717

Patents

The gross carrying amounts and accumulated amortization related to acquired intangible assets as of December 31, 2013 and 2012 are as follows (in thousands): 

	2013			2012
Gross carrying amount - patents	$	400,755		$	383,379
Accumulated amortization - patents	(112,323		)	(69,850		)
Patents, net	$	288,432		$	313,529

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Acquisition (Tables)

12 Months Ended

Dec. 31, 2013

Business Combinations [Abstract]

Schedule of Purchase Price Allocation

The total consideration paid by ARG in connection with the Merger was approximately $160 million, in cash. Based on the total purchase consideration and the estimate of the assets acquired and the liabilities assumed by ARG as of the Acquisition Date, the purchase price allocation was as follows ($ amounts in thousands):

				Amortization Period	Annual Amortization
Assets Acquired and Liabilities Assumed:
Fair value of net tangible assets acquired	$	10,000
Intangible assets acquired - patents	150,000			10 years	$	15,000
Goodwill	30,149
Net deferred income tax liability	(30,149		)
Total	$	160,000

Deferred Tax Liability, Acquisition

The estimated net deferred tax liability was determined as follows ($ amounts in thousands):

	Book Basis		Tax Basis		Difference
Intangible assets acquired - patents	$	150,000	$	—	$	(150,000	)
Estimated acquired deferred tax assets (including net operating loss carryforwards) - ADAPTIX	—		63,860		63,860
Net deferred tax liability - pretax					(86,140		)
Estimated tax rate					35		%
Estimated net deferred tax liability					$	(30,149	)

Business Acquisition, Pro Forma Information

The unaudited pro forma combined results are presented in thousands, except share and per share information.

	2012			2011
Revenues	$	250,727		$	172,256
Total operating costs and expenses	170,953			159,674
Operating income	79,774			12,582
Interest and investment income	937			96
Income from operations before provision for income taxes	80,711			12,678
Provision for income taxes	(22,060		)	(8,708		)
Net income including noncontrolling interests in operating subsidiaries	58,651			3,970
Net loss (income) attributable to noncontrolling interests in operating subsidiaries	164			(539		)
Net income attributable to Acacia Research Corporation	$	58,815		$	3,431

	2012		2011
Pro forma income per common share attributable to Acacia Research Corporation:
Basic earnings per share	$	1.24	$	0.09
Diluted earnings per share	$	1.22	$	0.08
Weighted average number of shares outstanding, basic	47,251,061		39,743,433
Weighted average number of shares outstanding, diluted	48,060,647		41,258,297

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Consolidated Statements of Stockholders' Equity Parentheticals (Additional Paid-in Capital [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Additional Paid-in Capital [Member]
Issuance costs	$ 0	$ 6,039	$ 5,896

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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2013

Stockholders' Equity Note [Abstract]

Schedule of Treasury Stock by Class

Following are our monthly stock repurchases for the periods presented, all of which were purchased as part of publicly announced plans or programs:

	Total Number of Shares Purchased	Average Price paid per Share		Approximate Dollar Value of Shares that May Yet be Purchased under the Program		Plan Expiration
November 16, 2012 - November 30, 2012	256,262	$	21.58	$	—	August 15, 2013
December 1, 2012 - December 31, 2012	873,146	$	24.26	$	—	August 15, 2013
Totals for 2012	1,129,408	$	23.65
December 4, 2013 - December 11, 2013	600,000	$	13.18	$	62,074,000	May 14, 2014
Totals for 2013	600,000

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Summary of Significant Accounting Policies Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2013
Furniture and Fixtures [Member] | Minimum [Member]
Property and Equipment [Line Items]
Estimated useful lives, years	3
Furniture and Fixtures [Member] | Maximum [Member]
Property and Equipment [Line Items]
Estimated useful lives, years	5
Computer Hardware and Software [Member] | Minimum [Member]
Property and Equipment [Line Items]
Estimated useful lives, years	3
Computer Hardware and Software [Member] | Maximum [Member]
Property and Equipment [Line Items]
Estimated useful lives, years	5
Leasehold Improvements [Member] | Minimum [Member]
Property and Equipment [Line Items]
Estimated useful lives, years	2
Leasehold Improvements [Member] | Maximum [Member]
Property and Equipment [Line Items]
Estimated useful lives, years	5

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Acquisition Acquisition Deferred Tax (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 12, 2012 ADAPTIX, Inc. [Member]
Business Acquisition [Line Items]
Book basis of intangible assets acquired - patents				$ 150,000,000
Tax basis of intangible assets acquired - patents				0
Change from book and tax basis of intangible assets acquired - patents				(150,000,000)
Estimated net operating loss carryforwards - ADAPTIX				0
Tax basis of estimated net operating loss carryforwards - ADAPTIX				63,860,000
Change from book and tax basis of estimated net operating loss carryforwards - ADAPTIX				63,860,000
Net deferred tax liability - pretax				(86,140,000)
Estimated tax rate	(35.00%)	35.00%	35.00%	35.00%
Deferred tax asset, acquisition				$ (30,149,000)

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 126,685	$ 221,804
Short-term investments	130,017	89,475
Accounts receivable	6,341	9,843
Deferred income tax	3,139	1,014
Prepaid expenses and other current assets	7,546	2,427
Total current assets	273,728	324,563
Property and equipment, net of accumulated depreciation and amortization	766	339
Patents, net of accumulated amortization	288,432	313,529
Goodwill	30,149	30,149
Other assets	318	137
Total assets	593,393	668,717
Current liabilities:
Accounts payable and accrued expenses	11,555	9,235
Accrued patent acquisition costs	4,000	250
Royalties and contingent legal fees payable	10,447	12,508
Total current liabilities	26,002	21,993
Deferred income taxes	4,874	27,831
Other liabilities	319	415
Total liabilities	31,195	50,239
Commitments and contingencies (Note 12)
Stockholders' equity:
Preferred stock, par value $0.001 per share; 10,000,000 shares authorized; no shares issued or outstanding	0	0
Common stock, par value $0.001 per share; 100,000,000 shares authorized; 49,385,057 shares issued and outstanding as of December 31, 2013 and 49,160,844 shares issued and outstanding as of December 31, 2012	49	49
Treasury stock, at cost, 1,729,408 shares as of December 31, 2013 and 1,129,408 shares as of December 31, 2012	(34,640)	(26,731)
Additional paid-in capital	653,314	644,982
Accumulated comprehensive loss	(947)	(1,166)
Accumulated deficit	(62,066)	(5,632)
Total Acacia Research Corporation stockholders’ equity	555,710	611,502
Noncontrolling interests in operating subsidiaries	6,488	6,976
Total stockholders’ equity	562,198	618,478
Total liabilities and stockholders' equity	$ 593,393	$ 668,717

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Property and Equipment Summary of Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property and Equipment [Line Items]
Furniture and fixtures	$ 783	$ 472
Computer hardware and software	687	586
Leasehold improvements	306	173
Property and equipment, gross	1,776	1,231
Less: accumulated depreciation and amortization	(1,010)	(892)
Property and equipment, net	$ 766	$ 339

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Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net income (loss) attributable to Acacia Research Corporation	$ (56,434)	$ 59,453	$ 21,106
Other comprehensive income (loss):
Unrealized loss on short-term investments	26	657	(1,830)
Unrealized gain on foreign currency translation	0	7	0
Add: reclassification adjustment for losses included in net income	193	277	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(56,215)	60,394	19,276
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest	0	0	0
Comprehensive income	$ (56,215)	$ 60,394	$ 19,276

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Income Taxes Deferred Taxes (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Net operating loss and capital loss carryforwards and credits	$ 34,679	$ 15,668
Stock compensation	3,052	1,140
Basis of investments in affiliates	867	415
Accrued liabilities and other	387	250
Unrealized loss on short-term investments	337	415
State taxes	18	212
Total deferred tax assets	39,340	18,100
Deferred tax liabilities:
Fixed assets and intangibles	(33,378)	(39,457)
Other	(112)	(60)
Net deferred tax liabilities	5,850	(21,417)
Less: valuation allowance	(7,585)	(5,396)
Net deferred taxes	$ (1,735)	$ (26,813)

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

Net assets of IP Fund [Table Text Block]

At December 31, 2013 and 2012, the Acacia IP Fund net assets were primarily comprised of the following (in thousands):

	December 31, 2013		December 31, 2012
Cash and other assets	$	2,927	$	2,542
Patents, net of accumulated amortization	1,373		7,144
Investments - noncurrent	11,120		11,617
Total assets	$	15,420	$	21,303
Accrued expenses and contributions	$	2,437	$	5,016
Accrued patent acquisition costs	—		500
Total liabilities	2,437		5,516
Net assets	$	12,983	$	15,787

Schedule of Future Minimum Rental Payments for Operating Leases

Minimum annual rental commitments for operating leases of continuing operations having initial or remaining noncancellable lease terms in excess of one year are as follows (in thousands):

Year
2014	$	1,442
2015	1,553
2016	918
2017	318
2018	324
Thereafter	498
Total minimum lease payments	$	5,053

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Stock-Based Incentive Plans Nonvested Restriced Stock (Details) (Restricted Stock [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Nonvested at December 31, 2012	1,353,000
Granted	823,000
Vested	(813,000)
Canceled	(126,000)
Nonvested at December 31, 2013	1,237,000	1,353,000
Nonvested, weighted average grant date fair value at December 31, 2011	$ 30.17
Granted, weighted average grant date fair value	$ 24.31	$ 32.17	$ 29.24
Vested, weighted average grant date fair value	$ 27.45
Canceled, weighted average grant date fair value	$ 28.48
Nonvested, weighted average grant date fair value at December 31, 2012	$ 28.23	$ 30.17

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Retirement Savings Plan and Executive Severance Policy

12 Months Ended

Dec. 31, 2013

RETIREMENT SAVINGS PLAN AND EXECUTIVE SEVERANCE POLICY [Abstract]

Retirement Savings Plan and Executive Severance Policy

RETIREMENT SAVINGS PLAN AND EXECUTIVE SEVERANCE POLICY

Retirement Savings Plan.  Acacia has an employee savings and retirement plan under section 401(k) of the Code (the “Plan”). The Plan is a defined contribution plan in which eligible employees may elect to have a percentage of their compensation contributed to the Plan, subject to certain guidelines issued by the Internal Revenue Service. Acacia may contribute to the Plan at the discretion of the board of directors. There were no contributions made by Acacia during the periods presented.

Executive Severance Policy.  Under Acacia’s Amended Executive Severance Policy, full-time employees with the title of Senior Vice President and higher (“Officer”) are entitled to receive certain benefits upon termination of employment. If employment of an Officer is terminated for other than cause or other than on account of death or disability, Acacia will (i) promptly pay to the Officer a lump sum amount equal to the aggregate of (a) accrued obligations (i.e., the Officer’s annual base salary through the date of termination to the extent not theretofore paid and any compensation previously deferred by the Officer (together with any accrued interest or earnings thereon) and any accrued vacation pay, and reimbursable expenses, in each case to the extent not theretofore paid) and (b) three (3) months of the Officer’s base salary for each full year that the Officer was employed by the Company (the “Severance Period”), up to a maximum of twelve (12) months of the Officer’s base salary, and (ii) provide to the Officer, Acacia paid COBRA coverage for the medical and dental benefits selected by the Officer in the year in which the termination occurs, for the duration of the Severance Period.

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Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2012

QUARTERLY FINANCIAL DATA (unaudited) [Abstract]

Quarterly Financial Data

The following table sets forth unaudited consolidated statements of operations data for the eight quarters in the period ended December 31, 2013. This information has been derived from Acacia’s unaudited condensed consolidated financial statements that have been prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, include all adjustments, consisting of normal recurring adjustments, necessary for a fair statement of the information when read in conjunction with the audited consolidated financial statements and related notes thereto. Acacia’s quarterly results have been, and may in the future be, subject to significant fluctuations. As a result, Acacia believes that results of operations for interim periods should not be relied upon as any indication of the results to be expected in any future periods.

	Quarter Ended
	Mar. 31,			Jun. 30,			Sept. 30,			Dec. 31,			Mar. 31,			Jun. 30,			Sept. 30,			Dec. 31,
	2013			2013			2013			2013			2012			2012			2012			2012
	(Unaudited, in thousands, except share and per share information)
Revenues	$	76,861		$	23,110		$	15,520		$	15,065		$	99,040		$	50,484		$	34,939		$	66,264
Operating costs and expenses:
Cost of revenues:
Inventor royalties	18,481			5,610			2,353			3,280			7,594			9,573			5,032			3,829
Contingent legal fees	15,032			4,024			2,547			3,181			3,748			6,607			8,833			5,463
Litigation and licensing expenses - patents	9,648			9,918			10,870			8,899			3,381			5,268			5,973			6,969
Amortization of patents	11,730			12,578			12,615			16,735			5,126			5,393			10,412			18,088
Marketing, general and administrative expenses (including non-cash stock compensation expense)	13,844			13,175			18,222			13,988			13,731			11,903			11,914			16,535
Research, consulting and other expenses - business development	1,031			735			743			742			1,116			1,967			1,139			721
Other	—			—			3,506			—			—			—			—			—
Total operating costs and expenses	69,766			46,040			50,856			46,825			34,696			40,711			43,303			51,605
Operating income (loss)	7,095			(22,930		)	(35,336		)	(31,760		)	64,344			9,773			(8,364		)	14,659
Total other income (expense)	1,290			400			280			161			56			102			(41		)	820
Income (loss) before (provision for) benefit from income taxes	8,385			(22,530		)	(35,056		)	(31,599		)	64,400			9,875			(8,405		)	15,479
Benefit from (provision for) income taxes	(3,272		)	9,050			19,570			(3,390		)	(14,747		)	(3,494		)	1,938			(5,757		)
Net income (loss) including noncontrolling interests	5,113			(13,480		)	(15,486		)	(34,989		)	49,653			6,381			(6,467		)	9,722
Net (income) loss attributable to noncontrolling interests	—			977			(225		)	1,656			275			(60		)	(152		)	101
Net income (loss) attributable to Acacia Research Corporation	$	5,113		$	(12,503	)	$	(15,711	)	$	(33,333	)	$	49,928		$	6,321		$	(6,619	)	$	9,823
Net income (loss) per common share attributable to Acacia Research Corporation:
Basic income (loss) per share - As Adjusted(1)	$	0.10		$	(0.26	)	$	(0.33	)	$	(0.69	)	$	1.08		$	0.13		$	(0.14	)	$	0.20
Diluted income (loss) per share - As Adjusted(1)	$	0.10		$	(0.26	)	$	(0.33	)	$	(0.69	)	$	1.08		$	0.13		$	(0.14	)	$	0.20
Weighted-average number of shares outstanding, basic - As Adjusted(1)	47,859,774			48,008,998			48,330,149			48,415,684			44,367,499			47,944,193			48,332,878			48,335,865
Weighted-average number of shares outstanding, diluted - As Adjusted(1)	48,104,242			48,008,998			48,330,149			48,415,684			44,764,064			48,294,782			48,332,878			48,607,141

	Quarter Ended
	Mar. 31,		Jun. 30,			Sept. 30,	Dec. 31,	Mar. 31,		Jun. 30,		Sept. 30,			Dec. 31,
	2013		2013			2013	2013	2012		2012		2012			2012
	(Unaudited, In thousands, except share and per share information)
Basic income (loss) per share - As Reported(1)	$	0.11	$	(0.26	)	N/A	N/A	$	1.13	$	0.13	$	(0.14	)	$	0.20
Diluted income (loss) per share - As Reported(1)	$	0.11	$	(0.26	)	N/A	N/A	$	1.09	$	0.13	$	(0.14	)	$	0.20
Weighted-average number of shares outstanding, basic - As Reported(1)	47,859,774		48,008,998			N/A	N/A	44,367,499		47,944,193		48,332,878			48,335,865
Weighted-average number of shares outstanding, diluted - As Reported(1)	48,354,444		48,008,998			N/A	N/A	45,771,228		48,938,766		48,332,878			48,797,304

_______________________

(1) - Revision of Prior Period Earnings (Loss) Per Share - Two-Class Method. In connection with the preparation of the Company’s Quarterly Report on Form 10-Q as of and for the three months ended September 30, 2013, the Company determined that its basic and diluted net income (loss) per share calculations should have been prepared using the “two-class method.” Under the two-class method, securities that participate in dividends are considered “participating securities.” The Company’s unvested restricted shares outstanding are considered “participating securities” because they include non-forfeitable rights to dividends.

Pursuant to guidance set forth in Staff Accounting Bulletin (“SAB”) No. 99, “Materiality,” the Company concluded that the errors were not material to any of its prior period financial statements. Although the errors were immaterial to prior periods, the prior period financial statements presented herein were revised, in accordance with SAB No. 108, “Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements.”

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Quarterly Financial Data

12 Months Ended

Dec. 31, 2012

Quarterly Financial Data [Abstract]

Quarterly Financial Data

QUARTERLY FINANCIAL DATA (unaudited)

The following table sets forth unaudited consolidated statements of operations data for the eight quarters in the period ended December 31, 2013. This information has been derived from Acacia’s unaudited condensed consolidated financial statements that have been prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, include all adjustments, consisting of normal recurring adjustments, necessary for a fair statement of the information when read in conjunction with the audited consolidated financial statements and related notes thereto. Acacia’s quarterly results have been, and may in the future be, subject to significant fluctuations. As a result, Acacia believes that results of operations for interim periods should not be relied upon as any indication of the results to be expected in any future periods.

	Quarter Ended
	Mar. 31,			Jun. 30,			Sept. 30,			Dec. 31,			Mar. 31,			Jun. 30,			Sept. 30,			Dec. 31,
	2013			2013			2013			2013			2012			2012			2012			2012
	(Unaudited, in thousands, except share and per share information)
Revenues	$	76,861		$	23,110		$	15,520		$	15,065		$	99,040		$	50,484		$	34,939		$	66,264
Operating costs and expenses:
Cost of revenues:
Inventor royalties	18,481			5,610			2,353			3,280			7,594			9,573			5,032			3,829
Contingent legal fees	15,032			4,024			2,547			3,181			3,748			6,607			8,833			5,463
Litigation and licensing expenses - patents	9,648			9,918			10,870			8,899			3,381			5,268			5,973			6,969
Amortization of patents	11,730			12,578			12,615			16,735			5,126			5,393			10,412			18,088
Marketing, general and administrative expenses (including non-cash stock compensation expense)	13,844			13,175			18,222			13,988			13,731			11,903			11,914			16,535
Research, consulting and other expenses - business development	1,031			735			743			742			1,116			1,967			1,139			721
Other	—			—			3,506			—			—			—			—			—
Total operating costs and expenses	69,766			46,040			50,856			46,825			34,696			40,711			43,303			51,605
Operating income (loss)	7,095			(22,930		)	(35,336		)	(31,760		)	64,344			9,773			(8,364		)	14,659
Total other income (expense)	1,290			400			280			161			56			102			(41		)	820
Income (loss) before (provision for) benefit from income taxes	8,385			(22,530		)	(35,056		)	(31,599		)	64,400			9,875			(8,405		)	15,479
Benefit from (provision for) income taxes	(3,272		)	9,050			19,570			(3,390		)	(14,747		)	(3,494		)	1,938			(5,757		)
Net income (loss) including noncontrolling interests	5,113			(13,480		)	(15,486		)	(34,989		)	49,653			6,381			(6,467		)	9,722
Net (income) loss attributable to noncontrolling interests	—			977			(225		)	1,656			275			(60		)	(152		)	101
Net income (loss) attributable to Acacia Research Corporation	$	5,113		$	(12,503	)	$	(15,711	)	$	(33,333	)	$	49,928		$	6,321		$	(6,619	)	$	9,823
Net income (loss) per common share attributable to Acacia Research Corporation:
Basic income (loss) per share - As Adjusted(1)	$	0.10		$	(0.26	)	$	(0.33	)	$	(0.69	)	$	1.08		$	0.13		$	(0.14	)	$	0.20
Diluted income (loss) per share - As Adjusted(1)	$	0.10		$	(0.26	)	$	(0.33	)	$	(0.69	)	$	1.08		$	0.13		$	(0.14	)	$	0.20
Weighted-average number of shares outstanding, basic - As Adjusted(1)	47,859,774			48,008,998			48,330,149			48,415,684			44,367,499			47,944,193			48,332,878			48,335,865
Weighted-average number of shares outstanding, diluted - As Adjusted(1)	48,104,242			48,008,998			48,330,149			48,415,684			44,764,064			48,294,782			48,332,878			48,607,141

	Quarter Ended
	Mar. 31,		Jun. 30,			Sept. 30,	Dec. 31,	Mar. 31,		Jun. 30,		Sept. 30,			Dec. 31,
	2013		2013			2013	2013	2012		2012		2012			2012
	(Unaudited, In thousands, except share and per share information)
Basic income (loss) per share - As Reported(1)	$	0.11	$	(0.26	)	N/A	N/A	$	1.13	$	0.13	$	(0.14	)	$	0.20
Diluted income (loss) per share - As Reported(1)	$	0.11	$	(0.26	)	N/A	N/A	$	1.09	$	0.13	$	(0.14	)	$	0.20
Weighted-average number of shares outstanding, basic - As Reported(1)	47,859,774		48,008,998			N/A	N/A	44,367,499		47,944,193		48,332,878			48,335,865
Weighted-average number of shares outstanding, diluted - As Reported(1)	48,354,444		48,008,998			N/A	N/A	45,771,228		48,938,766		48,332,878			48,797,304

_______________________

(1) - Revision of Prior Period Earnings (Loss) Per Share - Two-Class Method. In connection with the preparation of the Company’s Quarterly Report on Form 10-Q as of and for the three months ended September 30, 2013, the Company determined that its basic and diluted net income (loss) per share calculations should have been prepared using the “two-class method.” Under the two-class method, securities that participate in dividends are considered “participating securities.” The Company’s unvested restricted shares outstanding are considered “participating securities” because they include non-forfeitable rights to dividends.

Pursuant to guidance set forth in Staff Accounting Bulletin (“SAB”) No. 99, “Materiality,” the Company concluded that the errors were not material to any of its prior period financial statements. Although the errors were immaterial to prior periods, the prior period financial statements presented herein were revised, in accordance with SAB No. 108, “Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements.”

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Commitments and Contingencies Operating Leases (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Year:
2014	$ 1,442
2015	1,553
2016	918
2017	318
2018	324
Thereafter	498
Total minimum lease payments	$ 5,053

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Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]	Noncontrolling Interests [Member]
Balance at Dec. 31, 2010	$ 113,853	$ 36	$ 0	$ 197,026	$ 0	$ (86,191)	$ 2,982
Common stock, shares outstanding at Dec. 31, 2010		36,029,068
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to Acacia Research Corporation	21,106					21,106
Sale of common stock, shares		5,750,000
Sale of common stock, value		6		175,223
Payments for Repurchase of Common Stock	0
Stock options exercised, shares		87,068
Stock options exercised, value	411	0		411
Stock issued during period, shares, share-based compensation, net of forfeitures		1,061,865
Compensation expense related to stock options and restricted stock awards	13,579	1		13,578
Excess tax benefits from stock-based compensation	583			583
Net income (loss) attributable to noncontrolling interest	539						539
Contributions from noncontrolling interests in operating subsidiary, net	1,539						1,539
Distributions to noncontrolling interests in operating subsidiary	(2,897)						(2,897)
Adjustments to Additional Paid in Capital, Other				0
Unrealized gain on foreign currency translation	0
Unrealized gain (loss) on short-term investments	(1,830)
Balance at Dec. 31, 2011	322,112	43	0	386,821	(1,830)	(65,085)	2,163
Common stock, shares outstanding at Dec. 31, 2011		42,928,001
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to Acacia Research Corporation	59,453					59,453
Sale of common stock, value		6		218,955
Treasury stock, shares acquired	1,129,408	(1,129,408)
Stock Repurchased During Period, Shares	(1,000)
Treasury stock, cost of shares acquired	(26,732)		(26,731)
Payments for Repurchase of Common Stock	26,732
Stock options exercised, shares		71,272
Stock options exercised, value	340			340
Stock issued during period, shares, share-based compensation, net of forfeitures		1,168,530
Compensation expense related to stock options and restricted stock awards	25,657	1		25,656
Excess tax benefits from stock-based compensation	13,210			13,210
Net income (loss) attributable to noncontrolling interest	(164)						(164)
Contributions from noncontrolling interests in operating subsidiary, net	5,793						5,793
Distributions to noncontrolling interests in operating subsidiary	(816)						(816)
Unrealized gain on foreign currency translation	7
Unrealized gain (loss) on short-term investments	657
Balance at Dec. 31, 2012	618,478	49	(26,731)	644,982	(1,166)	(5,632)	6,976
Common stock, shares outstanding at Dec. 31, 2012	49,160,844	49,160,844
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to Acacia Research Corporation	(56,434)
Sale of common stock, value	(18,633)	0		(18,633)
Treasury stock, shares acquired	600,000	(600,000)
Stock Repurchased During Period, Shares	(1,000)	(666)
Treasury stock, cost of shares acquired	(7,910)		(7,909)
Payments for Repurchase of Common Stock	7,926			(16)
Stock options exercised, shares	115,000	115,346
Stock options exercised, value	486			486
Stock issued during period, shares, share-based compensation, net of forfeitures		709,533
Compensation expense related to stock options and restricted stock awards	27,894	1		27,893
Excess tax benefits from stock-based compensation	(1,398)
Net income (loss) attributable to noncontrolling interest	(2,408)						(2,408)
Contributions from noncontrolling interests in operating subsidiary, net	1,920						1,920
Unrealized Gain (Loss) on Investments	219				219
Unrealized gain on foreign currency translation	0
Unrealized gain (loss) on short-term investments	26
Balance at Dec. 31, 2013	$ 562,198	$ 49	$ (34,640)	$ 653,314	$ (947)	$ (62,066)	$ 6,488
Common stock, shares outstanding at Dec. 31, 2013	49,385,057	49,385,057

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Consolidated Balance Sheets Parentheticals (USD $)	Dec. 31, 2013	Dec. 31, 2012
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, par value per share	$ 0.001	$ 0.001
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value per share	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	49,385,057	49,160,844
Common stock, shares outstanding	49,385,057	49,160,844
Treasury stock, shares	1,729,408	1,129,408

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Acquisition

12 Months Ended

Dec. 31, 2013

Business Combinations [Abstract]

Business Combination Disclosure [Text Block]

ACQUISITION

On January 12, 2012 (the “Acquisition Date”), pursuant to the terms and conditions of the Agreement and Plan of Merger dated as of November 22, 2011 (the “Merger Agreement”) among Acacia Research Group LLC (“ARG”), a wholly-owned subsidiary of Acacia, Apollo Patent Corp., a newly-formed, wholly-owned subsidiary of ARG (“Merger Sub”), ADAPTIX, a Delaware corporation, and Baker Communications Fund II (QP), L.P. solely in its capacity as shareholder representative, ARG completed its acquisition of ADAPTIX, which held no material assets other than its portfolio of patents and $10 million in cash, through a merger of Merger Sub with and into ADAPTIX, with ADAPTIX as the surviving corporation (the “Merger”). Upon completion of the Merger, the separate corporate existence of Merger Sub ceased and ADAPTIX became a wholly-owned subsidiary of ARG.

ADAPTIX, a pioneer in the development of 4G technologies for wireless systems, is a technology company recognized in the industry as one of the first developers of 4G wireless systems. With patents filed as early as 2000, ADAPTIX’s research and development efforts have resulted in a significant intellectual property portfolio focused on 4G technologies. With its growing portfolio of 230 issued and pending patents in 13 countries, ADAPTIX’s innovations extend across a broad range of 4G technologies including OFDMA and MIMO.

The Merger was being accounted for in accordance with the acquisition method of accounting under FASB ASC Topic 805, “Business Combinations” (“Topic 805”). Topic 805 requires, among other things, that identifiable assets acquired and liabilities assumed be recognized at their fair values as of the Acquisition Date. Under the acquisition method of accounting, the purchase consideration is allocated to the assets acquired, including tangible assets, patents and other identifiable intangible assets and liabilities assumed, based on their estimated fair market values on the date of acquisition. Any excess purchase price after the initial allocation to identifiable net tangible and identifiable intangible assets is assigned to goodwill. Amounts attributable to patents are amortized using the straight-line method over the estimated economic useful life of the underlying patents.

The total consideration paid by ARG in connection with the Merger was approximately $160 million, in cash. Based on the total purchase consideration and the estimate of the assets acquired and the liabilities assumed by ARG as of the Acquisition Date, the purchase price allocation was as follows ($ amounts in thousands):

				Amortization Period	Annual Amortization
Assets Acquired and Liabilities Assumed:
Fair value of net tangible assets acquired	$	10,000
Intangible assets acquired - patents	150,000			10 years	$	15,000
Goodwill	30,149
Net deferred income tax liability	(30,149		)
Total	$	160,000

Amounts attributable to the patents acquired are being amortized using the straight-line method over an estimated weighted average economic useful life of the underlying patents, which was estimated to be approximately 10 years. Goodwill is calculated as the residual after recording the identifiable net assets acquired and associated net deferred tax assets and liabilities.

Management is responsible for determining the fair value of the tangible and identifiable intangible assets acquired and liabilities assumed as of the Acquisition Date. Management considered a number of factors, including reference to an analysis under Topic 805 solely for the purpose of allocating the purchase price to the assets acquired and liabilities assumed. The analysis included a discounted cash flow which estimated future net cash flows resulting from the licensing and enforcement of the patent portfolio based on information as of the date of acquisition, considering assumptions and estimates related to potential infringers of the patents, applicable industries, usage of the underlying patented technologies, estimated license fee revenues, contingent legal fee arrangements, other estimated costs, tax implications and other factors. A discount rate consistent with the risks associated with achieving the estimated net cash flows was used to estimate the present value of estimated net cash flows.

The Merger was treated for tax purposes as a nontaxable transaction and as such, the historical tax bases of the acquired assets and assumed liabilities, net operating losses, and other tax attributes of ADAPTIX will carryover. As a result, no new tax goodwill will be created in connection with the Merger as there is no step-up to fair value of the underlying tax bases of the acquired net assets. Acquisition accounting includes the establishment of a net deferred tax asset or liability resulting from book tax basis differences related to assets acquired and liabilities assumed on the date of acquisition. Acquisition date deferred tax assets primarily relate to certain net operating loss carryforwards of ADAPTIX. Acquisition date deferred tax liabilities relate to specifically identified non-goodwill intangibles acquired. The estimated net deferred tax liability was determined as follows ($ amounts in thousands):

	Book Basis		Tax Basis		Difference
Intangible assets acquired - patents	$	150,000	$	—	$	(150,000	)
Estimated acquired deferred tax assets (including net operating loss carryforwards) - ADAPTIX	—		63,860		63,860
Net deferred tax liability - pretax					(86,140		)
Estimated tax rate					35		%
Estimated net deferred tax liability					$	(30,149	)

The following unaudited pro forma combined results of operations for periods presented are provided for illustrative purposes only and assume the acquisition occurred as of January 1, 2012. The unaudited pro forma combined financial results do not purport to be indicative of the results of operations for future periods or the results that actually would have been realized had the entities been a single entity during these periods. The unaudited pro forma combined results are presented in thousands, except share and per share information.

	2012			2011
Revenues	$	250,727		$	172,256
Total operating costs and expenses	170,953			159,674
Operating income	79,774			12,582
Interest and investment income	937			96
Income from operations before provision for income taxes	80,711			12,678
Provision for income taxes	(22,060		)	(8,708		)
Net income including noncontrolling interests in operating subsidiaries	58,651			3,970
Net loss (income) attributable to noncontrolling interests in operating subsidiaries	164			(539		)
Net income attributable to Acacia Research Corporation	$	58,815		$	3,431

	2012		2011
Pro forma income per common share attributable to Acacia Research Corporation:
Basic earnings per share	$	1.24	$	0.09
Diluted earnings per share	$	1.22	$	0.08
Weighted average number of shares outstanding, basic	47,251,061		39,743,433
Weighted average number of shares outstanding, diluted	48,060,647		41,258,297

Pro forma adjustments primarily relate to the amortization of identifiable intangible assets acquired over an estimated economic useful life of ten years, historical operating expenses of ADAPTIX for 2012, and the expensing of acquisition costs incurred by ARG in connection with the Merger.

The unaudited pro forma combined statements of income for the periods presented herein have been adjusted to give effect to pro forma events that are expected to have a continuing impact on the combined results. As such, the income tax benefit related to the release of valuation allowance reflected in the statement of operations for 2012, as described at Note 10, is not reflected in the accompanying unaudited pro forma combined statements of operations for the periods presented.

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Document and Entity Information Document (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 25, 2014	Jun. 30, 2013
Entity Information [Line Items]
Entity Registrant Name	ACACIA RESEARCH CORP
Entity Central Index Key	0000934549
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		50,640,123
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 1,084,840,000

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Stockholders' Equity

12 Months Ended

Dec. 31, 2013

Stockholders' Equity Note [Abstract]

Stockholders' Equity

STOCKHOLDERS’ EQUITY

Equity Offerings. In February 2012, Acacia raised gross proceeds of $225,000,000 through the sale of 6,122,449 shares of Acacia’s common stock at a price of $36.75 per share in a private placement offering with certain institutional accredited investors. Net proceeds, net of placement agent fees and estimated offering expenses, totaled approximately$218,961,000. The use of proceeds included the finance of pending and future acquisitions of patents and patent royalties and other patent licensing vehicles and companies with patent assets, and for working capital and general corporate purposes.

In March 2011, Acacia completed a public offering of 5,750,000 shares of common stock. The public offering price was $31.50 per share, and the net proceeds to the Company totaled approximately $175,229,000 after deducting underwriting discounts and related offering expenses. Acacia retained broad discretion over the use of the net proceeds from the sale of common stock including use for operations and for other general corporate purposes, including, but not limited to, working capital, strategic acquisitions and other transactions.

Repurchases of Common Stock. On November 16, 2012, Acacia’s Board of Directors authorized a program for repurchases of shares of Acacia’s outstanding common stock. Under the stock repurchase program, effective November 16, 2012, Acacia was authorized to purchase in the aggregate up to $100,000,000 of its outstanding common stock through the period ended May 15, 2013. On April 23, 2013, Acacia’s Board of Directors approved an extension of the stock repurchase program from May 15, 2013 until August 15, 2013. The November 16, 2012 program expired on August 15, 2013.

On November 15, 2013, Acacia’s Board of Directors authorized a program for repurchases of shares of Acacia’s outstanding common stock. Under the stock repurchase program, effective November 15, 2013, Acacia was authorized to purchase in the aggregate up to $70,000,000 of its of its outstanding common stock through the period ending May 14, 2014.

Repurchases may be made from time to time by Acacia in the open market or in block purchases in compliance with applicable Securities and Exchange Commission rules. Repurchases to date were made using existing cash resources and occurred in the open market. The authorization to repurchase shares presented an opportunity to reduce the outstanding share count and enhance stockholder value. Following are our monthly stock repurchases for the periods presented, all of which were purchased as part of publicly announced plans or programs:

	Total Number of Shares Purchased	Average Price paid per Share		Approximate Dollar Value of Shares that May Yet be Purchased under the Program		Plan Expiration
November 16, 2012 - November 30, 2012	256,262	$	21.58	$	—	August 15, 2013
December 1, 2012 - December 31, 2012	873,146	$	24.26	$	—	August 15, 2013
Totals for 2012	1,129,408	$	23.65
December 4, 2013 - December 11, 2013	600,000	$	13.18	$	62,074,000	May 14, 2014
Totals for 2013	600,000

Cash Dividends. On April 23, 2013, Acacia announced that its Board of Directors approved the adoption of a cash dividend policy that calls for the payment of an expected total annual cash dividend of $0.50 per common share, payable in the amount of $0.125 per share per quarter. Under the policy, the Company paid three quarterly cash dividends totaling $18,633,000 in 2013. While the Company paid dividends to holders of our common stock on a quarterly basis during fiscal year 2013, the declaration and payment of future dividends will depend on many factors, including, but not limited to, our earnings and financial condition, and any future dividends will be made solely at the discretion of our Board of Directors.

On February 20, 2014, Acacia announced that its Board of Directors approved a fourth quarterly cash dividend payable in the amount of $0.125 per share. The quarterly cash dividend will be paid on March 31, 2014 to shareholders of record at close of business on March 3, 2014.

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Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Revenues	$ 130,556	$ 250,727	$ 172,256
Cost of revenues:
Inventor royalties	29,724	26,028	43,727
Contingent legal fees	24,784	24,651	40,281
Litigation and licensing expenses - patents	39,335	21,591	13,005
Amortization of patents	53,658	39,019	9,745
Verdict insurance proceeds	0	0	(12,451)
Verdict insurance proceeds related costs	0	0	7,661
Marketing, general and administrative expenses (including non-cash stock compensation expense of $27,894 in 2013, $25,657 in 2012 and $13,579 in 2011)	59,229	54,083	35,693
Research, consulting and other expenses - business development	3,251	4,943	4,338
Other	3,506	0	0
Total operating costs and expenses	213,487	170,315	141,999
Operating income (loss)	(82,931)	80,412	30,257
Other income	0	500	0
Interest income	1,938	825	81
Write off of investment	0	(45)	0
Gain (loss) on investment	193	(343)	15
Total other income (expense)	2,131	937	96
Income (loss) from operations before benefit from (provision for) income taxes	(80,800)	81,349	30,353
Benefit from (provision for) income taxes	21,958	(22,060)	(8,708)
Net income (loss) including noncontrolling interests in operating subsidiaries	(58,842)	59,289	21,645
Net loss (income) attributable to noncontrolling interests in operating subsidiaries	2,408	164	(539)
Net income (loss) attributable to Acacia Research Corporation	(56,434)	59,453	21,106
Net Income (Loss) Available to Common Stockholders, Basic	(56,945)	57,564	20,265
Net Income (Loss) Available to Common Stockholders, Diluted	$ (56,945)	$ 57,577	$ 20,273
Basic income (loss) per common share	$ (1.18)	$ 1.22	$ 0.51
Diluted income (loss) per common share	$ (1.18)	$ 1.21	$ 0.50
Weighted-average number of shares outstanding, basic	48,155,832	47,251,061	39,743,433
Weighted-average number of shares outstanding, diluted	48,155,832	47,584,120	40,150,600
Common Stock, Dividends, Per Share, Cash Paid	$ 0.375	$ 0.000	$ 0.000

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Short-term Investments

12 Months Ended

Dec. 31, 2013

Short-term Investments [Abstract]

Short-Term Investments

SHORT-TERM INVESTMENTS

Short-term marketable securities for the periods presented were comprised of the following (in thousands):

	December 31, 2013
Security Type	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. government fixed income securities	$	130,971	$	21	$	(975	)	$	130,017
Total short-term investments	$	130,971	$	21	$	(975	)	$	130,017

	December 31, 2012
Security Type	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. government fixed income securities	$	87,394	$	20	$	(411	)	$	87,003
Equity securities of certain technology companies	3,254		—		(782		)	2,472
Total short-term investments	$	90,648	$	20	$	(1,193	)	$	89,475

Short-term investments at December 31, 2013 and 2012 were comprised of investments in highly liquid, AAA, U.S. government fixed income securities with maturity dates ranging from 2014 to 2015, and 2013 to 2014, respectively. Short-term marketable securities in unrealized loss positions at December 31, 2013 and 2012 have been in continuous unrealized loss positions for less than one year.

U.S. government fixed income securities. The gross unrealized loss can be primarily attributed to a combination of market conditions as well as the demand for and duration of the U.S. government fixed income securities. The Company has the ability to hold these securities until maturity, currently has no intent to sell, there is no requirement to sell and the Company believes that it can recover the amortized cost of these investments. The Company has found no evidence of impairment due to credit losses in its portfolio. Therefore, these unrealized losses were recorded in other comprehensive income (loss). However, the Company cannot provide any assurance that its portfolio of short-term marketable securities will not be impacted by adverse conditions in the financial markets, which may require the Company in the future to record an impairment charge for credit losses which could adversely impact its financial results.

For the year ended December 31, 2013, proceeds from the sale of short-term marketable securities classified as available-for-sale were $239,370,000, gross realized gains were $1,174,000 and gross realized losses were $981,000. For the year ended December 31, 2012, proceeds from the sale of short-term marketable securities classified as available-for-sale were $319,811,000, gross realized gains were $31,000 and gross realized losses were $555,000. Proceeds from the sale of short-term marketable securities classified as available-for-sale and related gross realized gains and losses were not material for the year ended December 31, 2011.

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Accounting Principles and Fiscal Year End.  The consolidated financial statements and accompanying notes are prepared on the accrual basis of accounting in accordance with generally accepted accounting principles in the United States of America. Acacia has a December 31 fiscal year end.

Principles of Consolidation.  The accompanying consolidated financial statements include the accounts of Acacia and its wholly and majority-owned and controlled subsidiaries. Material intercompany transactions and balances have been eliminated in consolidation.

Noncontrolling interests in Acacia’s majority-owned and controlled operating subsidiaries (“noncontrolling interests”) are separately presented as a component of stockholders’ equity in the consolidated statements of stockholders’ equity for the applicable periods presented. Consolidated net income or (loss) is adjusted to include the net (income) or loss attributed to noncontrolling interests in the consolidated statements of operations for the applicable periods presented. Refer to the accompanying consolidated statements of stockholders’ equity for total noncontrolling interests for the applicable periods presented.

In August 2010, a wholly owned subsidiary of Acacia became the general partner of the Acacia Intellectual Property Fund, L.P. (the “Acacia IP Fund”), which was formed in August 2010. The Acacia IP Fund is included in the Company’s consolidated financial statements for the periods presented, as Acacia’s wholly owned subsidiary, as the general partner, has the ability to control the operations and activities of the Acacia IP Fund. Refer to Note 12 to these consolidated financial statements.

Revenue Recognition.  Revenue is recognized when (i) persuasive evidence of an arrangement exists, (ii) all obligations have been substantially performed pursuant to the terms of the arrangement, (iii) amounts are fixed or determinable, and (iv) the collectibility of amounts is reasonably assured.

In general, revenue arrangements provide for the payment of contractually determined fees in consideration for the grant of certain intellectual property rights for patented technologies owned or controlled by Acacia’s operating subsidiaries. These rights typically include some combination of the following: (i) the grant of a non-exclusive, retroactive and future license to manufacture and/or sell products covered by patented technologies owned or controlled by Acacia’s operating subsidiaries, (ii) a covenant-not-to-sue, (iii) the release of the licensee from certain claims, and (iv) the dismissal of any pending litigation. The intellectual property rights granted may be perpetual in nature, extending until the expiration of the related patents, or can be granted for a defined, relatively short period of time, with the licensee possessing the right to renew the agreement at the end of each contractual term for an additional minimum upfront payment. Pursuant to the terms of these agreements, Acacia’s operating subsidiaries have no further obligation with respect to the grant of the non-exclusive retroactive and future licenses, covenants-not-to-sue, releases, and other deliverables, including no express or implied obligation on Acacia’s operating subsidiaries’ part to maintain or upgrade the technology, or provide future support or services. Generally, the agreements provide for the grant of the licenses, covenants-not-to-sue, releases, and other significant deliverables upon execution of the agreement, or upon receipt of the minimum upfront payment for term agreement renewals. As such, the earnings process is complete and revenue is recognized upon the execution of the agreement, when collectibility is reasonably assured, or upon receipt of the minimum upfront fee for term agreement renewals, and when all other revenue recognition criteria have been met.

Certain of the Company’s revenue arrangements provide for future royalties or additional required payments based on future licensee activities. Additional royalties are recognized in revenue upon resolution of the related contingency provided that all revenue recognition criteria, as described above, have been met. Amounts of additional royalties due under these license agreements, if any, cannot be reasonably estimated by management.

Certain of the Company’s revenue arrangements provide for the calculation of fees based on a licensee’s actual quarterly sales or actual per unit activity, applied to a contractual royalty rate. Licensees that pay fees on a quarterly basis generally report actual quarterly sales or actual per unit activity information and related quarterly fees due within 30 days to 45 days after the end of the quarter in which such sales or activity takes place. The amount of fees due under these revenue arrangements each quarter cannot be reasonably estimated by management. Consequently, Acacia’s operating subsidiaries recognize revenue from these revenue arrangements on a three-month lag basis, in the quarter following the quarter of sales or per unit activity, provided amounts are fixed or determinable and collectibility is reasonably assured. The lag method described above allows for the receipt of licensee royalty reports prior to the recognition of revenue.

Amounts related to revenue arrangements that do not meet the revenue recognition criteria described above are deferred until the revenue recognition criteria are met.

Acacia assesses the collectibility of fees receivable based on a number of factors, including past transaction history and credit-worthiness of licensees. If it is determined that collection is not reasonably assured, the fee is recognized when collectibility becomes reasonably assured, assuming all other revenue recognition criteria have been met, which is generally upon receipt of cash.

Cost of Revenues.  Cost of revenues include the costs and expenses incurred in connection with Acacia’s patent licensing and enforcement activities, including inventor royalties paid to original patent owners, contingent legal fees paid to external patent counsel, other patent-related legal expenses paid to external patent counsel, licensing and enforcement related research, consulting and other expenses paid to third-parties and the amortization of patent-related acquisition costs. These costs are included under the caption “Cost of revenues” in the accompanying consolidated statements of operations.  

Inventor Royalties and Contingent Legal Expenses. Inventor royalties are expensed in the consolidated statements of operations in the period that the related revenues are recognized. In certain instances, pursuant to the terms of the underlying inventor agreements, costs paid by Acacia’s operating subsidiaries to acquire patents are recoverable from future net revenues. Patent acquisition costs that are recoverable from future net revenues are amortized over the estimated economic useful life of the related patents, or as the prepaid royalties are earned by the inventor, as appropriate, and the related expense is included in amortization expense in the consolidated statements of operations. Any unamortized patent acquisition costs recovered from net revenues are expensed in the period recovered, and included in amortization expense in the consolidated statements of operations.

Contingent legal fees are expensed in the consolidated statements of operations in the period that the related revenues are recognized. In instances where there are no recoveries from potential infringers, no contingent legal fees are paid; however, Acacia’s operating subsidiaries may be liable for certain out of pocket legal costs incurred pursuant to the underlying legal services agreement. Legal fees advanced by contingent law firms that are required to be paid in the event that no license recoveries are obtained are expensed as incurred and included in liabilities in the consolidated balance sheets.

Fair Value Measurements. U.S. generally accepted accounting principles define fair value as the price that would be received for an asset or the exit price that would be paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants on the measurement date, and also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs, where available. The three-level hierarchy of valuation techniques established to measure fair value, is defined as follows:

●	Level 1 -	Observable Inputs:  Quoted prices in active markets for identical investments;
●	Level 2 -	Pricing Models with Significant Observable Inputs:  Other significant observable inputs, including quoted prices for similar investments, interest rates, credit risk, etc.; and
●	Level 3 -	Unobservable Inputs:  Significant unobservable inputs, including the entity’s own assumptions in determining the fair value of investments.

 Whenever possible, the Company is required to use observable market inputs (Level 1 - quoted market prices) when measuring fair value.

Cash and Cash Equivalents.  Acacia considers all highly liquid, short-term investments with original maturities of three months or less when purchased to be cash equivalents. For the periods presented, Acacia’s cash equivalents are comprised of investments in AAA rated money market funds that invest in first-tier only securities, which primarily includes: domestic commercial paper, securities issued or guaranteed by the U.S. government or its agencies, U.S. bank obligations, and fully collateralized repurchase agreements. Acacia’s cash equivalents are measured at fair value using quoted prices that represent Level 1 inputs.

Investments in Marketable Securities.  Investments in securities with original maturities of greater than three months and less than one year and other investments representing amounts that are available for current operations are classified as short-term investments, unless there are indications that such investments may not be readily sold in the short term. The fair values of these investments approximate their carrying values. At December 31, 2013 and 2012, all of Acacia’s investments were classified as available-for-sale, which are reported at fair value on a recurring basis using significant observable inputs (Level 1) whenever possible, with related unrealized gains and losses in the value of such securities recorded as a separate component of other comprehensive income (loss) in stockholders’ equity until realized. Realized and unrealized gains and losses are recorded based on the specific identification method. Interest on all securities is included in interest income.

Impairment of Marketable Securities. Acacia evaluates its investments in marketable securities for potential impairment, employing a systematic methodology on a quarterly basis that considers available quantitative and qualitative evidence. If the cost or carrying value of an investment exceeds its estimated fair value, the Company evaluates, among other factors, general market conditions, credit quality of instrument issuers, the duration and extent to which the fair value is less than cost, and the Company’s intent and ability to hold, or plans or ability to sell. Fair value is estimated based on publicly available market information or other estimates determined by management. Investments are considered to be impaired when a decline in fair value is estimated to be other-than-temporary. Acacia reviews impairments associated with its investments in marketable securities and determines the classification of any impairment as temporary or other-than-temporary. An impairment is deemed other-than-temporary unless (a) Acacia has the ability and intent to hold an investment for a period of time sufficient for recovery of its carrying amount and (b) positive evidence indicating that the investment’s carrying amount is recoverable within a reasonable period of time outweighs any evidence to the contrary. All available evidence, both positive and negative, is considered to determine whether, based on the weight of such evidence, the carrying amount of the investment is recoverable within a reasonable period of time. For investments classified as available-for-sale, unrealized losses that are other-than-temporary are recognized in the consolidated statements of operations.  

Concentration of Credit Risks.  Financial instruments that potentially subject Acacia to concentrations of credit risk are cash equivalents, investments and accounts receivable. Acacia places its cash equivalents and investments primarily in highly rated money market funds and investment grade marketable securities. Cash equivalents are also invested in deposits with certain financial institutions and may, at times, exceed federally insured limits. Acacia has not experienced any significant losses on its deposits of cash and cash equivalents.

Two licensees individually accounted for 38% and 16%, respectively, of revenues recognized during the year ended December 31, 2013. Four licensees individually accounted for 21%, 14%, 10% and 10%, respectively, of revenues recognized during the year ended December 31, 2012. Three licensees individually accounted for 26%, 17% and 15%, respectively, of revenues recognized during the year ended December 31, 2011. Two licensees individually represented approximately 60% and 22%, respectively, of accounts receivable at December 31, 2013. Three licensees individually represented approximately 34%, 30% and 25% of accounts receivable at December 31, 2012. For 2013, 2012 and 2011, 24%, 43% and 49%, respectively, of revenues were attributable to licensees domiciled in foreign jurisdictions, based on the jurisdiction of the entity obligated to satisfy payment obligations pursuant to the applicable revenue arrangement. The Company does not have any material foreign operations.

Acacia performs credit evaluations of its licensees with significant receivable balances, if any, and has not experienced any significant credit losses. Accounts receivable are recorded at the executed contract amount and generally do not bear interest. Collateral is not required. An allowance for doubtful accounts may be established to reflect the Company’s best estimate of probable losses inherent in the accounts receivable balance, and is reflected as a contra-asset account on the balance sheet and a charge to operating expenses in the statement of operations for the applicable period. The allowance is determined based on known troubled accounts, historical experience, and other currently available evidence. There was no allowance for doubtful accounts established for the periods presented.

Property and Equipment.  Property and equipment are recorded at cost. Major additions and improvements that materially extend useful lives of property and equipment are capitalized. Maintenance and repairs are charged against the results of operations as incurred. When these assets are sold or otherwise disposed of, the asset and related depreciation are relieved, and any gain or loss is included in the consolidated statements of operations for the period of sale or disposal. Depreciation and amortization is computed on a straight-line basis over the following estimated useful lives of the assets:

Furniture and fixtures	3 to 5 years
Computer hardware and software	3 to 5 years
Leasehold improvements	2 to 5 years (Lesser of lease term or useful life of improvement)

Rental payments on operating leases are charged to expense in the consolidated statements of operations on a straight-line basis over the lease term.

Organization Costs.  Costs of start-up activities, including organization costs, are expensed as incurred.

Patents.  Patents includes the cost of patents or patent rights (hereinafter, collectively “patents”), acquired from third-parties or acquired in connection with business combinations. Patent acquisition costs are amortized utilizing the straight-line method over their remaining economic useful lives, ranging from one to ten years. Certain patent application and prosecution costs incurred to secure additional patent claims, that based on management’s estimates are deemed to be recoverable, are capitalized and amortized over the remaining estimated economic useful life of the related patent portfolio.

Goodwill. Goodwill is tested for impairment at the reporting unit level (operating segment or one level below an operating segment) on an annual basis (December 31 for Acacia) and between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value. Acacia considers its market capitalization and the carrying value of its assets and liabilities, including goodwill, when performing its goodwill impairment test. When conducting its annual goodwill impairment assessment, the Company initially performs a qualitative evaluation of whether it is more likely than not that goodwill is impaired. If it is determined by a qualitative evaluation that it is more likely than not that goodwill is impaired, the Company then applies a two-step impairment test. The two-step impairment test first compares the fair value of the Company’s reporting unit to its carrying or book value. If the fair value of the reporting unit exceeds its carrying value, goodwill is not impaired and the Company is not required to perform further testing. If the carrying value of the reporting unit exceeds its fair value, the Company determines the implied fair value of the reporting unit’s goodwill and if the carrying value of the reporting unit’s goodwill exceeds its implied fair value, then an impairment loss equal to the difference is recorded in the consolidated statement of operations.

Impairment of Long-lived Assets. Acacia reviews long-lived assets and intangible assets for potential impairment annually (quarterly for patents) and when events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. In the event the sum of the expected undiscounted future cash flows resulting from the use of the asset is less than the carrying amount of the asset, an impairment loss equal to the excess of the asset’s carrying value over its fair value is recorded. If an asset is determined to be impaired, the loss is measured based on quoted market prices in active markets, if available. If quoted market prices are not available, the estimate of fair value is based on various valuation techniques, including a discounted value of estimated future cash flows.

Fair value is generally estimated using the “Income Approach,” focusing on the estimated future net income-producing capability of the patent portfolios over the estimated remaining economic useful life. Estimates of future after-tax cash flows are converted to present value through “discounting,” including an estimated rate of return that accounts for both the time value of money and investment risk factors. Estimated cash inflows are typically based on estimates of reasonable royalty rates for the applicable technology, applied to estimated market share data. Estimated cash outflows are based on existing contractual obligations, such as contingent legal fee and inventor royalty obligations, applied to estimated license fee revenues, in addition to other estimates of out-of-pocket expenses associated with a specific patent portfolio’s licensing and enforcement program. The analysis also contemplates consideration of current information about the patent portfolio including, status and stage of litigation, periodic results of the litigation process, strength of the patent portfolio, technology coverage and other pertinent information that could impact future net cash flows.

Fair Value of Financial Instruments.  The carrying value of cash and cash equivalents, investments, accounts receivables, accounts payable and accrued expenses approximates their fair values due to their short-term maturities.

Contingent Liabilities. The Company, from time to time, is involved in certain legal proceedings. Based upon consultation with outside counsel handling its defense in these matters and the Company’s analysis of potential outcomes, if the Company determines that a loss arising from such matters is probable and can be reasonably estimated, an estimate of the contingent liability is recorded in its consolidated financial statements. If only a range of estimated loss can be determined, an amount within the range that, based on estimates, assumptions and judgments, reflects the most likely outcome, is recorded as a contingent liability in the consolidated financial statements. In situations where none of the estimates within the estimated range is a better estimate of probable loss than any other amount, the Company records the low end of the range. Any such accrual would be charged to expense in the appropriate period. Litigation expenses for these types of contingencies are recognized in the period in which the litigation services were provided.

Stock-Based Compensation. The compensation cost for all stock-based awards is measured at the grant date, based on the fair value of the award, and is recognized as an expense, on a straight-line basis, over the employee’s requisite service period (generally the vesting period of the equity award) which is generally two to four years. The fair value of restricted stock and restricted stock unit awards is determined by the product of the number of shares or units granted and the grant date market price of the underlying common stock. The fair value of each option award is estimated on the date of grant using a Black-Scholes option valuation model. Stock-based compensation expense is recorded only for those awards expected to vest using an estimated forfeiture rate. Refer to Note 11 to these notes to consolidated financial statements for information on stock-based awards granted for the periods presented.

Income Taxes.  Income taxes are accounted for using an asset and liability approach that requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in Acacia’s consolidated financial statements or consolidated tax returns. A valuation allowance is established to reduce deferred tax assets if all, or some portion, of such assets will more than likely not be realized.

Under U.S. generally accepted accounting principles, a tax position is a position in a previously filed tax return or a position expected to be taken in a future tax filing that is reflected in measuring current or deferred income tax assets and liabilities. Tax positions are recognized only when it is more likely than not (likelihood of greater than 50%), based on technical merits, that the position will be sustained upon examination. Tax positions that meet the more likely than not threshold are measured using a probability weighted approach as the largest amount of tax benefit that is greater than 50% likely of being realized upon settlement.

Acacia recognizes interest and penalties with respect to unrecognized tax benefits in income tax expense. Acacia has identified no uncertain tax position for which it is reasonably possible that the total amount of unrecognized tax benefits will significantly increase or decrease within 12 months.

If a deduction reported on a tax return for an equity-based incentive award exceeds the cumulative compensation cost for those instruments recognized for financial reporting purposes, any resulting realized tax benefit that exceeds the previously calculated deferred tax asset for those instruments is considered an excess tax benefit, and is recognized as additional paid-in capital. If the tax deduction is less than the cumulative book compensation cost, the tax effect of the resulting difference is charged first to APIC, to the extent of the available pool of windfall tax benefits, with any remainder recognized in income tax expense.

Comprehensive Income (Loss).  Comprehensive income (loss) is the change in equity from transactions and other events and circumstances other than those resulting from investments by owners and distributions to owners.

Segment Reporting.  Acacia uses the management approach, which designates the internal organization that is used by management for making operating decisions and assessing performance as the basis of Acacia’s reportable segments. Acacia’s patent licensing and enforcement business constitutes its single reportable segment.

Use of Estimates.  The preparation of financial statements in conformity with generally accepted accounting principles in the United States of America requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates. Acacia believes that, of the significant accounting policies described herein, the accounting policies associated with revenue recognition, stock-based compensation expense, impairment of marketable securities and intangible assets, the determination of the economic useful life of amortizable intangible assets, income taxes and valuation allowances against net deferred tax assets and the application of the acquisition method of accounting for business combinations, require its most difficult, subjective or complex judgments.

Earnings (Loss) Per Share.  The Company computes net income (loss) attributable to common stockholders using the two-class method required for capital structures that include participating securities. Under the two-class method, securities that participate in non-forfeitable dividends, such as the Company’s outstanding unvested restricted stock, are considered “participating securities.”

In applying the two-class method, (i) basic net income (loss) per share is computed by dividing net income (loss) (less any dividends paid on participating securities) by the weighted average number of shares of common stock and participating securities outstanding for the period and (ii) diluted earnings per share may include the additional effect of other securities, if dilutive, in which case the dilutive effect of such securities is calculated by applying the two-class method and the treasury stock method to the assumed exercise or vesting of potentially dilutive common shares. The method yielding the more dilutive result is ultimately reported for the applicable period. Potentially dilutive common stock equivalents primarily consist of employee stock options, and restricted stock units for calculations utilizing the two-class method, and also include unvested restricted stock, when utilizing the treasury method.

The following table presents the weighted-average number of common shares outstanding used in the calculation of basic and diluted income per share:

	2013			2012			2011
Numerator (in thousands):
Basic
Net income (loss)	$	(56,434	)	$	59,453		$	21,106
Undistributed earnings allocated to participating securities	—			(1,889		)	(841		)
Total dividends paid	(18,633		)	—			—
Dividends attributable to common stockholders	18,122			—			—
Net income (loss) attributable to common stockholders – basic	$	(56,945	)	$	57,564		$	20,265
Diluted
Net income (loss)	$	(56,434	)	$	59,453		$	21,106
Undistributed earnings allocated to participating securities	—			(1,876		)	(833		)
Total dividends paid	(18,633		)	—			—
Dividends attributable to common stockholders	18,122			—			—
Net income (loss) attributable to common stockholders – diluted	$	(56,945	)	$	57,577		$	20,273
Denominator:
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders – basic	48,155,832			47,251,061			39,743,433
Effect of potentially dilutive securities:
Common stock options and restricted stock units	—			333,059			407,167
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders – diluted	48,155,832			47,584,120			40,150,600
Basic net income (loss) per common share	$	(1.18	)	$	1.22		$	0.51
Diluted net income (loss) per common share	$	(1.18	)	$	1.21		$	0.50
Anti-dilutive equity-based incentive awards excluded from the computation of diluted income (loss) per share	27,760			30,812			7,760

Revision of Prior Period Earnings (Loss) Per Share - Two-Class Method. In connection with the preparation of the Company’s Quarterly Report on Form 10-Q as of and for the three and nine months ended September 30, 2013, the Company determined that its basic and diluted net income (loss) per share calculations should have been prepared using the “two-class method.” Pursuant to guidance set forth in Staff Accounting Bulletin (“SAB”) No. 99, “Materiality,” the Company concluded that the errors were not material to any of its prior period financial statements. Although the errors were immaterial to prior periods, the prior period financial statements presented herein were revised, in accordance with SAB No. 108, “Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements.” The impact of the revision for the comparable prior period earnings (loss) per share calculations using the two-class method were as follows:

	2012		2011
Numerator:
Net income attributable to common stockholders – basic and diluted - As Reported	$	59,453	$	21,106
Net income attributable to common stockholders – basic - As Adjusted	$	57,564	$	20,265
Net income attributable to common stockholders – diluted - As Adjusted	$	57,577	$	20,273
Denominator:
Weighted-average shares used in computing net income per share attributable to common stockholders – basic - As Reported	47,251,061		39,743,433
Weighted-average shares used in computing net income per share attributable to common stockholders – basic - As Adjusted	47,251,061		39,743,433
Weighted-average shares used in computing net income per share attributable to common stockholders – diluted - As Reported	48,060,647		41,258,297
Weighted-average shares used in computing net income per share attributable to common stockholders – diluted - As Adjusted	47,584,120		40,150,600
Basic net income per common share - As Reported	$	1.26	$	0.53
Basic net income per common share - As Adjusted	$	1.22	$	0.51
Diluted net income per common share - As Reported	$	1.24	$	0.51
Diluted net income per common share - As Adjusted	$	1.21	$	0.50

Treasury Stock. Repurchases of the Company’s outstanding common stock are accounted for using the cost method. The applicable par value is deducted from the appropriate capital stock account on the formal or constructive retirement of treasury stock. Any excess of the cost of treasury stock over its par value is charged to additional paid-in capital, and reflected as Treasury Stock on the consolidated balance sheets.

Recently Adopted Accounting Pronouncements - Adopted Effective January 1, 2013. In February 2013, the Financial Accounting Standards Board (“FASB”) issued a new accounting standard requiring an entity to report the effect of significant reclassifications out of accumulated other comprehensive income on the respective line items in net income if the amount being reclassified is required under U.S. Generally Accepted Accounting Principles (“U.S. GAAP”) to be reclassified in its entirety to net income. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety to net income in the same reporting period, an entity is required to cross-reference other disclosures required under U.S. GAAP that provide additional detail about those amounts. This pronouncement is effective prospectively for reporting periods beginning after December 15, 2012. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements and related disclosures.

In December 2012, the FASB issued a new accounting standard that will require the Company to disclose information about offsetting and related arrangements to enable users of its financial statements to understand the effect of those arrangements on its financial position. The new guidance is effective for the Company’s interim period ending March 31, 2013. The disclosures required are to be applied retrospectively for all comparative periods presented. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements and related disclosures.

In July 2013, the FASB issued an accounting update which provides guidance on financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward or a tax credit carryforward exists in the same taxing jurisdiction. Per this guidance, an entity must present the unrecognized tax benefit as a reduction to a deferred tax asset, except when the carryforward is not available as of the reporting date under the governing tax law to settle taxes or the entity does not intend to use the deferred tax asset for this purpose. This amendment does not impact the recognition or measurement of uncertain tax positions or the disclosure reconciliation of gross unrecognized tax benefits. The new accounting standards update becomes effective for the Company on January 1, 2014 and it should be applied prospectively to unrecognized tax benefits that exist at the effective date with retrospective application permitted. Early adoption of the update is permitted and an entity may choose to apply this amendment retrospectively to each reporting period presented. The adoption of this accounting update did not have a material impact on the Company’s consolidated financial statements.

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Supplemental Cash Flow Information

12 Months Ended

Dec. 31, 2012

Supplemental Cash Flow Information [Abstract]

Supplemental Cash Flow Information

SUPPLEMENTAL CASH FLOW INFORMATION

Estimated federal taxes paid totaled $3,000,000, $0 and $0 for the years ended December 31, 2013, 2012 and 2011, respectively. At December 31, 2013, prepaid expenses and other current assets included federal and state income taxes receivable totaling $3,251,000. Cash paid for state income taxes totaled $516,000, $771,000 and $185,000 for the years ended December 31, 2013, 2012 and 2011, respectively. Foreign taxes withheld totaled $4,605,000, $11,890,000 and $7,586,000 for the years ended December 31, 2013, 2012 and 2011.

Refer to Note 6 to these notes to consolidated financial statements for information regarding noncash investing activity related to the acquisition of patents for the periods presented. Cash flows from financing activities for the year ended December 31, 2012 exclude $504,000 of accrued distributions payable to noncontrolling interests.

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Income Taxes

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Income Taxes

INCOME TAXES

Acacia’s provision for income taxes consists of the following (in thousands): 

	2013			2012			2011
Current:
Federal	$	—		$	—		$	179
State taxes	113			281			943
Foreign taxes	4,405			11,890			7,586
Total current	4,518			12,171			8,708
Deferred:
Federal	(26,151		)	10,085			—
State taxes	(325		)	(196		)	—
Total deferred	(26,476		)	9,889			—
Provision for income taxes	$	(21,958	)	$	22,060		$	8,708

The tax effects of temporary differences and carryforwards that give rise to significant portions of deferred tax assets and liabilities consist of the following at December 31, 2013 and 2012 (in thousands):

	2013			2012
Deferred tax assets:
Net operating loss and capital loss carryforwards and credits	$	34,679		$	15,668
Stock compensation	3,052			1,140
Basis of investments in affiliates	867			415
Accrued liabilities and other	387			250
Unrealized loss on short-term investments	337			415
State taxes	18			212
Total deferred tax assets	39,340			18,100
Deferred tax liabilities:
Fixed assets and intangibles	(33,378		)	(39,457		)
Other	(112		)	(60		)
Net deferred tax liabilities	5,850			(21,417		)
Less:  valuation allowance	(7,585		)	(5,396		)
Net deferred taxes	$	(1,735	)	$	(26,813	)

A reconciliation of the federal statutory income tax rate and the effective income tax rate is as follows:

	2013		2012		2011
Statutory federal tax rate - (benefit) expense	(35	)%	35	%	35	%
State income and foreign taxes, net of federal tax effect	5	%	15	%	27	%
Foreign tax credit	(6	)%	(15	)%	(25	)%
Noncontrolling interests in operating subsidiaries	1	%	—	%	(1	)%
Nondeductible permanent items	2	%	5	%	4	%
Expired net operating loss carryforwards	2	%	—	%	1	%
Valuation allowance	4	%	(13	)%	(12	)%
	(27	)%	27	%	29	%

At December 31, 2013 and 2012, the Company has recorded valuation allowances for certain tax attribute carryforwards and other deferred tax assets due to uncertainty regarding future realizability, as follows:

	December 31,
	2013		2012
Capital loss carryforwards	$	1,562	$	2,935
Net operating loss carryforwards	1,281		2,046
Foreign tax credits	4,405		—
Unrealized losses on short-term investments and other deferred tax assets	337		415
Total valuation allowance	$	7,585	$	5,396

Capital loss carryforwards and certain net operating loss carryforwards included in the valuation allowances for the periods presented, expire in varying amounts from 2014 through 2033. Foreign tax credits included in the valuation allowance were generated during the year ended December 31, 2013, and expire in 2023. In future periods, if the Company determines it will more likely than not be able to realize certain of these amounts, the applicable portion of the benefit from the release of the valuation allowance will generally be recognized in the statement of income in the period the determination is made.

Release of Valuation Allowance. As of December 31, 2011, Acacia maintained a full valuation allowance against its net deferred tax assets. The net deferred tax liability resulting from the acquisition of ADAPTIX in January 2012 created an additional source of income to utilize against the majority of Acacia’s existing consolidated net deferred tax assets. In addition, Acacia estimated that certain other deferred tax assets related to foreign tax credits and other state related deferreds were more likely than not realizable in future periods. Accordingly, the valuation allowance on the majority of the Company’s net deferred tax assets was released, resulting in a financial statement income tax benefit of $10,651,000 for the year ended December 31, 2012.

At December 31, 2013, Acacia had U.S. federal and state income tax NOLs totaling approximately $83,372,000 and $56,400,000, expiring between 2025 and 2033, and 2014 and 2033, respectively, for which $0 and $441,000 of federal and state net operating losses are included as a deferred tax asset which will be credited to additional paid-in capital when realized as a reduction of taxes payable on Acacia’s tax return. In addition, $1,928,000 and $37,725,000 of federal and state net operating losses are not included as a deferred tax asset and will be credited to additional paid-in capital when realized as a reduction of taxes payable on Acacia’s tax return as they relate to unrecognized excess tax benefits (see additional information regarding the ordering of windfall tax benefits and use of the “with-and-without” approach below). As of December 31, 2013, $0 and $441,000 of the valuation allowance related to the tax benefits of stock option deductions included in Acacia’s federal and state NOLs deferred tax asset, respectively.

At December 31, 2013, approximately $29,318,000 of the U.S. federal NOLs, acquired in connection with the acquisition of ADAPTIX, are subject to an annual utilization limitation of approximately $14,100,000, pursuant to the “change in ownership” provisions under Section 382 of the Internal Revenue Code of 1986, as amended (the “Code”).

As of December 31, 2013 Acacia has approximately $24,718,000 of foreign tax credits, expiring between 2015 and 2023, of which $20,313,000 has been utilized for financial statement purposes. Future realization of the credits as a reduction of taxes payable on Acacia’s tax return will result in an income tax benefit recognizable through additional paid in capital since the entire amount of the credits have been utilized for financial statement purposes under the “with-and-without approach.” In general, foreign taxes withheld may be claimed as a deduction on future U.S. corporate income tax returns, or as a credit against future U.S. income tax liabilities, subject to certain limitations.

Excluding the impact of the change in valuation allowance in fiscal years 2013, 2012 and 2011, our annual effective tax rates were (31%), 40% and 41%, respectively. In 2013, the rate at which we recorded the tax benefit associated with the pre-tax loss for the period was reduced from the statutory rate primarily due to certain nondeductible permanent items and expired capital loss carryforwards.  The Company recorded a valuation allowance on foreign tax credits generated in fiscal year 2013 totaling $4,605,000, as discussed above, and therefore, did not recognize the related tax benefit in fiscal year 2013.  The Company generated pretax income in 2012 and had significant nondeductible permanent items which increased our effective tax rate as shown above. The Company generated pretax income in fiscal year 2012, resulting in tax expense for the period. The fiscal year 2012 effective tax rate was lower than the U.S. federal statutory rate primarily due to $10.2 million of tax benefits recognized resulting from the release of valuation allowance on the majority of our net deferred tax assets in the first quarter of 2012, as discussed above.

The Company has elected to utilize the “with-and-without approach” regarding ordering of windfall tax benefits to determine whether the windfall tax benefit has reduced taxes payable. Under this approach, the windfall tax benefits would be recognized in additional paid in capital only if an incremental tax benefit is realized after considering all other tax benefits presently available to the Company. The deductions related to the exercise and vesting of equity-based incentive awards during the periods presented are, in general, available to offset taxable income on Acacia’s consolidated tax returns. Accordingly, the excess tax benefit related to the exercise and vesting of equity-based incentive awards for the periods presented, was credited to additional paid-in capital, not taxes payable. The actual tax benefit realized for excess tax deductions resulting from the exercise and vesting of equity-based incentive awards (noncash tax expense) totaled $13,210,000 and $583,000 for the years ended December 31, 2012 and 2011, respectively. For the year ended December 31, 2013, the Company incurred approximately $1,398,000 of net short falls from the exercise and vesting of equity-based incentive awards, of which $1,398,000 was recorded against its additional paid-in capital pool with no impact to the income statement.

Acacia is subject to taxation in the U.S. and various state jurisdictions. With no material exceptions, Acacia is no longer subject to U.S. federal or state examinations by tax authorities for years before 1997.

At December 31, 2013, the Company had total unrecognized tax benefits of approximately $2,127,000, including a recorded noncurrent liability of $85,000, related to unrecognized tax benefits primarily associated with state taxes. No interest and penalties have been recorded for the unrecognized tax benefits as of December 31, 2013. If recognized, approximately $2,127,000 would impact the Company’s effective tax rate. The Company does not expect that the liability for unrecognized tax benefits will change significantly within the next 12 months. Activity related to the gross unrecognized tax benefits for the year ended December 31, 2013 was as follows (in thousands):

Balance at January 1, 2012	$	85
Additions based on tax positions related to the current year	—
Additions for tax positions related to prior years	772
Additions resulting from the acquisition of ADAPTIX	1,270
Reductions	—
Balance at December 31, 2012	2,127
Reductions	—
Balance at December 31, 2013	$	2,127

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Goodwill and Other Identifiable Intangible Assets

12 Months Ended

Dec. 31, 2012

Patents [Abstract]

Patents

GOODWILL AND OTHER IDENTIFIABLE INTANGIBLE ASSETS

Acacia’s only identifiable intangible assets are patents and patent rights, with estimated remaining economic useful lives ranging from one to ten years. For all periods presented, all of Acacia’s identifiable intangible assets were subject to amortization. The gross carrying amounts and accumulated amortization related to acquired intangible assets as of December 31, 2013 and 2012 are as follows (in thousands): 

	2013			2012
Gross carrying amount - patents	$	400,755		$	383,379
Accumulated amortization - patents	(112,323		)	(69,850		)
Patents, net	$	288,432		$	313,529

The weighted-average remaining estimated economic useful life of Acacia’s patents and patent rights is 7 years. Scheduled annual aggregate amortization expense for each of the next five years through December 31, 2018 is estimated to be $47,654,000 in 2014, $46,554,000 in 2015, $44,051,000 in 2016, $43,268,000 in 2017, and $39,381,000 in 2018.

For the years ended December 31, 2013, 2012 and 2011, on a consolidated basis, Acacia’s operating subsidiaries incurred and capitalized patent and patent rights acquisition costs totaling $25,061,000, $178,260,000 (excluding the acquisition of ADAPTIX) and $14,680,000, respectively. The patents have estimated economic useful lives ranging from three to ten years. Included in capitalized patent costs as of December 31, 2013 are $4,000,000 of accrued future patent-related acquisition costs that management expects to incur pursuant to the terms of the underlying patent acquisition agreements, which are being amortized over the estimated economic useful life of the patents acquired.

Refer to Note 8 to these consolidated financial statements for additions to patents and goodwill in connection with Acacia’s acquisition of ADAPTIX and the related application of the acquisition method of accounting.

During the periods presented, certain operating subsidiaries recovered up-front patent portfolio acquisition costs from applicable net licensing proceeds prior to the scheduled amortization of such up-front patent portfolio acquisition costs, resulting in the acceleration of amortization expense for the applicable patent-related assets. For the years ended December 31, 2013, 2012 and 2011, accelerated amortization expense related to the recovery of up-front patent acquisition costs totaled $592,000, $10,574,000 and $3,111,000, respectively.

For the years ended December 31, 2013, 2012 and 2011, pursuant to the terms of the respective inventor agreements, certain Acacia operating subsidiaries elected to terminate or sell their rights to patent portfolios, resulting in the acceleration of amortization expense for the patent-related assets totaling $1,747,000, $3,034,000 and $1,103,000, respectively. Included in amortization of patents for the year ended December 31, 2013 are patent impairment charges totaling $4,619,000. The impairment charges, related to certain patent portfolios that management, in the fourth quarter of 2013, determined it would no longer allocate future resources to in connection with the licensing and enforcement of such portfolios, due primarily to potential prior art related complexities in two of the programs and/or the overall determination that future resources would be allocated to other licensing and enforcement programs with higher potential return profiles. The impairment charges consisted of the remaining net carrying value of the related portfolios as of December 31, 2013.

For the years ended December 31, 2013, 2012 and 2011, capitalized patent costs and accumulated amortization, and sales proceeds and other costs, related to patent-related sales and disposals are as follows (in thousands):

	2013		2012		2011
Capitalized patent costs	$	3,500	$	5,500	$	4,612
Accumulated amortization	1,753		2,466		3,509
Sales proceeds	1,000		2,792		11,000
Other costs	—		—		4,717

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Income Taxes Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory federal tax rate	(35.00%)	35.00%	35.00%
State income and foreign taxes, net of federal tax effect	5.00%	15.00%	27.00%
Foreign tax credit	(6.00%)	(15.00%)	(25.00%)
Noncontrolling interests in operating subsidiaries	1.00%	0.00%	(1.00%)
Non deductible permanent items	2.00%	5.00%	4.00%
Expired net operating loss carryforwards	2.00%	0.00%	1.00%
Valuation allowance	4.00%	(13.00%)	(12.00%)
Total	(27.00%)	27.00%	29.00%

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Property and Equipment

12 Months Ended

Dec. 31, 2013

Property, Plant and Equipment [Abstract]

Property and Equipment

PROPERTY AND EQUIPMENT

Property and equipment consists of the following at December 31, 2013 and 2012 (in thousands):

	2013			2012
Furniture and fixtures	$	783		$	472
Computer hardware and software	687			586
Leasehold improvements	306			173
	1,776			1,231
Less:  accumulated depreciation and amortization	(1,010		)	(892		)
	$	766		$	339

Depreciation expense was $236,000, $149,000 and $105,000 for the years ended December 31, 2013, 2012 and 2011, respectively. In 2013, we retired $130,000 of items held in property and equipment and recorded a $12,000 loss on disposal.

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Accounts Payable and Accrued Expenses

12 Months Ended

Dec. 31, 2013

Accounts Payable and Accrued Liabilities, Current [Abstract]

Accounts Payable and Accrued Expenses / Costs

ACCOUNTS PAYABLE AND ACCRUED EXPENSES

Accounts payable and accrued expenses consist of the following at December 31, 2013 and 2012 (in thousands):

	2013		2012
Accounts payable	$	128	$	642
Payroll and other employee benefits	1,039		1,815
Accrued vacation	813		703
Accrued legal expenses - patent	5,900		3,990
Accrued consulting and other professional fees	2,948		1,510
Accrued distribution to noncontrolling interests	504		504
Other accrued liabilities	223		71
	$	11,555	$	9,235

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Fair Value Measurements and Auction Rate Securities

12 Months Ended

Dec. 31, 2013

Fair Value Measurements and Auction Rate Securities [Abstract]

Fair Value Measurements and Auction Rate Securities

FAIR VALUE MEASUREMENTS AND AUCTION RATE SECURITIES

As of December 31, 2011, Acacia held investment grade auction rate securities with a par value totaling $2,425,000, consisting of auction rate investments backed by student loans, which were classified as noncurrent, available-for-sale and reflected at fair value. The fair values of these securities were estimated utilizing an analysis of certain unobservable inputs (Level 3) and by reference to periodic discounted cash flow analyses.

All outstanding auction rate securities as of December 31, 2011, were sold during the year ended December 31, 2012. For the year ended December 31, 2012 auction rate securities related recognized gains included in earnings totaled $118,000, and total settlements of auction rate securities totaled $2,074,000.

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Stock-Based Incentive Plans Stock Options (Details) (USD $)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation [Abstract]
Outstanding at December 31, 2012	313,000
Exercised	(115,000)
Expired/forfeited	(3,000)
Outstanding at December 31, 2013	195,000
Vested	195,000
Exercisable at December 31, 2013	195,000
Outstanding at December 31, 2012, weighted average exercise price	$ 5.87
Exercised, weighted average exercise price	$ 4.22
Expired/forfeited, weighted average exercise price	$ 1.85
Outstanding at December 31, 2013, weighted average exercise price	$ 6.91
Vested, weighted average exercise price	$ 6.91
Exercisable, weighted average exercise price	$ 6.91
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	1 year 7 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	1 year 7 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	1 year 7 months
Outstanding at December 31, 2013, aggregate, intrinsic value	$ 1,485,000
Vested, aggregate intrinsic value	1,485,000
Exercisable, aggregate intrinsic value	$ 1,485,000

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Stock-Based Incentive Plans Nonvested Restricted Stock Units (Details) (Restricted Stock Units (RSUs) [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Nonvested at December 31, 2012	38,000
Granted		0
Vested		(18,000)
Nonvested at December 31, 2013	20,000	38,000
Vested outstanding	94,000
Nonvested, weighted average grant date fair value at December 31, 2011	$ 26.98
Granted, weighted average grant date fair value	$ 0.00	$ 29.39	$ 24.87
Vested, weighted average grant date fair value		$ 26.05
Nonvested, weighted average grant date fair value at December 31, 2012	$ 27.83	$ 26.98
Vested outstanding, weighted average grant date fair value	$ 13.05

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Stock-Based Incentive Plans (Details) (USD $)	12 Months Ended												12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2013 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2012 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2011 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2009 2007 Plan [Member]	Dec. 31, 2013 2007 Plan [Member]	Dec. 31, 2008 2007 Plan [Member]	Dec. 31, 2013 Discretionary Option Grant Program [Member] Nonstatutory Options [Member]	Dec. 31, 2013 Stock Issuance Program [Member]	Dec. 31, 2013 2002 Plan [Member]	Dec. 31, 2013 2013 Plan [Member]	Dec. 31, 2013 Less than 10% [Member] Discretionary Option Grant Program [Member] Incentive Stock Options [Member]	Dec. 31, 2013 10% or More [Member] Discretionary Option Grant Program [Member] Incentive Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of fair market value on grant date, minimum exercise price													85.00%	100.00%			100.00%	110.00%
Increase in number of shares available, percentage of outstanding shares on last trading day of prior December										2.00%					3.00%
Ownership percent of voting stock	10.00%
Maximum number of shares available increase per year															500,000
Aggregate shares available for issuance															20,000,000
Number of shares available for grant											0	560,000				4,750,000
Aggregate intrinsic value of options exercised	$ 2,024,000	$ 1,796,000	$ 2,822,000
Weighted average grant date fair value of restricted stock granted				$ 24.31	$ 32.17	$ 29.24	$ 0.00	$ 29.39	$ 24.87
Aggregate fair value of restricted stock vested				22,317,000	28,865,000	11,043,000	469,000	363,000	257,000
Total unrecognized compensation expense for nonvested awards				$ 25,915,000			$ 480,000
Weighted average period over which unrecognized compensation expense will be recognized				1 year 9 months			1 year 7 months
Number of shares of common stock reserved for issuance	4,280,000

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Stock-Based Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2013

Share-based Compensation [Abstract]

Stock Options Activity

The following table summarizes stock option activity for the Plans for the year ended December 31, 2013:

			Weighted-Average
	Options		Exercise Price		Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at December 31, 2012	313,000		$	5.87
Exercised	(115,000	)	$	4.22
Expired/forfeited	(3,000	)	$	1.85
Outstanding at December 31, 2013	195,000		$	6.91	1.6 years	$	1,485,000
Vested	195,000		$	6.91	1.6 years	$	1,485,000
Exercisable at December 31, 2013	195,000		$	6.91	1.6 years	$	1,485,000

Nonvested Restricted Stock Activity

The following table summarizes nonvested restricted share activity for the year ended December 31, 2013:

	Nonvested Restricted Shares		Weighted Average Grant Date Fair Value
Nonvested restricted stock at December 31, 2012	1,353,000		$	30.17
Granted	823,000		$	24.31
Vested	(813,000	)	$	27.45
Canceled	(126,000	)	$	28.48
Nonvested restricted stock at December 31, 2013	1,237,000		$	28.23

Restricted Stock Units Activity

The following table summarizes restricted stock unit activity for the year ended December 31, 2013:

	Restricted Stock Units		Weighted Average Grant Date Fair Value
Nonvested restricted stock units outstanding at December 31, 2012	38,000		$	26.98
Granted	—		$	—
Vested	(18,000	)	$	26.05
Nonvested restricted stock units outstanding at December 31, 2013	20,000		$	27.83
Vested restricted stock units outstanding at December 31, 2013	94,000		$	13.05

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Acquisition (Details) (ADAPTIX, Inc. [Member], USD $)	0 Months Ended	12 Months Ended
	Jan. 12, 2012 patents countries	Dec. 31, 2013
ADAPTIX, Inc. [Member]
Business Acquisition [Line Items]
Acquired entity - cash	$ 10,000,000
Number of issued and pending patents in portfolio of acquired entity	230
Number of countries where acquire entity holds issued and pending patents	13
Payments to acquire businesses, gross	$ 160,000,000
Patents, useful life	10 years	10 years

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

COMMITMENTS AND CONTINGENCIES

Operating Leases

Acacia leases certain office space under various operating lease agreements expiring at various dates from 2014 through 2020. Minimum annual rental commitments for operating leases of continuing operations having initial or remaining noncancellable lease terms in excess of one year are as follows (in thousands):

Year
2014	$	1,442
2015	1,553
2016	918
2017	318
2018	324
Thereafter	498
Total minimum lease payments	$	5,053

Rent expense for the years ended December 31, 2013, 2012 and 2011 approximated $1,312,000, $898,000 and $915,000, respectively. Rental payments are expensed in the statements of operations in the period to which they relate. Scheduled rent increases are amortized on a straight-line basis over the lease term.

Inventor Royalties and Contingent Legal Expenses

In connection with the acquisition of certain patents and patent rights, certain of Acacia’s operating subsidiaries executed related agreements which grant to the former owners of the respective patents or patent rights, the right to receive inventor royalties based on future net revenues (as defined in the respective agreements) generated as a result of licensing and otherwise enforcing the respective patents or patent portfolios.

Acacia’s operating subsidiaries may retain the services of law firms that specialize in patent licensing and enforcement and patent law in connection with their licensing and enforcement activities. These law firms may be retained on a contingent fee basis whereby such law firms are paid on a scaled percentage of any negotiated fees, settlements or judgments awarded based on how and when the fees, settlements or judgments are obtained.

The economic terms of the inventor agreements, operating agreements and contingent legal fee arrangements associated with the patent portfolios owned or controlled by Acacia’s operating subsidiaries, if any, including royalty rates, contingent fee rates and other terms, vary across the patent portfolios owned or controlled by such operating subsidiaries. Inventor royalties, payments to noncontrolling interests and contingent legal fees expenses fluctuate period to period, based on the amount of revenues recognized each period, the terms and conditions of revenue agreements executed each period and the mix of specific patent portfolios with varying economic terms and obligations generating revenues each period. Inventor royalties and contingent legal fees expenses will continue to fluctuate and may continue to vary significantly period to period, based primarily on these factors.

During the years ended December 31, 2013 and 2012, Acacia entered into significant agreements with unrelated third-parties resolving pending patent matters that resulted in the grant of certain intellectual property rights and recognition of revenues, portions of which were not subject to inventor royalty and contingent legal fee arrangements, as well as the grant of licenses from certain of Acacia’s operating subsidiaries and recognition of revenues that were subject to inventor royalties and contingent legal fee arrangements. Certain revenues recognized subject to inventor royalties and contingent legal fees are based on a determination by the respective operating subsidiaries.

Patent Enforcement and Other Litigation

Acacia is subject to claims, counterclaims and legal actions that arise in the ordinary course of business. Management believes that the ultimate liability with respect to these claims and legal actions, if any, will not have a material effect on Acacia’s consolidated financial position, results of operations or cash flows. Certain of Acacia’s operating subsidiaries are often required to engage in litigation to enforce their patents and patent rights. In connection with any of Acacia’s operating subsidiaries’ patent enforcement actions, it is possible that a defendant may request and/or a court may rule that an operating subsidiary has violated statutory authority, regulatory authority, federal rules, local court rules, or governing standards relating to the substantive or procedural aspects of such enforcement actions. In such event, a court may issue monetary sanctions against Acacia or its operating subsidiaries or award attorney’s fees and/or expenses to a defendant(s), which could be material, and if required to be paid by Acacia or its operating subsidiaries, could materially harm the Company’s operating results and financial position.

Guarantees and Indemnifications

Certain of Acacia’s operating subsidiaries have made guarantees and indemnities under which they may be required to make payments to a guaranteed or indemnified party, in relation to certain transactions, including revenue transactions in the ordinary course of business. In connection with certain facility leases, Acacia and certain of its operating subsidiaries have indemnified lessors for certain claims arising from the facilities or the leases. Acacia indemnifies its directors and officers to the maximum extent permitted under the laws of the State of Delaware. However, Acacia has a directors and officers insurance policy that may reduce its exposure in certain circumstances and may enable it to recover a portion of future amounts that may be payable, if any. The duration of the guarantees and indemnities varies and, in many cases is indefinite but subject to statute of limitations. The majority of guarantees and indemnities do not provide any limitations of the maximum potential future payments that Acacia could be obligated to make. To date, Acacia has made no payments related to these guarantees and indemnities. Acacia estimates the fair value of its indemnification obligations to be insignificant based on this history and therefore, have not recorded any liability for these guarantees and indemnities in the accompanying consolidated balance sheets.

Other

In August 2010, a wholly owned subsidiary of Acacia became the general partner of the Acacia IP Fund, which was formed in August 2010. The Acacia IP Fund is authorized to raise up to $250 million. The Acacia IP Fund acquires, licenses and enforces intellectual property consisting primarily of patents, patent rights, and patented technologies. Refer to Note 2 to these notes to consolidated financial statements for information regarding the consolidation of majority-owned subsidiaries and the presentation of related noncontrolling interests. At December 31, 2013 and 2012, the Acacia IP Fund net assets were primarily comprised of the following (in thousands):

	December 31, 2013		December 31, 2012
Cash and other assets	$	2,927	$	2,542
Patents, net of accumulated amortization	1,373		7,144
Investments - noncurrent	11,120		11,617
Total assets	$	15,420	$	21,303
Accrued expenses and contributions	$	2,437	$	5,016
Accrued patent acquisition costs	—		500
Total liabilities	2,437		5,516
Net assets	$	12,983	$	15,787

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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Property and Equipment, Useful Lives

Depreciation and amortization is computed on a straight-line basis over the following estimated useful lives of the assets:

Furniture and fixtures	3 to 5 years
Computer hardware and software	3 to 5 years
Leasehold improvements	2 to 5 years (Lesser of lease term or useful life of improvement)

Schedule of Earnings Per Share, Basic and Diluted

The following table presents the weighted-average number of common shares outstanding used in the calculation of basic and diluted income per share:

	2013			2012			2011
Numerator (in thousands):
Basic
Net income (loss)	$	(56,434	)	$	59,453		$	21,106
Undistributed earnings allocated to participating securities	—			(1,889		)	(841		)
Total dividends paid	(18,633		)	—			—
Dividends attributable to common stockholders	18,122			—			—
Net income (loss) attributable to common stockholders – basic	$	(56,945	)	$	57,564		$	20,265
Diluted
Net income (loss)	$	(56,434	)	$	59,453		$	21,106
Undistributed earnings allocated to participating securities	—			(1,876		)	(833		)
Total dividends paid	(18,633		)	—			—
Dividends attributable to common stockholders	18,122			—			—
Net income (loss) attributable to common stockholders – diluted	$	(56,945	)	$	57,577		$	20,273
Denominator:
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders – basic	48,155,832			47,251,061			39,743,433
Effect of potentially dilutive securities:
Common stock options and restricted stock units	—			333,059			407,167
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders – diluted	48,155,832			47,584,120			40,150,600
Basic net income (loss) per common share	$	(1.18	)	$	1.22		$	0.51
Diluted net income (loss) per common share	$	(1.18	)	$	1.21		$	0.50
Anti-dilutive equity-based incentive awards excluded from the computation of diluted income (loss) per share	27,760			30,812			7,760

Impact of the Revision to the Comparable Prior Period Earnings (Loss) Per Share Calculations Using the Two-Class Method [Table Text Block]

The impact of the revision for the comparable prior period earnings (loss) per share calculations using the two-class method were as follows:

	2012		2011
Numerator:
Net income attributable to common stockholders – basic and diluted - As Reported	$	59,453	$	21,106
Net income attributable to common stockholders – basic - As Adjusted	$	57,564	$	20,265
Net income attributable to common stockholders – diluted - As Adjusted	$	57,577	$	20,273
Denominator:
Weighted-average shares used in computing net income per share attributable to common stockholders – basic - As Reported	47,251,061		39,743,433
Weighted-average shares used in computing net income per share attributable to common stockholders – basic - As Adjusted	47,251,061		39,743,433
Weighted-average shares used in computing net income per share attributable to common stockholders – diluted - As Reported	48,060,647		41,258,297
Weighted-average shares used in computing net income per share attributable to common stockholders – diluted - As Adjusted	47,584,120		40,150,600
Basic net income per common share - As Reported	$	1.26	$	0.53
Basic net income per common share - As Adjusted	$	1.22	$	0.51
Diluted net income per common share - As Reported	$	1.24	$	0.51
Diluted net income per common share - As Adjusted	$	1.21	$	0.50

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Goodwill and Other Identifiable Intangible Assets Future Amortization Expense (Details) (USD $)	Dec. 31, 2013
Patents [Abstract]
2014	$ 47,654,000
2015	46,554,000
2016	44,051,000
2017	43,268,000
2018	$ 39,381,000

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Summary of Significant Accounting Policies Earnings per share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]
Net Income (Loss) Attributable to Acacia Research Corporation	$ (33,333)	$ (15,711)	$ (12,503)	$ 5,113	$ 9,823	$ (6,619)	$ 6,321	$ 49,928	$ (56,434)	$ 59,453	$ 21,106
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted									0	(1,876)	(833)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic									0	(1,889)	(841)
Payments of Dividends									18,633	0	0
Dividends attributable to common stockholders under the two class method									18,122	0	0
Net Income (Loss) Available to Common Stockholders, Basic									(56,945)	57,564	20,265
Net Income (Loss) Available to Common Stockholders, Diluted									$ (56,945)	$ 57,577	$ 20,273
Weighted-average number of shares outstanding, basic - As Adjusted(1)	48,415,684	48,330,149	48,008,998	47,859,774	48,335,865	48,332,878	47,944,193	44,367,499	48,155,832	47,251,061	39,743,433
Weighted Average Number Diluted Shares Outstanding Adjustment									0	333,059	407,167
Weighted-average number of shares outstanding, diluted - As Adjusted(1)	48,415,684	48,330,149	48,008,998	48,104,242	48,607,141	48,332,878	48,294,782	44,764,064	48,155,832	47,584,120	40,150,600
Basic income (loss) per common share	$ (0.69)	$ (0.33)	$ (0.26)	$ 0.10	$ 0.20	$ (0.14)	$ 0.13	$ 1.08	$ (1.18)	$ 1.22	$ 0.51
Diluted income (loss) per common share	$ (0.69)	$ (0.33)	$ (0.26)	$ 0.10	$ 0.20	$ (0.14)	$ 0.13	$ 1.08	$ (1.18)	$ 1.21	$ 0.50
Anti-dilutive equity-based incentive awards excluded from the computation of diluted income (loss) per share									27,760	30,812	7,760

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Consolidated Statements of Operations Parentheticals (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Non-cash stock compensation	$ 27,894	$ 25,657	$ 13,579

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Description of Business

12 Months Ended

Dec. 31, 2013

DESCRIPTION OF BUSINESS [Abstract]

Description of Business

DESCRIPTION OF BUSINESS

Description of Business. As used herein, “Acacia” and the “Company” refer to Acacia Research Corporation and/or its wholly and majority-owned and controlled operating subsidiaries. All patent acquisition, prosecution, licensing and enforcement activities are conducted solely by certain of Acacia’s wholly and majority-owned and controlled operating subsidiaries.

Acacia’s operating subsidiaries acquire rights in, license and enforce patented technologies. Acacia’s operating subsidiaries partner with inventors and patent owners, applying their legal and technology expertise to patent assets to unlock the financial value in their patented inventions. Acacia is an intermediary in the patent marketplace, bridging the gap between invention and application, facilitating efficiency and delivering monetary rewards to patent owners.

Acacia’s operating subsidiaries generate revenues and related cash flows from the granting of intellectual property rights for the use of patented technologies that its operating subsidiaries control or own. Acacia’s operating subsidiaries assist patent owners with the prosecution and development of their patent portfolios, the protection of their patented inventions from unauthorized use, the generation of licensing revenue from users of their patented technologies and, where necessary, with the enforcement against unauthorized users of their patented technologies through the filing of patent infringement litigation.

Acacia’s operating subsidiaries are principals in the licensing and enforcement effort, obtaining control of the rights in the patent portfolio, or control of the patent portfolio outright. Acacia’s operating subsidiaries own or control the rights to multiple patent portfolios, which include U.S. patents and certain foreign counterparts, covering technologies used in a wide variety of industries.

In January 2012, a wholly owned operating subsidiary of Acacia acquired ADAPTIX, Inc. (“ADAPTIX”), a pioneer in the development of 4G technologies for wireless systems, for cash consideration of $150 million, net of cash acquired, as described at Note 8 to these consolidated financial statements.

Acacia was incorporated on January 25, 1993 under the laws of the State of California. In December 1999, it changed its state of incorporation from California to Delaware.

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Income Taxes Provision for Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:
Federal									$ 0	$ 0	$ 179
State taxes									113	281	943
Foreign taxes									4,405	11,890	7,586
Total current									4,518	12,171	8,708
Deferred:
Federal									(26,151)	10,085	0
State taxes									(325)	(196)	0
Total deferred									(26,476)	9,889	0
(Provision) benefit for income taxes	$ 3,390	$ (19,570)	$ (9,050)	$ 3,272	$ 5,757	$ (1,938)	$ 3,494	$ 14,747	$ (21,958)	$ 22,060	$ 8,708

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Supplemental Cash Flow Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Cash Flow Information [Abstract]
Estimated federal income taxes paid	$ 3,000,000	$ 0	$ 0
Income Taxes Receivable	3,251,000
Accrued distribution to noncontrolling interest	504,000	504,000
Cash paid for state income taxes	516,000	771,000	185,000
Foreign withholding taxes	$ 4,605,000	$ 11,890,000	$ 7,586,000

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Short-term Investments (Tables)

12 Months Ended

Dec. 31, 2013

Short-term Investments [Abstract]

Short-term Investments

Short-term marketable securities for the periods presented were comprised of the following (in thousands):

	December 31, 2013
Security Type	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. government fixed income securities	$	130,971	$	21	$	(975	)	$	130,017
Total short-term investments	$	130,971	$	21	$	(975	)	$	130,017

	December 31, 2012
Security Type	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. government fixed income securities	$	87,394	$	20	$	(411	)	$	87,003
Equity securities of certain technology companies	3,254		—		(782		)	2,472
Total short-term investments	$	90,648	$	20	$	(1,193	)	$	89,475

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Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2013
Lag time in recognizing revenues from licensee's quarter	3 months
Minimum [Member]
Period after quarter end licensees report activity	30 days
Patents, useful life	1 year
Maximum [Member]
Period after quarter end licensees report activity	45 days
Patents, useful life	10 years

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Stock-Based Incentive Plans

12 Months Ended

Dec. 31, 2013

Share-based Compensation [Abstract]

Stock-based Incentive Plans

STOCK-BASED INCENTIVE PLANS

The 2002 Acacia Technologies Stock Incentive Plan (“2002 Plan”), the 2007 Acacia Technologies Stock Incentive Plan (“2007 Plan”) and the 2013 Acacia Research Corporation Stock Incentive Plan (“2013 Plan”) (collectively, the “Plans”) were approved by the stockholders of Acacia in December 2002, May 2007 and May 2013, respectively. All Plans allow grants of stock options, stock awards and performance shares with respect to Acacia common stock to eligible individuals, which generally includes directors, officers, employees and consultants. Except as noted below, the terms and provisions of the Plans are identical in all material respects. The term of the 2002 Plan expired in December 2012.

Acacia’s compensation committee administers the discretionary option grant and stock issuance programs. The compensation committee determines which eligible individuals are to receive option grants or stock issuances under those programs, the time or times when the grants or issuances are to be made, the number of shares subject to each grant or issuance, the status of any granted option as either an incentive stock option or a non-statutory stock option under the federal tax laws, the vesting schedule to be in effect for the option grant or stock issuance and the maximum term for which any granted option is to remain outstanding. The exercise price of options is generally equal to the fair market value of Acacia’s common stock on the date of grant. Options generally begin to be exercisable six months to one year after grant and generally expire ten years after grant. Stock options generally vest over two to three years and restricted shares generally vest in full after two to three years (generally representing the requisite service period). The Plans terminate no later than the tenth anniversary of the approval of the incentive plans by Acacia’s stockholders.

The Plans provide for the following separate programs:

• Discretionary Option Grant Program. Under the discretionary option grant program, Acacia’s compensation committee may grant (1) non-statutory options to purchase shares of common stock to eligible individuals in the employ or service of Acacia or its subsidiaries (including employees, non-employee board members and consultants) at an exercise price not less than 85% of the fair market value of those shares on the grant date, and (2) incentive stock options to purchase shares of common stock to eligible employees at an exercise price not less than 100% of the fair market value of those shares on the grant date (not less than 110% of fair market value if such employee actually or constructively owns more than 10% of Acacia’s voting stock or the voting stock of any of its subsidiaries).

• Stock Issuance Program. Under the stock issuance program, eligible individuals may be issued shares of common stock directly, upon the attainment of performance milestones or the completion of a specified period of service or as a bonus for past services. Under this program, the purchase price for the shares shall not be less than 100% of the fair market value of the shares on the date of issuance, and payment may be in the form of cash or past services rendered.

• Automatic Option Grant Program (2002 and 2013Plans only). Commencing in fiscal 2008, each non-employee director will receive restricted stock units for the number of shares determined by dividing the annual retainer by the closing price of Acacia’s common stock on the grant date, provided that such individual has served as a non-employee director for at least 6 months. In addition, as of May 2007, each new non-employee director will receive restricted stock units for the number of shares determined by dividing the annual board of directors retainer by the closing price of Acacia’s common stock on the commencement date. Restricted stock units vest in a series of twelve quarterly installments over the three year period following the grant date, subject to immediate acceleration upon a change in control. Acacia will deliver shares corresponding to the vested restricted stock units within thirty (30) days after the first to occur of the following events: (i) the fifth (5th) anniversary of the grant date; or (ii) termination of the non-employee director’s service as a member of the Company’s Board of Directors. The non-employee directors do not have any rights, benefits or entitlements with respect to any shares unless and until the shares have been delivered.

The number of shares of common stock available for issuance under the 2002 Plan automatically increased on the first trading day of January each calendar year during the term of the Plan by an amount equal to three percent (3%) of the total number of shares of common stock outstanding on the last trading day in December of the immediately preceding calendar year, not to exceed 500,000 shares. The aggregate number of shares of common stock available for issuance under the 2002 Plan could not exceed 20,000,000 shares. At December 31, 2013, there were no shares available for grant under the expired 2002 Plan.

The initial share reserve under the 2007 Plan was 560,000 shares. The number of shares of common stock available for issuance under the 2007 Plan automatically increased on January 1, 2008 and 2009, by an amount equal to two percent (2%) of the total number of shares of common stock outstanding on the last trading day of December in the prior calendar year. After January 1, 2009, no new additional shares will be added to the 2007 Plan without stockholder approval (except for shares subject to outstanding awards that are forfeited or otherwise returned to the 2007 Plan). At December 31, 2013, there were no shares available for grant under the 2007 Plan.

The number of shares of Common Stock initially reserved for issuance under the 2013 Plan was 4,750,000 shares. No new additional shares will be added to the 2013 Plan without security holder approval (except for shares subject to outstanding awards that are forfeited or otherwise returned to the 2013 Plan). The stock issuable under the 2013 Plan shall be shares of authorized but unissued or reacquired Common Stock, including shares repurchased by the Company on the open market. At December 31, 2013, there were 4,280,000 shares available for grant under the 2013 Plan.

Upon the exercise of stock options, the granting of restricted stock, or the delivery of shares pursuant to vested restricted stock units, it is Acacia’s policy to issue new shares of common stock. Acacia’s board of directors may amend or modify the Plans at any time, subject to any required stockholder approval.  

The following table summarizes stock option activity for the Plans for the year ended December 31, 2013:

			Weighted-Average
	Options		Exercise Price		Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at December 31, 2012	313,000		$	5.87
Exercised	(115,000	)	$	4.22
Expired/forfeited	(3,000	)	$	1.85
Outstanding at December 31, 2013	195,000		$	6.91	1.6 years	$	1,485,000
Vested	195,000		$	6.91	1.6 years	$	1,485,000
Exercisable at December 31, 2013	195,000		$	6.91	1.6 years	$	1,485,000

The aggregate intrinsic value of options exercised during the years ended December 31, 2013, 2012 and 2011 was $2,024,000, $1,796,000, and $2,822,000, respectively. No options vested during the years ended December 31, 2013, 2012 and 2011.

The following table summarizes nonvested restricted share activity for the year ended December 31, 2013:

	Nonvested Restricted Shares		Weighted Average Grant Date Fair Value
Nonvested restricted stock at December 31, 2012	1,353,000		$	30.17
Granted	823,000		$	24.31
Vested	(813,000	)	$	27.45
Canceled	(126,000	)	$	28.48
Nonvested restricted stock at December 31, 2013	1,237,000		$	28.23

The weighted-average grant date fair value of nonvested restricted stock granted during the years ended December 31, 2013, 2012 and 2011 was $24.31, $32.17, and $29.24, respectively. The aggregate fair value of restricted stock that vested during the years ended December 31, 2013, 2012 and 2011 was $22,317,000, $28,865,000, $11,043,000, respectively. As of December 31, 2013, the total unrecognized compensation expense related to nonvested restricted stock awards was $25,915,000, which is expected to be recognized over a weighted-average period of approximately 1.8 years.

The following table summarizes restricted stock unit activity for the year ended December 31, 2013:

	Restricted Stock Units		Weighted Average Grant Date Fair Value
Nonvested restricted stock units outstanding at December 31, 2012	38,000		$	26.98
Granted	—		$	—
Vested	(18,000	)	$	26.05
Nonvested restricted stock units outstanding at December 31, 2013	20,000		$	27.83
Vested restricted stock units outstanding at December 31, 2013	94,000		$	13.05

The weighted-average grant date fair value of restricted stock units granted during the years ended December 31, 2012 and 2011 was $29.39 and $24.87, respectively.  There were $0 shares granted during the year ended December 31, 2013. The aggregate fair value of restricted stock units that vested during the years ended December 31, 2013, 2012 and 2011 was $469,000, $363,000 and $257,000, respectively. As of December 31, 2013, the total unrecognized compensation expense related to restricted stock unit awards was $480,000, which is expected to be recognized over a weighted-average period of approximately 1.6 years.

As of December 31, 2013, 4,280,000 shares of common stock are reserved for issuance under the Plans.