10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

______________________________________________________

FORM 10-Q

______________________________________________________

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

For the quarterly period ended March 31, 2016

OR

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

For the transition period from to .

Commission File Number: 001-33554

___________________________________________________

PROS HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

___________________________________________________

Delaware	76-0168604
(State of Incorporation)	(I.R.S. Employer Identification No.)

3100 Main Street, Suite 900 Houston TX	77002
(Address of Principal Executive Offices)	(Zip Code)
(713) 335-5151
(Registrant's telephone number, including area code)

____________________________________________________

(Former Name, Former Address and Former Fiscal Year, if changed Since Last Report)

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

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  x   No  o

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	x	Accelerated Filer	o
Non-Accelerated Filer	o (do not check if a smaller reporting company)	Smaller Reporting Company	o

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

The number of shares outstanding of the registrant's Common Stock, $0.001 par value, was 30,320,470 as of April 28, 2016.

PROS Holdings, Inc.

Form 10-Q

For the Quarterly Period Ended March 31, 2016

Table of Contents

		Page
PART I. FINANCIAL INFORMATION
Item 1.	Interim Condensed Consolidated Financial Statements (Unaudited)
	Condensed Consolidated Balance Sheets	4
	Condensed Consolidated Statements of Comprehensive Income (Loss)	5
	Condensed Consolidated Statements of Cash Flows	6
	Notes to Condensed Consolidated Financial Statements	7
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	17
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	25
Item 4.	Controls and Procedures	25
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	26
Item 1A.	Risk Factors	26
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	26
Item 3.	Defaults Upon Senior Securities	26
Item 4.	Mine Safety Disclosure	26
Item 5.	Other Information	26
Item 6.	Exhibits	26
Signatures		27

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements relate to future events or our future financial performance. These forward-looking statements regarding future events and our future results are based on current expectations, estimates, forecasts and projections, and the beliefs and assumptions of our management including, without limitation, our expectations regarding the following: our ability to execute on our revenue strategy shift to cloud-first, the license and subscription revenues generated by our software products and services; the impact of our revenue recognition policies; our belief that our current assets, including cash, cash equivalents, short-term investments, and expected cash flows from operating activities, will be sufficient to fund our operations; our belief that we will successfully integrate our acquisitions; our anticipated additions to property, plant and equipment; our belief that our facilities are suitable and adequate to meet our current operating needs; and our belief that we do not have any material exposure to changes in the fair value of our investment portfolio as a result of changes in foreign currency exchange rates or interest rates. Words such as, but not limited to, “we expect,” “anticipate,” “target,” “project,” “believe,” “goals,” “estimate,” “potential,” “predict,” “may,” “might,” “could,” “would,” “intend,” and variations of these types of words and similar expressions are intended to identify these forward-looking statements.

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PART I. Financial Information

ITEM 1. INTERIM CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

PROS Holdings, Inc.

Condensed Consolidated Balance Sheets

(In thousands, except share and per share amounts)

(Unaudited)

	March 31, 2016			December 31, 2015
Assets:
Current assets:
Cash and cash equivalents	$	118,700		$	161,770
Short-term investments	34,951			2,500
Accounts and unbilled receivables, net of allowance of $490 and $586, respectively	37,985			39,115
Prepaid and other current assets	6,203			7,540
Total current assets	197,839			210,925
Property and equipment, net	15,278			15,777
Intangibles, net	13,714			14,191
Goodwill	20,847			20,445
Other long-term assets	2,705			1,873
Total assets	$	250,383		$	263,211
Liabilities and Stockholders' Equity:
Current liabilities:
Accounts payable and other liabilities	$	6,679		$	8,273
Accrued liabilities	5,360			4,333
Accrued payroll and other employee benefits	9,847			13,084
Deferred revenue	69,755			60,664
Total current liabilities	91,641			86,354
Long-term deferred revenue	3,621			4,665
Convertible debt, net	117,428			115,860
Other long-term liabilities	938			918
Total liabilities	213,628			207,797
Commitments and contingencies (Note 6)
Stockholders' equity:
Preferred stock, $0.001 par value, 5,000,000 shares authorized; none issued	—			—
Common stock, $0.001 par value, 75,000,000 shares authorized; 34,737,801 and 34,156,561 shares issued, respectively; 30,320,216 and 29,738,976 shares outstanding, respectively	35			34
Additional paid-in capital	159,730			158,674
Treasury stock, 4,417,585 common shares, at cost	(13,938		)	(13,938		)
Accumulated deficit	(105,511		)	(85,034		)
Accumulated other comprehensive loss	(3,561		)	(4,322		)
Total stockholders' equity	36,755			55,414
Total liabilities and stockholders' equity	$	250,383		$	263,211

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

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PROS Holdings, Inc.

Condensed Consolidated Statements of Comprehensive Income (Loss)

(In thousands, except per share data)

(Unaudited) 

	Three Months Ended March 31,
	2016			2015
Revenue:
License	$	3,302		$	11,192
Services	9,763			9,631
Subscription	8,201			7,300
Total license, services and subscription	21,266			28,123
Maintenance and support	16,662			15,556
Total revenue	37,928			43,679
Cost of revenue:
License	62			50
Services	8,931			8,939
Subscription	3,446			3,075
Total license, services and subscription	12,439			12,064
Maintenance and support	3,272			2,937
Total cost of revenue	15,711			15,001
Gross profit	22,217			28,678
Operating expenses:
Selling and marketing	18,018			18,193
General and administrative	9,041			10,598
Research and development	13,132			11,610
Loss from operations	(17,974		)	(11,723		)
Convertible debt interest and amortization	(2,287		)	(2,185		)
Other expense, net	(58		)	(212		)
Loss before income tax provision	(20,319		)	(14,120		)
Income tax provision	158			110
Net loss	(20,477		)	(14,230		)
Net loss per share:
Basic	$	(0.68	)	$	(0.48	)
Diluted	$	(0.68	)	$	(0.48	)
Weighted average number of shares:
Basic	30,226			29,375
Diluted	30,226			29,375
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	756			(2,556		)
Unrealized gain on available-for-sale securities	5			—
Other comprehensive income (loss), net of tax	761			(2,556		)
Comprehensive loss	$	(19,716	)	$	(16,786	)

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

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PROS Holdings, Inc.

Condensed Consolidated Statements of Cash Flows

(In thousands)

(Unaudited) 

	Three Months Ended March 31,
	2016			2015
Operating activities:
Net loss	$	(20,477	)	$	(14,230	)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	2,465			2,395
Amortization of debt discount and issuance costs	1,568			1,466
Share-based compensation	5,384			7,745
Deferred income tax, net	27			—
Provision for doubtful accounts	(96		)	(154		)
Changes in operating assets and liabilities:
Accounts and unbilled receivables	1,257			13,065
Prepaid expenses and other assets	458			754
Accounts payable and other liabilities	801			(1,918		)
Accrued liabilities	1,034			474
Accrued payroll and other employee benefits	(3,203		)	(9,304		)
Deferred revenue	8,018			(1,727		)
Net cash used in operating activities	(2,764		)	(1,434		)
Investing activities:
Purchases of property and equipment	(3,522		)	(1,110		)
Capitalized internal-use software development costs	—			(118		)
Purchases of short-term investments	(34,946		)	(12,487		)
Proceeds from maturities of short-term investments	2,500			—
Net cash used in investing activities	(35,968		)	(13,715		)
Financing activities:
Exercise of stock options	—			256
Proceeds from employee stock plans	470			382
Tax withholding related to net share settlement of stock awards	(4,797		)	(4,319		)
Payments of notes payable	(38		)	(107		)
Debt issuance costs related to convertible debt	—			(408		)
Net cash used in financing activities	(4,365		)	(4,196		)
Effect of foreign currency rates on cash	27			(14		)
Net change in cash and cash equivalents	(43,070		)	(19,359		)
Cash and cash equivalents:
Beginning of period	161,770			161,019
End of period	$	118,700		$	141,660

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

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PROS Holdings, Inc.

Notes to Condensed Consolidated Financial Statements

(Unaudited)

1. Organization and Nature of Operations

PROS Holdings, Inc., a Delaware corporation, through its operating subsidiaries (collectively, the "Company"), provides enterprise revenue and profit realization software solutions designed to help companies accelerate sales, formulate winning pricing strategies and align product, demand and availability. The Company's revenue and profit realization solutions are designed to assist customers in growing revenue, supporting sustained profitability and modernizing their business processes. The Company provides its solutions to enterprises across a range of industries, including manufacturing, distribution, services, and travel. The Company offers its solutions via a SaaS delivery model as well as on a perpetual or term license basis. The Company also provides professional services to implement its software applications as well as business consulting. In addition, the Company provides product maintenance and support to its customers through which they receive unspecified upgrades, maintenance releases and bug fixes during the term of the support period on a when-and-if-available basis.

2. Summary of Significant Accounting Policies

The accompanying unaudited condensed consolidated financial statements reflect the application of significant accounting policies as described below and elsewhere in these notes to the condensed consolidated financial statements.

Basis of presentation

The accompanying unaudited condensed consolidated financial statements of the Company have been prepared in accordance with generally accepted accounting principles in the United States ("GAAP") for interim financial reporting and applicable quarterly reporting regulations of the Securities and Exchange Commission ("SEC"). In management's opinion, the accompanying interim unaudited condensed consolidated financial statements include all adjustments necessary for a fair statement of the financial position of the Company as of March 31, 2016, the results of operations for the three months ended March 31, 2016 and 2015, and cash flows for the three months ended March 31, 2016 and 2015.

Certain information and disclosures normally included in the notes to the annual financial statements prepared in accordance with GAAP have been omitted from these interim unaudited condensed consolidated financial statements pursuant to the rules and regulations of the SEC. Accordingly, these unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2015 ("Annual Report") filed with the SEC. The condensed consolidated balance sheet as of December 31, 2015 was derived from the Company's audited consolidated financial statements but does not include all disclosures required under GAAP.

Basis of consolidation

The unaudited condensed consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. The functional currency of PROS France SAS, formerly known as Cameleon Software SA ("PROS France") is the Euro. The financial statements of this subsidiary are translated into U.S. dollars using period-end rates of exchange for assets and liabilities, historical rates of exchange for equity, and average rates of exchange for the period for revenue and expenses. Translation gains (losses) are recorded in accumulated other comprehensive loss as a component of stockholders' equity.

Dollar amounts

The dollar amounts presented in the tabular data within these footnote disclosures are stated in thousands of dollars, except per share amounts, or as noted within the context of each footnote disclosure.

Use of estimates

The Company makes estimates and assumptions in the preparation of its unaudited condensed consolidated financial statements, and its estimates and assumptions may affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated financial statements, and the reported amounts of revenue and expenses during the reporting periods. Actual results could differ from those estimates. The complexity and judgment required in the Company's estimation process, as well as issues related to the assumptions, risks and uncertainties inherent in the

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application of the percentage-of-completion method of accounting, affect the amounts of revenue, expenses, unbilled receivables and deferred revenue. Estimates are also used for, but not limited to, receivables, allowance for doubtful accounts, useful lives of assets, depreciation and amortization, income taxes and deferred tax asset valuation, valuation of stock options, other current liabilities and accrued liabilities. Numerous internal and external factors can affect estimates. The critical accounting policies related to the estimates and judgments are discussed in the Company's Annual Report under management's discussion and analysis of financial condition and results of operations. There have been no significant changes to the Company's critical accounting policies as described in the Company's Annual Report.

Revenue recognition

The Company has historically derived its revenue from the licensing and implementation of software solutions and associated software maintenance and support. More recently, the Company has emphasized its offers SaaS and cloud-based services that do not require customers to host the Company's solutions in their data centers. The Company's arrangements with customers typically include: (a) license or SaaS fees paid for the use of software solutions either in perpetuity or over a specified term and implementation fees for configuration, implementation and training services and (b) maintenance and support fees related to technical support and software updates. If there is significant uncertainty about contract completion or collectability is not reasonably assured, revenue is deferred until the uncertainty is sufficiently resolved or collectability is reasonably assured. In addition, revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred and fees are fixed or determinable.

License

The Company derives the majority of its license revenue from the sale of perpetual licenses. For software license arrangements that do not require significant modification or customization of the underlying software, the Company recognizes software licenses revenues at contract provided that professional services are not considered essential to the delivery of the software and when: (1) the Company enters into a legally binding arrangement with a customer for the license of software; (2) the Company delivers the products; (3) the sale price is fixed or determinable and free of contingencies or significant uncertainties; and (4) collection is probable. Revenues that are not recognized at the time of sale because the foregoing conditions are not met, are recognized when those conditions are subsequently met.

The Company evaluates the nature and scope of professional services for each arrangement, and if it determines that the professional services revenue should not be accounted for separately from license revenue, the license revenue is recognized together with the professional services revenue using the percentage-of-completion method or completed contract method. The completed contract method is also used for contracts where there is a risk over final acceptance by the customer or for contracts that are short-term in nature.

The percentage-of-completion method is measured by the percentage of man-days incurred during the reporting period as compared to the estimated total man-days necessary for each contract for implementation of the software solutions. The Company believes that for each such project, man-days expended in proportion to total estimated man-days at completion represents the most reliable and meaningful measure for determining a project's progress toward completion. Under the Company's fixed-fee arrangements, should a loss be anticipated on a contract, the full amount of the loss is recorded when the loss is determinable.

The Company also licenses software solutions under term license agreements that typically include maintenance during the license term. When maintenance is included for the entire term of the term license, there is no renewal rate and the Company has not established vendor specific objective evidence ("VSOE") of fair value for the maintenance on term licenses. For term license agreements, revenue and the associated costs are deferred until the delivery of the solution and recognized ratably over the remaining license term.

Professional Services

In determining whether professional services revenue should be accounted for separately from license revenue, the Companyevaluates whether the professional services are considered essential to the functionality of the software using factors such as: the nature of its software products; whether they are ready for use by the customer upon receipt; the nature of professional services; the availability of services from other vendors; whether the timing of payments for license revenue coincides with performance of services; and whether milestones or acceptance criteria exist that affect the realizability of the software license fee.

If the Company determines that professional services revenue should not be accounted for separately from license revenue, the license revenue is recognized together with the professional services revenue using the percentage-of-completion method or

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completed contract method. The completed contract method is also used for contracts where there is a risk over final acceptance by the customer or for contracts that are short-term in nature.

For SaaS or cloud based services arrangements that include professional services, the Company determines whether the professional services have stand-alone value. If the Company determines the professional services do not have stand-alone value, the Company treats the transaction as a single element, the professional services revenue is deferred until the customer commences use of the SaaS or cloud-based services, and the professional services revenue is recognized over the remaining term of the arrangement.

SaaS or Cloud-Based Services

For arrangements that include SaaS or cloud-based services, the Company allocates the arrangement consideration between the service and other elements and recognizes the SaaS or cloud-based services fee ratably beginning on the date the customer commences use of those services and continues through the end of the service term. Any revenue related to up-front activation or set-up fees are deferred and recognized ratably over the estimated period that the customer benefits from the related services. Direct and incremental costs related to up-front activation or set-up activities are capitalized until the date the Company's service is made available and then expensed ratably over the estimated period that the customer benefits from the related services.

Multiple Element Arrangements

The Company applies the residual method to recognize revenue for the delivered elements in stand-alone software transactions. Under the residual method, the amount of revenue allocated to delivered elements equals the total arrangement consideration, less the aggregate fair value of any undelivered elements, typically maintenance, provided that VSOE of fair value exists for all undelivered elements. VSOE of fair value is based on the price charged when the element is sold separately or, in the case of maintenance, substantive renewal rates for maintenance.

For multiple element arrangements containing both software and nonsoftware services, the Company must (1) determine whether and when each element has been delivered; (2) determine fair value of each element using the selling price hierarchy of VSOE of fair value, third party evidence ("TPE"), or best estimate of selling price ("BESP"), as applicable; and (3) allocate the total price among the various elements based on the relative selling price method.

For multiple-element arrangements that contain software and nonsoftware elements such as the Company's cloud-based service solutions, the Company allocates revenue between the software and software related elements as a group and any nonsoftware elements based on a relative fair value allocation. The Company determines fair value for each deliverable using the selling price hierarchy described above and utilizes VSOE of fair value if it exists.

In certain instances, the Company may not be able to establish VSOE for all deliverables in an arrangement with multiple elements. This may be due to infrequently selling each element separately, not pricing solutions or services within a narrow range, or only having a limited sales history. In addition, third party evidence may not be available. When the Company is unable to establish selling prices using VSOE or TPE, it uses BESP in the allocation of arrangement consideration. The objective of BESP is to determine the price at which the Company would transact a sale if the product or service were sold on a stand-alone basis. For transactions that only include software and software-related elements, the Company continues to account for such arrangements under the software revenue recognition standards which require it to establish VSOE of fair value to allocate arrangement consideration to multiple deliverables.

Maintenance and Support

Maintenance and support revenue includes post-implementation customer support and the right to unspecified software updates and enhancements on a when and if available basis. The Company recognizes revenue from maintenance arrangements ratably over the period in which the services are provided.

Revenue that has been recognized, but for which the Company has not invoiced the customer, is recorded as unbilled receivables. Invoices that have been issued before revenue has been recognized are recorded as deferred revenue in the accompanying consolidated balance sheets.

Internal-use software

Costs incurred to develop internal-use software during the development stage are capitalized, stated at cost, and depreciated using the straight-line method over the estimated useful lives of the assets. Development stage costs generally include salaries and

9

personnel costs and third-party contractor expenses associated with internal-use software configuration, coding, installation and testing. For the three months ended March 31, 2016 and 2015, the Company capitalized zero and $0.1 million, respectively, of internal-use software development costs related to cloud-based offerings. Capitalized internal-use software development costs related to cloud-based offerings are amortized using the straight-line method over the useful life of the asset. For the three months ended March 31, 2016 and 2015, the Company amortized no capitalized internal-use software development costs. Capitalized software for internal use is included in property and equipment, net in the unaudited condensed consolidated balance sheets. Amortization of capitalized internal-use software development costs, if any, is included in cost of subscription revenues in the accompanying unaudited condensed consolidated statements of comprehensive income (loss).

Impairment of long-lived assets

Long-lived assets are reviewed for impairment whenever an event or change in circumstances indicates that the carrying amount of an asset or group of assets may not be recoverable. The impairment review includes comparison of future cash flows expected to be generated by the asset or group of assets with the associated assets' carrying value. If the carrying value of the asset or group of assets exceeds its expected future cash flows (undiscounted and without interest charges), an impairment loss is recognized to the extent that the carrying amount of the asset exceeds its fair value. The Company recorded no impairment charges during the three months ended March 31, 2016 and 2015.

Noncash share-based compensation

The Company measures all share-based payments to its employees based on the grant date fair value of the awards and recognizes expenses in the Company's unaudited consolidated statement of comprehensive income (loss) on a straight-line basis over the periods during which the recipient is required to perform services (generally over the vesting period of the awards). To date, the Company has granted stock options, Restricted Stock Units ("RSUs"), stock settled Stock Appreciation Rights ("SARs"), and Market Stock Units ("MSUs"). RSUs include both time-based awards as well as performance-based awards in which the number of shares that vest upon satisfying certain conditions from binding customer agreements for the provision of configure, price, and quote ("CPQ") solutions. MSUs are performance-based awards in which the number of shares that vest are based upon the Company's relative stockholder return.

The following table presents the number of shares or units outstanding for each award type as of March 31, 2016 and December 31, 2015, respectively, (in thousands):

Award type	March 31, 2016	December 31, 2015
Stock options	829	829
Restricted stock units (time based)	1,752	1,915
Restricted stock units (performance based)	—	24
Stock appreciation rights	522	522
Market stock units	464	563

Stock options, time based RSUs and SARs vest ratably between one and four years. The actual number of MSUs that will be eligible to vest is based on the total stockholder return of the Company relative to the total stockholder return of the Russell 2000 Index ("Index") over their respective performance periods, as defined by each award's plan documents. The Company did not grant any stock options or SARs during the three months ended March 31, 2016 and 2015.

The fair value of the RSUs is based on the closing price of the Company's stock on the date of grant.

The Company estimates the fair value of MSUs on the date of grant using a Monte Carlo simulation model. The determination of fair value of the MSUs is affected by the Company's stock price and a number of assumptions including the expected volatilities of the Company's stock and the Index, its risk-free interest rate and expected dividends. The Company's expected volatility at the date of grant was based on the historical volatilities of the Company and the Index over the performance period.

The weighted average assumptions used to value the MSUs granted during the three months ended March 31, 2016 were as follows:

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	March 31, 2016
Volatility	44.06%
Risk-free interest rate	1.04%
Expected option life in years	2.93
Dividend yield	—

Earnings per share

The Company computes basic earnings (loss) per share by dividing net income (loss) attributable to common stockholders by the weighted average number of common shares outstanding. Diluted earnings (loss) per share is computed by dividing net income (loss) attributable to common stockholders by the weighted average number of common shares and dilutive potential common shares then outstanding. Diluted earnings per share reflect the assumed conversion of all dilutive securities, using the treasury stock method. Dilutive potential common shares consist of shares issuable upon the exercise of stock options, shares of unvested restricted stock units, and settlement of stock appreciation rights. When the Company incurs a net loss, the effect of the Company's outstanding stock options, stock appreciation rights and restricted stock units are not included in the calculation of diluted earnings (loss) per share as the effect would be anti-dilutive. Accordingly, basic and diluted net loss per share are identical.

Short-term investments

The Company's investments are available-for-sale commercial paper that are recorded at fair value in the consolidated balance sheets. Unrealized gains and losses on available-for-sale securities are recorded, net of tax, as a component of accumulated other comprehensive income (loss), unless impairment is considered to be other-than-temporary. Other-than-temporary unrealized losses on available-for-sale securities are generally recorded in gain (loss) on investments, net, in the consolidated statements of comprehensive income (loss) unless certain criteria are met. The primary factors considered when determining if a charge must be recorded because a decline in the fair value of an investment is other-than-temporary include whether: (i) the fair value of the investment is significantly below the Company's cost basis; (ii) the financial condition of the issuer of the security has deteriorated; (iii) if a debt security, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the security; (iv) the decline in fair value has existed for an extended period of time; (v) if a debt security, such security has been downgraded by a rating agency; and (vi) the Company has the intent and ability to retain the investment for a period of time sufficient to allow for any anticipated recovery in fair value. Investments with remaining maturities of twelve months or less are classified as short-term investments since they are readily convertible to cash to fund short-term operations. Investments with remaining maturities of more than twelve months are classified as long-term investments. All of the Company's investments had contractual maturities of less than twelve months as of March 31, 2016.

Fair value measurement

The Company's financial assets that are measured at fair value on a recurring basis consisted of $95.3 million and $127.2 million invested in treasury money market funds at March 31, 2016 and December 31, 2015, respectively. The fair value of these accounts is determined based on quoted market prices, which represents level 1 in the fair value hierarchy as defined by Accounting Standard Codification ("ASC") 820, "Fair Value Measurement and Disclosure."

The fair value of the Company's short-term investments which is comprised of available-for-sale commercial paper was $35.0 million and $2.5 million as of March 31, 2016 and December 31, 2015, respectively. The fair value of these accounts is determined based on quoted market prices for similar assets in active markets, which represents level 2 in the fair value hierarchy. The Company recorded an immaterial amount of unrealized gain related to the short-term investments for the three months ended March 31, 2016 and 2015. Reclassification adjustments for realized gain (loss) on available-for-sale securities in net income were immaterial for the three months ended March 31, 2016 and 2015.

Deferred revenue and unbilled receivables

Software license and implementation services that have been performed, but for which the Company has not invoiced the customer, are recorded as unbilled receivables, and invoices that have been issued before the software license and implementation, maintenance and subscription services have been performed are recorded as deferred revenue in the accompanying unaudited condensed consolidated balance sheets.

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Credit facility

As of March 31, 2016, the Company had no outstanding borrowings under the Company's $50 million secured Credit Agreement ("Revolver"), and $0.1 million of unamortized debt issuance costs related to the Revolver is included in other long-term assets in the condensed consolidated balance sheets. For the three months ended March 31, 2016 and 2015, the Company recorded an immaterial amount of amortization of debt issuance cost which is included in other expense, net in the unaudited condensed consolidated statements of comprehensive income (loss).

Income taxes

The Company recorded an income tax provision of $0.2 million and $0.1 million for the three months ended March 31, 2016 and 2015, respectively, primarily related to foreign income taxes and state taxes not based on income. The effective tax rate for the three months ended March 31, 2016 and 2015 was (1)%. The income tax rates vary from the federal and state statutory rates primarily due to the valuation allowances on the Company’s deferred tax assets, the limitation on deductibility of certain officers’ compensation, and foreign and state taxes not based on income. The Company estimates its annual effective tax rate at the end of each quarterly period. Jurisdictions with a projected loss for the year where no tax benefit can be recognized due to the valuation allowances on the Company’s deferred tax assets are excluded from the estimated annual effective tax rate. The impact of such an exclusion could result in a higher or lower effective tax rate during a particular quarter depending on the mix and timing of actual earnings versus annual projections.

Recently adopted accounting pronouncements

In April 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2015-03, "Simplifying the Presentations of Debt Issuance Costs", which requires debt issuance cost to be presented in the balance sheet as a direct deduction from the carrying value of the associated debt liability, consistent with the presentation of a debt discount. In August 2015, the FASB issued ASU 2015-15, "Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements", which provides clarification regarding costs to secure revolving lines of credit, which are, at the outset, not associated with an outstanding borrowing. ASU 2015-15 provides commentary that the SEC staff would not object to an entity deferring and presenting costs associated with line-of-credit arrangements as an asset and subsequently amortizing them ratably over the term of the revolving debt arrangement. These new standards are effective for interim and annual periods beginning on January 1, 2016, and are required to be retrospectively adopted. The Company adopted these standards on January 1, 2016. As of December 31, 2015, $0.1 million and $0.4 million of unamortized debt issuance costs related to the Company’s convertible Senior Notes were reclassified in the condensed consolidated balance sheet from prepaid and other current assets and other long-term assets, respectively, to convertible debt, net. The Company will continue to defer and present the debt issuance cost related to its revolving credit facility in other long-term assets and amortize it ratably over the term of the agreement.

In April 2015, the FASB issued ASU 2015-05, “Intangibles - Goodwill and Other Internal-Use Software”. The amendments in this update provide guidance to customers about whether a cloud computing arrangement includes a software license, and if so, how the software license element of the arrangement should be accounted for by the customer. The new standard will be effective for annual period ending after December 15, 2015, and all reporting periods thereafter. The Company adopted this standard on January 1, 2016, and there was no impact on the Company's consolidated financial statements.

Recent accounting pronouncements

In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)," which supersedes nearly all existing revenue recognition guidance under GAAP and permits the use of either the retrospective or cumulative effect transition method. In August 2015, the FASB issued ASU 2015-14, "Revenue from Contracts with Customers: Deferral of the Effective Date", which deferred the effective date of the new revenue standard for periods beginning after December 15, 2016 to December 15, 2017, with early adoption permitted but not earlier than the original effective date. In March 2016, the FASB issued ASU 2016-08, “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations”, which clarifies the implementation of guidance on principal versus agent considerations. In April 2016, the FASB issued ASU 2016-10, "Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligation and Licensing", which clarifies the implementation of guidance on identifying performance obligations and licensing. These standards are effective for the Company in the first quarter of fiscal 2018. The Company has not yet selected a transition method and is currently evaluating the effect that the updated standards will have on the Company's consolidated financial statements and related disclosures.

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)”, which requires the lessee to recognize most leases on the balance sheet thereby resulting in the recognition of lease assets and liabilities for those leases currently classified as operating leases. Lessor accounting remains largely unchanged from current guidance, however, ASU 2016-02 provides

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improvements that are intended to align lessor accounting with the lessee model and with updated revenue recognition guidance. This standard is effective for interim and annual reporting periods beginning after December 15, 2018. The Company is currently assessing the impact of ASU 2016-02 on its condensed consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, “Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting”, which is intended to simplify several aspects of the accounting for share-based payment transactions including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. This standard is effective for interim and annual reporting periods beginning after December 15, 2016. The Company is currently assessing the impact of ASU 2016-09 on its condensed consolidated financial statements.

With the exception of the new standards discussed above, there have been no other recent accounting pronouncements or changes in accounting pronouncements during the three months ended March 31, 2016, as compared to the recent accounting pronouncements described in the Company's Annual Report, that are of significance or potential significance to the Company.

3. Earnings per Share

The following table sets forth the computation of basic and diluted earnings per share for the three months ended March 31, 2016 and 2015:

	Three Months Ended March 31,
(in thousands, except per share data)	2016			2015
Numerator:
Net loss	$	(20,477	)	$	(14,230	)
Denominator:
Weighted average shares (basic)	30,226			29,375
Dilutive effect of potential common shares	—			—
Weighted average shares (diluted)	30,226			29,375
Basic loss per share	$	(0.68	)	$	(0.48	)
Diluted loss per share	$	(0.68	)	$	(0.48	)

Dilutive potential common shares consist of shares issuable upon the exercise of stock options, settlement of SARs, and the vesting of RSUs and MSUs. Potential common shares determined to be antidilutive and excluded from diluted weighted average shares outstanding were approximately 2.0 million and 2.2 million for the three months ended March 31, 2016 and 2015, respectively. Basic shares were used to calculate loss per share for the three months ended March 31, 2016 and 2015.

Since the Company has the intention and ability to settle the principal amount of its Senior Notes (see Note 5) in cash, the treasury stock method is expected to be used for calculating any potential dilutive effect of the conversion spread on diluted net income per share, if applicable. The conversion spread will have a dilutive impact on diluted net income per share of common stock when the average market price of common stock for a given period exceeds the conversion price of $33.79 per share.

4. Noncash Share-based Compensation

During the three months ended March 31, 2016, the Company granted 552,382 RSUs with a weighted average grant-date fair value of $11.71 per share. The Company granted 152,500 MSUs with a weighted average grant-date fair value of $14.29 to certain executive employees during the three months ended March 31, 2016. These MSUs vest on March 1, 2019 and the actual number of MSUs that will be eligible to vest is based on the total stockholder return of the Company relative to the total stockholder return of the Index over the Performance Period, as defined by each award's plan documents or individual award agreements. The Company did not grant any stock options or SARs during the three months ended March 31, 2016.

Share-based compensation expense is allocated to expense categories on the unaudited condensed consolidated statements of comprehensive income (loss). The following table summarizes share-based compensation expense included in the Company's unaudited condensed consolidated statements of comprehensive income (loss) for the three months ended March 31, 2016 and 2015:

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	Three Months Ended March 31,
	2016		2015
Share-based compensation:
Cost of revenue	$	599	$	1,013
Operating expenses:
Selling and marketing	1,780		2,032
General and administrative	1,730		3,348
Research and development	1,275		1,352
Total included in operating expenses	4,785		6,732
Total share-based compensation expense	$	5,384	$	7,745

In January 2016, the number of shares available for issuance increased by 900,000 to 9,968,000 under an evergreen provision in the Company's 2007 Equity Incentive Plan ("2007 Stock Plan"). As of March 31, 2016, 1,749,726 shares remained available for issuance under the 2007 Stock Plan.

At March 31, 2016, the Company had an estimated $41.9 million of total unrecognized compensation costs related to share-based compensation arrangements. These costs will be recognized over a weighted average period of 2.4 years.

In June 2013, the Board of Directors authorized an Employee Stock Purchase Plan ("ESPP") which provides for eligible employees to purchase shares on an after-tax basis in an amount between 1% and 10% of their annual pay: (i) on June 30 of each year at a 5% discount of the fair market value of the Company's common stock on January 1 or June 30, whichever is lower, and (ii) on December 31 of each year at a 5% discount of the fair market value of the Company's common stock on July 1 or December 31, whichever is lower. An employee may not purchase more than $5,000 in either of the six-month measurement periods described above or more than $10,000 annually. In November 2015, the Board of Directors amended the ESPP plan to increase the discount to 15% of the fair market value of the Company's common stock effective January 1, 2016. The amendment did not change the accounting treatment of the ESPP plan. During the quarter ended March 31, 2016, the Company issued 23,848 shares under the ESPP. As of March 31, 2016, 425,155 shares remain authorized and available for issuance under the ESPP. As of March 31, 2016, the Company held approximately $0.4 million on behalf of employees for future purchases under the ESPP, and this amount was recorded in accrued liabilities in the Company's unaudited condensed consolidated balance sheet.

5. Convertible Senior Notes

2.0% Convertible Senior Notes Due December 1, 2019

In December 2014, the Company issued $143.8 million aggregate principal amount of 2% convertible Senior Notes (the "Senior Notes") due December 1, 2019, unless earlier purchased by the Company or converted. Interest is payable semiannually in arrears on June 1 and December 1 of each year, commencing on June 1, 2015.

The Senior Notes are governed by an Indenture between the Company, as issuer, and Wilmington Trust, National Association, as trustee. The Senior Notes are the Company's general unsecured obligations and will rank senior in right of payment to all of the Company's indebtedness that is expressly subordinated in right of payment to the Senior Notes, will rank equally in right of payment with all of Company's existing and future liabilities that are not so subordinated, will be effectively junior to any of the Company's secured indebtedness to the extent of the value of the assets securing such indebtedness and will be structurally subordinated to all indebtedness and other liabilities (including trade payables but excluding intercompany obligations owed to the Company or its subsidiaries).

Upon conversion of the Senior Notes, the Company will pay or deliver, as the case may be, cash, shares of the Company's common stock or a combination of cash and shares of common stock, at the Company's election.

The initial conversion rate for the Senior Notes will be 29.5972 shares of common stock per $1,000 in principal amount of Senior Notes, equivalent to a conversion price of approximately $33.79 per share of common stock. Throughout the term of the Senior Notes, the conversion rate may be adjusted upon the occurrence of certain events. Holders of the Senior Notes will not receive any cash payment representing accrued and unpaid interest upon conversion. Accrued but unpaid interest will be deemed to be paid in full upon conversion rather than canceled, extinguished or forfeited. Holders may convert their Senior Notes at their option at any time prior to the close of business on the business day immediately preceding September 1, 2019 only under the following circumstances:

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• during any calendar quarter commencing after the calendar quarter ending on March 31, 2015, if the last reported sale price of the common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day;

• during the five consecutive business day period immediately following any five consecutive trading day period in which the trading price per $1,000 principal amount of Senior Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company's common stock and the conversion rate on each such trading day; or

• upon the occurrence of specified corporate events.

On or after September 1, 2019 to the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their Senior Notes regardless of the above. Upon conversion, the Company will pay or deliver cash, shares of its common stock or a combination of cash and shares of its common stock, at its election, as described in the indenture.

As of March 31, 2016, the Senior Notes are not yet convertible.

In accounting for the issuance of the Senior Notes, the Company separated the Senior Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the face value of the Senior Notes as a whole. The excess of the principal amount of the liability component over its carrying amount ("debt discount") is amortized to interest expense over the term of the Senior Notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification.

In accounting for the transaction costs related to the Senior Notes issuance, the Company allocated the total amount incurred to the liability and equity components based on their relative values. Issuance costs attributable to the liability component, totaling $4.3 million, are being amortized to expense over the term of the Senior Notes using the effective interest method, and issuance costs attributable to the equity component, totaling $1.2 million, were netted with the equity component in stockholders' equity. Additionally, the Company recorded an immaterial deferred tax asset on a portion of the equity component transaction costs which are deductible for tax purposes.

The Senior Notes consist of the following (in thousands):

	March 31, 2016			December 31, 2015
Liability component:
Principal	$	143,750		$	143,750
Less: debt discount and issuance cost, net of amortization	(26,322		)	(27,890		)
Net carrying amount	$	117,428		$	115,860
Equity component (1)	$	28,714		$	28,714

(1) Recorded in the consolidated balance sheet within additional paid-in capital, net of $1.2 million issuance cost in equity.

The following table sets forth total interest expense recognized related to the Senior Notes (in thousands):

	Three Months Ended March 31,
	2016		2015
2.0% coupon	$	719	$	719
Amortization of debt issuance costs	204		195
Amortization of debt discount	1,364		1,271
Total	$	2,287	$	2,185

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As of March 31, 2016 and December 31, 2015, the fair value of the Senior Notes was $90.3 million and $114.1 million, respectively. The fair value was determined based on inputs that are observable in the market or that could be derived from, or corroborated with, observable market data, including the Company's stock price, interest rates and carrying value of the debt instrument (carrying value excludes the equity component of the Company's convertible notes classified in equity), which represents level 2 in the fair value hierarchy.

Note Hedge

To minimize the impact of potential economic dilution upon conversion of the Senior Notes, the Company entered into convertible note hedge transactions with respect to its common stock (the "Note Hedge"). In December 2014, the Company paid an aggregate amount of $29.4 million for the Note Hedge. The Note Hedge will expire upon maturity of the Senior Notes. The Note Hedge is intended to offset the potential dilution upon conversion of the Senior Notes and/or offset any cash payments the Company is required to make in excess of the principal amount upon conversion of the Senior Notes in the event that the market value per share of the Company's common stock, as measured under the Senior Notes, is greater than the strike price of the Note Hedge, which initially corresponds to the conversion price of the Notes and is subject to anti-dilution adjustments substantially similar to those applicable to the conversion rate of the Senior Notes. The Note Hedge is a separate transaction, entered into by the Company and is not part of the Senior Notes or the Warrant, and has been accounted for as part of additional paid-in capital.

Warrant

Separately, in December 2014, the Company entered into warrant transactions (the "Warrant"), whereby the Company sold warrants to acquire shares of the Company's common stock at a strike price of $45.48 per share. The Company received aggregate proceeds of $17.1 million from the sale of the Warrant. If the average market value per share of the Company's common stock for the reporting period, as measured under the Warrant, exceeds the strike price of the Warrant, the Warrant will have a dilutive effect on the Company's earnings per share. The Warrant is a separate transaction, entered into by the Company and is not part of the Senior Notes or the Note Hedge, and has been accounted for as part of additional paid-in capital. Holders of the Senior Notes and Note Hedge will not have any rights with respect to the Warrant.

6. Commitments and Contingencies

Litigation

In the ordinary course of business, the Company regularly becomes involved in contract and other negotiations and, in more limited circumstances, becomes involved in legal proceedings, claims and litigation. The outcomes of these matters are inherently unpredictable. The Company is not currently involved in any outstanding litigation that it believes, individually or in the aggregate, will have a material adverse effect on its business, financial condition, results of operations or cash flows.

Lease commitments

The Company leases office space and office equipment under noncancelable operating leases that expire at various dates. In January 2016, the Company entered into a nine year lease for approximately 5,000 square feet of office space in Paris, France. The lease provides an option to terminate the lease in March 2022. The lease is expected to be an operating lease.

As of March 31, 2016, the future minimum lease commitments related to lease agreements were as follows:

Year Ending December 31,	Amount
Remaining 2016	$	1,873
2017	1,381
2018	868
2019	788
2020	802
2021 and thereafter	400
Total minimum lease payments	$	6,112

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ITEM 2.MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The terms “we,” “us,” “PROS“ and “our” refer to PROS Holdings, Inc. and all of its subsidiaries that are consolidated in conformity with generally accepted accounting principles in the United States.

This management's discussion and analysis of financial condition and results of operations should be read along with the unaudited condensed consolidated financial statements and unaudited notes to condensed consolidated financial statements included in Item 1 of this Quarterly Report on Form 10-Q, as well as the audited consolidated financial statements and notes to consolidated financial statements and management's discussion and analysis of financial condition and results of operations set forth in our Annual Report.

Overview

PROS provides enterprise revenue and profit realization software solutions designed to help companies accelerate sales, formulate winning pricing strategies and align product, demand and availability. Our revenue and profit realization software solutions allow our customers to grow revenue, sustain profitability and modernize their business processes.

Q1 2016 Overview

In 2015, we shifted from primarily offering perpetual licenses of our solutions to a subscription based cloud-first strategy. As part of this shift, we introduced a number of changes to our business. In the first quarter of 2016, we continued to implement and refine these changes, including further innovation on our new cloud-only packages of our software, training our personnel, and focusing on competitive differentiation in key industry verticals, and opening our first office in Australia. As a result of these changes, we continued to progress our cloud-first strategy in the first quarter of 2016, as our recurring revenue, which consists of maintenance and subscription revenue, grew by 9% over the first quarter of 2015.

Annualized Recurring Revenue ("ARR") is currently one of our key performance metrics to assess the health and trajectory of our overall cloud business. ARR should be viewed independently of revenue, deferred revenue and any other GAAP measure as ARR is a performance metric and is not intended to be combined with any of these items. ARR is defined as the annualized contracted recurring revenue from subscription and maintenance contracts. Contracted revenue from perpetual license, term license and service agreements are not included within the ARR metric. Total ARR as of March 31, 2016 was $103.2 million, up from $84.9 million as of March 31, 2015, an increase of 22%.

Free cash flow is another one of our key metrics that assess the strength of our business. Free cash flow is a non-GAAP financial measure which is defined as net cash provided by operating activities, less additions to property, plant and equipment and capitalized internal-use software development costs. We believe free cash flow may be useful to investors and other users of our financial information in evaluating the amount of cash generated by business operations, after cash used for additions to property, plant and equipment and capitalized internal-use software development costs. Free cash flow use for the three months ended March 31, 2016 was $6.3 million, up from $2.7 million for the three months ended March 31, 2015.

Financial Performance Summary

Total revenue for the three months ended March 31, 2016, decreased $5.8 million to $37.9 million from $43.7 million for the three months ended March 31, 2015, representing a 13% decrease. This decrease in total revenue was primarily attributable to a decrease in license revenue, which was expected as we transition our business towards our subscription-based SaaS and cloud-based solutions.

Total recurring revenue, which is comprised of our subscription and maintenance revenue, was $24.9 million for the three months ended March 31, 2016 as compared to $22.9 million for the three months ended March 31, 2015, an increase of 9%, as a result of our transition towards our subscription-based SaaS and cloud-based solutions.

Total deferred revenue was $73.4 million as of March 31, 2016, as compared to $65.3 million as of March 31, 2015, an increase of $8.1 million, or 12%, primarily due to an increase in our subscription deferred revenue.

Cash used in operating activities was $2.8 million for the three months ended March 31, 2016, as compared to $1.4 million for the three months ended March 31, 2015, an increase of 93%, primarily due to an increase in net loss driven by our transition to a cloud-first strategy, partially offset by change in working capital.

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Revenue by Geography

The following geographic information is presented for the three months ended March 31, 2016 and 2015. PROS categorizes geographic revenues based on the location of the customer's headquarters.

	Three Months Ended March 31,
	2016				2015
	Revenue		Percent		Revenue		Revenue
United States of America	$	14,476	38	%	$	16,227	37	%
Europe	10,830		29	%	11,895		27	%
The rest of the world	12,622		33	%	15,557		36	%
Total revenue	$	37,928	100	%	$	43,679	100	%

Opportunities, Trends and Uncertainties

We have noted opportunities, trends and uncertainties that we believe are particularly significant to understand our financial results and condition.

• Cloud-first strategy. We have historically sold the majority of our products via perpetual licenses. We also sold our solutions via term licenses or SaaS. In connection with our subscription based cloud-first strategy announced in 2015, we expect to sell a lower percentage of perpetual licenses and more subscription-based solutions such as SaaS and subscription cloud-based solutions. Following a transition period, we expect this business model will increase our recurring subscription revenue and defer more of our revenue recognition to later periods. We anticipate that this strategy will result in lower license revenue, lower total revenues and lower operating cash flows in 2016. However, we do not anticipate a corresponding decrease in expenses in 2016, which will adversely affect our net income, operating margins and cash flow.

• Variability in bookings. Historically, we have experienced the strongest customer demand in fourth and second quarters of each year. However, the size and timing of orders for our products and services vary considerably, which can cause significant fluctuations in our bookings results from quarter to quarter. Due to our average deal sizes, our bookings in any particular quarter have in the past, and may continue in the future, to be dependent on a relatively small number of orders. While we did not experience any unanticipated sales execution challenges during the first quarter of 2016, during the last two quarters of 2015, we did experience sales execution challenges which we believe stemmed from the pace of change associated with our cloud-first strategy. The timing of our bookings also varies based on a number of factors over which we may have little or no control, including the complexity of the transaction, our customers' internal budgeting and approval processes, our customers purchasing behaviors and the level of competition.

• Variability in revenue. The timing of our revenue recognition varies based on the nature and requirements of our contracts.  In conjunction with our cloud-first announcement in 2015, we expect to have an increasing number of subscription contracts, which will result in less license revenue recognized in 2016. The timing of our revenue recognition for our SaaS solutions also varies based on the mix of products sold. For example, our SaaS solutions purchased by our travel customers often require more complex implementations which can delay the commencement of subscription revenue recognition. However, as we continue to emphasize our SaaS and cloud-based solutions over perpetual offerings, near term year over year comparisons will likely be muted due to the differences in revenue recognition. Over time, we expect the revenue impact of our shift to cloud-first to adjust, and year over year comparisons will become more comparable and favorable.

• Growth opportunities. We believe the market for our enterprise revenue and profit realization software solutions is underpenetrated. Market interest for our software has increased over the past several years providing us with growth opportunities. We have and will continue to invest in our business to more effectively address these opportunities through investment in professional services, research and development, sales, marketing and support functions. In addition to organic growth, we have acquired, and may continue to acquire companies or technologies that can contribute to the strategic, operational and financial growth of our business. We expect to continue to explore both organic and inorganic growth opportunities.

• Uncertain global economic conditions. During 2015 and continuing in the first quarter of 2016, the global economic environment continued to show signs of uncertainty regarding future domestic and global economic growth, and the

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global financial system included numerous ongoing geopolitical issues around the globe. During uncertain economic conditions, we generally experience longer sales cycles, increased scrutiny on purchasing decisions and overall cautiousness taken by customers. In addition, certain foreign countries continue to face significant economic and political crises, and it is possible that these crises could result in economic deterioration in the markets in which we operate. This economic uncertainty may negatively affect the overall demand environment in fiscal 2016, particularly in Europe. We believe that our expanded offerings of industry-specific solutions and innovative technology will enable us to stay competitive in a challenging economic environment as business leaders continue to focus on projects that quickly deliver value, however the extent to which the current economic conditions will further affect our business is uncertain.

• Effective tax rate. The income tax rates vary from the federal and state statutory rates due to the valuation allowances on our deferred tax assets and foreign withholding taxes; changing tax laws, regulations, and interpretations in multiple jurisdictions in which we operate; changes to the financial accounting rules for income taxes; unanticipated changes in tax rates; differences in accounting and tax treatment of our equity-based compensation and the tax effects of purchase accounting for acquisitions. We expect this fluctuation in income tax rates to continue as well as its potential impact on our results of operations.

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Results of Operations

The following table sets forth certain items in our Condensed Consolidated Statements of Comprehensive Income (Loss) as a percentage of total revenues for the three months ended March 31, 2016 and 2015:

	Three Months Ended March 31,
	2016		2015
Revenue:
License	9	%	26	%
Services	26		22
Subscription	22		17
Total license, services and subscription	56		64
Maintenance and support	44		36
Total revenue	100		100
Cost of revenue:
License	—		—
Services	24		20
Subscription	9		7
Total cost of license, services and subscription	33		28
Maintenance and support	9		7
Total cost of revenue	41		34
Gross profit	59		66
Operating Expenses:
Selling and marketing	48		42
General and administrative	24		24
Research and development	35		27
Total operating expenses	106		92
Convertible debt interest and amortization	(6	)	(5	)
Other expense, net	—		—
Loss before income tax provision	(54	)	(32	)
Income tax provision (benefit)	—		—
Net loss	(54	)%	(33	)%

Revenue:

	Three Months Ended March 31,				Variance
(Dollars in thousands)	2016		2015		$			%
License	$	3,302	$	11,192	$	(7,890	)	(70	)%
Services	9,763		9,631		132			1	%
Subscription	8,201		7,300		901			12	%
Total license, services and subscription	21,266		28,123		(6,857		)	(24	)%
Maintenance and support	16,662		15,556		1,106			7	%
Total revenue	$	37,928	$	43,679	$	(5,751	)	(13	)%

License revenue. Our license revenue is dependent on the amount of perpetual licenses sold in the period, as well as the timing of revenue recognition. As a result of our shift to a cloud-first strategy, we experienced a decrease in the sale of perpetual licenses and a corresponding decrease in license revenue, which included a $5.1 million decrease in license revenue that was recognized on a percentage of completion basis and to a lesser extent a decrease of $2.8 million in license revenue recognized upon software delivery. We recognized zero and $2.8 million of license revenue upon software delivery for the three months ended March 31, 2016 and 2015, respectively. As a result of our shift to a cloud-first strategy, we expect that customers will be purchasing

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a lower percentage of perpetual licenses and more subscription-based solutions such as SaaS and cloud-based offerings, resulting in lower future license revenue.

Services revenue. Our services revenue remained relativity unchanged over both periods. Services revenue can vary from period to period depending on different factors, including the level of professional services required to implement our solutions and any additional professional services requested from our existing customers during a particular period.

Subscription revenue.The increase in subscription revenue was primarily attributable to an increase in the number of customers purchasing our cloud-based services. The total number of customers generating subscription revenue was 95 for the three months ended March 31, 2016, as compared to 83 for the three months ended March 31, 2015, an increase of 14%. We expect our subscription revenue will continue to increase as a result of our shift to a cloud-first strategy.

Maintenance and support revenue.The increase in maintenance and support revenue was principally a result of an increase in the number of customers purchasing maintenance and support services as a result of customers licensing our software over the past year. Additionally, our strong maintenance renewal rates provide a recurring base of maintenance revenue upon which new maintenance is added.

Cost of revenue and gross profit:

	Three Months Ended March 31,				Variance
(Dollars in thousands)	2016		2015		$			%
Cost of license	$	62	$	50	$	12		24	%
Cost of services	8,931		8,939		(8		)	—	%
Cost of subscription	3,446		3,075		371			12	%
Total cost of license, services and subscription	12,439		12,064		375			3	%
Cost of maintenance and support	3,272		2,937		335			11	%
Total cost of revenue	15,711		15,001		710			5	%
Gross profit	$	22,217	$	28,678	$	(6,461	)	(23	)%

Cost of license. Cost of license consists of third-party fees for licensed software and remained consistent for the three months ended March 31, 2016 and 2015. License gross profit percentages for the three months ended March 31, 2016 and 2015, remained relatively unchanged as a result of limited third-party fees for licensed software incurred over both periods.

Cost of services. Cost of services remained relatively unchanged over both periods. Services gross profit percentages for the three months ended March 31, 2016 and 2015, were 9% and 7%, respectively. Services gross profit percentages can vary from period to period depending on different factors, including the level of professional services required to implement our solutions, our effective man-day rates and the utilization of our professional services personnel.

Cost of subscription. The increase in cost of subscription was primarily attributable to a $0.4 million increase in infrastructure costs to support our current and anticipated future subscription customer base. The subscription gross profit percentage for both the three months ended March 31, 2016 and 2015, was 58%.

Cost of maintenance and support. The increase in cost of maintenance and support was attributable to an increase in personnel costs associated with the continued growth in our customer maintenance and support function commensurate with our maintenance and support revenue growth. The maintenance and support gross profit percentage was 80% and 81% for the three months ended March 31, 2016 and 2015, respectively.

Gross profit. The decrease in overall gross profit was primarily attributable to a 13% decrease in total revenue for the same period.

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Operating expenses:

	Three Months Ended March 31,				Variance
(Dollars in thousands)	2016		2015		$			%
Selling and marketing	$	18,018	$	18,193	$	(175	)	(1	)%
General and administrative	9,041		10,598		(1,557		)	(15	)%
Research and development	13,132		11,610		1,522			13	%
Total operating expenses	$	40,191	$	40,401	$	(210	)	(1	)%

Selling and marketing expenses. The decrease was primarily attributable to a decrease of $0.3 million in noncash share-based compensation partially offset by an increase of $0.1 million in sales and marketing events and travel expenses.

General and administrative expenses. The decrease was attributable to a decrease of $1.6 million in noncash share-based compensation expense, which included an acceleration of noncash share-based compensation expense of $1.1 million in the first quarter of 2015 due to the change in employment status for our former Chief Financial Officer. The decrease also included a $0.5 million increase in bad debt expense in 2016 as a result of a onetime bad debt recovery in the first quarter of 2015, offset by a $0.5 million decrease in facility and other overhead expenses.

Research and development expenses. The increase was primarily attributable to an increase of $1.3 million of personnel costs as a result of an increase in headcount to support our current and future product development and growth objectives, and an increase of $0.2 million of non-personnel cost primarily attributable to facility and other overhead expenses.

Other expense, net:

	Three Months Ended March 31,						Variance
(Dollars in thousands)	2016			2015			$			%
Convertible debt interest and amortization	$	(2,287	)	$	(2,185	)	$	(102	)	5	%
Other expense, net	$	(58	)	$	(212	)	$	154		(73	)%

Convertible debt interest and amortization. The convertible debt expense for the three months ended March 31, 2016 and 2015 related to coupon interest and amortization of debt discount and issuance costs attributable to our Senior Notes issued in December 2014.

Other expense, net.Other expense, net decreased by $0.2 million during the three months ended March 31, 2016, primarily due to the reduced impact of movements in foreign currency exchange rates during the period.

Income tax provision:

	Three Months Ended March 31,						Variance
(Dollars in thousands)	2016			2015			$		%
Effective tax rate	(1		)%	(1		)%	n/a		n/a
Income tax provision	$	158		$	110		$	48	44	%

Income tax provision.The $0.2 million tax provision for the three months ended March 31, 2016 primarily includes foreign taxes and state taxes not based on pre-tax income. No tax benefit was recognized on jurisdictions with a projected loss for the year due to the valuation allowances on our deferred tax assets.

Our effective tax rate was (1)% for both the three months ended March 31, 2016 and 2015. The income tax rate varies from the 34% federal statutory rate primarily due to the valuation allowances on the Company’s deferred tax assets and the limitation on deductibility of certain officers’ compensation. While the expected tax rate of the Company would be 0% due to the full valuation on the deferred tax assets, the (1)% taxes for the three months ended March 31, 2016 and 2015 are due to foreign and state taxes not based on pre-tax income. Jurisdictions with a projected loss for the year where no tax benefit can be recognized due to the valuation allowances on the Company’s deferred tax assets are excluded from the estimated annual Federal effective tax rate. The impact of such an exclusion could result in a higher or lower effective tax rate during a particular quarter depending on the mix and timing of actual earnings versus annual projections.

22

Liquidity and Capital Resources

At March 31, 2016, we had $118.7 million of cash and cash equivalents and $106.2 million of working capital as compared to $161.8 million of cash and cash equivalents and $124.6 million of working capital at December 31, 2015. In addition, we had $35.0 million of short-term investments as of March 31, 2016 and $2.5 million of short-term investments as of December 31, 2015.

Our principal sources of liquidity are our cash and cash equivalents, short-term investments, cash flows generated from operations and potential borrowings under our Revolver. In December 31, 2014, we issued the Senior Notes to supplement our overall liquidity position. Our material drivers or variants of operating cash flow are net income, noncash expenses (principally share-based compensation, intangible amortization and amortization of debt discount and issuance costs) and the timing of periodic invoicing and cash collections related to licenses, subscriptions and support for our software and related services. The primary source of operating cash flows is the collection of accounts receivable from our customers. Our operating cash flows are also impacted by the timing of payments to our vendors and the payments of our other liabilities. We generally pay our vendors and service providers in accordance with the invoice terms and conditions.

We believe our existing cash, cash equivalents and short-term investments balances, including funds provided by the issuance of our Senior Notes, funds available under our Revolver and our current estimates of future operating cash flows, will provide adequate liquidity and capital resources to meet our operational requirements, anticipated capital expenditures and coupon payments for our Senior Notes for the next twelve months. Our future working capital requirements will depend on many factors, including the operations of our existing business, potential growth of our SaaS and cloud-based services, future acquisitions we might undertake, and expansion into complementary businesses. If such need arises, we may raise additional funds through equity or debt financings.

The following table presents key components of our unaudited condensed consolidated statements of cash flows for the three months ended March 31, 2016 and 2015:

	Three Months Ended March 31,
(Dollars in thousands)	2016			2015
Net cash used in operating activities	$	(2,764	)	$	(1,434	)
Net cash used in investing activities	(35,968		)	(13,715		)
Net cash used in financing activities	(4,365		)	(4,196		)
Cash and cash equivalents (beginning of period)	161,770			161,019
Cash and cash equivalents (end of period)	$	118,700		$	141,660

Net cash used in operating activities. The $1.3 million increase in net cash used in operating activities was primarily due to a $6.2 million increase in net loss driven by our transition to a cloud-first strategy, partially offset by change in working capital.

Net cash used in investing activities. The $22.3 million increase in net cash used in investing activities was primarily due to $20.0 million of net purchases of short-term investments during the three months ended March 31, 2016. In addition, purchases of property and equipment increased by $2.4 million in the three months ended March 31, 2016 as compared to the same period in 2015.

Net cash used in financing activities. The increase of $0.2 million in net cash used in financing activities was primarily the result of an increase of $0.5 million in tax withholding related to net share settlements of restricted stock units and market stock units and an increase of $0.1 million from proceeds from employee stock plan, partially offset by a $0.3 million decrease for the exercise of stock options, a decrease of debt issuance cost related to the convertible debt of $0.4 million and a $0.1 million decrease in payments of notes payable.

Off-Balance Sheet Arrangements

We do not have any off-balance sheet arrangements that have or are reasonably likely to have a current or future effect on our financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures or capital resources that are material. We do not have any relationships with unconsolidated entities or financial partnerships, such

23

as variable interest entities, that would have been established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes.

Contractual Obligations and Commitments

There have been no material changes to our contractual obligations and commitments disclosed in our Annual Report.

Credit facility

In July 2012, we entered into the Revolver. There were no outstanding borrowings under the Revolver as of March 31, 2016. As of March 31, 2016, we had $0.1 million of unamortized debt issuance costs related to the Revolver included in other long-term assets in the unaudited condensed consolidated balance sheets. For the three months ended March 31, 2016 and 2015, we recorded an immaterial amount of amortization of debt issuance cost which is included in other expense, net in the unaudited condensed consolidated statements of comprehensive income (loss).

Recent Accounting Pronouncements

See Note 2, “Recent Accounting Pronouncements” of Notes to Unaudited Condensed Consolidated Financial Statements of this Form 10-Q for discussion of recent accounting pronouncements including the respective expected dates of adoption.

24

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Foreign Currency Exchange Risk

Our contracts are predominately denominated in U.S. dollars. We are exposed to foreign currency exchange risk because we also have contracts denominated in foreign currencies. The effect of a hypothetical 10% adverse change in exchange rates on our foreign denominated receivables as of March 31, 2016 would result in a loss of approximately $0.2 million. We are also exposed to foreign currency risk due to our French subsidiary, PROS France. A hypothetical 10% adverse change in the value of the U.S. dollar in relation to the Euro, which is the Company's single most significant foreign currency exposure, would have changed revenue for the three months ended March 31, 2016 by approximately $0.3 million. In addition, we have operating subsidiaries in the United Kingdom, Canada, Germany, Ireland and Australia. However, due to the relatively low volume of payments made and received by the Company through our foreign subsidiaries, we do not believe that we have significant exposure to foreign currency exchange risks. Fluctuations in foreign currency exchange rates could harm our financial results in the future.

We currently do not use derivative financial instruments to mitigate foreign currency exchange risks. We continue to review this matter and may consider hedging certain foreign exchange risks through the use of currency futures or options in future years.

Interest Rate Risk

The Company is exposed to market risk for changes in interest rates related to the variable interest rate on borrowings under the Revolver. As of March 31, 2016, the Company had no borrowings under the Revolver.

Our investment portfolio mainly consists of short-term interest-bearing obligations, including government and investment grade debt securities and money market funds. These securities are classified as available-for-sale and, consequently, are recorded in the unaudited condensed consolidated balance sheets at fair value with unrealized gains or losses reported as a separate component of accumulated other comprehensive income (loss), net of tax. Our investment strategy is focused on the preservation of capital and supporting our working capital requirements. We do not enter into investments for trading or speculative purposes. We believe that we do not have any material exposure to changes in the fair value as a result of changes in interest rates due to the short term nature of our cash equivalents.

As of March 31, 2016, we had $143.8 million principal amount of Senior Notes outstanding which are fixed rate instruments. Therefore, our results of operations are not subject to fluctuations in interest rates. The fair value of the Senior Notes may change when the market price of our stock fluctuates.

ITEM 4. CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

Our management, with the participation of our chief executive officer and chief financial officer, evaluated the effectiveness of our disclosure controls and procedures as defined in Rules 13a-15(e) or 15d-15(e) under the Exchange Act of 1934, as amended (the "Exchange Act") as of March 31, 2016. Based on our evaluation of our disclosure controls and procedures as of March 31, 2016, our chief executive officer and chief financial officer concluded that our disclosure controls and procedures were effective to ensure that information we are required to disclose in reports that we file or submit under the Exchange Act (i) is recorded, processed, summarized and reported within the time periods specified in SEC rules and forms, and (ii) 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.

Changes in Internal Control over Financial Reporting

There have been no changes in our internal control over financial reporting during the three months ended March 31, 2016 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

25

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

From time to time, we are a party to legal proceedings and claims arising in the ordinary course of business. We are not currently aware of any such proceedings or claims that we believe will have, individually or in the aggregate, a material adverse effect on our business, financial condition, results of operations or cash flows.

ITEM 1A. RISK FACTORS

There have been no material changes to the risk factors as presented in our Annual Report on Form 10-K for the year ended December 31, 2015.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

We have an ongoing authorization from our Board of Directors to repurchase up to $15.0 million in shares of our common stock in the open market or through privately negotiated transactions. As of March 31, 2016, $10.0 million remained available for repurchase under the existing repurchase authorization.

We did not make any purchases of our common stock under this program for the three months ended March 31, 2016.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURE

None.

ITEM 5. OTHER INFORMATION

None.

ITEM 6. EXHIBITS

Index to Exhibits
		Provided	Incorporated by Reference
Exhibit No.	Description	Herewith	Form	SEC File No.	Filing Date
31.1	Certification of Chief Executive Officer Pursuant to Exchange Act Rule 13a-14(a)/15d-14(a).	X
31.2	Certification of Chief Financial Officer Pursuant to Exchange Act Rule 13a-14(a)/ 15d-14(a).	X
32.1*	Certifications of Chief Executive Officer and Chief Financial Officer Pursuant to 18 U.S.C. Section 1350.	X
Exhibit No.	Description
101.INS	XBRL Instance Document.
101.SCH	XBRL Taxonomy Extension Schema Document.
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB	XBRL Taxonomy Extension Label Linkbase Document.
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document.

* This certification shall not be deemed “filed” for purposes of Section 18 of the Securities Act of 1934, or otherwise subject to the liability of that Section, nor shall it be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934.

26

SIGNATURES

Pursuant to the requirements 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.

		PROS HOLDINGS, INC.
May 3, 2016	By:	/s/ Andres Reiner
		Andres Reiner
		President and Chief Executive Officer (Principal Executive Officer)
May 3, 2016	By:	/s/ Stefan Schulz
		Stefan Schulz
		Executive Vice President and Chief Financial Officer (Principal Financial and Accounting Officer)

27

EX-31.1

Exhibit 31.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Andres Reiner, certify that:

1. I have reviewed this quarterly report on Form 10-Q of PROS Holdings, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report; 

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of 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.

May 3, 2016	/s/ Andres Reiner
	Andres Reiner
	President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Stefan Schulz, certify that:

1. I have reviewed this quarterly report on Form 10-Q of PROS Holdings, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report; 

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of 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.

May 3, 2016	/s/ Stefan Schulz
	Stefan Schulz
	Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Andres Reiner, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the quarterly report of PROS Holdings, Inc., on Form 10-Q for the period ended March 31, 2016 fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of PROS Holdings, Inc.

May 3, 2016	/s/ Andres Reiner
	Andres Reiner
	President and Chief Executive Officer

I, Stefan Schulz, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the quarterly report of PROS Holdings, Inc., on Form 10-Q for the period ended March 31, 2016 fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of PROS Holdings, Inc. 

May 3, 2016	/s/ Stefan Schulz
	Stefan Schulz
	Executive Vice President and Chief Financial Officer

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to PROS Holdings, Inc. and will be retained by PROS Holdings, Inc. and furnished to the Securities and Exchange Commission or its staff upon request. This certification “accompanies” the Form 10-Q to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Form 10-Q), irrespective of any general incorporation language contained in such filing.

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2016	Apr. 28, 2016
Entity Information [Line Items]
Entity Registrant Name	PROS HOLDINGS, INC.
Entity Central Index Key	0001392972
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Amendment Flag	false
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		30,320,470
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No

XML

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 118,700	$ 161,770
Short-term Investments	34,951	2,500
Accounts and unbilled receivables, net	37,985	39,115
Prepaid and other current assets	6,203	7,540
Total current assets	197,839	210,925
Property and equipment, net	15,278	15,777
Intangible Assets, Net (Excluding Goodwill)	13,714	14,191
Goodwill	20,847	20,445
Other long term assets, net	2,705	1,873
Total assets	250,383	263,211
Current liabilities:
Accounts payable	6,679	8,273
Accrued liabilities	5,360	4,333
Accrued payroll and other employee benefits	9,847	13,084
Deferred revenue	69,755	60,664
Total current liabilities	91,641	86,354
Long-term deferred revenue	3,621	4,665
Convertible Debt, Noncurrent	117,428	115,860
Other Liabilities, Noncurrent	938	918
Total liabilities	$ 213,628	207,797
Commitments and contingencies (Note 6)
Stockholders' equity:
Preferred stock, $0.001 par value, 5,000,000 shares authorized; none issued	$ 0	0
Common stock, $0.001 par value, 75,000,000 shares authorized; 34,737,801 and 34,156,561 shares issued, respectively; 30,320,216 and 29,738,976 shares outstanding, respectively	35	34
Additional paid-in capital	159,730	158,674
Treasury stock, 4,417,585 common shares, at cost	(13,938)	(13,938)
Retained earnings (Accumulated deficit)	(105,511)	(85,034)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3,561)	(4,322)
Total stockholders' equity	36,755	55,414
Total liabilities and stockholders' equity	$ 250,383	$ 263,211

XML

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Allowance for bad debts	$ 490,000	$ 586,000
Preferred stock - par value	$ 0.001	$ 0.001
Preferred stock - shares authorized	5,000,000	5,000,000
Preferred stock - shares issued	0	0
Common stock - par value	$ 0.001	$ 0.001
Common stock - shares authorized	75,000,000	75,000,000
Common stock - shares issued	34,737,801	34,156,561
Common stock - shares outstanding	30,320,216	29,738,976
Treasury stock - shares	4,417,585	4,417,585

XML

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenue:
License Revenue	$ 3,302	$ 11,192
Sales Revenue, Services, Net	9,763	9,631
Subscription and Circulation Revenue	8,201	7,300
Total license, service and maintenance revenue	21,266	28,123
Maintenance and support	16,662	15,556
Total revenue	37,928	43,679
Cost of revenue:
Cost of license	62	50
Cost of services	8,931	8,939
Cost of subscription	3,446	3,075
Cost of license, service and subscription	12,439	12,064
Maintenance and support	3,272	2,937
Cost of Revenue	15,711	15,001
Gross profit	22,217	28,678
Operating Expenses
Selling and Marketing Expense	18,018	18,193
General and Administrative Expense	9,041	10,598
Research and development	13,132	11,610
Income from operations	(17,974)	(11,723)
Other income (expense):
Convertible debt interest and amortization	(2,287)	(2,185)
Other Nonoperating Income (Expense)	(58)	(212)
Income before income tax provision	(20,319)	(14,120)
Income tax provision (benefit)	158	110
Net income (loss)	$ (20,477)	$ (14,230)
Net earnings (loss) per share:
Basic	$ (0.68)	$ (0.48)
Diluted	$ (0.68)	$ (0.48)
Weighted average number of shares:
Basic	30,226	29,375
Diluted	30,226	29,375
Other comprehensive income, net of tax:
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	$ 756	$ (2,556)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	5	0
Other comprehensive income	761	(2,556)
Comprehensive income (loss)	$ (19,716)	$ (16,786)

XML

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities:
Net income (loss)	$ (20,477)	$ (14,230)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, Depletion and Amortization	2,465	2,395
Amortization of Financing Costs and Discounts	1,568	1,466
Share-based compensation	5,384	7,745
Deferred Income Tax Expense (Benefit)	27	0
Provision for doubtful accounts	(96)	(154)
Changes in operating assets and liabilities:
Accounts and unbilled receivables	1,257	13,065
Prepaid expenses and other assets	458	754
Accounts payable	801	(1,918)
Accrued liabilities	1,034	474
Accrued payroll and other employee benefits	(3,203)	(9,304)
Deferred revenue	8,018	(1,727)
Net cash (used in) provided by operating activities	(2,764)	(1,434)
Investing activities:
Purchases of property and equipment	(3,522)	(1,110)
Internal-use software development costs capitalized	0	(118)
Payments to Acquire Short-term Investments	34,946	12,487
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities	2,500	0
Net cash (used in) provided by investing activities	(35,968)	(13,715)
Financing activities:
Exercise of stock options	0	256
Proceeds from Stock Plans	470	382
Tax withholding related to net share settlement of restricted stock units	(4,797)	(4,319)
Repayments of Notes Payable	(38)	(107)
Payments of Debt Issuance Costs	0	(408)
Net cash (used in) provided by financing activities	(4,365)	(4,196)
Effect of Exchange Rate on Cash and Cash Equivalents	27	(14)
Net change in cash and cash equivalents	(43,070)	(19,359)
Cash and cash equivalents:
Beginning of period	161,770	161,019
End of period	$ 118,700	$ 141,660

XML

Organization and Nature of Operations

3 Months Ended

Mar. 31, 2016

Organization and Nature of Operations [Abstract]

Organization and nature of operations

Organization and Nature of Operations

PROS Holdings, Inc., a Delaware corporation, through its operating subsidiaries (collectively, the "Company"), provides enterprise revenue and profit realization software solutions designed to help companies accelerate sales, formulate winning pricing strategies and align product, demand and availability. The Company's revenue and profit realization solutions are designed to assist customers in growing revenue, supporting sustained profitability and modernizing their business processes. The Company provides its solutions to enterprises across a range of industries, including manufacturing, distribution, services, and travel. The Company offers its solutions via a SaaS delivery model as well as on a perpetual or term license basis. The Company also provides professional services to implement its software applications as well as business consulting. In addition, the Company provides product maintenance and support to its customers through which they receive unspecified upgrades, maintenance releases and bug fixes during the term of the support period on a when-and-if-available basis.

XML

Summary of Significant Accounting Policies (Notes)

3 Months Ended

Mar. 31, 2016

Accounting Policies [Abstract]

Significant Accounting Policies [Text Block]

2. Summary of Significant Accounting Policies

The accompanying unaudited condensed consolidated financial statements reflect the application of significant accounting policies as described below and elsewhere in these notes to the condensed consolidated financial statements.

Basis of presentation

The accompanying unaudited condensed consolidated financial statements of the Company have been prepared in accordance with generally accepted accounting principles in the United States ("GAAP") for interim financial reporting and applicable quarterly reporting regulations of the Securities and Exchange Commission ("SEC"). In management's opinion, the accompanying interim unaudited condensed consolidated financial statements include all adjustments necessary for a fair statement of the financial position of the Company as of March 31, 2016, the results of operations for the three months ended March 31, 2016 and 2015, and cash flows for the three months ended March 31, 2016 and 2015.

Certain information and disclosures normally included in the notes to the annual financial statements prepared in accordance with GAAP have been omitted from these interim unaudited condensed consolidated financial statements pursuant to the rules and regulations of the SEC. Accordingly, these unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2015 ("Annual Report") filed with the SEC. The condensed consolidated balance sheet as of December 31, 2015 was derived from the Company's audited consolidated financial statements but does not include all disclosures required under GAAP.

Basis of consolidation

The unaudited condensed consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. The functional currency of PROS France SAS, formerly known as Cameleon Software SA ("PROS France") is the Euro. The financial statements of this subsidiary are translated into U.S. dollars using period-end rates of exchange for assets and liabilities, historical rates of exchange for equity, and average rates of exchange for the period for revenue and expenses. Translation gains (losses) are recorded in accumulated other comprehensive loss as a component of stockholders' equity.

Dollar amounts

The dollar amounts presented in the tabular data within these footnote disclosures are stated in thousands of dollars, except per share amounts, or as noted within the context of each footnote disclosure.

Use of estimates

The Company makes estimates and assumptions in the preparation of its unaudited condensed consolidated financial statements, and its estimates and assumptions may affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated financial statements, and the reported amounts of revenue and expenses during the reporting periods. Actual results could differ from those estimates. The complexity and judgment required in the Company's estimation process, as well as issues related to the assumptions, risks and uncertainties inherent in the application of the percentage-of-completion method of accounting, affect the amounts of revenue, expenses, unbilled receivables and deferred revenue. Estimates are also used for, but not limited to, receivables, allowance for doubtful accounts, useful lives of assets, depreciation and amortization, income taxes and deferred tax asset valuation, valuation of stock options, other current liabilities and accrued liabilities. Numerous internal and external factors can affect estimates. The critical accounting policies related to the estimates and judgments are discussed in the Company's Annual Report under management's discussion and analysis of financial condition and results of operations. There have been no significant changes to the Company's critical accounting policies as described in the Company's Annual Report.

Revenue recognition

The Company has historically derived its revenue from the licensing and implementation of software solutions and associated software maintenance and support. More recently, the Company has emphasized its offers SaaS and cloud-based services that do not require customers to host the Company's solutions in their data centers. The Company's arrangements with customers typically include: (a) license or SaaS fees paid for the use of software solutions either in perpetuity or over a specified term and implementation fees for configuration, implementation and training services and (b) maintenance and support fees related to technical support and software updates. If there is significant uncertainty about contract completion or collectability is not reasonably assured, revenue is deferred until the uncertainty is sufficiently resolved or collectability is reasonably assured. In addition, revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred and fees are fixed or determinable.

License

The Company derives the majority of its license revenue from the sale of perpetual licenses. For software license arrangements that do not require significant modification or customization of the underlying software, the Company recognizes software licenses revenues at contract provided that professional services are not considered essential to the delivery of the software and when: (1) the Company enters into a legally binding arrangement with a customer for the license of software; (2) the Company delivers the products; (3) the sale price is fixed or determinable and free of contingencies or significant uncertainties; and (4) collection is probable. Revenues that are not recognized at the time of sale because the foregoing conditions are not met, are recognized when those conditions are subsequently met.

The Company evaluates the nature and scope of professional services for each arrangement, and if it determines that the professional services revenue should not be accounted for separately from license revenue, the license revenue is recognized together with the professional services revenue using the percentage-of-completion method or completed contract method. The completed contract method is also used for contracts where there is a risk over final acceptance by the customer or for contracts that are short-term in nature.

The percentage-of-completion method is measured by the percentage of man-days incurred during the reporting period as compared to the estimated total man-days necessary for each contract for implementation of the software solutions. The Company believes that for each such project, man-days expended in proportion to total estimated man-days at completion represents the most reliable and meaningful measure for determining a project's progress toward completion. Under the Company's fixed-fee arrangements, should a loss be anticipated on a contract, the full amount of the loss is recorded when the loss is determinable.

The Company also licenses software solutions under term license agreements that typically include maintenance during the license term. When maintenance is included for the entire term of the term license, there is no renewal rate and the Company has not established vendor specific objective evidence ("VSOE") of fair value for the maintenance on term licenses. For term license agreements, revenue and the associated costs are deferred until the delivery of the solution and recognized ratably over the remaining license term.

Professional Services

In determining whether professional services revenue should be accounted for separately from license revenue, the Companyevaluates whether the professional services are considered essential to the functionality of the software using factors such as: the nature of its software products; whether they are ready for use by the customer upon receipt; the nature of professional services; the availability of services from other vendors; whether the timing of payments for license revenue coincides with performance of services; and whether milestones or acceptance criteria exist that affect the realizability of the software license fee.

If the Company determines that professional services revenue should not be accounted for separately from license revenue, the license revenue is recognized together with the professional services revenue using the percentage-of-completion method or completed contract method. The completed contract method is also used for contracts where there is a risk over final acceptance by the customer or for contracts that are short-term in nature.

For SaaS or cloud based services arrangements that include professional services, the Company determines whether the professional services have stand-alone value. If the Company determines the professional services do not have stand-alone value, the Company treats the transaction as a single element, the professional services revenue is deferred until the customer commences use of the SaaS or cloud-based services, and the professional services revenue is recognized over the remaining term of the arrangement.

SaaS or Cloud-Based Services

For arrangements that include SaaS or cloud-based services, the Company allocates the arrangement consideration between the service and other elements and recognizes the SaaS or cloud-based services fee ratably beginning on the date the customer commences use of those services and continues through the end of the service term. Any revenue related to up-front activation or set-up fees are deferred and recognized ratably over the estimated period that the customer benefits from the related services. Direct and incremental costs related to up-front activation or set-up activities are capitalized until the date the Company's service is made available and then expensed ratably over the estimated period that the customer benefits from the related services.

Multiple Element Arrangements

The Company applies the residual method to recognize revenue for the delivered elements in stand-alone software transactions. Under the residual method, the amount of revenue allocated to delivered elements equals the total arrangement consideration, less the aggregate fair value of any undelivered elements, typically maintenance, provided that VSOE of fair value exists for all undelivered elements. VSOE of fair value is based on the price charged when the element is sold separately or, in the case of maintenance, substantive renewal rates for maintenance.

For multiple element arrangements containing both software and nonsoftware services, the Company must (1) determine whether and when each element has been delivered; (2) determine fair value of each element using the selling price hierarchy of VSOE of fair value, third party evidence ("TPE"), or best estimate of selling price ("BESP"), as applicable; and (3) allocate the total price among the various elements based on the relative selling price method.

For multiple-element arrangements that contain software and nonsoftware elements such as the Company's cloud-based service solutions, the Company allocates revenue between the software and software related elements as a group and any nonsoftware elements based on a relative fair value allocation. The Company determines fair value for each deliverable using the selling price hierarchy described above and utilizes VSOE of fair value if it exists.

In certain instances, the Company may not be able to establish VSOE for all deliverables in an arrangement with multiple elements. This may be due to infrequently selling each element separately, not pricing solutions or services within a narrow range, or only having a limited sales history. In addition, third party evidence may not be available. When the Company is unable to establish selling prices using VSOE or TPE, it uses BESP in the allocation of arrangement consideration. The objective of BESP is to determine the price at which the Company would transact a sale if the product or service were sold on a stand-alone basis. For transactions that only include software and software-related elements, the Company continues to account for such arrangements under the software revenue recognition standards which require it to establish VSOE of fair value to allocate arrangement consideration to multiple deliverables.

Maintenance and Support

Maintenance and support revenue includes post-implementation customer support and the right to unspecified software updates and enhancements on a when and if available basis. The Company recognizes revenue from maintenance arrangements ratably over the period in which the services are provided.

Revenue that has been recognized, but for which the Company has not invoiced the customer, is recorded as unbilled receivables. Invoices that have been issued before revenue has been recognized are recorded as deferred revenue in the accompanying consolidated balance sheets.

Internal-use software

Costs incurred to develop internal-use software during the development stage are capitalized, stated at cost, and depreciated using the straight-line method over the estimated useful lives of the assets. Development stage costs generally include salaries and personnel costs and third-party contractor expenses associated with internal-use software configuration, coding, installation and testing. For the three months ended March 31, 2016 and 2015, the Company capitalized zero and $0.1 million, respectively, of internal-use software development costs related to cloud-based offerings. Capitalized internal-use software development costs related to cloud-based offerings are amortized using the straight-line method over the useful life of the asset. For the three months ended March 31, 2016 and 2015, the Company amortized no capitalized internal-use software development costs. Capitalized software for internal use is included in property and equipment, net in the unaudited condensed consolidated balance sheets. Amortization of capitalized internal-use software development costs, if any, is included in cost of subscription revenues in the accompanying unaudited condensed consolidated statements of comprehensive income (loss).

Impairment of long-lived assets

Long-lived assets are reviewed for impairment whenever an event or change in circumstances indicates that the carrying amount of an asset or group of assets may not be recoverable. The impairment review includes comparison of future cash flows expected to be generated by the asset or group of assets with the associated assets' carrying value. If the carrying value of the asset or group of assets exceeds its expected future cash flows (undiscounted and without interest charges), an impairment loss is recognized to the extent that the carrying amount of the asset exceeds its fair value. The Company recorded no impairment charges during the three months ended March 31, 2016 and 2015.

Noncash share-based compensation

The Company measures all share-based payments to its employees based on the grant date fair value of the awards and recognizes expenses in the Company's unaudited consolidated statement of comprehensive income (loss) on a straight-line basis over the periods during which the recipient is required to perform services (generally over the vesting period of the awards). To date, the Company has granted stock options, Restricted Stock Units ("RSUs"), stock settled Stock Appreciation Rights ("SARs"), and Market Stock Units ("MSUs"). RSUs include both time-based awards as well as performance-based awards in which the number of shares that vest upon satisfying certain conditions from binding customer agreements for the provision of configure, price, and quote ("CPQ") solutions. MSUs are performance-based awards in which the number of shares that vest are based upon the Company's relative stockholder return.

The following table presents the number of shares or units outstanding for each award type as of March 31, 2016 and December 31, 2015, respectively, (in thousands):

Award type	March 31, 2016	December 31, 2015
Stock options	829	829
Restricted stock units (time based)	1,752	1,915
Restricted stock units (performance based)	—	24
Stock appreciation rights	522	522
Market stock units	464	563

Stock options, time based RSUs and SARs vest ratably between one and four years. The actual number of MSUs that will be eligible to vest is based on the total stockholder return of the Company relative to the total stockholder return of the Russell 2000 Index ("Index") over their respective performance periods, as defined by each award's plan documents. The Company did not grant any stock options or SARs during the three months ended March 31, 2016 and 2015.

The fair value of the RSUs is based on the closing price of the Company's stock on the date of grant.

The Company estimates the fair value of MSUs on the date of grant using a Monte Carlo simulation model. The determination of fair value of the MSUs is affected by the Company's stock price and a number of assumptions including the expected volatilities of the Company's stock and the Index, its risk-free interest rate and expected dividends. The Company's expected volatility at the date of grant was based on the historical volatilities of the Company and the Index over the performance period.

The weighted average assumptions used to value the MSUs granted during the three months ended March 31, 2016 were as follows:

	March 31, 2016
Volatility	44.06%
Risk-free interest rate	1.04%
Expected option life in years	2.93
Dividend yield	—

Earnings per share

The Company computes basic earnings (loss) per share by dividing net income (loss) attributable to common stockholders by the weighted average number of common shares outstanding. Diluted earnings (loss) per share is computed by dividing net income (loss) attributable to common stockholders by the weighted average number of common shares and dilutive potential common shares then outstanding. Diluted earnings per share reflect the assumed conversion of all dilutive securities, using the treasury stock method. Dilutive potential common shares consist of shares issuable upon the exercise of stock options, shares of unvested restricted stock units, and settlement of stock appreciation rights. When the Company incurs a net loss, the effect of the Company's outstanding stock options, stock appreciation rights and restricted stock units are not included in the calculation of diluted earnings (loss) per share as the effect would be anti-dilutive. Accordingly, basic and diluted net loss per share are identical.

Short-term investments

The Company's investments are available-for-sale commercial paper that are recorded at fair value in the consolidated balance sheets. Unrealized gains and losses on available-for-sale securities are recorded, net of tax, as a component of accumulated other comprehensive income (loss), unless impairment is considered to be other-than-temporary. Other-than-temporary unrealized losses on available-for-sale securities are generally recorded in gain (loss) on investments, net, in the consolidated statements of comprehensive income (loss) unless certain criteria are met. The primary factors considered when determining if a charge must be recorded because a decline in the fair value of an investment is other-than-temporary include whether: (i) the fair value of the investment is significantly below the Company's cost basis; (ii) the financial condition of the issuer of the security has deteriorated; (iii) if a debt security, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the security; (iv) the decline in fair value has existed for an extended period of time; (v) if a debt security, such security has been downgraded by a rating agency; and (vi) the Company has the intent and ability to retain the investment for a period of time sufficient to allow for any anticipated recovery in fair value. Investments with remaining maturities of twelve months or less are classified as short-term investments since they are readily convertible to cash to fund short-term operations. Investments with remaining maturities of more than twelve months are classified as long-term investments. All of the Company's investments had contractual maturities of less than twelve months as of March 31, 2016.

Fair value measurement

The Company's financial assets that are measured at fair value on a recurring basis consisted of $95.3 million and $127.2 million invested in treasury money market funds at March 31, 2016 and December 31, 2015, respectively. The fair value of these accounts is determined based on quoted market prices, which represents level 1 in the fair value hierarchy as defined by Accounting Standard Codification ("ASC") 820, "Fair Value Measurement and Disclosure."

The fair value of the Company's short-term investments which is comprised of available-for-sale commercial paper was $35.0 million and $2.5 million as of March 31, 2016 and December 31, 2015, respectively. The fair value of these accounts is determined based on quoted market prices for similar assets in active markets, which represents level 2 in the fair value hierarchy. The Company recorded an immaterial amount of unrealized gain related to the short-term investments for the three months ended March 31, 2016 and 2015. Reclassification adjustments for realized gain (loss) on available-for-sale securities in net income were immaterial for the three months ended March 31, 2016 and 2015.

Deferred revenue and unbilled receivables

Software license and implementation services that have been performed, but for which the Company has not invoiced the customer, are recorded as unbilled receivables, and invoices that have been issued before the software license and implementation, maintenance and subscription services have been performed are recorded as deferred revenue in the accompanying unaudited condensed consolidated balance sheets.

Credit facility

As of March 31, 2016, the Company had no outstanding borrowings under the Company's $50 million secured Credit Agreement ("Revolver"), and $0.1 million of unamortized debt issuance costs related to the Revolver is included in other long-term assets in the condensed consolidated balance sheets. For the three months ended March 31, 2016 and 2015, the Company recorded an immaterial amount of amortization of debt issuance cost which is included in other expense, net in the unaudited condensed consolidated statements of comprehensive income (loss).

Income taxes

The Company recorded an income tax provision of $0.2 million and $0.1 million for the three months ended March 31, 2016 and 2015, respectively, primarily related to foreign income taxes and state taxes not based on income. The effective tax rate for the three months ended March 31, 2016 and 2015 was (1)%. The income tax rates vary from the federal and state statutory rates primarily due to the valuation allowances on the Company’s deferred tax assets, the limitation on deductibility of certain officers’ compensation, and foreign and state taxes not based on income. The Company estimates its annual effective tax rate at the end of each quarterly period. Jurisdictions with a projected loss for the year where no tax benefit can be recognized due to the valuation allowances on the Company’s deferred tax assets are excluded from the estimated annual effective tax rate. The impact of such an exclusion could result in a higher or lower effective tax rate during a particular quarter depending on the mix and timing of actual earnings versus annual projections.

Recently adopted accounting pronouncements

In April 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2015-03, "Simplifying the Presentations of Debt Issuance Costs", which requires debt issuance cost to be presented in the balance sheet as a direct deduction from the carrying value of the associated debt liability, consistent with the presentation of a debt discount. In August 2015, the FASB issued ASU 2015-15, "Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements", which provides clarification regarding costs to secure revolving lines of credit, which are, at the outset, not associated with an outstanding borrowing. ASU 2015-15 provides commentary that the SEC staff would not object to an entity deferring and presenting costs associated with line-of-credit arrangements as an asset and subsequently amortizing them ratably over the term of the revolving debt arrangement. These new standards are effective for interim and annual periods beginning on January 1, 2016, and are required to be retrospectively adopted. The Company adopted these standards on January 1, 2016. As of December 31, 2015, $0.1 million and $0.4 million of unamortized debt issuance costs related to the Company’s convertible Senior Notes were reclassified in the condensed consolidated balance sheet from prepaid and other current assets and other long-term assets, respectively, to convertible debt, net. The Company will continue to defer and present the debt issuance cost related to its revolving credit facility in other long-term assets and amortize it ratably over the term of the agreement.

In April 2015, the FASB issued ASU 2015-05, “Intangibles - Goodwill and Other Internal-Use Software”. The amendments in this update provide guidance to customers about whether a cloud computing arrangement includes a software license, and if so, how the software license element of the arrangement should be accounted for by the customer. The new standard will be effective for annual period ending after December 15, 2015, and all reporting periods thereafter. The Company adopted this standard on January 1, 2016, and there was no impact on the Company's consolidated financial statements.

Recent accounting pronouncements

In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)," which supersedes nearly all existing revenue recognition guidance under GAAP and permits the use of either the retrospective or cumulative effect transition method. In August 2015, the FASB issued ASU 2015-14, "Revenue from Contracts with Customers: Deferral of the Effective Date", which deferred the effective date of the new revenue standard for periods beginning after December 15, 2016 to December 15, 2017, with early adoption permitted but not earlier than the original effective date. In March 2016, the FASB issued ASU 2016-08, “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations”, which clarifies the implementation of guidance on principal versus agent considerations. In April 2016, the FASB issued ASU 2016-10, "Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligation and Licensing", which clarifies the implementation of guidance on identifying performance obligations and licensing. These standards are effective for the Company in the first quarter of fiscal 2018. The Company has not yet selected a transition method and is currently evaluating the effect that the updated standards will have on the Company's consolidated financial statements and related disclosures.

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)”, which requires the lessee to recognize most leases on the balance sheet thereby resulting in the recognition of lease assets and liabilities for those leases currently classified as operating leases. Lessor accounting remains largely unchanged from current guidance, however, ASU 2016-02 provides improvements that are intended to align lessor accounting with the lessee model and with updated revenue recognition guidance. This standard is effective for interim and annual reporting periods beginning after December 15, 2018. The Company is currently assessing the impact of ASU 2016-02 on its condensed consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, “Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting”, which is intended to simplify several aspects of the accounting for share-based payment transactions including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. This standard is effective for interim and annual reporting periods beginning after December 15, 2016. The Company is currently assessing the impact of ASU 2016-09 on its condensed consolidated financial statements.

With the exception of the new standards discussed above, there have been no other recent accounting pronouncements or changes in accounting pronouncements during the three months ended March 31, 2016, as compared to the recent accounting pronouncements described in the Company's Annual Report, that are of significance or potential significance to the Company.

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Earnings per Share (Note)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Earnings per Share

Earnings per Share

The following table sets forth the computation of basic and diluted earnings per share for the three months ended March 31, 2016 and 2015:

	Three Months Ended March 31,
(in thousands, except per share data)	2016			2015
Numerator:
Net loss	$	(20,477	)	$	(14,230	)
Denominator:
Weighted average shares (basic)	30,226			29,375
Dilutive effect of potential common shares	—			—
Weighted average shares (diluted)	30,226			29,375
Basic loss per share	$	(0.68	)	$	(0.48	)
Diluted loss per share	$	(0.68	)	$	(0.48	)

Dilutive potential common shares consist of shares issuable upon the exercise of stock options, settlement of SARs, and the vesting of RSUs and MSUs. Potential common shares determined to be antidilutive and excluded from diluted weighted average shares outstanding were approximately 2.0 million and 2.2 million for the three months ended March 31, 2016 and 2015, respectively. Basic shares were used to calculate loss per share for the three months ended March 31, 2016 and 2015.

Since the Company has the intention and ability to settle the principal amount of its Senior Notes (see Note 5) in cash, the treasury stock method is expected to be used for calculating any potential dilutive effect of the conversion spread on diluted net income per share, if applicable. The conversion spread will have a dilutive impact on diluted net income per share of common stock when the average market price of common stock for a given period exceeds the conversion price of $33.79 per share.

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Noncash Share-based Compensation (Note)

3 Months Ended

Mar. 31, 2016

Noncash Share-based Compensation [Abstract]

Noncash Share-based Compensation

Noncash Share-based Compensation

During the three months ended March 31, 2016, the Company granted 552,382 RSUs with a weighted average grant-date fair value of $11.71 per share. The Company granted 152,500 MSUs with a weighted average grant-date fair value of $14.29 to certain executive employees during the three months ended March 31, 2016. These MSUs vest on March 1, 2019 and the actual number of MSUs that will be eligible to vest is based on the total stockholder return of the Company relative to the total stockholder return of the Index over the Performance Period, as defined by each award's plan documents or individual award agreements. The Company did not grant any stock options or SARs during the three months ended March 31, 2016.

Share-based compensation expense is allocated to expense categories on the unaudited condensed consolidated statements of comprehensive income (loss). The following table summarizes share-based compensation expense included in the Company's unaudited condensed consolidated statements of comprehensive income (loss) for the three months ended March 31, 2016 and 2015:

	Three Months Ended March 31,
	2016		2015
Share-based compensation:
Cost of revenue	$	599	$	1,013
Operating expenses:
Selling and marketing	1,780		2,032
General and administrative	1,730		3,348
Research and development	1,275		1,352
Total included in operating expenses	4,785		6,732
Total share-based compensation expense	$	5,384	$	7,745

In January 2016, the number of shares available for issuance increased by 900,000 to 9,968,000 under an evergreen provision in the Company's 2007 Equity Incentive Plan ("2007 Stock Plan"). As of March 31, 2016, 1,749,726 shares remained available for issuance under the 2007 Stock Plan.

At March 31, 2016, the Company had an estimated $41.9 million of total unrecognized compensation costs related to share-based compensation arrangements. These costs will be recognized over a weighted average period of 2.4 years.

In June 2013, the Board of Directors authorized an Employee Stock Purchase Plan ("ESPP") which provides for eligible employees to purchase shares on an after-tax basis in an amount between 1% and 10% of their annual pay: (i) on June 30 of each year at a 5% discount of the fair market value of the Company's common stock on January 1 or June 30, whichever is lower, and (ii) on December 31 of each year at a 5% discount of the fair market value of the Company's common stock on July 1 or December 31, whichever is lower. An employee may not purchase more than $5,000 in either of the six-month measurement periods described above or more than $10,000 annually. In November 2015, the Board of Directors amended the ESPP plan to increase the discount to 15% of the fair market value of the Company's common stock effective January 1, 2016. The amendment did not change the accounting treatment of the ESPP plan. During the quarter ended March 31, 2016, the Company issued 23,848 shares under the ESPP. As of March 31, 2016, 425,155 shares remain authorized and available for issuance under the ESPP. As of March 31, 2016, the Company held approximately $0.4 million on behalf of employees for future purchases under the ESPP, and this amount was recorded in accrued liabilities in the Company's unaudited condensed consolidated balance sheet.

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Convertible debt (Notes)

3 Months Ended

Mar. 31, 2016

Debt Disclosure [Abstract]

Long-term Debt [Text Block]

. Convertible Senior Notes

2.0% Convertible Senior Notes Due December 1, 2019

In December 2014, the Company issued $143.8 million aggregate principal amount of 2% convertible Senior Notes (the "Senior Notes") due December 1, 2019, unless earlier purchased by the Company or converted. Interest is payable semiannually in arrears on June 1 and December 1 of each year, commencing on June 1, 2015.

The Senior Notes are governed by an Indenture between the Company, as issuer, and Wilmington Trust, National Association, as trustee. The Senior Notes are the Company's general unsecured obligations and will rank senior in right of payment to all of the Company's indebtedness that is expressly subordinated in right of payment to the Senior Notes, will rank equally in right of payment with all of Company's existing and future liabilities that are not so subordinated, will be effectively junior to any of the Company's secured indebtedness to the extent of the value of the assets securing such indebtedness and will be structurally subordinated to all indebtedness and other liabilities (including trade payables but excluding intercompany obligations owed to the Company or its subsidiaries).

Upon conversion of the Senior Notes, the Company will pay or deliver, as the case may be, cash, shares of the Company's common stock or a combination of cash and shares of common stock, at the Company's election.

The initial conversion rate for the Senior Notes will be 29.5972 shares of common stock per $1,000 in principal amount of Senior Notes, equivalent to a conversion price of approximately $33.79 per share of common stock. Throughout the term of the Senior Notes, the conversion rate may be adjusted upon the occurrence of certain events. Holders of the Senior Notes will not receive any cash payment representing accrued and unpaid interest upon conversion. Accrued but unpaid interest will be deemed to be paid in full upon conversion rather than canceled, extinguished or forfeited. Holders may convert their Senior Notes at their option at any time prior to the close of business on the business day immediately preceding September 1, 2019 only under the following circumstances:

• during any calendar quarter commencing after the calendar quarter ending on March 31, 2015, if the last reported sale price of the common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day;

• during the five consecutive business day period immediately following any five consecutive trading day period in which the trading price per $1,000 principal amount of Senior Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company's common stock and the conversion rate on each such trading day; or

• upon the occurrence of specified corporate events.

On or after September 1, 2019 to the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their Senior Notes regardless of the above. Upon conversion, the Company will pay or deliver cash, shares of its common stock or a combination of cash and shares of its common stock, at its election, as described in the indenture.

As of March 31, 2016, the Senior Notes are not yet convertible.

In accounting for the issuance of the Senior Notes, the Company separated the Senior Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the face value of the Senior Notes as a whole. The excess of the principal amount of the liability component over its carrying amount ("debt discount") is amortized to interest expense over the term of the Senior Notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification.

In accounting for the transaction costs related to the Senior Notes issuance, the Company allocated the total amount incurred to the liability and equity components based on their relative values. Issuance costs attributable to the liability component, totaling $4.3 million, are being amortized to expense over the term of the Senior Notes using the effective interest method, and issuance costs attributable to the equity component, totaling $1.2 million, were netted with the equity component in stockholders' equity. Additionally, the Company recorded an immaterial deferred tax asset on a portion of the equity component transaction costs which are deductible for tax purposes.

The Senior Notes consist of the following (in thousands):

	March 31, 2016			December 31, 2015
Liability component:
Principal	$	143,750		$	143,750
Less: debt discount and issuance cost, net of amortization	(26,322		)	(27,890		)
Net carrying amount	$	117,428		$	115,860
Equity component (1)	$	28,714		$	28,714

(1) Recorded in the consolidated balance sheet within additional paid-in capital, net of $1.2 million issuance cost in equity.

The following table sets forth total interest expense recognized related to the Senior Notes (in thousands):

	Three Months Ended March 31,
	2016		2015
2.0% coupon	$	719	$	719
Amortization of debt issuance costs	204		195
Amortization of debt discount	1,364		1,271
Total	$	2,287	$	2,185

As of March 31, 2016 and December 31, 2015, the fair value of the Senior Notes was $90.3 million and $114.1 million, respectively. The fair value was determined based on inputs that are observable in the market or that could be derived from, or corroborated with, observable market data, including the Company's stock price, interest rates and carrying value of the debt instrument (carrying value excludes the equity component of the Company's convertible notes classified in equity), which represents level 2 in the fair value hierarchy.

Note Hedge

To minimize the impact of potential economic dilution upon conversion of the Senior Notes, the Company entered into convertible note hedge transactions with respect to its common stock (the "Note Hedge"). In December 2014, the Company paid an aggregate amount of $29.4 million for the Note Hedge. The Note Hedge will expire upon maturity of the Senior Notes. The Note Hedge is intended to offset the potential dilution upon conversion of the Senior Notes and/or offset any cash payments the Company is required to make in excess of the principal amount upon conversion of the Senior Notes in the event that the market value per share of the Company's common stock, as measured under the Senior Notes, is greater than the strike price of the Note Hedge, which initially corresponds to the conversion price of the Notes and is subject to anti-dilution adjustments substantially similar to those applicable to the conversion rate of the Senior Notes. The Note Hedge is a separate transaction, entered into by the Company and is not part of the Senior Notes or the Warrant, and has been accounted for as part of additional paid-in capital.

Warrant

Separately, in December 2014, the Company entered into warrant transactions (the "Warrant"), whereby the Company sold warrants to acquire shares of the Company's common stock at a strike price of $45.48 per share. The Company received aggregate proceeds of $17.1 million from the sale of the Warrant. If the average market value per share of the Company's common stock for the reporting period, as measured under the Warrant, exceeds the strike price of the Warrant, the Warrant will have a dilutive effect on the Company's earnings per share. The Warrant is a separate transaction, entered into by the Company and is not part of the Senior Notes or the Note Hedge, and has been accounted for as part of additional paid-in capital. Holders of the Senior Notes and Note Hedge will not have any rights with respect to the Warrant.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Litigation

In the ordinary course of business, the Company regularly becomes involved in contract and other negotiations and, in more limited circumstances, becomes involved in legal proceedings, claims and litigation. The outcomes of these matters are inherently unpredictable. The Company is not currently involved in any outstanding litigation that it believes, individually or in the aggregate, will have a material adverse effect on its business, financial condition, results of operations or cash flows.

Lease commitments

The Company leases office space and office equipment under noncancelable operating leases that expire at various dates. In January 2016, the Company entered into a nine year lease for approximately 5,000 square feet of office space in Paris, France. The lease provides an option to terminate the lease in March 2022. The lease is expected to be an operating lease.

As of March 31, 2016, the future minimum lease commitments related to lease agreements were as follows:

Year Ending December 31,	Amount
Remaining 2016	$	1,873
2017	1,381
2018	868
2019	788
2020	802
2021 and thereafter	400
Total minimum lease payments	$	6,112

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Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2016

Accounting Policies [Abstract]

Basis of presentation

Basis of presentation

The accompanying unaudited condensed consolidated financial statements of the Company have been prepared in accordance with generally accepted accounting principles in the United States ("GAAP") for interim financial reporting and applicable quarterly reporting regulations of the Securities and Exchange Commission ("SEC"). In management's opinion, the accompanying interim unaudited condensed consolidated financial statements include all adjustments necessary for a fair statement of the financial position of the Company as of March 31, 2016, the results of operations for the three months ended March 31, 2016 and 2015, and cash flows for the three months ended March 31, 2016 and 2015.

Certain information and disclosures normally included in the notes to the annual financial statements prepared in accordance with GAAP have been omitted from these interim unaudited condensed consolidated financial statements pursuant to the rules and regulations of the SEC. Accordingly, these unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2015 ("Annual Report") filed with the SEC. The condensed consolidated balance sheet as of December 31, 2015 was derived from the Company's audited consolidated financial statements but does not include all disclosures required under GAAP.

Basis of consolidation

Basis of consolidation

The unaudited condensed consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. The functional currency of PROS France SAS, formerly known as Cameleon Software SA ("PROS France") is the Euro. The financial statements of this subsidiary are translated into U.S. dollars using period-end rates of exchange for assets and liabilities, historical rates of exchange for equity, and average rates of exchange for the period for revenue and expenses. Translation gains (losses) are recorded in accumulated other comprehensive loss as a component of stockholders' equity.

Dollar amounts

Dollar amounts

The dollar amounts presented in the tabular data within these footnote disclosures are stated in thousands of dollars, except per share amounts, or as noted within the context of each footnote disclosure.

Use of estimates

Use of estimates

The Company makes estimates and assumptions in the preparation of its unaudited condensed consolidated financial statements, and its estimates and assumptions may affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated financial statements, and the reported amounts of revenue and expenses during the reporting periods. Actual results could differ from those estimates. The complexity and judgment required in the Company's estimation process, as well as issues related to the assumptions, risks and uncertainties inherent in the application of the percentage-of-completion method of accounting, affect the amounts of revenue, expenses, unbilled receivables and deferred revenue. Estimates are also used for, but not limited to, receivables, allowance for doubtful accounts, useful lives of assets, depreciation and amortization, income taxes and deferred tax asset valuation, valuation of stock options, other current liabilities and accrued liabilities. Numerous internal and external factors can affect estimates. The critical accounting policies related to the estimates and judgments are discussed in the Company's Annual Report under management's discussion and analysis of financial condition and results of operations. There have been no significant changes to the Company's critical accounting policies as described in the Company's Annual Report.

Revenue recognition

Revenue recognition

The Company has historically derived its revenue from the licensing and implementation of software solutions and associated software maintenance and support. More recently, the Company has emphasized its offers SaaS and cloud-based services that do not require customers to host the Company's solutions in their data centers. The Company's arrangements with customers typically include: (a) license or SaaS fees paid for the use of software solutions either in perpetuity or over a specified term and implementation fees for configuration, implementation and training services and (b) maintenance and support fees related to technical support and software updates. If there is significant uncertainty about contract completion or collectability is not reasonably assured, revenue is deferred until the uncertainty is sufficiently resolved or collectability is reasonably assured. In addition, revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred and fees are fixed or determinable.

License

The Company derives the majority of its license revenue from the sale of perpetual licenses. For software license arrangements that do not require significant modification or customization of the underlying software, the Company recognizes software licenses revenues at contract provided that professional services are not considered essential to the delivery of the software and when: (1) the Company enters into a legally binding arrangement with a customer for the license of software; (2) the Company delivers the products; (3) the sale price is fixed or determinable and free of contingencies or significant uncertainties; and (4) collection is probable. Revenues that are not recognized at the time of sale because the foregoing conditions are not met, are recognized when those conditions are subsequently met.

The Company evaluates the nature and scope of professional services for each arrangement, and if it determines that the professional services revenue should not be accounted for separately from license revenue, the license revenue is recognized together with the professional services revenue using the percentage-of-completion method or completed contract method. The completed contract method is also used for contracts where there is a risk over final acceptance by the customer or for contracts that are short-term in nature.

The percentage-of-completion method is measured by the percentage of man-days incurred during the reporting period as compared to the estimated total man-days necessary for each contract for implementation of the software solutions. The Company believes that for each such project, man-days expended in proportion to total estimated man-days at completion represents the most reliable and meaningful measure for determining a project's progress toward completion. Under the Company's fixed-fee arrangements, should a loss be anticipated on a contract, the full amount of the loss is recorded when the loss is determinable.

The Company also licenses software solutions under term license agreements that typically include maintenance during the license term. When maintenance is included for the entire term of the term license, there is no renewal rate and the Company has not established vendor specific objective evidence ("VSOE") of fair value for the maintenance on term licenses. For term license agreements, revenue and the associated costs are deferred until the delivery of the solution and recognized ratably over the remaining license term.

Professional Services

In determining whether professional services revenue should be accounted for separately from license revenue, the Companyevaluates whether the professional services are considered essential to the functionality of the software using factors such as: the nature of its software products; whether they are ready for use by the customer upon receipt; the nature of professional services; the availability of services from other vendors; whether the timing of payments for license revenue coincides with performance of services; and whether milestones or acceptance criteria exist that affect the realizability of the software license fee.

If the Company determines that professional services revenue should not be accounted for separately from license revenue, the license revenue is recognized together with the professional services revenue using the percentage-of-completion method or completed contract method. The completed contract method is also used for contracts where there is a risk over final acceptance by the customer or for contracts that are short-term in nature.

For SaaS or cloud based services arrangements that include professional services, the Company determines whether the professional services have stand-alone value. If the Company determines the professional services do not have stand-alone value, the Company treats the transaction as a single element, the professional services revenue is deferred until the customer commences use of the SaaS or cloud-based services, and the professional services revenue is recognized over the remaining term of the arrangement.

SaaS or Cloud-Based Services

For arrangements that include SaaS or cloud-based services, the Company allocates the arrangement consideration between the service and other elements and recognizes the SaaS or cloud-based services fee ratably beginning on the date the customer commences use of those services and continues through the end of the service term. Any revenue related to up-front activation or set-up fees are deferred and recognized ratably over the estimated period that the customer benefits from the related services. Direct and incremental costs related to up-front activation or set-up activities are capitalized until the date the Company's service is made available and then expensed ratably over the estimated period that the customer benefits from the related services.

Multiple Element Arrangements

The Company applies the residual method to recognize revenue for the delivered elements in stand-alone software transactions. Under the residual method, the amount of revenue allocated to delivered elements equals the total arrangement consideration, less the aggregate fair value of any undelivered elements, typically maintenance, provided that VSOE of fair value exists for all undelivered elements. VSOE of fair value is based on the price charged when the element is sold separately or, in the case of maintenance, substantive renewal rates for maintenance.

For multiple element arrangements containing both software and nonsoftware services, the Company must (1) determine whether and when each element has been delivered; (2) determine fair value of each element using the selling price hierarchy of VSOE of fair value, third party evidence ("TPE"), or best estimate of selling price ("BESP"), as applicable; and (3) allocate the total price among the various elements based on the relative selling price method.

For multiple-element arrangements that contain software and nonsoftware elements such as the Company's cloud-based service solutions, the Company allocates revenue between the software and software related elements as a group and any nonsoftware elements based on a relative fair value allocation. The Company determines fair value for each deliverable using the selling price hierarchy described above and utilizes VSOE of fair value if it exists.

In certain instances, the Company may not be able to establish VSOE for all deliverables in an arrangement with multiple elements. This may be due to infrequently selling each element separately, not pricing solutions or services within a narrow range, or only having a limited sales history. In addition, third party evidence may not be available. When the Company is unable to establish selling prices using VSOE or TPE, it uses BESP in the allocation of arrangement consideration. The objective of BESP is to determine the price at which the Company would transact a sale if the product or service were sold on a stand-alone basis. For transactions that only include software and software-related elements, the Company continues to account for such arrangements under the software revenue recognition standards which require it to establish VSOE of fair value to allocate arrangement consideration to multiple deliverables.

Maintenance and Support

Maintenance and support revenue includes post-implementation customer support and the right to unspecified software updates and enhancements on a when and if available basis. The Company recognizes revenue from maintenance arrangements ratably over the period in which the services are provided.

Revenue that has been recognized, but for which the Company has not invoiced the customer, is recorded as unbilled receivables. Invoices that have been issued before revenue has been recognized are recorded as deferred revenue in the accompanying consolidated balance sheets.

Internal-use software

Internal-use software

Costs incurred to develop internal-use software during the development stage are capitalized, stated at cost, and depreciated using the straight-line method over the estimated useful lives of the assets. Development stage costs generally include salaries and personnel costs and third-party contractor expenses associated with internal-use software configuration, coding, installation and testing. For the three months ended March 31, 2016 and 2015, the Company capitalized zero and $0.1 million, respectively, of internal-use software development costs related to cloud-based offerings. Capitalized internal-use software development costs related to cloud-based offerings are amortized using the straight-line method over the useful life of the asset. For the three months ended March 31, 2016 and 2015, the Company amortized no capitalized internal-use software development costs. Capitalized software for internal use is included in property and equipment, net in the unaudited condensed consolidated balance sheets. Amortization of capitalized internal-use software development costs, if any, is included in cost of subscription revenues in the accompanying unaudited condensed consolidated statements of comprehensive income (loss).

Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block]

Impairment of long-lived assets

Long-lived assets are reviewed for impairment whenever an event or change in circumstances indicates that the carrying amount of an asset or group of assets may not be recoverable. The impairment review includes comparison of future cash flows expected to be generated by the asset or group of assets with the associated assets' carrying value. If the carrying value of the asset or group of assets exceeds its expected future cash flows (undiscounted and without interest charges), an impairment loss is recognized to the extent that the carrying amount of the asset exceeds its fair value. The Company recorded no impairment charges during the three months ended March 31, 2016 and 2015.

Noncash share-based compensation

Noncash share-based compensation

The Company measures all share-based payments to its employees based on the grant date fair value of the awards and recognizes expenses in the Company's unaudited consolidated statement of comprehensive income (loss) on a straight-line basis over the periods during which the recipient is required to perform services (generally over the vesting period of the awards). To date, the Company has granted stock options, Restricted Stock Units ("RSUs"), stock settled Stock Appreciation Rights ("SARs"), and Market Stock Units ("MSUs"). RSUs include both time-based awards as well as performance-based awards in which the number of shares that vest upon satisfying certain conditions from binding customer agreements for the provision of configure, price, and quote ("CPQ") solutions. MSUs are performance-based awards in which the number of shares that vest are based upon the Company's relative stockholder return.

The following table presents the number of shares or units outstanding for each award type as of March 31, 2016 and December 31, 2015, respectively, (in thousands):

Award type	March 31, 2016	December 31, 2015
Stock options	829	829
Restricted stock units (time based)	1,752	1,915
Restricted stock units (performance based)	—	24
Stock appreciation rights	522	522
Market stock units	464	563

Stock options, time based RSUs and SARs vest ratably between one and four years. The actual number of MSUs that will be eligible to vest is based on the total stockholder return of the Company relative to the total stockholder return of the Russell 2000 Index ("Index") over their respective performance periods, as defined by each award's plan documents. The Company did not grant any stock options or SARs during the three months ended March 31, 2016 and 2015.

The fair value of the RSUs is based on the closing price of the Company's stock on the date of grant.

The Company estimates the fair value of MSUs on the date of grant using a Monte Carlo simulation model. The determination of fair value of the MSUs is affected by the Company's stock price and a number of assumptions including the expected volatilities of the Company's stock and the Index, its risk-free interest rate and expected dividends. The Company's expected volatility at the date of grant was based on the historical volatilities of the Company and the Index over the performance period.

The weighted average assumptions used to value the MSUs granted during the three months ended March 31, 2016 were as follows:

	March 31, 2016
Volatility	44.06%
Risk-free interest rate	1.04%
Expected option life in years	2.93
Dividend yield	—

Earnings per share

Earnings per share

The Company computes basic earnings (loss) per share by dividing net income (loss) attributable to common stockholders by the weighted average number of common shares outstanding. Diluted earnings (loss) per share is computed by dividing net income (loss) attributable to common stockholders by the weighted average number of common shares and dilutive potential common shares then outstanding. Diluted earnings per share reflect the assumed conversion of all dilutive securities, using the treasury stock method. Dilutive potential common shares consist of shares issuable upon the exercise of stock options, shares of unvested restricted stock units, and settlement of stock appreciation rights. When the Company incurs a net loss, the effect of the Company's outstanding stock options, stock appreciation rights and restricted stock units are not included in the calculation of diluted earnings (loss) per share as the effect would be anti-dilutive. Accordingly, basic and diluted net loss per share are identical.

Investment, Policy [Policy Text Block]

Short-term investments

The Company's investments are available-for-sale commercial paper that are recorded at fair value in the consolidated balance sheets. Unrealized gains and losses on available-for-sale securities are recorded, net of tax, as a component of accumulated other comprehensive income (loss), unless impairment is considered to be other-than-temporary. Other-than-temporary unrealized losses on available-for-sale securities are generally recorded in gain (loss) on investments, net, in the consolidated statements of comprehensive income (loss) unless certain criteria are met. The primary factors considered when determining if a charge must be recorded because a decline in the fair value of an investment is other-than-temporary include whether: (i) the fair value of the investment is significantly below the Company's cost basis; (ii) the financial condition of the issuer of the security has deteriorated; (iii) if a debt security, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the security; (iv) the decline in fair value has existed for an extended period of time; (v) if a debt security, such security has been downgraded by a rating agency; and (vi) the Company has the intent and ability to retain the investment for a period of time sufficient to allow for any anticipated recovery in fair value. Investments with remaining maturities of twelve months or less are classified as short-term investments since they are readily convertible to cash to fund short-term operations. Investments with remaining maturities of more than twelve months are classified as long-term investments. All of the Company's investments had contractual maturities of less than twelve months as of March 31, 2016.

Fair value measurement

Fair value measurement

The Company's financial assets that are measured at fair value on a recurring basis consisted of $95.3 million and $127.2 million invested in treasury money market funds at March 31, 2016 and December 31, 2015, respectively. The fair value of these accounts is determined based on quoted market prices, which represents level 1 in the fair value hierarchy as defined by Accounting Standard Codification ("ASC") 820, "Fair Value Measurement and Disclosure."

The fair value of the Company's short-term investments which is comprised of available-for-sale commercial paper was $35.0 million and $2.5 million as of March 31, 2016 and December 31, 2015, respectively. The fair value of these accounts is determined based on quoted market prices for similar assets in active markets, which represents level 2 in the fair value hierarchy. The Company recorded an immaterial amount of unrealized gain related to the short-term investments for the three months ended March 31, 2016 and 2015. Reclassification adjustments for realized gain (loss) on available-for-sale securities in net income were immaterial for the three months ended March 31, 2016 and 2015.

Deferred Revenue and Unbilled Receivables [Policy Text Block]

Deferred revenue and unbilled receivables

Software license and implementation services that have been performed, but for which the Company has not invoiced the customer, are recorded as unbilled receivables, and invoices that have been issued before the software license and implementation, maintenance and subscription services have been performed are recorded as deferred revenue in the accompanying unaudited condensed consolidated balance sheets.

Credit Facility

Credit facility

As of March 31, 2016, the Company had no outstanding borrowings under the Company's $50 million secured Credit Agreement ("Revolver"), and $0.1 million of unamortized debt issuance costs related to the Revolver is included in other long-term assets in the condensed consolidated balance sheets. For the three months ended March 31, 2016 and 2015, the Company recorded an immaterial amount of amortization of debt issuance cost which is included in other expense, net in the unaudited condensed consolidated statements of comprehensive income (loss).

Income taxes

Income taxes

The Company recorded an income tax provision of $0.2 million and $0.1 million for the three months ended March 31, 2016 and 2015, respectively, primarily related to foreign income taxes and state taxes not based on income. The effective tax rate for the three months ended March 31, 2016 and 2015 was (1)%. The income tax rates vary from the federal and state statutory rates primarily due to the valuation allowances on the Company’s deferred tax assets, the limitation on deductibility of certain officers’ compensation, and foreign and state taxes not based on income. The Company estimates its annual effective tax rate at the end of each quarterly period. Jurisdictions with a projected loss for the year where no tax benefit can be recognized due to the valuation allowances on the Company’s deferred tax assets are excluded from the estimated annual effective tax rate. The impact of such an exclusion could result in a higher or lower effective tax rate during a particular quarter depending on the mix and timing of actual earnings versus annual projections.

New Accounting Pronouncements, Policy [Policy Text Block]

Recently adopted accounting pronouncements

In April 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2015-03, "Simplifying the Presentations of Debt Issuance Costs", which requires debt issuance cost to be presented in the balance sheet as a direct deduction from the carrying value of the associated debt liability, consistent with the presentation of a debt discount. In August 2015, the FASB issued ASU 2015-15, "Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements", which provides clarification regarding costs to secure revolving lines of credit, which are, at the outset, not associated with an outstanding borrowing. ASU 2015-15 provides commentary that the SEC staff would not object to an entity deferring and presenting costs associated with line-of-credit arrangements as an asset and subsequently amortizing them ratably over the term of the revolving debt arrangement. These new standards are effective for interim and annual periods beginning on January 1, 2016, and are required to be retrospectively adopted. The Company adopted these standards on January 1, 2016. As of December 31, 2015, $0.1 million and $0.4 million of unamortized debt issuance costs related to the Company’s convertible Senior Notes were reclassified in the condensed consolidated balance sheet from prepaid and other current assets and other long-term assets, respectively, to convertible debt, net. The Company will continue to defer and present the debt issuance cost related to its revolving credit facility in other long-term assets and amortize it ratably over the term of the agreement.

In April 2015, the FASB issued ASU 2015-05, “Intangibles - Goodwill and Other Internal-Use Software”. The amendments in this update provide guidance to customers about whether a cloud computing arrangement includes a software license, and if so, how the software license element of the arrangement should be accounted for by the customer. The new standard will be effective for annual period ending after December 15, 2015, and all reporting periods thereafter. The Company adopted this standard on January 1, 2016, and there was no impact on the Company's consolidated financial statements.

Recent accounting pronouncements

In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)," which supersedes nearly all existing revenue recognition guidance under GAAP and permits the use of either the retrospective or cumulative effect transition method. In August 2015, the FASB issued ASU 2015-14, "Revenue from Contracts with Customers: Deferral of the Effective Date", which deferred the effective date of the new revenue standard for periods beginning after December 15, 2016 to December 15, 2017, with early adoption permitted but not earlier than the original effective date. In March 2016, the FASB issued ASU 2016-08, “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations”, which clarifies the implementation of guidance on principal versus agent considerations. In April 2016, the FASB issued ASU 2016-10, "Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligation and Licensing", which clarifies the implementation of guidance on identifying performance obligations and licensing. These standards are effective for the Company in the first quarter of fiscal 2018. The Company has not yet selected a transition method and is currently evaluating the effect that the updated standards will have on the Company's consolidated financial statements and related disclosures.

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)”, which requires the lessee to recognize most leases on the balance sheet thereby resulting in the recognition of lease assets and liabilities for those leases currently classified as operating leases. Lessor accounting remains largely unchanged from current guidance, however, ASU 2016-02 provides improvements that are intended to align lessor accounting with the lessee model and with updated revenue recognition guidance. This standard is effective for interim and annual reporting periods beginning after December 15, 2018. The Company is currently assessing the impact of ASU 2016-02 on its condensed consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, “Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting”, which is intended to simplify several aspects of the accounting for share-based payment transactions including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. This standard is effective for interim and annual reporting periods beginning after December 15, 2016. The Company is currently assessing the impact of ASU 2016-09 on its condensed consolidated financial statements.

With the exception of the new standards discussed above, there have been no other recent accounting pronouncements or changes in accounting pronouncements during the three months ended March 31, 2016, as compared to the recent accounting pronouncements described in the Company's Annual Report, that are of significance or potential significance to the Company.

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Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2016

Accounting Policies [Abstract]

Awards outstanding [Table Text Block]

The following table presents the number of shares or units outstanding for each award type as of March 31, 2016 and December 31, 2015, respectively, (in thousands):

Award type	March 31, 2016	December 31, 2015
Stock options	829	829
Restricted stock units (time based)	1,752	1,915
Restricted stock units (performance based)	—	24
Stock appreciation rights	522	522
Market stock units	464	563

Market Stock Units Valuation Assumptions [Table Text Block]

The weighted average assumptions used to value the MSUs granted during the three months ended March 31, 2016 were as follows:

	March 31, 2016
Volatility	44.06%
Risk-free interest rate	1.04%
Expected option life in years	2.93
Dividend yield	—

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Earnings per Share (Table)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The following table sets forth the computation of basic and diluted earnings per share for the three months ended March 31, 2016 and 2015:

	Three Months Ended March 31,
(in thousands, except per share data)	2016			2015
Numerator:
Net loss	$	(20,477	)	$	(14,230	)
Denominator:
Weighted average shares (basic)	30,226			29,375
Dilutive effect of potential common shares	—			—
Weighted average shares (diluted)	30,226			29,375
Basic loss per share	$	(0.68	)	$	(0.48	)
Diluted loss per share	$	(0.68	)	$	(0.48	)

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Noncash Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2016

Noncash Share-based Compensation [Abstract]

Schedule of Share-based Compensation Expense

The following table summarizes share-based compensation expense included in the Company's unaudited condensed consolidated statements of comprehensive income (loss) for the three months ended March 31, 2016 and 2015:

	Three Months Ended March 31,
	2016		2015
Share-based compensation:
Cost of revenue	$	599	$	1,013
Operating expenses:
Selling and marketing	1,780		2,032
General and administrative	1,730		3,348
Research and development	1,275		1,352
Total included in operating expenses	4,785		6,732
Total share-based compensation expense	$	5,384	$	7,745

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Convertible debt (Tables)

3 Months Ended

Mar. 31, 2016

Debt Disclosure [Abstract]

Convertible Debt [Table Text Block]

The Senior Notes consist of the following (in thousands):

	March 31, 2016			December 31, 2015
Liability component:
Principal	$	143,750		$	143,750
Less: debt discount and issuance cost, net of amortization	(26,322		)	(27,890		)
Net carrying amount	$	117,428		$	115,860
Equity component (1)	$	28,714		$	28,714

(1) Recorded in the consolidated balance sheet within additional paid-in capital, net of $1.2 million issuance cost in equity.

The following table sets forth total interest expense recognized related to the Senior Notes (in thousands):

	Three Months Ended March 31,
	2016		2015
2.0% coupon	$	719	$	719
Amortization of debt issuance costs	204		195
Amortization of debt discount	1,364		1,271
Total	$	2,287	$	2,185

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Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2016

Future minimum lease commitments [Line Items]

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

As of March 31, 2016, the future minimum lease commitments related to lease agreements were as follows:

Year Ending December 31,	Amount
Remaining 2016	$	1,873
2017	1,381
2018	868
2019	788
2020	802
2021 and thereafter	400
Total minimum lease payments	$	6,112

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Summary of Significant Accounting Policies Significant Accounting Policies (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Summary of Significant Accounting Policies [Line Items]
Internal-use software development costs capitalized	$ 0	$ 118,000
Tangible Asset Impairment Charges	0
Short-term Investments	34,951,000		$ 2,500,000
Treasury money market funds, at fair value	95,300,000		$ 127,200,000
Line of Credit Facility, Amount Outstanding	0
Line of Credit Facility, Maximum Borrowing Capacity	50,000,000
Unamortized Debt Issuance Expense	100,000
Income Tax Expense (Benefit)	$ 158,000	110,000
Effective income tax rate	(1.00%)
Cloud-based product offerings [Member]
Summary of Significant Accounting Policies [Line Items]
Internal-use software development costs capitalized	$ 0	$ 118,000
Capitalized Computer Software, Amortization	$ 0
Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years

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Summary of Significant Accounting Policies Awards Outstanding (Details) - shares shares in Thousands	Mar. 31, 2016	Dec. 31, 2015
Stock options
Awards outstanding [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	829	829
Restricted Stock Units (RSUs) [Member]
Awards outstanding [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	1,752	1,915
Performance Shares [Member]
Awards outstanding [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	0	24
Stock appreciation rights
Awards outstanding [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	522	522
Market share units
Awards outstanding [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	464	563

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Summary of Significant Accounting Policies Fair Value Calculation Assumptions (Details) - Market share units	3 Months Ended
	Mar. 31, 2016
Valuation Assumptions for MSUs [Line Items]
Volatility	44.06%
Risk-free interest rate	1.04%
Expected life, in years	2 years 11 months 5 days
Dividend yield	0.00%

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Summary of Significant Accounting Policies New Accounting Pronouncements (Details) - Accounting Standards Update 2015-03 [Member] $ in Millions	Dec. 31, 2015 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt Issuance Costs, Current, Net	$ 0.1
Debt Issuance Costs, Noncurrent, Net	$ 0.4

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Earnings per Share (Details) - $ / shares shares in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive potential common shares excluded from computation of earnings per share	2,034	2,182
Debt Instrument, Convertible, Stock Price Trigger	$ 33.79

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Earnings per Share Basis and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Numerator
Net income (loss)	$ (20,477)	$ (14,230)
Denominator
Weighted average shares (basic)	30,226	29,375
Dilutive effect of potential common shares	0	0
Weighted average shares (diluted)	30,226	29,375
Basic earnings per share	$ (0.68)	$ (0.48)
Diluted earnings per share	$ (0.68)	$ (0.48)

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Noncash Share-based Compensation (Details)	3 Months Ended
	Mar. 31, 2016 USD ($) $ / shares shares
Noncash Share-based Compensation (Narrative) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	900,000
Shares available for future grants	1,749,726
Unrecognized compensation cost related to share-based compensation | $	$ 41,916,000
Weighted average period to recognize cost, in years	2 years 4 months 12 days
Share-based compensation arrangement by share-based payment, Minimum Employee Subscription rate	1.00%
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate	10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date	5.00%
Maximum Amount Contributable by employees under ESPP- Half yearly | $	$ 5,000
Maximum Amount Contributable By Employees Under ESPP- Annually | $	$ 10,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans	23,848
ESPP contributions by Employees | $	$ 369,000
RSUs
Noncash Share-based Compensation (Narrative) [Line Items]
Awards, other than options, granted in period	552,382
Weighted average grant date fair value, per share, of awards granted in period | $ / shares	$ 11.71
MSUs
Noncash Share-based Compensation (Narrative) [Line Items]
Awards, other than options, granted in period	152,500
Weighted average grant date fair value, per share, of awards granted in period | $ / shares	$ 14.29
Employee Stock [Member]
Noncash Share-based Compensation (Narrative) [Line Items]
Shares reserved for issuance under Plan	425,155
2007 Equity Incentive Plan [Member]
Noncash Share-based Compensation (Narrative) [Line Items]
Shares reserved for issuance under Plan	9,968,000

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Noncash Share-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 5,384	$ 7,745
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	599	1,013
Selling and Marketing Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	1,780	2,032
General and Administrative Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	1,730	3,348
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	1,275	1,352
Operating Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 4,785	$ 6,732

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Convertible debt (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) $ / shares	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Debt Issuance Cost	$ 4,300
Convertible debt, issuance cost, equity component	$ 1,200
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	2.00%
Debt Instrument, Convertible, Conversion Ratio	29.5972
Debt Instrument, Convertible, Stock Price Trigger | $ / shares	$ 33.79
Debt Instrument, Face Amount	$ 143,750			$ 143,750
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	26,322			27,890
Convertible Debt, Noncurrent	117,428			115,860
Debt Instrument, Convertible, Carrying Amount of Equity Component	28,714			28,714
Debt Instrument, Periodic Payment, Interest	719	$ 719
Amortization of Financing Costs	204	195
Amortization of Debt Discount (Premium)	1,364	1,271
Interest Expense, Debt	2,287	$ 2,185
Debt Instrument, Fair Value Disclosure	$ 90,279			$ 114,122
Purchase of convertible bond hedge			$ (29,411)
Investment Warrants, Exercise Price | $ / shares	$ 45.48
Proceeds from Issuance of Warrants			$ 17,106

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Commitments and Contingencies Future minimum lease payments (Details) $ in Thousands	Mar. 31, 2016 USD ($)
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 1,873
Operating Leases, Future Minimum Payments, Due in Two Years	1,381
Operating Leases, Future Minimum Payments, Due in Three Years	868
Operating Leases, Future Minimum Payments, Due in Four Years	788
Operating Leases, Future Minimum Payments, Due in Five Years	802
Operating Leases, Future Minimum Payments, Due Thereafter	400
Operating Leases, Future Minimum Payments Due	$ 6,112