PROS (PRO) 10-K 15 Feb 17 2016 Q4 Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Feb. 09, 2017	Jun. 30, 2016
Entity Information [Line Items]
Entity Registrant Name	PROS HOLDINGS, INC.
Entity Central Index Key	1,392,972
Document Type	10-K
Document Period End Date	Dec. 31, 2016
Amendment Flag	false
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q4
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		30,877,466
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Public Float			$ 357,685,666

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 118,039	$ 161,770
Short-term Investments	15,996	2,500
Accounts and unbilled receivables, net of allowance of $760 and $586, respectively	33,285	39,115
Prepaid and other current assets	6,337	7,540
Total current assets	173,657	210,925
Property and equipment, net	15,238	15,777
Intangible Assets, Net (Excluding Goodwill)	12,650	14,191
Goodwill	20,096	20,445
Other long term assets, net	6,013	1,873
Total assets	227,654	263,211
Current liabilities:
Accounts payable	2,744	8,273
Accrued liabilities	7,279	4,333
Accrued payroll and other employee benefits	18,349	13,084
Deferred revenue	68,349	60,664
Total current liabilities	96,721	86,354
Long-term deferred revenue	11,389	4,665
Convertible Debt, Noncurrent	122,299	115,860
Other Liabilities, Noncurrent	639	918
Total liabilities	231,048	207,797
Commitments and contingencies (Note 15)
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; 35,001,236 and 34,156,561 shares issued, respectively; 30,583,651 and 29,738,976 shares outstanding, respectively	35	34
Additional paid-in capital	175,678	158,674
Treasury stock, 4,417,585 common shares, at cost	(13,938)	(13,938)
Retained earnings (Accumulated deficit)	(160,259)	(85,034)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(4,910)	(4,322)
Total stockholders' equity	(3,394)	55,414
Total liabilities and stockholders' equity	$ 227,654	$ 263,211

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Allowance for bad debts	$ 760,000	$ 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	35,001,236	34,156,561
Common stock - shares outstanding	30,583,651	29,738,976
Treasury stock - shares	4,417,585	4,417,585

Condensed Consolidated Statemen

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue:
License	$ 11,814	$ 32,716	$ 58,515
Services	34,739	42,875	49,225
Subscription	38,158	28,989	23,468
Total license, service and subscription revenue	84,711	104,580	131,208
Maintenance and support	68,565	63,666	54,621
Total revenue	153,276	168,246	185,829
Cost of revenue:
License	246	304	243
Cost of Services	32,047	36,147	39,955
Cost of Subscription	17,379	12,786	7,334
Cost of license, service and subscription	49,672	49,237	47,532
Maintenance and support	13,681	12,173	10,554
Cost of Revenue	63,353	61,410	58,086
Gross profit	89,923	106,836	127,743
Operating Expenses
Selling and Marketing Expense	63,980	74,146	64,528
General and Administrative Expense	38,537	38,517	35,389
Research and development	52,804	46,780	43,174
Business Combination, Acquisition Related Costs	0	0	3,019
Tangible Asset Impairment Charges	0	2,890	4,040
Income from operations	(65,398)	(55,497)	(22,407)
Other income (expense):
Convertible debt interest and amortization	(9,319)	(8,914)	(492)
Other Nonoperating Income (Expense)	(38)	(661)	(2,159)
Income before income tax provision	(74,755)	(65,072)	(25,058)
Income tax provision	470	739	12,493
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(75,225)	(65,811)	(37,551)
Net Income (Loss) Attributable to Noncontrolling Interest	0	0	(907)
Net Income (Loss) Attributable to Parent	$ (75,225)	$ (65,811)	$ (36,644)
Net earnings (loss) per share:
Basic	$ (2.47)	$ (2.23)	$ (1.27)
Diluted	$ (2.47)	$ (2.23)	$ (1.27)
Weighted average number of shares:
Basic	30,395	29,578	28,915
Diluted	30,395	29,578	28,915
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	$ (594)	$ (2,076)	$ (2,249)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	6	3	0
Other Comprehensive Income (Loss), Net of Tax	(588)	(2,073)	(2,249)
Other comprehensive income, net of tax:
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(75,813)	(67,884)	(39,800)
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest	0	0	(922)
Comprehensive income (loss)	$ (75,813)	$ (67,884)	$ (38,878)

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating activities:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (75,225)	$ (65,811)	$ (37,551)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, Depletion and Amortization	9,507	10,395	10,443
Amortization of Financing Costs and Discounts	6,439	6,039	329
Share-based compensation	20,466	27,864	22,665
Tax Benefit from Stock Options Exercised	0	0	(110)
Deferred income tax	40	165	12,638
Provision for doubtful accounts	174	(282)	(192)
Gain (Loss) on Disposition of Assets	19	167	0
Tangible Asset Impairment Charges	0	2,890	4,040
Changes in operating assets and liabilities:
Accounts and unbilled receivables	5,671	32,274	(14,026)
Prepaid expenses and other assets	(915)	229	(3,383)
Accounts payable	(2,905)	(4,049)	(3,104)
Accrued liabilities	2,801	800	(1,080)
Accrued payroll and other employee benefits	5,195	(2,048)	3,289
Deferred revenue	14,388	6,899	7,796
Net cash (used in) provided by operating activities	(14,345)	15,532	1,754
Investing activities:
Purchases of property and equipment	(7,241)	(6,794)	(7,499)
Payments to Acquire Other Investments	(2,000)	0	0
Capitalized Software Development Costs for Software Sold to Customers	(1,048)	(233)	(2,305)
Payments to Acquire Intangible Assets	(1,625)	0	0
Increase in restricted cash	0	100	39,718
Payments to Acquire Short-term Investments	(154,990)	(57,697)	0
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities	141,500	55,200	0
Net cash (used in) provided by investing activities	(25,404)	(9,424)	7,866
Financing activities:
Exercise of stock options	889	706	1,105
Proceeds from Stock Plans	1,090	839	335
Tax withholding related to net share settlement of restricted stock units	(5,467)	(5,124)	(13,089)
Noncontrolling Interest, Increase from Business Combination	0	0	(6,147)
Business combination, payment of contingent consideration	0	(1,304)	(2,225)
Repayments of Notes Payable	(196)	(263)	0
Proceeds from Convertible Debt	0	0	138,631
Proceeds from Issuance of Warrants	0	0	17,106
Purchase of convertible bond hedge	0	0	(29,411)
Payments of Debt Issuance Costs	0	(408)	0
Net cash (used in) provided by financing activities	(3,684)	(5,554)	106,305
Effect of Exchange Rate on Cash and Cash Equivalents	(298)	197	406
Net change in cash and cash equivalents	(43,731)	751	116,331
Cash and cash equivalents:
Beginning of period	161,770	161,019	44,688
End of period	118,039	161,770	161,019
Income Taxes Paid, Net	968	(3)	(233)
Interest Paid	(3,182)	(2,932)	(243)
Capital Expenditures Incurred but Not yet Paid	378	2,722	1,140
Cameleon Acquistion [Member]
Investing activities:
Payments to Acquire Businesses, Net of Cash Acquired	$ 0	$ 0	$ (22,048)

Consolidated Statement of Share

Consolidated Statement of Shareholders Equity - USD ($)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income, net of tax [Member]
Common stock - shares outstanding, beginning balance at Dec. 31, 2013		28,188,643
Stockholders' Equity Attributable to Parent at Dec. 31, 2013	$ 111,303,000	$ 33,000	$ 106,880,000	$ (13,938,000)	$ 18,328,000	$ 0
Treasury stock - shares, beginning balance at Dec. 31, 2013				4,417,585
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, New Issues		214,162
Exercise of stock options	1,105,000
Proceeds from Stock Options Exercised	1,105,000		1,105,000
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		644,028
Stock Issued During Period, Value, Restricted Stock Award, Gross	(13,088,000)	$ 1,000	(13,089,000)
Stock Issued During Period, Shares, Employee Stock Purchase Plans		13,392
Proceeds and Excess Tax Benefit from Share-based Compensation	(110,000)		(110,000)
Proceeds from Stock Plans	335,000		335,000
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	22,845,000		22,845,000
Proceeds from Issuance of Warrants	17,106,000		17,106,000
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	28,714,000		28,714,000
Change in equity - purchase of convertible bond hedge	(29,411,000)		(29,411,000)
Purchase of convertible bond hedge	29,411,000
Share-based Compensation	22,665,000
Other Comprehensive Income (Loss), Net of Tax	(2,249,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(2,249,000)					(2,249,000)
Net Income (Loss) Attributable to Parent	(36,644,000)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(37,551,000)				(37,551,000)
Net Income (Loss) Attributable to Noncontrolling Interest	(907,000)				(907,000)
Cumulative earnings previously allocated to NCI and re-allocated to Parent's equity	907,000				907,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2014	98,999,000	$ 34,000	134,375,000	$ (13,938,000)	(19,223,000)	(2,249,000)
Treasury stock - shares, ending balance at Dec. 31, 2014				4,417,585
Common stock - shares outstanding, ending balance at Dec. 31, 2014		29,060,225
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, New Issues		220,031
Proceeds from Stock Options Exercised	706,000		706,000
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		421,115
Stock Issued During Period, Value, Restricted Stock Award, Gross	(5,124,000)		(5,124,000)
Stock Issued During Period, Shares, Employee Stock Purchase Plans		37,605
Proceeds from Stock Plans	839,000		839,000
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	27,878,000		27,878,000
Proceeds from Issuance of Warrants	0
Purchase of convertible bond hedge	0
Share-based Compensation	27,864,000
Other Comprehensive Income (Loss), Net of Tax	(2,073,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(2,076,000)					(2,073,000)
Net Income (Loss) Attributable to Parent	(65,811,000)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(65,811,000)				(65,811,000)
Net Income (Loss) Attributable to Noncontrolling Interest	0
Stockholders' Equity Attributable to Parent at Dec. 31, 2015	$ 55,414,000	$ 34,000	158,674,000	$ (13,938,000)	(85,034,000)	(4,322,000)
Treasury stock - shares, ending balance at Dec. 31, 2015	4,417,585			4,417,585
Common stock - shares outstanding, ending balance at Dec. 31, 2015	29,738,976	29,738,976
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, New Issues		96,870
Proceeds from Stock Options Exercised	$ 889,000		889,000
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		682,112
Stock Issued During Period, Value, Restricted Stock Award, Gross	$ (5,466,000)	$ 1,000	(5,467,000)
Stock Issued During Period, Shares, Employee Stock Purchase Plans	65,693	65,693
Proceeds from Stock Plans	$ 1,090,000		1,090,000
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	20,492,000		20,492,000
Proceeds from Issuance of Warrants	0
Purchase of convertible bond hedge	0
Share-based Compensation	20,466,000
Other Comprehensive Income (Loss), Net of Tax	(588,000)					(588,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(594,000)
Net Income (Loss) Attributable to Parent	(75,225,000)				(75,225,000)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(75,225,000)
Net Income (Loss) Attributable to Noncontrolling Interest	0
Stockholders' Equity Attributable to Parent at Dec. 31, 2016	$ (3,394,000)	$ 35,000	$ 175,678,000	$ (13,938,000)	$ (160,259,000)	$ (4,910,000)
Treasury stock - shares, ending balance at Dec. 31, 2016	4,417,585			4,417,585
Common stock - shares outstanding, ending balance at Dec. 31, 2016	30,583,651	30,583,651

Organization and Nature of Oper

Organization and Nature of Operations	12 Months Ended
	Dec. 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 solutions to help accelerate sales, formulate winning pricing strategies and align product, demand and availability. PROS revenue and profit realization solutions are designed to allow customers to experience meaningful revenue growth, sustained profitability and modernized business processes. The Company provides its solutions to enterprises across the manufacturing, distribution, services, and travel industries, including automotive and industrial, business-to-business ("B2B") services, cargo, chemicals and energy, consumer goods, insurance, food and beverage, healthcare, high tech, 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.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	Summary of Significant Accounting Policies Principles of consolidation and basis of presentation The Consolidated Financial Statements include the accounts of the Company, and its wholly-owned subsidiaries. All significant intercompany transactions and balances have been eliminated in consolidation. The Consolidated Financial Statements of the Company have been prepared in accordance with generally accepted accounting principles in the United States ("GAAP"). 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’s management makes estimates and assumptions in the preparation of its audited Consolidated Financial Statements in conformity with GAAP. These estimates and assumptions may affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the audited Consolidated Financial Statements and the reported amounts of revenue and expense during the reporting periods. Actual results could differ from those estimates. The complexity of the estimation process and issues related to the assumptions, risks and uncertainties inherent in the application of the percentage-of-completion method of revenue recognition affects the amount of revenue, expenses, unbilled receivables and deferred revenue. Numerous internal and external factors can affect estimates. Estimates are also used for, but not limited to, receivables, allowance for doubtful accounts, useful lives of assets, depreciation and amortization, the fair value of assets acquired and liabilities assumed for business combinations, income taxes and deferred tax asset valuation, valuation of stock options, other current liabilities and accrued liabilities. Cash and cash equivalents The Company considers all highly liquid investments with an original maturity of three months or less at the time of purchase, or the ability to be settled in cash within a period of three months, to be cash equivalents, except for commercial paper which is classified as short-term investments. The Company has a cash management program that provides for the investment of excess cash balances, primarily in short-term money market instruments. Short-term investments The Company's investments are available-for-sale commercial paper and certificates of deposit that are recorded at fair value in the Consolidated Balance Sheets. The Company classifies all commercial paper regardless of original maturity at purchase price as investments. 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. 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 December 31, 2016 . Cost method investment Investments in equity securities of privately held companies without readily determinable fair value, where the Company does not exercise significant influence over the investee, are recorded using the cost method of accounting, carrying the investment at historical cost. If there are no identified events or changes in circumstances that might have an adverse effect on the cost method investments, the Company does not estimate the investments' fair value. For all investments, if a decline in the fair value of an investment below the carrying value is determined to be other-than-temporary, such investment is written down to its estimated fair value with a charge to current earnings. Financial instruments The carrying amount of the Company’s financial instruments, which include cash equivalents, short-term investments, receivables and accounts payable, and cost method investment approximates their fair values at December 31, 2016 and 2015 . For additional information on the Company’s fair value measurements, see Note 9 to the Consolidated Financial Statements. Allowance for doubtful accounts The Company maintains an allowance for doubtful accounts which reflects the Company's best estimate of potentially uncollectible receivables. The Company regularly reviews the receivables allowances by considering such factors as historical experience, credit-worthiness, the age of the receivable balances and current economic conditions that may affect a customer’s ability to pay and the Company specifically reserves for those deemed uncollectible. Prepaid expenses and other assets Prepaid expenses and other assets consist primarily of prepaid income taxes, deferred project costs and prepaid third-party license fees. Property and equipment, net Property and equipment are recorded at cost, less accumulated depreciation. Maintenance, repairs and minor replacements are charged to expense as incurred. Significant renewals and betterments are capitalized. Depreciation on property and equipment, with the exception of leasehold improvements, is recorded using the straight-line method over the estimated useful lives of the assets. Depreciation on leasehold improvements is recorded using the shorter of the lease term or useful life. When property is retired or disposed of, the cost and related accumulated depreciation are removed from the accounts and any resulting gains or losses are reflected in the Consolidated Statements of Comprehensive Income in the period of disposal. Internal-use software Costs incurred to develop internal-use software during the application development stage are capitalized, stated at cost, and depreciated using the straight-line method over the estimated useful lives of the assets. Application development stage costs generally include salaries and personnel costs and third-party contractor expenses associated with internal-use software development, configuration, coding and testing. Capitalization of such costs begins when the preliminary project stage is complete and ceases at the point in which the project is substantially complete and is ready for its intended purpose. Capitalized internal-use software is included in property and equipment, net in the Consolidated Balance Sheets. Deferred commissions Sales commissions earned by the Company's sales force are considered to be direct sales commissions when they are associated specifically with a non-cancellable subscription contract. Direct sales commissions are deferred when earned and amortized over the same period that revenues are recognized for the related non-cancellable subscription contract. 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 in the year ended December 31, 2016 . During the years ended December 31, 2015 and 2014 , the Company recorded a full impairment of $2.9 million and $4.0 million , respectively, related to capitalized internal-use software associated with the expected future cash flows. Intangible assets and goodwill Intangible assets that have finite lives are amortized over their useful lives and are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. During this review, the Company reevaluates the significant assumptions used in determining the original cost and estimated lives of long-lived assets. Although the assumptions may vary from asset to asset, they generally include operating results, changes in the use of the asset, cash flows and other indicators of value. Management then determines whether the remaining useful life continues to be appropriate or whether there has been an impairment of long-lived assets based primarily upon whether expected future undiscounted cash flows are sufficient to support the assets’ recovery. If impairment exists, the Company would adjust the carrying value of the asset to fair value, generally determined by a discounted cash flow analysis. Goodwill represents the excess of the purchase consideration over the net of the acquisition-date fair value of identifiable assets acquired, including identifiable intangible assets, and liabilities assumed in connection with business combinations. Goodwill is not amortized, but is assessed for impairment as of November 30 of each fiscal year, or more frequently if events or changes in circumstances indicate that the fair value of the Company’s reporting unit has been reduced below its carrying value. When conducting the annual goodwill impairment assessment, a three step process is used. The first step is to perform an optional qualitative evaluation as to whether it is more likely than not that the fair value of the Company’s reporting unit is less than its carrying value, using an assessment of relevant events and circumstances. In performing this assessment, the Company is required to make assumptions and judgments including but not limited to an evaluation of macroeconomic conditions as they relate to the business, industry and market trends, as well as the overall future financial performance of the reporting unit and future opportunities in the markets in which it operates. If it is determined that it is not more likely than not that the fair value of the reporting unit is less than its carrying value, no additional tests are required to be performed in assessing goodwill for impairment. However, if the Company concludes otherwise or elects not to perform the qualitative assessment, the Company performs a second step, consisting of a quantitative assessment of goodwill impairment. This quantitative assessment requires us to estimate the fair value of the reporting unit and compare the estimated fair value to its respective carrying value (including goodwill) as of the date of the impairment test. The third step, employed for the reporting unit failing the second step, is used to measure the amount of any potential impairment and compares the implied fair value of the reporting unit with the carrying amount of goodwill. Based on the results of the qualitative review of goodwill performed as of November 30, 2016, the Company did not identify any indicators of impairment. As such, the second and third steps described above were not necessary. Research and development Research and development costs for software sold to customers are expensed as incurred. These costs include salaries and personnel costs, including employee benefits, third-party contractor expenses, software development tools, an allocation of facilities and depreciation expenses and other expenses in developing new solutions and upgrading and enhancing existing solutions. Software development costs Capitalization of software development costs for software to be sold, leased, or otherwise marketed begins upon the establishment of technological feasibility, which is generally the completion of a working prototype that has been certified as having no critical bugs and is a release candidate. Amortization begins once the software is ready for its intended use, generally based on the pattern in which the economic benefits will be consumed. To date, software development costs incurred between completion of a working prototype and general availability of the related product have not been material. Treasury stock The Company is authorized to make treasury stock purchases in the open market pursuant to the share repurchase program, which was approved by its Board of Directors on August 28, 2008. The Company accounts for the purchase of treasury stock under the cost method. For additional information on the Company’s stock repurchase program, see Note 10 to the Consolidated Financial Statements. There were no treasury stock repurchases for the years ended December 31, 2016 , 2015 and 2014 . Revenue recognition The Company derives its revenues primarily from subscription services fees, professional services, the perpetual licensing of its software products and the associated software maintenance and support services. The Company has historically derived the majority of its revenue from the licensing of its software products, the related implementation and associated software maintenance and support. More recently, it has emphasized its offers of subscription services that do not require customers to host its solutions in their data centers. The Company commences revenue recognition when all of the following criteria are met: • there is persuasive evidence of an arrangement; • the service has been or is being provided to the customer; • collection of the fee is reasonably assured; and • the amount of fees to be paid by the customer is fixed and determinable. Subscription services revenue Subscription services revenue is generally recognized ratably over the contractual term of the arrangement beginning on the date that the Company's service is made available to the customer, assuming all other revenue recognition criteria have been met. The Company's subscription contracts do not provide customers with the right to take possession of the software supporting the applications and, as a result, are accounted for as service contracts. 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. For the Company's subscription services that include professional services, the Company determines whether the professional services have standalone value. Professional services deemed to have standalone value are accounted for separately from subscription services and the subscription services revenue recognition commences on the date that the Company's service is made available to the customer. If determined that the professional services do not have standalone value, the transaction is treated as a single element and the subscription services and professional services revenue is deferred until the customer commences use of the subscription services, and the subscription services revenue is recognized over the remaining term of the arrangement. Maintenance and support revenue 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. License revenue 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 upon software delivery, assuming all other revenue recognition criteria have been 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 revenue Professional services revenues are generally recognized as the services are rendered for time and material contracts, or on a proportional performance basis for fixed price contracts. The majority of the Company's professional services contracts are on a time and materials basis. Training revenues are recognized as the services are rendered. For the Company's subscription services that include professional services, the Company determines whether the professional services have standalone value. Professional services deemed to have standalone value are accounted for separately from subscription services and typically recognized as the services are performed. If determined that the professional services do not have standalone value, the transaction is treated as a single element, the professional services revenue is deferred until the customer commences use of the subscription services, and the professional services revenue is recognized over the remaining term of the arrangement. For software license arrangements that include professional services, the Company determines 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. For professional services considered essential to the functionality of the software, 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. Multiple element arrangements For arrangements with multiple deliverables, the Company evaluates whether the individual deliverables qualify as separate units of accounting. In order to treat deliverables in a multiple deliverable arrangement as separate units of accounting, the deliverables must have standalone value upon delivery. If the deliverables have standalone value upon delivery, the Company accounts for each deliverable separately and revenue is recognized for the respective deliverables as they are delivered. When multiple deliverables included in an arrangement are separable into different units of accounting, the arrangement consideration is allocated to the identified separate units of accounting based on their relative selling price. Multiple deliverable arrangement accounting guidance provides a hierarchy when determining the relative selling price for each unit of accounting. VSOE of selling price, based on the price at which the item is regularly sold by the vendor on a standalone basis, should be used if it exists. If VSOE of selling price is not available, third-party evidence ("TPE") of selling price is used to establish the selling price if it exists. If neither VSOE nor TPE exist for a deliverable, arrangements with multiple deliverables can be separated into discrete units of accounting based on the Company's best estimate of selling price ("BESP"). The amount of arrangement fee allocated is limited by contingent revenues, if any. 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, the Company 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 standalone 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. For multiple-element arrangements that contain software and nonsoftware elements such as its subscription services, 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 utilize VSOE of fair value if it exists. The Company applies the residual method to recognize revenue for the delivered elements in standalone 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. 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. Foreign currency The Company has contracts denominated in foreign currencies and therefore a portion of the Company’s revenue is subject to foreign currency risks. Gains and losses from foreign currency transactions, such as those resulting from the settlement of receivables, are classified in other expense, net included in the accompanying Consolidated Statements of Comprehensive Income (Loss). The functional currency of PROS France SAS ("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 income (loss) as a component of stockholders’ equity. Noncash share-based compensation The Company has two noncash share-based compensation plans, the 1999 Equity Incentive Plan ("1999 Stock Plan") and the 2007 Equity Incentive Plan ("2007 Stock Plan"), which authorize the discretionary granting of various types of stock awards to key employees, officers, directors and consultants. The 1999 Stock Plan was terminated in March 2007 for purposes of granting any future equity awards. The 2007 Stock Plan was adopted in March 2007. The Company may provide noncash share-based compensation through the grant of: (i) restricted stock awards; (ii) restricted stock unit awards - time, performance and market-based ("RSUs"); (iii) stock options; (iv) stock appreciation rights ("SARs"); (v) phantom stock; and (vi) performance awards. Also in February 2014, the Company granted inducement awards in an aggregate amount of up to 308,250 shares in accordance with NYSE Rule 303A.08. These inducement awards were in the form of RSUs and market stock units ("MSUs") granted to the Company's former Chief Operating Officer and RSUs granted to certain new employees in connection with the acquisitions of PROS France and SignalDemand Inc. To date, the Company has granted stock options, stock appreciation rights, restricted stock units, time-based, performance-based and market-based, and market stock units. The Company issues common stock from its pool of authorized stock upon exercise of stock options, settlement of stock appreciation rights and market stock units or upon vesting of restricted stock units. The following table presents the number of awards outstanding for each award type as of December 31, 2016 and 2015 (in thousands): Year Ended December 31, Award type 2016 2015 Stock options 734 829 Restricted stock units (time-based) 2,237 1,915 Restricted stock units (performance-based) — 24 Restricted stock units (market-based) 460 — Stock appreciation rights 515 522 Market stock units 342 563 Stock options. The Company did not grant stock options during 2016 and 2015 . The fair value of each stock option was estimated on the date of grant using the Black-Scholes option pricing model. Restricted stock units. The fair value of the RSUs (time-based and performance-based) is based on the closing price of the Company’s stock on the date of grant and is amortized over the vesting period. RSUs include (i) time-based awards, (ii) performance-based awards in which the number of shares that vest are based upon satisfying certain conditions from binding customer agreements for the provision of configure, price, and quote ("CPQ") solutions, and (iii) market-based awards in which the number of shares that vest are based upon attainment of target average per share closing price over a requisite trading period. Market-based RSUs vest if the average trailing closing price of the Company's Common Stock meets certain minimum performance hurdles for at least 105 calendar days prior to September 9, 2020, with 25% vesting at $27 , an additional 25% vesting at $33 , and the remaining 50% vesting at $41 . The Company estimates the fair value and the derived service period of the market-based RSUs on the date of grant using a Monte Carlo simulation model. The model requires the use of a number of assumptions including the expected volatility of the Company's stock, its risk-free interest rate and expected dividends. The Company's expected volatility at the date of grant is based on the historical volatility of the Company over the performance period. Stock appreciation rights. SARs will be settled in stock at the time of exercise and vest over four years from the date of grant. The Company used the Black-Scholes option pricing model to estimate the fair value of its SARs. The determination of the fair value of SARs utilizing the Black-Scholes model is affected by the Company’s stock price and a number of assumptions, including expected volatility, expected life, deliver risk-free interest rate and expected dividends. The Company estimates the expected volatility of common stock at the date of grant based on a combination of its historical volatility and the average volatility of comparable companies. The expected life of the SARs noncash share-based payment awards is a historical weighted average of the expected lives of similar securities of comparable public companies. The risk-free interest rate assumption is based on observed interest rates appropriate for the terms of the Company’s awards. The dividend yield assumption is based on the Company's expectation of paying no dividends. Market stock units. MSUs are performance-based awards that vest based upon the Company’s relative shareholder return. The actual number of MSUs that will be eligible to vest is based on the total shareholder return of the Company relative to the total shareholder return of the Russell 2000 Index ("Index") over a three year period ending December 31, 2015, December 31, 2016, December 31, 2017, March 2, 2018 and February 28, 2019 ("Performance Period"), respectively. The MSUs vest on January 1, 2016, January 1, 2017, January 1, 2018, March 3, 2018 and March 1, 2019, respectively. The maximum number of shares issuable upon vesting is 200% of the MSUs initially granted based on the average price of the Company's common stock relative to the Index during the Performance Period. 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 volatility 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. As the Company issues stock options and SARs, it evaluates the assumptions used to value its stock option awards and SARs. If factors change and the Company employs different assumptions, noncash share-based compensation expense may differ significantly from what has been recorded in the past. If there are any modifications or cancellations of the underlying unvested securities, the Company may be required to accelerate, increase or cancel any remaining unearned noncash share-based compensation expense. Future noncash share-based compensation expense and unearned noncash share-based compensation will increase to the extent that the Company grants additional equity awards to employees. At December 31, 2016 , there were an estimated $33.8 million of total unrecognized compensation costs related to noncash share-based compensation arrangements. These costs will be recognized over a weighted average period of 2.2 years. For further discussion of the Company’s noncash share-based compensation plans, see Note 11 to the Consolidated Financial Statements. Product warranties For software-as-a-service application subscriptions, the Company generally issues a product warranty for the subscription term, depending on the contract. For on-premise software licenses, the Company generally issues a product warranty for 90 days following the first use of the software in a production environment, depending on the contract. In the Company’s experience, warranty costs have been insignificant. Income taxes The Company uses the asset and liability method to account for income taxes, including recognition of deferred tax assets and liabilities for the anticipated future tax consequences attributable to differences between financial statement amounts and their respective tax basis. The Company reviews its deferr

Business Combination

Business Combination	12 Months Ended
	Dec. 31, 2016
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	Business Combination Cameleon Software SA In October 2013, the Company entered into a tender offer agreement with Cameleon Software SA (now PROS France, and referred to in this subsection 3 as "Cameleon"), indicating the Company's intent to acquire Cameleon through the tender offer for all of the outstanding share capital of Cameleon in an all cash tender offer. In January 2014, the Company announced that the initial tender offer for Cameleon was successful and upon completion of the initial tender offer, the Company controlled 81.7% of Cameleon’s common stock and 94.0% of Cameleon’s outstanding warrants, inclusive of the commitments from Cameleon's management regarding their Cameleon free shares. As a result of shares purchased by the Company in the market following the completion of the tender, the Company's exercise of Cameleon warrants in July 2014, and the Company's completion of a second tender in November 2014, the Company now controls 100% of Cameleon's common stock. The Company acquired Cameleon for total cash consideration of approximately $32 million , net of cash acquired. During the year ended December 31, 2014, the Company incurred acquisition-related costs of $1.7 million , consisting primarily of the cost for the retention of key employees, and advisory and legal fees. The Company recorded revenue for Cameleon of approximately $11.9 million in the consolidated statement of operations from the acquisition date through December 31, 2014. All of the assets acquired and the liabilities assumed in the transaction have been recognized at their acquisition date fair values at January 8, 2014. The acquisition initially resulted in $16.2 million of goodwill. During the year ended December 31, 2014, the fair value of the other tangible assets and liabilities was increased and resulted in a net change in goodwill of $0.5 million . The allocation of the purchase price for Cameleon is updated as follows (in thousands): Cash and cash equivalents $ 7,086 Accounts receivable 10,395 Prepaid and other assets 1,418 Intangible assets 18,653 Goodwill 15,717 Accounts payable and accrued liabilities (12,539 ) Deferred revenue (5,392 ) Non-controlling interest (6,204 ) Net assets acquired $ 29,134 The following are the identifiable intangible assets acquired and their respective useful lives (in thousands): Useful Life Amount (years) Trade Name $ 1,020 8 Customer Relationships 1,455 2-5 Maintenance Relationships 3,808 8 Developed Technology 11,147 7 Other 1,223 2 Total $ 18,653 In performing the purchase price allocation, the Company considered, among other factors, its anticipated future use of the acquired assets, analysis of historical financial performance, and estimates of future cash flows from Cameleon's products and services. The allocation resulted in acquired intangible assets of $18.7 million . The acquired intangible assets consisted of developed technology, customer and maintenance relationships, trade name and other and were valued using the income approach in which the after-tax cash flows are discounted to present value. The cash flows are based on estimates used to price the transaction, and the discount rates applied were benchmarked with reference to the implied rate of return from the transaction model as well as the weighted average cost of capital. Additionally, the Company assumed certain liabilities in the acquisition, including deferred revenue to which a fair value of $5.4 million was ascribed using a cost-plus profit approach. Liabilities assumed include $2.7 million related to the Company's offer to pay an additional €0.15 per share cash premium to the Cameleon stock and warrant holders tendering their shares and warrants in the initial tender offer if the Company acquired at least 95% of the share capital and voting rights of Cameleon on a fully diluted basis on or before December 31, 2014. The Company recorded this liability at fair value as the Company expected to meet this threshold prior to December 31, 2014 and ultimately settled the contingent liability related to the share premium in December 2014 for $2.2 million . In addition, the net assets acquired include contingent consideration of $1.4 million related to the committed purchase of free shares owned by Cameleon management which was settled in September 2015 for $1.3 million . Goodwill of $15.7 million represents the excess of the purchase price over the fair value of the underlying net tangible and identifiable intangible assets, and represents the expected synergistic benefits of the transaction, the knowledge and experience of Cameleon's workforce in place, and the expectation that the combined company’s complementary products will significantly broaden the Company’s CPQ solution offering. The Company believes the combined company will benefit from a broader global presence and, with the Company’s direct sales force and larger channel coverage, significant cross selling opportunities. Intangibles and goodwill of $5.8 million are expected to be currently deductible for tax purposes. In accordance with GAAP, goodwill is not amortized but instead is tested for impairment at least annually, or, more frequently if certain indicators are present. In the event that the management of the combined company determines that the value of goodwill has become impaired, the combined company will incur an accounting charge for the amount of the impairment during the fiscal quarter in which the determination is made. Pro Forma Financial Information The unaudited financial information in the table below summarizes the combined results of operations of the Company and Cameleon, on a pro forma basis, as though the Company had acquired Cameleon on January 1, 2013. The pro forma information for all periods presented also includes the effect of business combination accounting resulting from the acquisition, including amortization charges from acquired intangible assets. Year Ended December 31, (in thousands) 2014 Total revenue $ 186,081 Net loss attributable to PROS Holdings, Inc. (36,776 ) Earnings per share - basic and diluted $ (1.27 )

Noncontrolling interest (Notes)

Noncontrolling interest (Notes)	12 Months Ended
	Dec. 31, 2016
Noncontrolling Interest [Abstract]
Noncontrolling Interest Disclosure [Text Block]	Non-controlling interest The following table presents a rollforward of the non-controlling interest from the date of acquisition of PROS France on January 8, 2014 through December 31, 2014 (in thousands): Beginning balance as of January 8, 2014 $ 6,204 Change in Parent's ownership in the subsidiary, net of cumulative earnings previously allocated to NCI and re-allocated to Parent's equity (5,282 ) Net loss allocated to non-controlling interest (907 ) Foreign currency translation adjustment (15 ) Ending balance as of December 31, 2014 $ — The Company controlled 100% of PROS France as of December 31, 2014 and there were no activities or outstanding balance related to non-controlling interest for the years ended December 31, 2015 and 2016 .

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets [Abstract]
Goodwill and Intangible Assets Disclosure [Text Block]	Goodwill and Intangible Assets The change in the carrying amount of goodwill for the years ended December 31, 2016 and 2015 , was as follows (in thousands): Balance as of December 31, 2014 $ 21,563 Foreign currency translation adjustments (1,118 ) Balance as of December 31, 2015 20,445 Foreign currency translation adjustments (349 ) Balance as of December 31, 2016 $ 20,096 The goodwill balance related to PROS France is denominated in local currency. Intangible assets consisted of the following as of December 31, (in thousands): December 31, 2016 Weighted average useful life (years) Gross Carrying Amount Accumulated Amortization* Net Carrying Amount Developed technology 7 $ 13,223 $ 5,671 $ 7,552 Internally developed technology and other 2 1,106 1,106 — Maintenance Relationship 8 3,346 1,755 1,591 Customer relationships 7 4,736 2,854 1,882 Trade name 2 829 829 — Acquired technology 4 1,625 — 1,625 Total $ 24,865 $ 12,215 $ 12,650 *Cumulative foreign currency translation adjustments, reflecting movement in the currencies of the underlying entities, decreased total intangible assets by approximately $0.2 million as of December 31, 2016 . December 31, 2015 Weighted average useful life (years) Gross Carrying Amount Accumulated Amortization* Net Carrying Amount Developed technology 7 $ 14,567 $ 4,897 $ 9,670 Internally developed technology and other 2 1,254 1,245 9 Maintenance Relationship 8 3,591 1,527 2,064 Customer relationships 7 4,853 2,405 2,448 Trade name 2 952 952 — Total $ 25,217 $ 11,026 $ 14,191 *Cumulative foreign currency translation adjustments, reflecting movement in the currencies of the underlying entities, decreased total intangible assets by approximately $1.2 million as of December 31, 2015 . Customer relationships are amortized over a period ranging from two to eight years. In the third quarter of 2015, the Company determined that the original strategy for the trade name of 'Cameleon Software SA' had changed which caused a change in estimate related to the useful life of the asset and the amortization related to this intangible asset was accelerated and fully recognized at that time. In December 2016, the Company purchased a technology-based intangible asset in connection with the equity securities investment made during the same period. The Company estimates that the intangible will be amortized approximately over 4 year period. Intangible asset amortization expense for the years ended December 31, 2016 , 2015 and 2014 was $3.0 million , $4.8 million and $5.2 million , respectively. As of December 31, 2016 , the expected future amortization expense for the acquired intangible assets for each of the five succeeding years and thereafter was as follows (in thousands): Year Ending December 31, Amount 2017 $ 2,780 2018 3,155 2019 3,045 2020 3,015 2021 648 2022 and thereafter 7 Total amortization expense $ 12,650

Accounts Receivable and Contrac

Accounts Receivable and Contracts in Progress	12 Months Ended
	Dec. 31, 2016
Accounts Receivable and Contracts in Progress [Abstract]
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	Accounts receivable and contracts in progress Accounts receivable at December 31, 2016 and 2015 , consists of the following (in thousands): December 31, 2016 2015 Accounts receivable $ 31,722 $ 36,539 Unbilled receivables 2,323 3,162 Total receivables 34,045 39,701 Less: Allowance for doubtful accounts (760 ) (586 ) Accounts receivable, net $ 33,285 $ 39,115 The bad debt expense reflected in general and administrative expenses in the accompanying Consolidated Statements of Comprehensive Income for the years ended December 31, 2016 , 2015 and 2014 , totaled approximately $0.2 million , $(0.3) million and $(0.1) million , respectively. Activity related to contracts in progress at December 31, 2016 and 2015 , is summarized as follows (in thousands): December 31, 2016 2015 Costs and estimated earnings recognized to date $ 470,239 $ 415,172 Progress billings to date (547,654 ) (477,339 ) Total $ (77,415 ) $ (62,167 ) The foregoing table reflects the aggregate invoiced amount of all contracts in progress and maintenance as of the respective dates, including amounts that have already been collected. These amounts are included in the accompanying Consolidated Balance Sheets at December 31, 2016 and 2015 , as follows (in thousands): December 31, 2016 2015 Unbilled receivables $ 2,323 $ 3,162 Deferred revenue (79,738 ) (65,329 ) Total $ (77,415 ) $ (62,167 ) At December 31, 2016 and 2015 , the Company had approximately $25.1 million and $23.1 million , respectively, in deferred maintenance and support revenue, and $36.6 million and $18.9 million , respectively in deferred subscription revenue both of which are reflected above within deferred revenue and progress billing.
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	Accounts receivable at December 31, 2016 and 2015 , consists of the following (in thousands): December 31, 2016 2015 Accounts receivable $ 31,722 $ 36,539 Unbilled receivables 2,323 3,162 Total receivables 34,045 39,701 Less: Allowance for doubtful accounts (760 ) (586 ) Accounts receivable, net $ 33,285 $ 39,115

Earnings per Share

Earnings per Share	12 Months Ended
	Dec. 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 Year Ended December 31, 2016 2015 2014 Numerator: Net loss attributable to PROS Holdings, Inc. $ (75,225 ) $ (65,811 ) $ (36,644 ) Denominator: Weighted average shares (basic) 30,395 29,578 28,915 Dilutive effect of stock options, restricted stock units and stock appreciation rights — — — Weighted average shares (diluted) 30,395 29,578 28,915 Basic earnings per share $ (2.47 ) $ (2.23 ) $ (1.27 ) Diluted earnings per share $ (2.47 ) $ (2.23 ) $ (1.27 ) 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 1.8 million , 2.2 million and 2.0 million for the years ended December 31, 2016 , 2015 and 2014 , respectively. Basic shares were used to calculate loss per share for the years ended December 31, 2016 , 2015 and 2014 . Since the Company intends to settle the principal amount of its Senior Notes (see Note 13) 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.

Property and Equipment, net

Property and Equipment, net	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment Disclosure [Text Block]	Property and equipment, net Property and equipment, net as of December 31, 2016 and 2015 consists of the following: December 31, Estimated useful life 2016 2015 Furniture and fixtures 5-10 years $ 2,934 $ 2,869 Computers and equipment 3-5 years 20,321 19,069 Software 3-6 years 5,907 5,238 Capitalized internal-use software development costs 3 years 1,078 — Leasehold improvements Shorter of lease term or useful life 5,601 5,613 Construction in progress 98 55 Property and equipment, gross 35,939 32,844 Less: Accumulated depreciation and amortization (20,701 ) (17,067 ) Property and equipment, net $ 15,238 $ 15,777 Depreciation and amortization was approximately $6.4 million , $5.5 million and $5.0 million for the years ended December 31, 2016 , 2015 and 2014 , respectively. During the years ended December 31, 2016 , 2015 and 2014 , the Company disposed of approximately $2.3 million , $4.4 million and zero , respectively, of fully depreciated assets. During the years ended December 31, 2016 and 2015 , the Company recognized an immaterial amount and $0.2 million of loss on disposal of certain non-fully depreciated assets, respectively. No gain or loss on disposal of assets was recognized for the year ended December 31, 2014 . As of December 31, 2016 and 2015 , the Company had approximately $9.3 million and $4.1 million , respectively, of fully depreciated assets in use. During the years ended December 31, 2016 and 2015 , the Company capitalized internal-use software development costs of approximately $1.1 million and $0.3 million , respectively, related to its subscription solutions. As of December 31, 2016 and 2015 , no capitalized internal-use software development costs were subject to amortization and no capitalized internal-use software development costs was included in accumulated depreciation and amortization for the years ended December 31, 2016 and 2015 . No impairment was recorded for the year ended December 31, 2016 . During the years ended December 31, 2015 and 2014 , the Company recorded $2.9 million and $4.0 million of impairment charges related to internally developed software. The impairments resulted from a reduction of projected cash flows for product groups based on revisions to the Company's projections during the year and were recorded to reduce the carrying value to fair value. The impairment in 2015 was triggered by a change in product strategy which resulted in a reduction in projected cash flows. The impairment in 2014 was triggered by the integration of the products acquired from the Company's acquisitions, which resulted in a reduction in projected cash flows.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Text Block]	Fair value measurements The Company adopted fair value measurements guidance for financial and nonfinancial assets and liabilities. The guidance defines fair value, establishes a framework for measuring fair value in GAAP and expands disclosures about fair value measurements. The guidance defines fair value as the price that would be received to sell an asset, or paid to transfer a liability, in an orderly transaction between market participants. The guidance establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows: Level 1 : Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2 : Quoted prices for similar assets or liabilities in markets that are not active or inputs which are observable, either directly or indirectly, for substantially the full term of the asset or liability; and Level 3 : Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity). A portion of the Company’s existing cash and cash equivalents are invested in short-term interest bearing obligations with original maturities less than 90 days, principally various types of money market funds. In addition, the Company had short-term investments consisting of commercial papers and certificate of deposit. The Company does not enter into investments for trading or speculative purposes. At December 31, 2016 and 2015 , the Company had approximately $106.3 million and $127.2 million invested in treasury money market funds. The fair value of the treasury money market funds 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 Company's short-term investments that are measured at fair value are comprised of $10.0 million and $2.5 million invested in available-for-sale commercial paper as of December 31, 2016 and 2015 , respectively, and $6.0 million and zero invested in certificate of deposit at December 31, 2016 and 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's diversified money market funds, treasury money market funds and short-term investments have a fair value that is not materially different from its carrying amount. The Company recorded an immaterial amount of unrealized gain related to the short-term investments for the years ended December 31, 2016 and 2015 . Reclassification adjustments for realized gain (loss) on available-for-sale securities in net income were immaterial for the years ended December 31, 2016 and 2015 . The fair value of the Company's Senior Notes is classified in the level 2 hierarchy. See Note 13 for further detail regarding the Senior Notes. In December 2016, the Company purchased $2.0 million equity securities in a privately held company. This investment is accounted for under the cost method and the Company measures it at fair value on a nonrecurring basis when it is deemed to be other-than-temporarily impaired. The Company estimates fair value of its cost method investment considering available information such as pricing in recent rounds of financing, current cash positions, earnings and cash flow forecasts, recent operational performance and any other readily available market data, which represents level 3 in the fair value hierarchy. An impairment charge to current earnings is recorded when the cost of the investment exceeds its fair value and this condition is determined to be other-than-temporary. As of December 31, 2016 , the Company determined there were no other-than-temporary impairments on its cost method investment.

Stockholders Equity

Stockholders Equity	12 Months Ended
	Dec. 31, 2016
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	Stockholders’ equity Stock repurchase On August 25, 2008, the Company’s Board of Directors approved a stock repurchase program that authorized the Company to purchase up to $15.0 million of the Company’s outstanding shares of common stock. Under the board-approved repurchase program, share purchases may be made from time to time in the open market or through privately negotiated transactions depending on market conditions, share price, trading volume and other factors, and such purchases, if any, will be made in accordance with applicable insider trading and other securities laws and regulations. These repurchases may be commenced or suspended at any time or from time to time without prior notice. The Company did not repurchase any shares under this plan for the years ended December 31, 2016 and 2015 . The remaining amount available to purchase common stock under this plan was $10.0 million as of December 31, 2016 .

Noncash Share-based Compensatio

Noncash Share-based Compensation	12 Months Ended
	Dec. 31, 2016
Noncash Share-based Compensation [Abstract]
Noncash Share-based Compensation	Noncash share-based compensation Employee noncash share-based compensation plans The Company has two noncash share-based compensation plans; the 1999 Stock Plan and the 2007 Stock Plan. These plans authorize the discretionary granting of various types of stock awards to key employees, officers, directors and consultants. The discretionary issuance of stock awards generally contains vesting provisions ranging from one to four years. 1999 Stock Plan . Under the 1999 Stock Plan, the Company is authorized to grant options to purchase shares of common stock to its employees, directors and consultants at the Company’s discretion. The Company’s 1999 Stock Plan was terminated in March 2007 for purposes of granting any future equity awards. There were no issued and outstanding stock options to purchase shares of the Company’s common stock under the 1999 Stock Plan as of December 31, 2016 . All outstanding options were exercised during the year ended December 31, 2015 and there were no outstanding options remaining as of December 31, 2016 . 2007 Stock Plan. The Company’s 2007 Stock Plan was adopted in March 2007. The purpose of the 2007 Stock Plan is to promote the Company’s long-term growth and profitability. The 2007 plan is intended to make available incentives that will help the Company to attract, retain and reward employees whose contributions are essential to its success. Under the 2007 Stock Plan, the Company’s employees, officers, directors and other individuals providing services to the Company or any of its affiliates are eligible to receive awards. The 2007 Stock Plan has an evergreen provision that allows for an annual increase equal to the lesser of (i) 3.5% of the Company’s outstanding shares, (ii) 900,000 shares, or (iii) any lesser amount determined by the Compensation Committee of the Board of Directors. The Company may provide these incentives through the grant of: (i) restricted stock awards; (ii) restricted stock unit awards; (iii) stock options; (iv) stock appreciation rights; (v) phantom stock; and (vi) performance awards. In January 2016, the Company increased the number of shares available to grant by 900,000 under the evergreen provision in the Company’s 2007 Stock Plan, increasing the number of shares reserved for issuance to 9,968,000 . As of December 31, 2016 , the Company had outstanding equity awards to acquire 4,280,965 shares of its common stock held by the Company’s employees, directors and consultants under the 2007 Stock Plan. Included in the outstanding equity awards are 734,289 of stock options, 2,689,860 RSUs, 514,716 SARs and 342,100 MSUs held by the Company’s employees, directors and consultants. As of December 31, 2016 , 774,967 shares remain available for grant under the 2007 Stock Plan. As of December 31, 2016 , there were no restricted stock awards or phantom stock issued under the 2007 Stock Plan. In February 2014, the Company granted inducement awards in an aggregate amount of up to 308,250 shares in accordance with NYSE Rule 303A.08. These inducement awards were in the form of RSUs and MSUs granted to the Company's former Chief Operating Officer and RSUs granted to certain new employees in connection with the acquisitions of PROS France and SignalDemand, Inc. As of December 31, 2016 , the Company had outstanding equity inducement awards to acquire 7,500 shares of its common stock held by the Company's employees and officers, all of which were time-based RSUs. Noncash share-based compensation expense for all noncash share-based payment awards granted is determined based on the grant-date fair value of the award. The Company recognizes compensation expense, net of estimated forfeitures, which represents noncash share-based awards expected to vest on a straight-line basis over the requisite service period of the award, which is generally the vesting term. Noncash share-based awards typically vest over four years. Stock options are generally granted for a ten-year term. The Company estimates forfeiture rates based on its historical experience for grant years where the majority of the vesting terms have been satisfied. Changes in estimated forfeiture rates are recognized through a cumulative catch-up adjustment in the period of change and thus impact the amount of noncash share-based compensation expense to be recognized in future periods. Noncash share-based compensation expense is allocated to expense categories on the Consolidated Statements of Comprehensive Income. The following table summarizes noncash share-based compensation expense, net of amounts capitalized, for the years ended December 31, 2016 , 2015 and 2014 (in thousands). For the Year Ended December 31, 2016 2015 2014 Share-based compensation: Cost of revenue $ 2,267 $ 3,719 $ 3,469 Operating expenses: Selling and marketing 3,824 8,536 6,514 General and administrative 9,040 10,293 8,003 Research and development 5,335 5,316 4,679 Total included in operating expenses 18,199 24,145 19,196 Total share-based compensation expense $ 20,466 $ 27,864 $ 22,665 At December 31, 2016 , there was an estimated $33.8 million of total unrecognized compensation costs related to noncash share-based compensation arrangements. These costs will be recognized over a weighted average period of 2.2 years. Stock options The following table summarizes the Company’s stock option activity for the year ended December 31, 2016 (number of shares and intrinsic value in thousands): Number of shares under option Weighted average exercise price Weighted average remaining contractual term (year) Aggregate intrinsic value (1) Outstanding, December 31, 2015 829 $ 12.06 Granted — — Exercised (95) 9.55 Forfeited — — Expired — — Outstanding, December 31, 2016 734 $ 12.38 0.86 $ 6,712 Vested and exercisable at December 31, 2016 734 $ 12.38 0.86 $ 6,712 (1) The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on December 31, 2016 of $21.52 and the grant date fair value. For the years ended December 31, 2016 and 2015 , respectively, the Company did not grant any stock options. The total intrinsic value of stock options exercised for the years ended December 31, 2016 , 2015 and 2014 was $1.0 million , $1.6 million and $4.5 million , respectively. RSUs (time-based and performance based) The Company has granted RSUs under the 2007 Stock Plan and as part of the February 2014 inducement awards grant. RSUs include both time-based awards as well as performance-based awards in which the number of shares that vest are based upon the revenue expected to be earned by the Company from binding customer agreements for the provision of CPQ solutions. Generally, the time-based RSUs granted to employees, directors and consultants vest in equal annual installments over a one to four year period from the grant date. The following table summarizes the Company's unvested time and performance-based RSUs as of December 31, 2016 , and changes during the year then ended (number of shares and intrinsic value in thousands): Number of shares Weighted average grant date fair value Weighted average remaining contractual term (year) Aggregate intrinsic value (1) Unvested at December 31, 2015 1,939 $ 26.75 Granted 1,353 11.69 Vested (884 ) 26.62 Forfeited (171 ) 20.21 Unvested at December 31, 2016 2,237 $ 18.05 2.41 $ 48,148 Expected to vest at December 31, 2016 2,162 $ 18.18 2.39 $ 46,516 (1) The aggregate intrinsic value was calculated based on the fair value of the Company’s common stock on December 31, 2016 of $21.52 . The weighted average grant-date fair value of the time and performance-based RSUs granted during the years ended December 31, 2016 , 2015 and 2014 was $11.69 , $25.29 and $33.46 , respectively. RSUs (market-based) During the year ended December 31, 2016 , the Company granted 460,000 RSUs with a market-based vesting condition to certain executive employees. These market-based RSUs will vest if the average trailing closing price of the Company's Common Stock meets certain minimum performance hurdles for at least 105 calendar days prior to September 9, 2020, with 25% vesting at $27 , an additional 25% vesting at $33 , and the remaining 50% vesting at $41 . The following table summarizes the Company's unvested market-based RSUs as of December 31, 2016 , and changes during the year then ended (number of shares and intrinsic value in thousands): Number of Weighted Weighted Aggregate Unvested at December 31, 2015 — $ — Granted 460 11.92 Vested — — Forfeited — — Unvested at December 31, 2016 460 $ 11.92 3.69 $ 9,899 Expected to vest at December 31, 2016 430 $ 11.92 3.69 $ 9,245 (1) The aggregate intrinsic value was calculated based on the fair value of the Company’s common stock on December 31, 2016 of $21.52 . The Company estimates the fair value and the derived service period of the market-based RSUs on the date of grant using a Monte Carlo simulation model. The model requires the use of a number of assumptions including the expected volatility of the Company's stock, its risk-free interest rate and expected dividends. The Company's expected volatility at the date of grant was based on the historical volatility of the Company over the performance period. The assumptions used to value the market-based RSUs granted during the year ended December 31, 2016 were as follows: December 31, 2016 Volatility 44.98% Risk-free interest rate 1.08% Dividend yield — The fair value of the market-based RSUs is expensed over the derived service period for each separate vesting tranche. The derived service period for the vesting tranches of the market-based RSUs ranges between 1.01 and 1.98 years. SARs The Company has granted SARs under the 2007 Stock Plan. The SARs will be settled in stock at the time of exercise and vest four years from the date of grant subject to the recipient’s continued employment with the Company. The number of shares issued upon the exercise of the SARs is calculated as the difference between the share price of the Company’s stock on the date of exercise and the date of grant multiplied by the number of SARs divided by the share price on the exercise date. The following table summarizes the Company's SARs activity for the year ended December 31, 2016 (number of shares and intrinsic value in thousands): Stock appreciation rights Weighted average exercise price Weighted average remaining contractual term (year) Aggregate intrinsic value (1) Outstanding, December 31, 2015 522 $ 10.87 Granted — — Exercised (7 ) 11.42 Forfeited — — Expired — — Outstanding, December 31, 2016 515 $ 10.86 3.85 $ 5,487 Exercisable at December 31, 2016 515 $ 10.86 3.85 $ 5,487 Vested and expected to vest at December 31, 2016 515 $ 10.86 3.85 $ 5,487 (1) The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on December 31, 2016 of $21.52 and the exercise price of the underlying SARs. The Company did not grant SARs in 2016 , 2015 and 2014 . MSUs I n 2016 , 2015 and 2014 , the Company granted MSUs to certain executives and senior level employees under the 2007 Stock Plan as part of the 2014 inducement awards grant. The MSUs are performance-based awards that vest based upon the Company’s relative shareholder return. The actual number of MSUs that will be eligible to vest is based on the total shareholder return of the Company relative to the total shareholder return of the Index over the three year Performance Period. The MSUs vest on January 1, 2016, January 1, 2017, January 1, 2018, March 3, 2018 and March 1, 2019, respectively. The MSUs maximum number of shares issuable upon vesting is 200% of the MSUs initially granted. The following table summarizes the Company's MSUs activity for the year ended December 31, 2016 (number of shares and intrinsic value in thousands): Number of unvested awards Weighted average grant date fair value Weighted average remaining contractual term (year) Aggregate intrinsic value (1) Unvested at December 31, 2015 563 $ 41.55 Granted 153 14.29 Exercised (252 ) 40.58 Forfeited (122 ) 44.47 Expired — — Unvested at December 31, 2016 342 $ 29.06 1.23 $ 7,362 (1) The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on December 31, 2016 of $21.52 and the grant date fair value of the underlying MSUs. 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 Company did not estimate a forfeiture rate for the MSUs due to the limited size, the vesting period and nature of the grantee population and the lack of history of granting this type of award. Significant assumptions used in the Monte Carlo simulation model for MSUs granted during the years ended December 31, 2016 , 2015 and 2014 are as follows: For the Year Ended December 31, 2016 2015 2014 Volatility 44.06% 42.06% 50.86% Risk-free interest rate 1.04% 0.89% 0.68% Expected option life in years 2.93 2.95 2.88 Dividend yield — — — The assumptions related to fiscal years 2015 and 2014 are presented on weighted average basis for the various awards granted throughout the period. Employee stock purchase plan 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 year ended December 31, 2016 , the Company issued 65,693 shares under the ESPP. As of December 31, 2016 , 383,310 shares remain authorized and available for issuance under the ESPP. As of December 31, 2016 , the Company held approximately $0.8 million on behalf of employees for future purchases under the ESPP and this amount was recorded in accrued liabilities in the Company's Consolidated Balance Sheet.

Income Tax Disclosure

Income Tax Disclosure	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income taxes The income tax provision (benefit) consisted of the following for the years ended December 31, 2016 , 2015 and 2014 (in thousands): Year Ended December 31, 2016 2015 2014 Current: Federal $ 19 $ (51 ) $ (935 ) State and Foreign 402 621 790 421 570 (145 ) Deferred: Federal 51 159 12,334 State (2 ) 10 304 Income tax provision $ 470 $ 739 $ 12,493 The differences between the effective tax rates reflected in the total provision for income taxes and the U.S. federal statutory rate of 34% for the years ended December 31, 2016 , 2015 and 2014 , respectively, were as follows (in thousands): Year Ended December 31, 2016 2015 2014 Provision at the U.S. federal statutory rate $ (25,338 ) $ (22,124 ) $ (8,520 ) Increase (decrease) resulting from: State income taxes, net of federal taxes 3 74 49 Nondeductible expenses 457 1,195 653 Acquisition-related expense (4 ) (4 ) 434 Statutory to GAAP income adjustment (274 ) 119 990 Foreign Tax Expense 2 350 837 Nondeductible noncash share based compensation 604 2,201 1,784 Incremental benefits for tax credits (1,663 ) (1,947 ) (3,259 ) Change in tax rate/income subject to lower tax rates and other 49 (15 ) 19 Change in valuation allowance 26,634 20,890 19,506 Income tax provision $ 470 $ 739 $ 12,493 The Company’s effective tax rate was a provision of 1% , 1% and 50% for the years ended December 31, 2016 , 2015 and 2014 , respectively. During the year ended December 31, 2016 , the Company's effective tax rate was impacted primarily by a valuation allowance, nondeductible officer's compensation, foreign taxes, and other nondeductible expenses, partially offset by the R&E credit. As of December 31, 2016 and 2015 , the Company had an income tax receivable of approximately zero and $1.0 million , respectively, which is classified as prepaid and other current assets in the accompanying Consolidated Balance Sheets. The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and liabilities as of December 31, 2016 and 2015 are as follows (in thousands): Year Ended December 31, 2016 2015 Noncurrent deferred tax liability: Property and equipment $ (2,114 ) $ (2,417 ) Noncash share based compensation 8,053 10,378 State deferred 242 249 Capitalized software (1,591 ) (1,538 ) Amortization (2,187 ) (2,289 ) R&E tax credit carryforwards 6,852 5,696 Deferred revenue 2,265 923 Federal Net Operating Losses ("NOLs") 40,671 20,889 State NOLs 1,517 714 State Credits 1,348 1,348 Foreign NOLs 10,663 8,457 Foreign tax credit carryforward 1,795 1,257 Other 1,317 487 Total noncurrent deferred tax assets 68,831 44,154 Less: valuation allowance (69,049 ) (44,321 ) Total noncurrent deferred tax liability (218 ) (167 ) Total net deferred tax liability $ (218 ) $ (167 ) The net deferred tax liability is classified as other noncurrent liabilities in the accompanying Consolidated Balance Sheets. The Company has federal and state net operating loss carryforwards related to past acquisitions and current year losses. Internal Revenue Code Section 382 ("Section 382") places certain limitations on the annual amount of U.S. net operating loss carryforwards that can be utilized when a change of ownership occurs. The Company believes the past acquisitions were changes in ownership pursuant to Section 382, subjecting federal acquired net operating losses to limitations. According to French law the net operating loss carryforwards are not subject to ownership change limitations. The federal and foreign net operating loss and R&E tax credit carryforward amount available to be used in future periods, taking into account the 382 annual limitation and current year losses, is approximately $170.0 million and $9.4 million , respectively. The Company’s net operating losses will begin to expire in 2024, R&E credits will begin to expire in 2031, and foreign tax credits will begin to expire in 2022. Also included in net operating losses are $29.0 million of French carryforwards which have no expiration. The Company has elected the "with-and-without approach" regarding ordering of windfall tax benefits to determine whether the windfall tax benefit reduced taxes payable in the current year. Under this approach, the windfall tax benefits would be recognized in additional paid-in capital only if an incremental tax benefit is realized after considering all other tax benefits presently available to the Company. The Company’s $52.9 million deferred tax asset related to NOL carryforwards is net of $4.2 million of unrealized excess tax benefits related to stock based compensation. The impact of the excess tax benefit will be recognized in additional paid-in capital upon utilization of the Company’s NOL and tax credits carryforward. As of December 31, 2014, the Company determined it was more likely than not that it would be unable to fully utilize the majority of its U.S. and state deferred tax assets. As a result, the Company had recorded a valuation allowance against those assets to the extent that they cannot be realized through net operating loss carrybacks to prior years. This valuation allowance is evaluated periodically and will be reversed partially or in whole if business results and the economic environment have sufficiently improved to support realization of some or all of the Company's deferred tax assets. In performing the analysis throughout 2016, the Company determined that there was no sufficient positive evidence to outweigh the current and historic negative evidence to determine that it was more likely than not that the deferred assets would not be realized. Therefore, the Company continues to have a valuation allowance against net deferred tax assets as of December 31, 2016 and 2015 . Undistributed earnings of the Company’s foreign subsidiaries are considered permanently reinvested and, accordingly, no provision for U.S. federal or state income taxes has been provided thereon. The cumulative amount of undistributed earnings of the Company’s non-U.S. subsidiaries was immaterial for the years ended December 31, 2016 and 2015 . The determination of the related deferred tax liability, which requires complex analysis of international tax situations related to repatriation, is not practical at this time. The Company is presently investing in international operations located in Europe, North America, and Australia. The Company is funding the working capital needs of its foreign operations through its U.S. operations. In the future, the Company plans to utilize its foreign undistributed earnings, as well as continued funding from its U.S. operations, to support its continued foreign investment. For the years ended December 31, 2016 , 2015 and 2014 , the Company had $0.2 million , $0.2 million and $0.4 million , respectively, of net unrecognized tax benefits which, if recognized, would impact the Company's effective tax rate. The Company recorded immaterial amounts for interest and penalties as of December 31, 2016 , 2015 and 2014 , respectively. The Company believes that it is reasonably possible that there will be no change in the unrecognized tax benefits within the next twelve months. The Company is not aware of any significant income tax examinations in progress at this time. The Company files tax returns in the United States and various state and foreign jurisdictions. The Company is subject to U.S. federal income tax examination for the calendar tax years 2013, 2014 and 2015 and state and foreign income tax examination for various years depending on the statutes of limitation of those jurisdictions. The following table sets forth the changes to the Company's unrecognized tax benefit for the year ended December 31, 2016 , 2015 and 2014 (in thousands): Year Ended December 31, 2016 2015 2014 Beginning balance $ 192 $ 395 $ 349 Changes based on tax positions related to prior year — 21 46 Changes due to settlement — (224 ) — Ending balance $ 192 $ 192 $ 395 The table above has been updated to reflect gross tax liability, exclusive of interest and penalties and other offsetting amounts.

Convertible debt (Notes)

Convertible debt (Notes)	12 Months Ended
	Dec. 31, 2016
Debt Instrument [Line Items]
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 2.0% 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 December 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, 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 a nominal 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): December 31, 2016 December 31, 2015 Liability component: Principal $ 143,750 $ 143,750 Less: debt discount, net of amortization (21,451 ) (27,890 ) Net carrying amount $ 122,299 $ 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): Year Ended December 31, 2016 Year Ended December 31, 2015 2.0% coupon $ 2,880 $ 2,875 Amortization of debt issuance costs 831 795 Amortization of debt discount 5,608 5,244 Total $ 9,319 $ 8,914 As of December 31, 2016 and 2015 , the fair value of the Senior Notes was $120.0 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). 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.

Credit Facility

Credit Facility	12 Months Ended
	Dec. 31, 2016
Credit Facility Disclosure [Abstract]
Debt Disclosure [Text Block]	Credit Facility In July 2012, the Company, through its wholly owned subsidiary PROS, Inc., entered into a $50 million secured Credit Agreement (the "Revolver") with the lenders party thereto and Wells Fargo Bank, National Association as agent for the lenders party thereto. In connection with the issuance of the Senior Notes, PROS, Inc. amended the Revolver in December 2014 to, among other things, allow for the Company’s issuance of the Senior Notes, Note Hedge and Warrant. The Revolver is for a five year term expiring in July 2017 (see Note 21), with interest paid at the end of the applicable one month, three month or six month interest period at a rate per annum equal to LIBOR plus an applicable margin of 1.5% to 2.25% or the Federal Funds Rate plus an applicable margin of 1.5% to 2.25% . Borrowings under the Revolver are collateralized by a first priority interest in and lien on all of the Company's material assets . The Revolver contains affirmative and negative covenants, including covenants which restrict the ability of the Company to, among other things, create liens, incur additional indebtedness and engage in certain other transactions, in each case subject to certain exclusions. In addition, the Revolver contains certain financial covenants which become effective in the event the Company's availability under the revolver plus cash and cash equivalents falls below $20 million (see Note 21) or upon the occurrence of an event of default. As of December 31, 2016 , the Company was in compliance with all financial covenants in the Revolver. As of December 31, 2016 and 2015 , less than $0.1 million of unamortized debt issuance costs related to the Revolver is included in prepaid and other current assets and other long-term assets in the consolidated balance sheets, respectively. For the years ended December 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 Consolidated Statements of Comprehensive Income (Loss). As of December 31, 2016 , the Company had no outstanding borrowings under the Revolver.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and contingencies Litigation In the ordinary course of the Company’s 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. Indemnification The Company’s software agreements generally include certain provisions for indemnifying customers against liabilities if the Company’s software solutions infringe a third party’s intellectual property rights. To date, the Company has not incurred any losses as a result of such indemnifications and has not accrued any liabilities related to such obligations in the Company’s Consolidated Financial Statements. Lease commitments The Company leases office space and office equipment under non-cancellable operating leases that expire at various dates. The Company incurred approximately $4.1 million , $3.5 million and $3.3 million of total rent expense for the years ended December 31, 2016 , 2015 and 2014 , respectively. As of December 31, 2016 , the future minimum lease commitments related to lease agreements were as follows: Year Ending December 31, Amount 2017 $ 3,833 2018 2,688 2019 2,263 2020 783 2021 297 2022 and thereafter 74 Total minimum lease payments $ 9,938 The Company's headquarters are located in Houston, Texas, where it leases approximately 98,000 square feet of office space. In June 2016, the Company entered into a fifth amendment to this corporate office lease (the "Fifth Lease Amendment"). The Fifth Lease Amendment, among other things, provides for a three year extension, until October 31, 2019, unless earlier terminated or extended pursuant to the terms of the lease. The Company also has smaller regional offices in London, England; Dublin, Ireland; Paris, France; Toulouse, France; Munich, Germany; Frankfurt, Germany; Sydney, Australia; San Francisco, California; Skokie, Illinois; and Austin, Texas. In August 2012, the Company entered into a ten year lease for approximately 3,100 square feet of office space in London, United Kingdom. The lease provides an option to terminate the lease in August 2017. In June 2011, the Company entered into a five year lease for approximately 3,300 square feet of office space in Austin, Texas. In August 2016, the Company signed a second amendment to renew its Austin office lease through September 2018. As part of the SignalDemand, Inc. acquisition, the Company assumed a lease for approximately 6,600 square feet of office in San Francisco, California. This lease was renewed through December 2020. As part of the PROS France acquisition, the Company assumed a lease for approximately 14,380 square feet of office space in Toulouse, France, which expires February 24, 2018. As part of the PROS France acquisition, the Company also assumed a lease for approximately 9,666 square feet of office space in Skokie, Illinois, which expires February 28, 2018 with an option to extend the term of the lease for an additional 5 years. 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 Company believes its existing facilities are sufficient for its current needs. The Company may add new facilities and expand its existing facilities as it adds employees, and it believes that suitable additional or substitute space will be available as needed to accommodate any such expansion of its operations. The Company had no capital leases at December 31, 2016 and 2015 .

Segments

Segments	12 Months Ended
	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Segment Reporting Disclosure [Text Block]	Segment and geographic information Operating segments are the components of an enterprise about which separate financial information is available that is evaluated on a regular basis by the chief operating decision-maker ("CODM") in deciding how to allocate resources to an individual segment and in assessing performance of the segment. The Company’s CODM is its CEO, who reviews financial information presented on a consolidated basis for purposes of allocating resources and evaluating financial performance. The Company sells its pricing and revenue management software to customers in multiple industries and geographies, but has no segment managers who are held accountable for operations, operating results or components below the consolidated unit level. The company does not allocate costs at a level that would give segment managers the ability to meaningfully evaluate financial performance below the level presented to the CODM. Therefore, the Company believes that it operates in one segment and has a single reporting unit. Revenue by geography The Company presents financial information on a consolidated basis and does not assess the profitability of its geographic regions. Accordingly the Company does not attempt to comprehensively assign or allocate costs to these regions and does not produce reports for, or measure the performance of, its geographic regions based on any asset-based metrics. International revenue for the years ended December 31, 2016 , 2015 and 2014 , amounted to approximately $96.5 million , $104.5 million and $103.7 million , respectively, representing 63% , 62% and 56% , respectively, of annual revenue. The following geographic information is presented for the years ended December 31, 2016 , 2015 and 2014 . The Company categorizes geographic revenues based on the location of the customer’s headquarters. Year Ended December 31, 2016 2015 2014 Revenue Percent Revenue Percent Revenue Percent The Americas: United States of America $ 56,774 37 % $ 63,754 38 % $ 82,086 44 % Other 9,335 6 % 10,680 6 % 15,365 8 % Subtotal 66,109 43 % 74,434 44 % 97,451 52 % Europe 44,655 29 % 47,514 28 % 45,987 25 % Asia Pacific 30,457 20 % 30,110 18 % 34,170 18 % The Middle East 10,567 7 % 14,198 8 % 6,239 3 % Africa 1,488 1 % 1,990 1 % 1,982 1 % Total revenue $ 153,276 100 % $ 168,246 100 % $ 185,829 100 %

Concentrations of Risk

Concentrations of Risk	12 Months Ended
	Dec. 31, 2016
Risks and Uncertainties [Abstract]
Concentration Risk Disclosure [Text Block]	Concentrations of credit risk For the years ended December 31, 2016 , 2015 and 2014 , no customer accounted for 10% or more of revenue. For the year ended December 31, 2016 , no customer accounted for 10% or more of accounts receivables, net and unbilled. The Company’s cash and cash equivalents and short-term investments on deposit with any one party and at any point in time may exceed federally insured limits. To date, the Company has not incurred any losses in connection with short-term investments.

Related Party Transaction

Related Party Transaction	12 Months Ended
	Dec. 31, 2016
Related Party Transactions [Abstract]
Related Party Transactions Disclosure [Text Block]	Related-party transactions The Company currently has employment agreements with its executive officers. The employment agreements provide for twelve to eighteen months of salary upon termination without cause or, in some cases, for good reason and the vesting of certain stock options or other equity awards.

Employment Retirement Savings

Employment Retirement Savings	12 Months Ended
	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Defined Benefit Plan Disclosure [Line Items]	Employee retirement savings plan The Company sponsors a 401(k) savings plan ("401(k) Plan"). The 401(k) Plan is available to substantially all United States employees and is designed to provide eligible employees with an opportunity to make regular contributions to a long-term investment and savings program. Historically, the Company’s matching contribution is defined as 50% of the first 6% of employee contributions. The Company may also make discretionary contributions. Matching contributions by the Company in 2016 , 2015 and 2014 totaled approximately $1.9 million , $1.8 million and $1.4 million , respectively.

Quarterly Results

Quarterly Results	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information [Text Block]	Quarterly results (Unaudited) The following table presents certain unaudited quarterly financial data for the years ended December 31, 2016 and 2015 . This information has been prepared on the same basis as the accompanying Consolidated Financial Statements and all necessary adjustments have been included in the amounts below to state fairly the selected quarterly information when read in conjunction with the accompanying Consolidated Financial Statements and Notes thereto. Quarter Ended December 31, 2016 September 30, 2016 June 30, 2016 March 31, 2016 Total revenue $ 39,926 $ 38,384 $ 37,038 $ 37,928 Gross profit $ 23,974 $ 22,742 $ 20,990 $ 22,217 Loss from operations $ (16,258 ) $ (13,116 ) $ (18,050 ) $ (17,974 ) Net loss attributable to PROS Holdings, Inc. $ (18,513 ) $ (15,708 ) $ (20,527 ) $ (20,477 ) Net loss attributable to common stockholders per share: Basic $ (0.61 ) $ (0.52 ) $ (0.68 ) $ (0.68 ) Diluted $ (0.61 ) $ (0.52 ) $ (0.68 ) $ (0.68 ) Quarter Ended December 31, September 30, June 30, March 31, Total revenue $ 42,012 $ 40,866 $ 41,689 $ 43,679 Gross profit $ 26,599 $ 25,600 $ 25,959 $ 28,678 Loss from operations $ (15,040 ) $ (15,866 ) $ (12,868 ) $ (11,723 ) Net loss attributable to PROS Holdings, Inc. $ (17,731 ) $ (18,182 ) $ (15,668 ) $ (14,230 ) Net loss attributable to common stockholders per share: Basic $ (0.60 ) $ (0.61 ) $ (0.53 ) $ (0.48 ) Diluted $ (0.60 ) $ (0.61 ) $ (0.53 ) $ (0.48 )

Subsequent events (Notes)

Subsequent events (Notes)	12 Months Ended
	Dec. 31, 2016
Subsequent Event [Line Items]
Subsequent Events [Text Block]	21. Subsequent Events On January 27, 2017, the Company, through its wholly owned subsidiary PROS, Inc., entered into a Seventh Amendment (the "Seventh Amendment") to the Revolver (see Note 14). The Seventh Amendment provides for, among other things, an extension of the maturity date of the Revolver to July 2, 2022, and additional financial covenants with which the Company must comply if the Company's liquidity falls below an amended amount of $50 million or upon the occurrence of an event of default. The remaining material terms of the Revolver remain unchanged, and are summarized in Note 14.

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract]
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]	Schedule II Valuation and Qualifying Accounts Balance at beginning of period Additions charged to costs and expenses Deductions (1) Other (2) Balance at end of period Allowance for doubtful accounts 2016 $ 586 $ 887 $ (713 ) $ — $ 760 2015 $ 868 $ 319 $ (601 ) $ — $ 586 2014 $ 1,060 $ 8 $ (200 ) $ — $ 868 Valuation allowance 2016 $ 44,321 $ 26,634 $ — $ (1,906 ) $ 69,049 2015 $ 24,027 $ 20,890 $ — $ (596 ) $ 44,321 2014 $ 1,357 $ 19,506 $ — $ 3,164 $ 24,027 (1) Deductions column represents the reversal of additions previously charged to costs and expenses and uncollectible accounts written off, net of recoveries. (2) Other column represents valuation allowance adjustments recorded as part of the purchase accounting allocation related to the PROS France and SignalDemand, Inc. acquisitions as well as cumulative translation adjustment.

Summary of Significant Accoun29

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	Principles of consolidation and basis of presentation The Consolidated Financial Statements include the accounts of the Company, and its wholly-owned subsidiaries. All significant intercompany transactions and balances have been eliminated in consolidation. The Consolidated Financial Statements of the Company have been prepared in accordance with generally accepted accounting principles in the United States ("GAAP").
Dollar amounts
Use of estimates	Use of estimates The Company’s management makes estimates and assumptions in the preparation of its audited Consolidated Financial Statements in conformity with GAAP. These estimates and assumptions may affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the audited Consolidated Financial Statements and the reported amounts of revenue and expense during the reporting periods. Actual results could differ from those estimates. The complexity of the estimation process and issues related to the assumptions, risks and uncertainties inherent in the application of the percentage-of-completion method of revenue recognition affects the amount of revenue, expenses, unbilled receivables and deferred revenue. Numerous internal and external factors can affect estimates. Estimates are also used for, but not limited to, receivables, allowance for doubtful accounts, useful lives of assets, depreciation and amortization, the fair value of assets acquired and liabilities assumed for business combinations, income taxes and deferred tax asset valuation, valuation of stock options, other current liabilities and accrued liabilities.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and cash equivalents The Company considers all highly liquid investments with an original maturity of three months or less at the time of purchase, or the ability to be settled in cash within a period of three months, to be cash equivalents, except for commercial paper which is classified as short-term investments. The Company has a cash management program that provides for the investment of excess cash balances, primarily in short-term money market instruments.
Investment, Policy [Policy Text Block]	Short-term investments The Company's investments are available-for-sale commercial paper and certificates of deposit that are recorded at fair value in the Consolidated Balance Sheets. The Company classifies all commercial paper regardless of original maturity at purchase price as investments. 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. 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 December 31, 2016 .
Cost Method Investments, Policy [Policy Text Block]	Cost method investment Investments in equity securities of privately held companies without readily determinable fair value, where the Company does not exercise significant influence over the investee, are recorded using the cost method of accounting, carrying the investment at historical cost. If there are no identified events or changes in circumstances that might have an adverse effect on the cost method investments, the Company does not estimate the investments' fair value. For all investments, if a decline in the fair value of an investment below the carrying value is determined to be other-than-temporary, such investment is written down to its estimated fair value with a charge to current earnings.
Fair Value of Financial Instruments, Policy [Policy Text Block]	Financial instruments The carrying amount of the Company’s financial instruments, which include cash equivalents, short-term investments, receivables and accounts payable, and cost method investment approximates their fair values at December 31, 2016 and 2015 . For additional information on the Company’s fair value measurements, see Note 9 to the Consolidated Financial Statements.
Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block]	Allowance for doubtful accounts The Company maintains an allowance for doubtful accounts which reflects the Company's best estimate of potentially uncollectible receivables. The Company regularly reviews the receivables allowances by considering such factors as historical experience, credit-worthiness, the age of the receivable balances and current economic conditions that may affect a customer’s ability to pay and the Company specifically reserves for those deemed uncollectible.
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]	Prepaid expenses and other assets Prepaid expenses and other assets consist primarily of prepaid income taxes, deferred project costs and prepaid third-party license fees.
Property, Plant and Equipment, Policy [Policy Text Block]	Property and equipment, net Property and equipment are recorded at cost, less accumulated depreciation. Maintenance, repairs and minor replacements are charged to expense as incurred. Significant renewals and betterments are capitalized. Depreciation on property and equipment, with the exception of leasehold improvements, is recorded using the straight-line method over the estimated useful lives of the assets. Depreciation on leasehold improvements is recorded using the shorter of the lease term or useful life. When property is retired or disposed of, the cost and related accumulated depreciation are removed from the accounts and any resulting gains or losses are reflected in the Consolidated Statements of Comprehensive Income in the period of disposal.
Internal-use software	Internal-use software Costs incurred to develop internal-use software during the application development stage are capitalized, stated at cost, and depreciated using the straight-line method over the estimated useful lives of the assets. Application development stage costs generally include salaries and personnel costs and third-party contractor expenses associated with internal-use software development, configuration, coding and testing. Capitalization of such costs begins when the preliminary project stage is complete and ceases at the point in which the project is substantially complete and is ready for its intended purpose. Capitalized internal-use software is included in property and equipment, net in the Consolidated Balance Sheets.
Commissions Expense, Policy [Policy Text Block]	Deferred commissions Sales commissions earned by the Company's sales force are considered to be direct sales commissions when they are associated specifically with a non-cancellable subscription contract. Direct sales commissions are deferred when earned and amortized over the same period that revenues are recognized for the related non-cancellable subscription contract.
Impairment or Disposal of Long-Lived 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 in the year ended December 31, 2016 . During the years ended December 31, 2015 and 2014 , the Company recorded a full impairment of $2.9 million and $4.0 million , respectively, related to capitalized internal-use software associated with the expected future cash flows.
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Intangible assets and goodwill Intangible assets that have finite lives are amortized over their useful lives and are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. During this review, the Company reevaluates the significant assumptions used in determining the original cost and estimated lives of long-lived assets. Although the assumptions may vary from asset to asset, they generally include operating results, changes in the use of the asset, cash flows and other indicators of value. Management then determines whether the remaining useful life continues to be appropriate or whether there has been an impairment of long-lived assets based primarily upon whether expected future undiscounted cash flows are sufficient to support the assets’ recovery. If impairment exists, the Company would adjust the carrying value of the asset to fair value, generally determined by a discounted cash flow analysis. Goodwill represents the excess of the purchase consideration over the net of the acquisition-date fair value of identifiable assets acquired, including identifiable intangible assets, and liabilities assumed in connection with business combinations. Goodwill is not amortized, but is assessed for impairment as of November 30 of each fiscal year, or more frequently if events or changes in circumstances indicate that the fair value of the Company’s reporting unit has been reduced below its carrying value. When conducting the annual goodwill impairment assessment, a three step process is used. The first step is to perform an optional qualitative evaluation as to whether it is more likely than not that the fair value of the Company’s reporting unit is less than its carrying value, using an assessment of relevant events and circumstances. In performing this assessment, the Company is required to make assumptions and judgments including but not limited to an evaluation of macroeconomic conditions as they relate to the business, industry and market trends, as well as the overall future financial performance of the reporting unit and future opportunities in the markets in which it operates. If it is determined that it is not more likely than not that the fair value of the reporting unit is less than its carrying value, no additional tests are required to be performed in assessing goodwill for impairment. However, if the Company concludes otherwise or elects not to perform the qualitative assessment, the Company performs a second step, consisting of a quantitative assessment of goodwill impairment. This quantitative assessment requires us to estimate the fair value of the reporting unit and compare the estimated fair value to its respective carrying value (including goodwill) as of the date of the impairment test. The third step, employed for the reporting unit failing the second step, is used to measure the amount of any potential impairment and compares the implied fair value of the reporting unit with the carrying amount of goodwill. Based on the results of the qualitative review of goodwill performed as of November 30, 2016, the Company did not identify any indicators of impairment. As such, the second and third steps described above were not necessary.
Research, Development, and Computer Software, Policy [Policy Text Block]	Research and development Research and development costs for software sold to customers are expensed as incurred. These costs include salaries and personnel costs, including employee benefits, third-party contractor expenses, software development tools, an allocation of facilities and depreciation expenses and other expenses in developing new solutions and upgrading and enhancing existing solutions. Software development costs Capitalization of software development costs for software to be sold, leased, or otherwise marketed begins upon the establishment of technological feasibility, which is generally the completion of a working prototype that has been certified as having no critical bugs and is a release candidate. Amortization begins once the software is ready for its intended use, generally based on the pattern in which the economic benefits will be consumed. To date, software development costs incurred between completion of a working prototype and general availability of the related product have not been material.
Treasury Stock [Text Block]	Treasury stock The Company is authorized to make treasury stock purchases in the open market pursuant to the share repurchase program, which was approved by its Board of Directors on August 28, 2008. The Company accounts for the purchase of treasury stock under the cost method. For additional information on the Company’s stock repurchase program, see Note 10 to the Consolidated Financial Statements. There were no treasury stock repurchases for the years ended December 31, 2016 , 2015 and 2014 .
Revenue recognition	Revenue recognition The Company derives its revenues primarily from subscription services fees, professional services, the perpetual licensing of its software products and the associated software maintenance and support services. The Company has historically derived the majority of its revenue from the licensing of its software products, the related implementation and associated software maintenance and support. More recently, it has emphasized its offers of subscription services that do not require customers to host its solutions in their data centers. The Company commences revenue recognition when all of the following criteria are met: • there is persuasive evidence of an arrangement; • the service has been or is being provided to the customer; • collection of the fee is reasonably assured; and • the amount of fees to be paid by the customer is fixed and determinable. Subscription services revenue Subscription services revenue is generally recognized ratably over the contractual term of the arrangement beginning on the date that the Company's service is made available to the customer, assuming all other revenue recognition criteria have been met. The Company's subscription contracts do not provide customers with the right to take possession of the software supporting the applications and, as a result, are accounted for as service contracts. 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. For the Company's subscription services that include professional services, the Company determines whether the professional services have standalone value. Professional services deemed to have standalone value are accounted for separately from subscription services and the subscription services revenue recognition commences on the date that the Company's service is made available to the customer. If determined that the professional services do not have standalone value, the transaction is treated as a single element and the subscription services and professional services revenue is deferred until the customer commences use of the subscription services, and the subscription services revenue is recognized over the remaining term of the arrangement. Maintenance and support revenue 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. License revenue 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 upon software delivery, assuming all other revenue recognition criteria have been 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 revenue Professional services revenues are generally recognized as the services are rendered for time and material contracts, or on a proportional performance basis for fixed price contracts. The majority of the Company's professional services contracts are on a time and materials basis. Training revenues are recognized as the services are rendered. For the Company's subscription services that include professional services, the Company determines whether the professional services have standalone value. Professional services deemed to have standalone value are accounted for separately from subscription services and typically recognized as the services are performed. If determined that the professional services do not have standalone value, the transaction is treated as a single element, the professional services revenue is deferred until the customer commences use of the subscription services, and the professional services revenue is recognized over the remaining term of the arrangement. For software license arrangements that include professional services, the Company determines 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. For professional services considered essential to the functionality of the software, 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. Multiple element arrangements For arrangements with multiple deliverables, the Company evaluates whether the individual deliverables qualify as separate units of accounting. In order to treat deliverables in a multiple deliverable arrangement as separate units of accounting, the deliverables must have standalone value upon delivery. If the deliverables have standalone value upon delivery, the Company accounts for each deliverable separately and revenue is recognized for the respective deliverables as they are delivered. When multiple deliverables included in an arrangement are separable into different units of accounting, the arrangement consideration is allocated to the identified separate units of accounting based on their relative selling price. Multiple deliverable arrangement accounting guidance provides a hierarchy when determining the relative selling price for each unit of accounting. VSOE of selling price, based on the price at which the item is regularly sold by the vendor on a standalone basis, should be used if it exists. If VSOE of selling price is not available, third-party evidence ("TPE") of selling price is used to establish the selling price if it exists. If neither VSOE nor TPE exist for a deliverable, arrangements with multiple deliverables can be separated into discrete units of accounting based on the Company's best estimate of selling price ("BESP"). The amount of arrangement fee allocated is limited by contingent revenues, if any. 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, the Company 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 standalone 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. For multiple-element arrangements that contain software and nonsoftware elements such as its subscription services, 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 utilize VSOE of fair value if it exists. The Company applies the residual method to recognize revenue for the delivered elements in standalone 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. 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.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign currency The Company has contracts denominated in foreign currencies and therefore a portion of the Company’s revenue is subject to foreign currency risks. Gains and losses from foreign currency transactions, such as those resulting from the settlement of receivables, are classified in other expense, net included in the accompanying Consolidated Statements of Comprehensive Income (Loss). The functional currency of PROS France SAS ("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 income (loss) as a component of stockholders’ equity.
Noncash share-based compensation	Noncash share-based compensation The Company has two noncash share-based compensation plans, the 1999 Equity Incentive Plan ("1999 Stock Plan") and the 2007 Equity Incentive Plan ("2007 Stock Plan"), which authorize the discretionary granting of various types of stock awards to key employees, officers, directors and consultants. The 1999 Stock Plan was terminated in March 2007 for purposes of granting any future equity awards. The 2007 Stock Plan was adopted in March 2007. The Company may provide noncash share-based compensation through the grant of: (i) restricted stock awards; (ii) restricted stock unit awards - time, performance and market-based ("RSUs"); (iii) stock options; (iv) stock appreciation rights ("SARs"); (v) phantom stock; and (vi) performance awards. Also in February 2014, the Company granted inducement awards in an aggregate amount of up to 308,250 shares in accordance with NYSE Rule 303A.08. These inducement awards were in the form of RSUs and market stock units ("MSUs") granted to the Company's former Chief Operating Officer and RSUs granted to certain new employees in connection with the acquisitions of PROS France and SignalDemand Inc. To date, the Company has granted stock options, stock appreciation rights, restricted stock units, time-based, performance-based and market-based, and market stock units. The Company issues common stock from its pool of authorized stock upon exercise of stock options, settlement of stock appreciation rights and market stock units or upon vesting of restricted stock units. The following table presents the number of awards outstanding for each award type as of December 31, 2016 and 2015 (in thousands): Year Ended December 31, Award type 2016 2015 Stock options 734 829 Restricted stock units (time-based) 2,237 1,915 Restricted stock units (performance-based) — 24 Restricted stock units (market-based) 460 — Stock appreciation rights 515 522 Market stock units 342 563 Stock options. The Company did not grant stock options during 2016 and 2015 . The fair value of each stock option was estimated on the date of grant using the Black-Scholes option pricing model. Restricted stock units. The fair value of the RSUs (time-based and performance-based) is based on the closing price of the Company’s stock on the date of grant and is amortized over the vesting period. RSUs include (i) time-based awards, (ii) performance-based awards in which the number of shares that vest are based upon satisfying certain conditions from binding customer agreements for the provision of configure, price, and quote ("CPQ") solutions, and (iii) market-based awards in which the number of shares that vest are based upon attainment of target average per share closing price over a requisite trading period. Market-based RSUs vest if the average trailing closing price of the Company's Common Stock meets certain minimum performance hurdles for at least 105 calendar days prior to September 9, 2020, with 25% vesting at $27 , an additional 25% vesting at $33 , and the remaining 50% vesting at $41 . The Company estimates the fair value and the derived service period of the market-based RSUs on the date of grant using a Monte Carlo simulation model. The model requires the use of a number of assumptions including the expected volatility of the Company's stock, its risk-free interest rate and expected dividends. The Company's expected volatility at the date of grant is based on the historical volatility of the Company over the performance period. Stock appreciation rights. SARs will be settled in stock at the time of exercise and vest over four years from the date of grant. The Company used the Black-Scholes option pricing model to estimate the fair value of its SARs. The determination of the fair value of SARs utilizing the Black-Scholes model is affected by the Company’s stock price and a number of assumptions, including expected volatility, expected life, deliver risk-free interest rate and expected dividends. The Company estimates the expected volatility of common stock at the date of grant based on a combination of its historical volatility and the average volatility of comparable companies. The expected life of the SARs noncash share-based payment awards is a historical weighted average of the expected lives of similar securities of comparable public companies. The risk-free interest rate assumption is based on observed interest rates appropriate for the terms of the Company’s awards. The dividend yield assumption is based on the Company's expectation of paying no dividends. Market stock units. MSUs are performance-based awards that vest based upon the Company’s relative shareholder return. The actual number of MSUs that will be eligible to vest is based on the total shareholder return of the Company relative to the total shareholder return of the Russell 2000 Index ("Index") over a three year period ending December 31, 2015, December 31, 2016, December 31, 2017, March 2, 2018 and February 28, 2019 ("Performance Period"), respectively. The MSUs vest on January 1, 2016, January 1, 2017, January 1, 2018, March 3, 2018 and March 1, 2019, respectively. The maximum number of shares issuable upon vesting is 200% of the MSUs initially granted based on the average price of the Company's common stock relative to the Index during the Performance Period. 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 volatility 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. As the Company issues stock options and SARs, it evaluates the assumptions used to value its stock option awards and SARs. If factors change and the Company employs different assumptions, noncash share-based compensation expense may differ significantly from what has been recorded in the past. If there are any modifications or cancellations of the underlying unvested securities, the Company may be required to accelerate, increase or cancel any remaining unearned noncash share-based compensation expense. Future noncash share-based compensation expense and unearned noncash share-based compensation will increase to the extent that the Company grants additional equity awards to employees. At December 31, 2016 , there were an estimated $33.8 million of total unrecognized compensation costs related to noncash share-based compensation arrangements. These costs will be recognized over a weighted average period of 2.2 years. For further discussion of the Company’s noncash share-based compensation plans, see Note 11 to the Consolidated Financial Statements.
Standard Product Warranty, Policy [Policy Text Block]	Product warranties For software-as-a-service application subscriptions, the Company generally issues a product warranty for the subscription term, depending on the contract. For on-premise software licenses, the Company generally issues a product warranty for 90 days following the first use of the software in a production environment, depending on the contract. In the Company’s experience, warranty costs have been insignificant.
Income taxes	Income taxes The Company uses the asset and liability method to account for income taxes, including recognition of deferred tax assets and liabilities for the anticipated future tax consequences attributable to differences between financial statement amounts and their respective tax basis. The Company reviews its deferred tax assets for recovery. A valuation allowance is established when the Company believes that it is more-likely than not that some portion of its deferred tax assets will not be realized. Changes in the valuation allowance from period to period are included in the Company’s tax provision in the period of change. The Company accounts for uncertain income tax positions recognized in an enterprise’s financial statements in accordance with the income tax topic of the ASC issued by the FASB. This interpretation requires companies to use a prescribed model for assessing the financial recognition and measurement of all tax positions taken or expected to be taken in its tax returns. This guidance provides clarification on recognition, classification, interest and penalties, accounting in interim periods, disclosures and transition. The Company recognized accrued interest and penalties related to income taxes as a component of income tax expense. For additional information regarding the Company’s income taxes, see Note 12 to the Consolidated Financial Statements.
Segment Reporting, Policy [Policy Text Block]	Segment reporting The Company reports as one operating segment with the Chief Executive Officer ("CEO") acting as the Company’s chief operating decision maker. The Company’s CEO reviews financial information presented on a consolidated basis for purposes of allocating resources and evaluating financial performance. The Company has a single reporting unit, and there are no segment managers who are held accountable for operations, operating results or components below the consolidated unit level.
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, restricted stock units and market 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.
Recent accounting pronouncements	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 beginning 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. In August 2014, the FASB issued ASU 2014-15, “Presentation of Financial Statements - Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern”, which provides guidance about management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and sets rules for how this information should be disclosed in the financial statements. The new standard is effective for annual periods ending after December 15, 2016 and interim periods thereafter. Early adoption is permitted. The Company adopted this standard for the annual period ended December 31, 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. In May 2016, the FASB issued ASU 2016-12, "Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients", which clarifies the disclosure requirements for an entity that retrospectively applies the guidance in Topic 606. 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 standard will have on its consolidated financial statements and related disclosures. The Company continues to assess all potential impacts of the new standard, and currently believe the most significant impact relates to its accounting for arrangements that include term-based software licenses bundled with maintenance and support and additional disclosures. Under current GAAP, the revenue attributable to these term-based software licenses is recognized ratably over the term of the arrangement because VSOE does not exist for the undelivered maintenance and support element as it is not sold separately. The requirement to have VSOE for undelivered elements to enable the separation of revenue for the delivered software licenses is eliminated under the new standard. Accordingly, under the new standard, the Company will be required to recognize as revenue a portion of the arrangement fee upon delivery of the software license. While the Company currently expects revenue related to professional services and subscription services to remain substantially unchanged, it is still in the process of evaluating the impact of the new standard on these types of customer arrangements. 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. The amendments require entities to record all tax effects related to share-based payments at settlement or expiration through the income statement and the windfall tax benefit to be recorded when it arises, subject to normal valuation allowance considerations. 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. In August 2016, the FASB issued ASU 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments" which is intended to reduce the diversity in practice on classification of certain transactions in the statement of cash flows. This standard is effective for interim and annual reporting periods beginning after December 15, 2017; early adoption is permitted. The Company is currently assessing the impact of ASU 2016-15 on its condensed consolidated financial statements. In November 2016, the FASB issued ASU 2016-18, "Statement of Cash Flow (Topic 230): Restricted Cash" which requires amounts generally described as restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the total beginning and ending amounts for the periods shown on the statement of cash flows. The standard is effective for interim and annual reporting periods beginning after December 15, 2018 using a retrospective transition method to each period presented. The Company is currently assessing the impact of ASU 2016-18 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 year ended December 31, 2016 , that are of significance or potential significance to the Company.

Summary of Significant Accoun30

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]	The following table presents the number of awards outstanding for each award type as of December 31, 2016 and 2015 (in thousands): Year Ended December 31, Award type 2016 2015 Stock options 734 829 Restricted stock units (time-based) 2,237 1,915 Restricted stock units (performance-based) — 24 Restricted stock units (market-based) 460 — Stock appreciation rights 515 522 Market stock units 342 563

Business Combination (Tables)

Business Combination (Tables)	12 Months Ended
	Dec. 31, 2016
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Information [Table Text Block]	The unaudited financial information in the table below summarizes the combined results of operations of the Company and Cameleon, on a pro forma basis, as though the Company had acquired Cameleon on January 1, 2013. The pro forma information for all periods presented also includes the effect of business combination accounting resulting from the acquisition, including amortization charges from acquired intangible assets. Year Ended December 31, (in thousands) 2014 Total revenue $ 186,081 Net loss attributable to PROS Holdings, Inc. (36,776 ) Earnings per share - basic and diluted $ (1.27 )
Cameleon Acquistion [Member]
Business Acquisition [Line Items]
Schedule of Purchase Price Allocation [Table Text Block]	The allocation of the purchase price for Cameleon is updated as follows (in thousands): Cash and cash equivalents $ 7,086 Accounts receivable 10,395 Prepaid and other assets 1,418 Intangible assets 18,653 Goodwill 15,717 Accounts payable and accrued liabilities (12,539 ) Deferred revenue (5,392 ) Non-controlling interest (6,204 ) Net assets acquired $ 29,134
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]	The following are the identifiable intangible assets acquired and their respective useful lives (in thousands): Useful Life Amount (years) Trade Name $ 1,020 8 Customer Relationships 1,455 2-5 Maintenance Relationships 3,808 8 Developed Technology 11,147 7 Other 1,223 2 Total $ 18,653

Noncontrolling interest (Tables

Noncontrolling interest (Tables)	12 Months Ended
	Dec. 31, 2016
Noncontrolling Interest [Abstract]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Table Text Block]	The following table presents a rollforward of the non-controlling interest from the date of acquisition of PROS France on January 8, 2014 through December 31, 2014 (in thousands): Beginning balance as of January 8, 2014 $ 6,204 Change in Parent's ownership in the subsidiary, net of cumulative earnings previously allocated to NCI and re-allocated to Parent's equity (5,282 ) Net loss allocated to non-controlling interest (907 ) Foreign currency translation adjustment (15 ) Ending balance as of December 31, 2014 $ — The Company controlled 100% of PROS France as of December 31, 2014 and there were no activities or outstanding balance related to non-controlling interest for the years ended December 31, 2015 and 2016 .

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2016
Goodwill [Line Items]
Schedule of Goodwill [Table Text Block]	The change in the carrying amount of goodwill for the years ended December 31, 2016 and 2015 , was as follows (in thousands): Balance as of December 31, 2014 $ 21,563 Foreign currency translation adjustments (1,118 ) Balance as of December 31, 2015 20,445 Foreign currency translation adjustments (349 ) Balance as of December 31, 2016 $ 20,096
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Intangible assets consisted of the following as of December 31, (in thousands): December 31, 2016 Weighted average useful life (years) Gross Carrying Amount Accumulated Amortization* Net Carrying Amount Developed technology 7 $ 13,223 $ 5,671 $ 7,552 Internally developed technology and other 2 1,106 1,106 — Maintenance Relationship 8 3,346 1,755 1,591 Customer relationships 7 4,736 2,854 1,882 Trade name 2 829 829 — Acquired technology 4 1,625 — 1,625 Total $ 24,865 $ 12,215 $ 12,650 *Cumulative foreign currency translation adjustments, reflecting movement in the currencies of the underlying entities, decreased total intangible assets by approximately $0.2 million as of December 31, 2016 . December 31, 2015 Weighted average useful life (years) Gross Carrying Amount Accumulated Amortization* Net Carrying Amount Developed technology 7 $ 14,567 $ 4,897 $ 9,670 Internally developed technology and other 2 1,254 1,245 9 Maintenance Relationship 8 3,591 1,527 2,064 Customer relationships 7 4,853 2,405 2,448 Trade name 2 952 952 — Total $ 25,217 $ 11,026 $ 14,191 *Cumulative foreign currency translation adjustments, reflecting movement in the currencies of the underlying entities, decreased total intangible assets by approximately $1.2 million as of December 31, 2015 . Customer relationships are amortized over a period ranging from two to eight years.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	As of December 31, 2016 , the expected future amortization expense for the acquired intangible assets for each of the five succeeding years and thereafter was as follows (in thousands): Year Ending December 31, Amount 2017 $ 2,780 2018 3,155 2019 3,045 2020 3,015 2021 648 2022 and thereafter 7 Total amortization expense $ 12,650

Accounts Receivable and Contr34

Accounts Receivable and Contracts in Progress (Tables)	12 Months Ended
	Dec. 31, 2016
Accounts Receivable [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	Accounts receivable at December 31, 2016 and 2015 , consists of the following (in thousands): December 31, 2016 2015 Accounts receivable $ 31,722 $ 36,539 Unbilled receivables 2,323 3,162 Total receivables 34,045 39,701 Less: Allowance for doubtful accounts (760 ) (586 ) Accounts receivable, net $ 33,285 $ 39,115
Schedule Of Contracts In Progress [Table Text Block]	Activity related to contracts in progress at December 31, 2016 and 2015 , is summarized as follows (in thousands): December 31, 2016 2015 Costs and estimated earnings recognized to date $ 470,239 $ 415,172 Progress billings to date (547,654 ) (477,339 ) Total $ (77,415 ) $ (62,167 )
Schedule Of Unbilled Receivables And Deferred Revenue [Table Text Block]	These amounts are included in the accompanying Consolidated Balance Sheets at December 31, 2016 and 2015 , as follows (in thousands): December 31, 2016 2015 Unbilled receivables $ 2,323 $ 3,162 Deferred revenue (79,738 ) (65,329 ) Total $ (77,415 ) $ (62,167 )

Earnings per Share (Table)

Earnings per Share (Table)	12 Months Ended
	Dec. 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 Year Ended December 31, 2016 2015 2014 Numerator: Net loss attributable to PROS Holdings, Inc. $ (75,225 ) $ (65,811 ) $ (36,644 ) Denominator: Weighted average shares (basic) 30,395 29,578 28,915 Dilutive effect of stock options, restricted stock units and stock appreciation rights — — — Weighted average shares (diluted) 30,395 29,578 28,915 Basic earnings per share $ (2.47 ) $ (2.23 ) $ (1.27 ) Diluted earnings per share $ (2.47 ) $ (2.23 ) $ (1.27 )

Property and Equipment, net (Ta

Property and Equipment, net (Tables)	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment [Table Text Block]	Property and equipment, net as of December 31, 2016 and 2015 consists of the following: December 31, Estimated useful life 2016 2015 Furniture and fixtures 5-10 years $ 2,934 $ 2,869 Computers and equipment 3-5 years 20,321 19,069 Software 3-6 years 5,907 5,238 Capitalized internal-use software development costs 3 years 1,078 — Leasehold improvements Shorter of lease term or useful life 5,601 5,613 Construction in progress 98 55 Property and equipment, gross 35,939 32,844 Less: Accumulated depreciation and amortization (20,701 ) (17,067 ) Property and equipment, net $ 15,238 $ 15,777

Noncash Share-based Compensat37

Noncash Share-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Share-based Compensation Expense	Noncash share-based compensation expense is allocated to expense categories on the Consolidated Statements of Comprehensive Income. The following table summarizes noncash share-based compensation expense, net of amounts capitalized, for the years ended December 31, 2016 , 2015 and 2014 (in thousands). For the Year Ended December 31, 2016 2015 2014 Share-based compensation: Cost of revenue $ 2,267 $ 3,719 $ 3,469 Operating expenses: Selling and marketing 3,824 8,536 6,514 General and administrative 9,040 10,293 8,003 Research and development 5,335 5,316 4,679 Total included in operating expenses 18,199 24,145 19,196 Total share-based compensation expense $ 20,466 $ 27,864 $ 22,665
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	Stock options The following table summarizes the Company’s stock option activity for the year ended December 31, 2016 (number of shares and intrinsic value in thousands): Number of shares under option Weighted average exercise price Weighted average remaining contractual term (year) Aggregate intrinsic value (1) Outstanding, December 31, 2015 829 $ 12.06 Granted — — Exercised (95) 9.55 Forfeited — — Expired — — Outstanding, December 31, 2016 734 $ 12.38 0.86 $ 6,712 Vested and exercisable at December 31, 2016 734 $ 12.38 0.86 $ 6,712 (1) The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on December 31, 2016 of $21.52 and the grant date fair value.
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]	The following table summarizes the Company's SARs activity for the year ended December 31, 2016 (number of shares and intrinsic value in thousands): Stock appreciation rights Weighted average exercise price Weighted average remaining contractual term (year) Aggregate intrinsic value (1) Outstanding, December 31, 2015 522 $ 10.87 Granted — — Exercised (7 ) 11.42 Forfeited — — Expired — — Outstanding, December 31, 2016 515 $ 10.86 3.85 $ 5,487 Exercisable at December 31, 2016 515 $ 10.86 3.85 $ 5,487 Vested and expected to vest at December 31, 2016 515 $ 10.86 3.85 $ 5,487 (1) The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on December 31, 2016 of $21.52 and the exercise price of the underlying SARs.
Schedule of Nonvested Performance-based Units Activity [Table Text Block]	Number of unvested awards Weighted average grant date fair value Weighted average remaining contractual term (year) Aggregate intrinsic value (1) Unvested at December 31, 2015 563 $ 41.55 Granted 153 14.29 Exercised (252 ) 40.58 Forfeited (122 ) 44.47 Expired — — Unvested at December 31, 2016 342 $ 29.06 1.23 $ 7,362 (1) The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on December 31, 2016 of $21.52 and the grant date fair value of the underlying MSUs.
Fair value assumptions - market-based RSUs [Table Text Block]	The assumptions used to value the market-based RSUs granted during the year ended December 31, 2016 were as follows: December 31, 2016 Volatility 44.98% Risk-free interest rate 1.08% Dividend yield — The fair value of the market-based RSUs is expensed over the derived service period for each separate vesting tranche. The derived service period for the vesting tranches of the market-based RSUs ranges between 1.01 and 1.98 years.
Market Stock Units Valuation Assumptions [Table Text Block]	Significant assumptions used in the Monte Carlo simulation model for MSUs granted during the years ended December 31, 2016 , 2015 and 2014 are as follows: For the Year Ended December 31, 2016 2015 2014 Volatility 44.06% 42.06% 50.86% Risk-free interest rate 1.04% 0.89% 0.68% Expected option life in years 2.93 2.95 2.88 Dividend yield — — — The assumptions related to fiscal years 2015 and 2014 are presented on weighted average basis for the various awards granted throughout the period.
RSU - time-based and performance-based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]	The following table summarizes the Company's unvested time and performance-based RSUs as of December 31, 2016 , and changes during the year then ended (number of shares and intrinsic value in thousands): Number of shares Weighted average grant date fair value Weighted average remaining contractual term (year) Aggregate intrinsic value (1) Unvested at December 31, 2015 1,939 $ 26.75 Granted 1,353 11.69 Vested (884 ) 26.62 Forfeited (171 ) 20.21 Unvested at December 31, 2016 2,237 $ 18.05 2.41 $ 48,148 Expected to vest at December 31, 2016 2,162 $ 18.18 2.39 $ 46,516 (1) The aggregate intrinsic value was calculated based on the fair value of the Company’s common stock on December 31, 2016 of $21.52 .
Restricted stock unit - market-based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]	The following table summarizes the Company's unvested market-based RSUs as of December 31, 2016 , and changes during the year then ended (number of shares and intrinsic value in thousands): Number of Weighted Weighted Aggregate Unvested at December 31, 2015 — $ — Granted 460 11.92 Vested — — Forfeited — — Unvested at December 31, 2016 460 $ 11.92 3.69 $ 9,899 Expected to vest at December 31, 2016 430 $ 11.92 3.69 $ 9,245 (1) The aggregate intrinsic value was calculated based on the fair value of the Company’s common stock on December 31, 2016 of $21.52 .

Income Tax Disclosure (Tables)

Income Tax Disclosure (Tables)	12 Months Ended
	Dec. 31, 2016
Schedule of income tax components [Abstract]
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	The income tax provision (benefit) consisted of the following for the years ended December 31, 2016 , 2015 and 2014 (in thousands): Year Ended December 31, 2016 2015 2014 Current: Federal $ 19 $ (51 ) $ (935 ) State and Foreign 402 621 790 421 570 (145 ) Deferred: Federal 51 159 12,334 State (2 ) 10 304 Income tax provision $ 470 $ 739 $ 12,493
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	The differences between the effective tax rates reflected in the total provision for income taxes and the U.S. federal statutory rate of 34% for the years ended December 31, 2016 , 2015 and 2014 , respectively, were as follows (in thousands): Year Ended December 31, 2016 2015 2014 Provision at the U.S. federal statutory rate $ (25,338 ) $ (22,124 ) $ (8,520 ) Increase (decrease) resulting from: State income taxes, net of federal taxes 3 74 49 Nondeductible expenses 457 1,195 653 Acquisition-related expense (4 ) (4 ) 434 Statutory to GAAP income adjustment (274 ) 119 990 Foreign Tax Expense 2 350 837 Nondeductible noncash share based compensation 604 2,201 1,784 Incremental benefits for tax credits (1,663 ) (1,947 ) (3,259 ) Change in tax rate/income subject to lower tax rates and other 49 (15 ) 19 Change in valuation allowance 26,634 20,890 19,506 Income tax provision $ 470 $ 739 $ 12,493
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and liabilities as of December 31, 2016 and 2015 are as follows (in thousands): Year Ended December 31, 2016 2015 Noncurrent deferred tax liability: Property and equipment $ (2,114 ) $ (2,417 ) Noncash share based compensation 8,053 10,378 State deferred 242 249 Capitalized software (1,591 ) (1,538 ) Amortization (2,187 ) (2,289 ) R&E tax credit carryforwards 6,852 5,696 Deferred revenue 2,265 923 Federal Net Operating Losses ("NOLs") 40,671 20,889 State NOLs 1,517 714 State Credits 1,348 1,348 Foreign NOLs 10,663 8,457 Foreign tax credit carryforward 1,795 1,257 Other 1,317 487 Total noncurrent deferred tax assets 68,831 44,154 Less: valuation allowance (69,049 ) (44,321 ) Total noncurrent deferred tax liability (218 ) (167 ) Total net deferred tax liability $ (218 ) $ (167 )
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	The following table sets forth the changes to the Company's unrecognized tax benefit for the year ended December 31, 2016 , 2015 and 2014 (in thousands): Year Ended December 31, 2016 2015 2014 Beginning balance $ 192 $ 395 $ 349 Changes based on tax positions related to prior year — 21 46 Changes due to settlement — (224 ) — Ending balance $ 192 $ 192 $ 395 The table above has been updated to reflect gross tax liability, exclusive of interest and penalties and other offsetting amounts.

Convertible debt (Tables)

Convertible debt (Tables)	12 Months Ended
	Dec. 31, 2016
Debt Instrument [Line Items]
Convertible Debt [Table Text Block]	The Senior Notes consist of the following (in thousands): December 31, 2016 December 31, 2015 Liability component: Principal $ 143,750 $ 143,750 Less: debt discount, net of amortization (21,451 ) (27,890 ) Net carrying amount $ 122,299 $ 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): Year Ended December 31, 2016 Year Ended December 31, 2015 2.0% coupon $ 2,880 $ 2,875 Amortization of debt issuance costs 831 795 Amortization of debt discount 5,608 5,244 Total $ 9,319 $ 8,914

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]	As of December 31, 2016 , the future minimum lease commitments related to lease agreements were as follows: Year Ending December 31, Amount 2017 $ 3,833 2018 2,688 2019 2,263 2020 783 2021 297 2022 and thereafter 74 Total minimum lease payments $ 9,938

Segments (Tables)

Segments (Tables)	12 Months Ended
	Dec. 31, 2016
Schedule of Geographic Revenue [Abstract]
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]	The following geographic information is presented for the years ended December 31, 2016 , 2015 and 2014 . The Company categorizes geographic revenues based on the location of the customer’s headquarters. Year Ended December 31, 2016 2015 2014 Revenue Percent Revenue Percent Revenue Percent The Americas: United States of America $ 56,774 37 % $ 63,754 38 % $ 82,086 44 % Other 9,335 6 % 10,680 6 % 15,365 8 % Subtotal 66,109 43 % 74,434 44 % 97,451 52 % Europe 44,655 29 % 47,514 28 % 45,987 25 % Asia Pacific 30,457 20 % 30,110 18 % 34,170 18 % The Middle East 10,567 7 % 14,198 8 % 6,239 3 % Africa 1,488 1 % 1,990 1 % 1,982 1 % Total revenue $ 153,276 100 % $ 168,246 100 % $ 185,829 100 %

Quarterly Results Quarterly Fin

Quarterly Results Quarterly Financial Information Disclosures (Tables)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information [Table Text Block]	The following table presents certain unaudited quarterly financial data for the years ended December 31, 2016 and 2015 . This information has been prepared on the same basis as the accompanying Consolidated Financial Statements and all necessary adjustments have been included in the amounts below to state fairly the selected quarterly information when read in conjunction with the accompanying Consolidated Financial Statements and Notes thereto. Quarter Ended December 31, 2016 September 30, 2016 June 30, 2016 March 31, 2016 Total revenue $ 39,926 $ 38,384 $ 37,038 $ 37,928 Gross profit $ 23,974 $ 22,742 $ 20,990 $ 22,217 Loss from operations $ (16,258 ) $ (13,116 ) $ (18,050 ) $ (17,974 ) Net loss attributable to PROS Holdings, Inc. $ (18,513 ) $ (15,708 ) $ (20,527 ) $ (20,477 ) Net loss attributable to common stockholders per share: Basic $ (0.61 ) $ (0.52 ) $ (0.68 ) $ (0.68 ) Diluted $ (0.61 ) $ (0.52 ) $ (0.68 ) $ (0.68 ) Quarter Ended December 31, September 30, June 30, March 31, Total revenue $ 42,012 $ 40,866 $ 41,689 $ 43,679 Gross profit $ 26,599 $ 25,600 $ 25,959 $ 28,678 Loss from operations $ (15,040 ) $ (15,866 ) $ (12,868 ) $ (11,723 ) Net loss attributable to PROS Holdings, Inc. $ (17,731 ) $ (18,182 ) $ (15,668 ) $ (14,230 ) Net loss attributable to common stockholders per share: Basic $ (0.60 ) $ (0.61 ) $ (0.53 ) $ (0.48 ) Diluted $ (0.60 ) $ (0.61 ) $ (0.53 ) $ (0.48 )

Summary of Significant Accoun43

Summary of Significant Accounting Policies Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 28, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Summary of Significant Accounting Policies [Line Items]
Inducement grants - Feb 2014	308,250
Tangible Asset Impairment Charges		$ 0	$ 2,890	$ 4,040
Total shareholder return period, in years, for vesting of MSUs		3 years
Shares issuable upon vesting of MSUs, maximum		200.00%
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized		$ 33,778
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition		2 years 2 months 10 days
Share-based Compensation Award, Tranche One [Member]
Summary of Significant Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards vesting upon Price Target		25.00%
Share Price Target		$ 27
Share-based Compensation Award, Tranche Two [Member]
Summary of Significant Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards vesting upon Price Target		25.00%
Share Price Target		$ 33
Share-based Compensation Award, Tranche Three [Member]
Summary of Significant Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards vesting upon Price Target		50.00%
Share Price Target		$ 41
Accounting Standards Update 2015-03 [Member]
Summary of Significant Accounting Policies [Line Items]
Debt Issuance Costs, Current, Net			100
Debt Issuance Costs, Noncurrent, Net			$ 400

Summary of Significant Accoun44

Summary of Significant Accounting Policies Awards Outstanding (Details) - shares shares in Thousands	Dec. 31, 2016	Dec. 31, 2015
Stock options
Awards outstanding [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	734	829
Restricted Stock Unit - time based [Member]
Awards outstanding [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	2,237	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
Restricted stock unit - market-based [Member]
Awards outstanding [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	460	0
Stock Appreciation Rights (SARs) [Member]
Awards outstanding [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	515	522
MSUs
Awards outstanding [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	342	563

Business Combination (Details)

Business Combination (Details) - USD ($) $ / shares in Units, $ in Thousands	Jan. 08, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs		$ 0	$ 0	$ 3,019
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual					$ 11,900
Premium to be paid per share	$ 0.15
Business combination, payment of contingent consideration		0	1,304	2,225
Goodwill		20,096	$ 20,445	21,563	$ 21,563
Business Acquisition, Goodwill, Expected Tax Deductible Amount		$ 5,800
Cameleon Acquistion [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	81.70%	100.00%
Percentage owned of outstanding warrants	94.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 18,653
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue	5,392
Business Combination, Acquisition Related Costs				1,700
Percentage ownership that triggers premium payment					95.00%
Goodwill- original estimate	16,200
Goodwill, Purchase Accounting Adjustments				500
Goodwill	15,717
Business Combination, Consideration Transferred				$ 32,000
Premium on shares [Member]
Business Acquisition [Line Items]
Business Combination, Contingent Consideration, Liability	2,700
Free shares [Member]
Business Acquisition [Line Items]
Business Combination, Contingent Consideration, Liability	$ 1,400

Business Combination Assets Acq

Business Combination Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jan. 08, 2014
Business Acquisition [Line Items]
Goodwill	$ 20,096	$ 20,445	$ 21,563
Cameleon Acquistion [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents				$ 7,086
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables				10,395
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets				1,418
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill				18,653
Goodwill				15,717
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities				(12,539)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue				(5,392)
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value			$ 0	(6,204)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net				$ 29,134

Business Combination Schedule o

Business Combination Schedule of Intangible Assets Acquired (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jan. 08, 2014
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years	2 years
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years	7 years
Maintenance relationship [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	8 years	8 years
Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years	7 years
Cameleon Acquistion [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 18,653
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets				$ 18,653
Cameleon Acquistion [Member] | Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 1,020
Finite-Lived Intangible Asset, Useful Life			8 years
Cameleon Acquistion [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 1,455
Cameleon Acquistion [Member] | Maintenance relationship [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 3,808
Finite-Lived Intangible Asset, Useful Life			8 years
Cameleon Acquistion [Member] | Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 11,147
Finite-Lived Intangible Asset, Useful Life			7 years
Cameleon Acquistion [Member] | Other Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 1,223
Finite-Lived Intangible Asset, Useful Life			2 years
Minimum [Member] | Cameleon Acquistion [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			2 years
Maximum [Member] | Cameleon Acquistion [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			5 years

Business Combination Pro Forma

Business Combination Pro Forma (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2014USD ($)$ / shares
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue	$ 186,081
Business Acquisition, Pro Forma Net Income (Loss)	$ (36,776)
Business Acquisition, Pro Forma Earnings Per Share, Basic | $ / shares	$ (1.27)

Noncontrolling interest (Detail

Noncontrolling interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2014	Jan. 08, 2014
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Noncontrolling Interest	$ 0	$ 0	$ (907)
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest	$ 0	$ 0	(922)
Cameleon Acquistion [Member]
Noncontrolling Interest [Line Items]
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value			$ 0	$ 0	$ 6,204
Noncontrolling Interest, Period Increase (Decrease)				(5,282)
Net Income (Loss) Attributable to Noncontrolling Interest				(907)
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest				$ (15)

Goodwill and Intangible Asset50

Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Amortization of Intangible Assets	$ 3,000	$ 4,800	$ 5,200
Goodwill [Roll Forward]
Goodwill	20,445	21,563
Goodwill, Translation Adjustments	(349)	(1,118)
Goodwill	$ 20,096	$ 20,445	$ 21,563

Goodwill and Intangible Asset51

Goodwill and Intangible Assets Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Translation Adjustments	$ 200	$ 1,200
Finite-Lived Intangible Assets, Gross	24,865	25,217
Finite-Lived Intangible Assets, Accumulated Amortization	12,215	11,026
Finite-Lived Intangible Assets, Net	$ 12,650	$ 14,191
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years	7 years
Finite-Lived Intangible Assets, Gross	$ 13,223	$ 14,567
Finite-Lived Intangible Assets, Accumulated Amortization	5,671	4,897
Finite-Lived Intangible Assets, Net	$ 7,552	$ 9,670
Internally Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years	2 years
Finite-Lived Intangible Assets, Gross	$ 1,106	$ 1,254
Finite-Lived Intangible Assets, Accumulated Amortization	1,106	1,245
Finite-Lived Intangible Assets, Net	$ 0	$ 9
Maintenance relationship [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	8 years	8 years
Finite-Lived Intangible Assets, Gross	$ 3,346	$ 3,591
Finite-Lived Intangible Assets, Accumulated Amortization	1,755	1,527
Finite-Lived Intangible Assets, Net	$ 1,591	$ 2,064
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years	7 years
Finite-Lived Intangible Assets, Gross	$ 4,736	$ 4,853
Finite-Lived Intangible Assets, Accumulated Amortization	2,854	2,405
Finite-Lived Intangible Assets, Net	$ 1,882	$ 2,448
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years	2 years
Finite-Lived Intangible Assets, Gross	$ 829	$ 952
Finite-Lived Intangible Assets, Accumulated Amortization	829	952
Finite-Lived Intangible Assets, Net	$ 0	$ 0
Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years
Finite-Lived Intangible Assets, Gross	$ 1,625
Finite-Lived Intangible Assets, Accumulated Amortization	0
Finite-Lived Intangible Assets, Net	$ 1,625

Goodwill and Intangible Asset52

Goodwill and Intangible Assets Future Amortization (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 2,780
Finite-Lived Intangible Assets, Amortization Expense, Year Two	3,155
Finite-Lived Intangible Assets, Amortization Expense, Year Three	3,045
Finite-Lived Intangible Assets, Amortization Expense, Year Four	3,015
Finite-Lived Intangible Assets, Amortization Expense, Year Five	648
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	7
Finite-Lived Intangible Assets, Net	$ 12,650	$ 14,191

Accounts Receivable and Contr53

Accounts Receivable and Contracts in Progress (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross	$ 31,722	$ 36,539
Unbilled Receivables, Current	2,323	3,162
Accounts Receivable, Net, Current	34,045	39,701
Allowance for Doubtful Accounts Receivable	(760)	(586)
Account and Unbilled Receivables, Net	33,285	39,115
Bad debt expense	223	(320)	$ (78)
Deferred Revenue, Revenue Recognized	470,239	415,172
Deferred Revenue and Credits	(547,654)	(477,339)
Deferred Revenue, Period Increase (Decrease)	(77,415)	(62,167)
Deferred Revenue	(79,738)	(65,329)
Deferred Maintenance and Support Revenue	25,095	23,139
Deferred Subscription Revenue	$ 36,600	$ 18,900

Earnings per Share Basis and Di

Earnings per Share Basis and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator
Net income	$ (18,513)	$ (15,708)	$ (20,527)	$ (20,477)	$ (17,731)	$ (18,182)	$ (15,668)	$ (14,230)	$ (75,225)	$ (65,811)	$ (36,644)
Denominator
Weighted average shares (basic)									30,395	29,578	28,915
Dilutive effect of potential common shares									0	0	0
Weighted Average Number of Shares Outstanding, Diluted									30,395	29,578	28,915
Basic earnings per share	$ (0.61)	$ (0.52)	$ (0.68)	$ (0.68)	$ (0.60)	$ (0.61)	$ (0.53)	$ (0.48)	$ (2.47)	$ (2.23)	$ (1.27)
Diluted earnings per share	$ (0.61)	$ (0.52)	$ (0.68)	$ (0.68)	$ (0.60)	$ (0.61)	$ (0.53)	$ (0.48)	$ (2.47)	$ (2.23)	$ (1.27)
Antidilutive potential common shares excluded from computation of earnings per share									1,769	2,206	1,954
Debt Instrument, Convertible, Stock Price Trigger									$ 33.79

Property and Equipment, net (De

Property and Equipment, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 35,939	$ 32,844
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(20,701)	(17,067)
Property, Plant and Equipment, Net	15,238	15,777
Depreciation	6,421	5,483	$ 4,999
Disposal of Property Plant and Equipment	2,258	4,357	0
Gain (Loss) on Disposition of Assets	19	167	0
Full Depreciated Assets in Use	9,285	4,119
Internal-use software development costs capitalized	1,048	233	2,305
Internal Use Software Developed, Subject To Amortization	0
Capitalized Computer Software, Amortization	0
Tangible Asset Impairment Charges	0	2,890	$ 4,040
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 2,934	2,869
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 20,321	19,069
Computer Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Computer Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 5,907	5,238
Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	6 years
Software Development [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Property, Plant and Equipment, Gross	$ 1,078	0
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	Shorter of lease term or useful life
Property, Plant and Equipment, Gross	$ 5,601	5,613
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	98	55
Cloud-based product offerings [Member]
Property, Plant and Equipment [Line Items]
Internal-use software development costs capitalized	$ 1,078	$ 251

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Treasury money market funds, at fair value	$ 106,300	$ 127,200
Short-term Investments	15,996	2,500
Commercial Paper	10,000	2,500
Deposits, Fair Value Disclosure	6,000	$ 0
Cost Method Investments, Fair Value Disclosure	$ 2,000

Stockholders Equity (Details)

Stockholders Equity (Details) $ in Millions	Dec. 31, 2016USD ($)
Stockholders' Equity Attributable to Parent [Abstract]
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 10
Stock Repurchase Program, Authorized Amount	$ 15

Noncash Share-based Compensat58

Noncash Share-based Compensation (Details) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
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	774,967
Stock options
Noncash Share-based Compensation (Narrative) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	734,000	829,000
RSU - time-based and performance-based [Member]
Noncash Share-based Compensation (Narrative) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	2,237,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number		1,939,000
SARs
Noncash Share-based Compensation (Narrative) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	515,000	522,000
MSUs
Noncash Share-based Compensation (Narrative) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	342,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	342,000	563,000
1999 Equity Incentive Plan [Member]
Noncash Share-based Compensation (Narrative) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	0	0
2007 Equity Incentive Plan [Member]
Noncash Share-based Compensation (Narrative) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	4,280,965

Noncash Share-based Compensat59

Noncash Share-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 20,466	$ 27,864	$ 22,665
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 33,778
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	2 years 2 months 10 days
Cost of revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 2,267	3,719	3,469
Selling and Marketing Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	3,824	8,536	6,514
General and Administrative Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	9,040	10,293	8,003
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	5,335	5,316	4,679
Stock compensation in operating expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 18,199	$ 24,145	$ 19,196

Noncash Share-based Compensat60

Noncash Share-based Compensation Noncash Share-based Compensation Share Based Compensation - Stock Option Rollforward (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		10 months 10 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	[1]	$ 6,712
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		734,000	829,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number		734,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price		$ 12.06
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price		12.38	$ 12.06
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price		$ 12.38
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term		10 months 10 days
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price		$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		95,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price		$ 9.55
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period		0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price		$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price		$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	[1]	$ 6,712
RSU - time-based and performance-based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number			1,939,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		1,353,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		2,237,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	[2]	$ 48,148
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		(884,000)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period		(171,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number		2,162,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value		$ 26.75
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		11.69	$ 25.29	$ 33.46
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value		26.62
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value		20.21
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value		18.05	$ 26.75
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price		$ 18.18
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term		2 years 4 months 21 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	[2]	$ 46,516
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms		2 years 4 months 27 days
Restricted stock unit - market-based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		3 years 8 months 10 days
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number		460,000	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		460,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		460,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	[2]	$ 9,899
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number		430,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value		$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		11.92
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value		0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value		0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value		11.92	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price		$ 11.92
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term		3 years 8 months 10 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	[2]	$ 9,245
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	[3]	$ 5,487
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number		515,000	522,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expired In Period, Weighted Average Grant Date Fair Value		$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number		515,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price		$ 10.86
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price		$ 10.87
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price			$ 10.87
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term		3 years 10 months 7 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		(7,000)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number		515,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value		11.42
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value		$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Expirations		0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value		$ 10.86
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price		$ 10.86
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term		3 years 10 months 7 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	[3]	$ 5,487
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value	[3]	$ 5,487
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms		3 years 10 months 7 days
Market Share Units (MSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number		342,000	563,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		153,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expired In Period, Weighted Average Grant Date Fair Value		$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		342,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	[4]	$ 7,362
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		(252,000)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period		(122,000)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value		$ 41.55
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		14.29
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value		40.58
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value		$ 44.47
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Expirations		0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value		$ 29.06	$ 41.55
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms		1 year 2 months 23 days
[1]	The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on December 31, 2016 of $21.52 and the grant date fair value.
[2]	The aggregate intrinsic value was calculated based on the fair value of the Company’s common stock on December 31, 2016 of $21.52.
[3]	Stock appreciationrights Weighted averageexercise price Weighted averageremaining contractualterm (year) Aggregateintrinsic value (1)Outstanding, December 31, 2015522 $10.87 Granted— — Exercised(7) 11.42 Forfeited— — Expired— — Outstanding, December 31, 2016515 $10.86 3.85 $5,487Exercisable at December 31, 2016515 $10.86 3.85 $5,487Vested and expected to vest at December 31, 2016515 $10.86 3.85 $5,487(1) The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on December 31, 2016 of $21.52 and the exercise price of the underlying SARs.
[4]	The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on December 31, 2016 of $21.52 and the grant date fair value of the underlying MSUs.

Noncash Share-based Compensat61

Noncash Share-based Compensation Narrative (Details) - USD ($)	1 Months Ended	12 Months Ended
	Feb. 28, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment, Minimum Employee Subscription rate		1.00%
Inducement grants - Feb 2014	308,250
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized		900,000
Total shareholder return period for vesting of MSUs		3 years
Stock Price at Year End		$ 21.52
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value		$ 1,024,000	$ 1,620,000	$ 4,520,000
Shares issuable upon vesting of MSUs, maximum		200.00%
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		15.00%	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		65,693
ESPP contributions by Employees		$ 774,000
Restricted stock unit - market-based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		460,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		460,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 11.92
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number		460,000	0
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price		$ 10.86
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number		515,000	522,000
Market Share Units (MSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		153,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		342,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 14.29
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number		342,000	563,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Inducement grants - Feb 2014		7,500
RSU - time-based and performance-based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		1,353,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		2,237,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 11.69	$ 25.29	$ 33.46
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number			1,939,000
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		383,310
2007 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		9,968,000
2007 Equity Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number		2,689,860
1999 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		0	0
2007 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		4,280,965

Noncash Share-based Compensat62

Noncash Share-based Compensation Assumptions (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period	1 year 4 days
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period	1 year 11 months 23 days
Restricted stock unit - market-based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	44.98%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.08%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%
Market Share Units (MSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	44.06%	42.06%	50.86%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.04%	0.89%	0.68%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	2 years 11 months 5 days	2 years 11 months 12 days	2 years 10 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%	0.00%	0.00%

Income Tax Disclosure Component

Income Tax Disclosure Components of Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit)	$ 19	$ (51)	$ (935)
Current State and Foreign	402	621	790
Current Income Tax Expense (Benefit)	421	570	(145)
Deferred Federal Income Tax Expense (Benefit)	51	159	12,334
Deferred State and Local Income Tax Expense (Benefit)	(2)	10	304
Income Tax Expense (Benefit)	$ 470	$ 739	$ 12,493

Income Tax Disclosure Reconcili

Income Tax Disclosure Reconciliation of Federal Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure - Reconciliation of Federal Tax Rate [Abstract]
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	$ (25,338)	$ (22,124)	$ (8,520)
Income Tax Reconciliation, State and Local Income Taxes	3	74	49
Income Tax Reconciliation, Nondeductible Expense	457	1,195	653
Income Tax Reconciliation, Nondeductible Expense, Other	(4)	(4)	434
Effective income tax reconciliation, Statutory to GAAP adjustments	(274)	119	990
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount	2	350	837
Income Tax Reconciliation, Nondeductible Expense, Share-based Compensation Cost	604	2,201	1,784
Income Tax Reconciliation, Tax Credits	(1,663)	(1,947)	(3,259)
Income Tax Reconciliation, Other Adjustments	49	(15)	19
Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance	26,634	20,890	19,506
Income Tax Expense (Benefit)	$ 470	$ 739	$ 12,493

Income Tax Disclosure Tax Effec

Income Tax Disclosure Tax Effect of Temporary Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure - Tax Effect of Temporary Differences [Abstract]
Deferred Tax Assets Property And Equipment Net	$ (2,114)	$ (2,417)
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits	8,053	10,378
Deferred Tax Assets, State Taxes	242	249
Deferred Tax Liabilities, Deferred Expense, Capitalized Software	(1,591)	(1,538)
Deferred Tax Liabilities, Intangible Assets	(2,187)	(2,289)
Deferred Tax Assets, Tax Credit Carryforwards, Research	6,852	5,696
Deferred Tax Asset, Deferred Revenue	2,265	923
Deferred Tax Assets, Operating Loss Carryforwards	40,671	20,889
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	1,517	714
Tax Credit Carryforward, Deferred Tax Asset	1,348	1,348
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	10,663	8,457
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	1,795	1,257
Deferred Tax Assets, Other	1,317	487
Deferred Tax Assets, Net, Noncurrent	68,831	44,154
Deferred Tax Assets, Valuation Allowance, Noncurrent	(69,049)	(44,321)
Deferred Tax Liabilities, Net, Noncurrent	(218)	(167)
Deferred Tax Liability, Net	$ (218)	$ (167)

Income Tax Disclosure Unrecogni

Income Tax Disclosure Unrecognized Tax Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits	$ 192	$ 192	$ 395	$ 349
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	0	21	46
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	$ 0	$ (224)	$ 0

Income Tax Disclosure (Details)

Income Tax Disclosure (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate, Continuing Operations	(1.00%)	(1.00%)	(50.00%)
Income Taxes Receivable	$ 0	$ 1,000,000
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	1,795,000	1,257,000
Operating Loss Carryforwards	170,000,000
R&E tax credit carryforward for future use	9,400,000
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	52,900,000
Unrealized excess tax benefit related to stock compensation	4,200,000
Unrecognized Tax Benefits	192,000	$ 192,000	$ 395,000	$ 349,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	0
Cameleon Acquistion [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 29,000,000

Convertible debt (Details)

Convertible debt (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)$ / shares	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Interest	$ 2,880	$ 2,875
Amortization of Financing Costs	831	795
Convertible debt, issuance cost, equity component	1,200
Debt Instrument, Fair Value Disclosure	120,012	114,122
Debt Instrument, Face Amount	143,750	143,750
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	$ 21,451	27,890
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	2.00%
Purchase of convertible bond hedge	$ 0	0	$ 29,411
Investment Warrants, Exercise Price | $ / shares	$ 45.48
Proceeds from Issuance of Warrants	$ 0	0	$ 17,106
Debt Instrument, Convertible, Conversion Ratio	29.5972
Debt Instrument, Convertible, Stock Price Trigger | $ / shares	$ 33.79
Debt Issuance Cost	$ 4,300
Convertible Debt, Noncurrent	122,299	115,860
Debt Instrument, Convertible, Carrying Amount of Equity Component	28,714	28,714
Amortization of Debt Discount (Premium)	5,608	5,244
Interest Expense, Debt	$ 9,319	$ 8,914

Credit Facility (Details)

Credit Facility (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount	$ 50,000
Debt Instrument, Covenant, Minimum Amount of Cash And Cash Equivalent	20,000
Unamortized Debt Issuance Expense	100
Amortization of Financing Costs	$ 831	$ 795
Minimum [Member] | LIBOR Rate [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.50%
Minimum [Member] | Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.50%
Maximum [Member] | LIBOR Rate [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.30%
Maximum [Member] | Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.30%

Commitments and Contingencies70

Commitments and Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Rent Expense, Net	$ 4.1	$ 3.5	$ 3.3

Commitments and Contingencies F

Commitments and Contingencies Future minimum lease commitments (Details) $ in Thousands	Dec. 31, 2016USD ($)
Future minimum lease commitments [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 3,833
Operating Leases, Future Minimum Payments, Due in Two Years	2,688
Operating Leases, Future Minimum Payments, Due in Three Years	2,263
Operating Leases, Future Minimum Payments, Due in Four Years	783
Operating Leases, Future Minimum Payments, Due in Five Years	297
Operating Leases, Future Minimum Payments, Due Thereafter	74
Operating Leases, Future Minimum Payments Due	$ 9,938

Segments International Revenue

Segments International Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
International revenue									$ 96,502	$ 104,492	$ 103,743
Revenues	$ 39,926	$ 38,384	$ 37,038	$ 37,928	$ 42,012	$ 40,866	$ 41,689	$ 43,679	$ 153,276	$ 168,246	$ 185,829
percentage of total revenue									100.00%	100.00%	100.00%
International Revenue [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
percentage of total revenue									63.00%	62.00%	56.00%
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 56,774	$ 63,754	$ 82,086
percentage of total revenue									37.00%	38.00%	44.00%
South America and Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 9,335	$ 10,680	$ 15,365
percentage of total revenue									6.00%	6.00%	8.00%
North and South America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 66,109	$ 74,434	$ 97,451
percentage of total revenue									43.00%	44.00%	52.00%
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 44,655	$ 47,514	$ 45,987
percentage of total revenue									29.00%	28.00%	25.00%
Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 30,457	$ 30,110	$ 34,170
percentage of total revenue									20.00%	18.00%	18.00%
Middle East [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 10,567	$ 14,198	$ 6,239
percentage of total revenue									7.00%	8.00%	3.00%
Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 1,488	$ 1,990	$ 1,982
percentage of total revenue									1.00%	1.00%	1.00%

Concentrations of Risk (Details

Concentrations of Risk (Details)	12 Months Ended
	Dec. 31, 2016
Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%
Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%

Employment Retirement Savings (

Employment Retirement Savings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 1.9	$ 1.8	$ 1.4
Matching Percentage of Salary Contribution by Qualified Employees	50.00%
Qualified Employees Contribution Matching Percentage by the Employer	6.00%

Quarterly Results Quarterly F75

Quarterly Results Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 39,926	$ 38,384	$ 37,038	$ 37,928	$ 42,012	$ 40,866	$ 41,689	$ 43,679	$ 153,276	$ 168,246	$ 185,829
Gross Profit	23,974	22,742	20,990	22,217	26,599	25,600	25,959	28,678	89,923	106,836	127,743
Operating Income (Loss)	(16,258)	(13,116)	(18,050)	(17,974)	(15,040)	(15,866)	(12,868)	(11,723)	(65,398)	(55,497)	(22,407)
Net Income (Loss) Attributable to Parent	$ (18,513)	$ (15,708)	$ (20,527)	$ (20,477)	$ (17,731)	$ (18,182)	$ (15,668)	$ (14,230)	$ (75,225)	$ (65,811)	$ (36,644)
Basic earnings per share	$ (0.61)	$ (0.52)	$ (0.68)	$ (0.68)	$ (0.60)	$ (0.61)	$ (0.53)	$ (0.48)	$ (2.47)	$ (2.23)	$ (1.27)
Diluted	$ (0.61)	$ (0.52)	$ (0.68)	$ (0.68)	$ (0.60)	$ (0.61)	$ (0.53)	$ (0.48)	$ (2.47)	$ (2.23)	$ (1.27)

Subsequent events (Details)

Subsequent events (Details) - USD ($) $ in Millions	Jan. 27, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Debt Instrument, Covenant, Minimum Amount of Cash And Cash Equivalent		$ 20
Revolving Credit Facility [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Covenant, Minimum Amount of Cash And Cash Equivalent	$ 50

Schedule II - Valuation and Q77

Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance		$ 586	$ 868	$ 1,060
Valuation Allowances and Reserves, Charged to Cost and Expense		887	319	8
Valuation Allowances and Reserves, Deductions	[1]	(713)	(601)	(200)
Valuation Allowances and Reserves, Charged to Other Accounts		0	0	0
Valuation Allowances and Reserves, Balance		760	586	868
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance		44,321	24,027	1,357
Valuation Allowances and Reserves, Charged to Cost and Expense		26,634	20,890	19,506
Valuation Allowances and Reserves, Deductions		0	0	0
Valuation Allowances and Reserves, Charged to Other Accounts	[2]	(1,906)	(596)	3,164
Valuation Allowances and Reserves, Balance		$ 69,049	$ 44,321	$ 24,027
[1]	Deductions column represents the reversal of additions previously charged to costs and expenses and uncollectible accounts written off, net of recoveries.
[2]	represents valuation allowance adjustments recorded as part of the purchase accounting allocation related to the PROS France and SignalDemand, Inc. acquisitions as well as cumulative translation adjustment.