PROS (PRO) 10-K 19 Feb 20 2019 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 10, 2020	Jun. 28, 2019
Entity Information [Line Items]
Document Type	10-K
Entity File Number	001-33554
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity Registrant Name	PROS HOLDINGS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	76-0168604
Entity Address, Address Line One	3100 Main Street, Suite 900
Entity Address, City or Town	Houston,
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77002
City Area Code	713
Local Phone Number	335-5151
Title of 12(b) Security	Common Stock, $0.001 par value per share
Trading Symbol	PRO
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 2,219,582,301
Entity Common Stock, Shares Outstanding		43,006,462
Entity Central Index Key	0001392972
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 306,077	$ 295,476
Trade and other receivables, net of allowance of $214 and $978, respectively	65,074	41,822
Deferred Costs, Current	5,756	4,089
Prepaid and other current assets	9,038	4,756
Total current assets	385,945	346,143
Property and equipment, net	14,794	14,676
Operating Lease, Right-of-Use Asset	26,550	0
Deferred Costs, Noncurrent	15,478	13,373
Intangible Assets, Net (Excluding Goodwill)	14,605	19,354
Goodwill	49,104	38,231
Other Assets, Noncurrent	6,831	5,190
Total assets	513,307	436,967
Current liabilities:
Accounts payable	9,098	6,934
Accrued liabilities	22,748	9,506
Accrued payroll and other employee benefits	32,656	22,519
Operating Lease, Liability, Current	7,173	0
Deferred Revenue, Current	124,459	99,262
Convertible Debt, Current	0	136,529
Total current liabilities	196,134	274,750
Deferred Revenue, Noncurrent	17,801	17,903
Convertible Debt, Noncurrent	110,704	88,661
Operating Lease, Liability, Noncurrent	22,391	0
Other Liabilities, Noncurrent	1,281	754
Total liabilities	348,311	382,068
Commitments and contingencies (Note 18)
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; 47,310,846 and 41,573,491 shares issued, respectively; 42,630,123 and 37,155,906 shares outstanding, respectively	47	42
Additional paid-in capital	560,496	364,877
Treasury stock, 4,680,723 and 4,417,585 common shares, at cost, respectively	(29,847)	(13,938)
Retained Earnings (Accumulated Deficit)	(361,789)	(292,708)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3,911)	(3,374)
Total stockholders' equity	164,996	54,899
Total liabilities and stockholders' equity	$ 513,307	$ 436,967

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for bad debts	$ 214,000	$ 978,000
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	47,310,846	41,573,491
Common stock - shares outstanding	42,630,123	37,155,906
Treasury stock - shares	4,680,723	4,417,585

Condensed Consolidated Statemen

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Total subscription, maintenance and support revenue	$ 199,349	$ 159,952	$ 129,947
Total Revenue	250,334	197,024	168,816
Cost of revenue:
Cost of Goods and Services Sold	99,117	77,179	68,566
Cost of subscription, maintenance and support	53,142	46,970	39,551
Gross profit	151,217	119,845	100,250
Operating Expenses
Selling and Marketing Expense	89,553	72,006	68,116
General and Administrative Expense	47,254	41,302	40,336
Research and development	67,246	55,657	56,021
Business Combination, Acquisition Related Costs	502	95	720
Income from operations	(53,338)	(49,215)	(64,943)
Other income (expense):
Convertible debt interest and amortization	(14,765)	(16,986)	(13,218)
Other Nonoperating Income (Expense)	(354)	2,155	384
Income (loss) before income tax provision	(68,457)	(64,046)	(77,777)
Income Tax Expense (Benefit)	624	200	149
Net Income (Loss) Attributable to Parent	$ (69,081)	$ (64,246)	$ (77,926)
Net earnings (loss) per share:
Earnings Per Share, Basic and Diluted	$ (1.72)	$ (1.86)	$ (2.46)
Weighted average number of shares:
Weighted Average Number of Shares Outstanding, Basic and Diluted	40,232	34,465	31,627
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	$ (537)	$ (558)	$ 2,107
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax	0	0	(13)
Other Comprehensive Income (Loss), Net of Tax	(537)	(558)	2,094
Other comprehensive income, net of tax:
Comprehensive income (loss)	(69,618)	(64,804)	(75,832)
Subscription and Circulation [Member]
Revenue from Contract with Customer, Including Assessed Tax	141,165	95,192	60,539
Cost of revenue:
Cost of Goods and Services Sold	42,090	35,368	27,858
Maintenance [Member]
Revenue from Contract with Customer, Including Assessed Tax	58,184	64,760	69,408
Cost of revenue:
Cost of Goods and Services Sold	11,052	11,602	11,693
License [Member]
Revenue from Contract with Customer, Including Assessed Tax	4,162	3,516	5,562
Cost of revenue:
Cost of Goods and Services Sold	249	251	282
Service [Member]
Revenue from Contract with Customer, Including Assessed Tax	46,823	33,556	33,307
Cost of revenue:
Cost of Goods and Services Sold	$ 45,726	$ 29,958	$ 28,733

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities:
Net Income (Loss) Attributable to Parent	$ (69,081)	$ (64,246)	$ (77,926)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, Depletion and Amortization	13,870	13,055	10,531
Amortization of Financing Costs and Discounts	11,115	12,027	9,264
Share-based compensation	24,680	21,453	22,796
Deferred income tax	(119)	(463)	(520)
Provision for doubtful accounts	(754)	212	0
Loss on Disposition of Assets	0	37	59
Loss on Extinguishment of Debt	5,660	0	0
Changes in operating assets and liabilities:
Accounts and unbilled receivables	(22,273)	(9,550)	2,022
Increase (Decrease) in Deferred Costs	(3,772)	(4,086)	0
Prepaid expenses and other assets	(5,044)	87	(3,715)
Accounts payable	2,489	3,931	700
Accrued liabilities	15,455	2,764	(1,055)
Accrued payroll and other employee benefits	7,937	5,830	(2,344)
Deferred revenue	25,082	24,652	14,875
Net cash (used in) provided by operating activities	5,245	5,703	(25,313)
Investing activities:
Purchases of property and equipment	(5,271)	(1,475)	(1,286)
Payments to Acquire Other Investments	(293)	(45)	0
Capitalized Software Development Costs for Software Sold to Customers	(1,436)	(4,613)	(2,797)
Payments to Acquire Intangible Assets	(50)	(125)	(125)
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale	0	0	15,992
Net cash (used in) provided by investing activities	(17,560)	(6,258)	(22,346)
Financing activities:
Exercise of stock options	0	1,142	6,331
Proceeds from Stock Plans	1,995	1,720	1,535
Tax withholding related to net share settlement of restricted stock units	(23,753)	(9,410)	(7,375)
Proceeds from Issuance of Common Stock	0	141,954	0
Repayments of Notes Payable	0	(54)	(209)
Proceeds from Convertible Debt	140,156	0	93,500
Purchase of capped call	(16,445)	0	0
Payment for Debt Extinguishment or Debt Prepayment Cost	(97,678)	0	0
Proceeds from bond hedge termination	64,819	0	0
Payment for warrant termination	(45,243)	0	0
Net cash (used in) provided by financing activities	22,991	135,352	90,654
Effect of Exchange Rate on Cash and Cash Equivalents	(75)	174	(529)
Net change in cash and cash equivalents	10,601	134,971	42,466
Cash and cash equivalents:
Beginning of period	295,476	160,505	118,039
End of period	306,077	295,476	160,505
Income Taxes Paid, Net	(308)	(262)	(271)
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	(3,499)	(5,252)	(4,013)
Capital Expenditures Incurred but Not yet Paid	891	247	38
Travelaer Acquisition [Member]
Investing activities:
Payments to Acquire Businesses, Net of Cash Acquired	(10,510)	0	0
Vayant Acquisition [Member]
Investing activities:
Payments to Acquire Businesses, Net of Cash Acquired	0	0	(34,130)
Convertible Debt [Member]
Financing activities:
Payments of Debt Issuance Costs	(860)	0	(2,978)
Revolving Credit Facility [Member]
Financing activities:
Payments of Debt Issuance Costs	$ 0	$ 0	$ (150)

Consolidated Statement of Share

Consolidated Statement of Shareholders Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock, Common [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income, net of tax [Member]
Common stock - shares outstanding, beginning balance at Dec. 31, 2016		30,583,651
Stockholders' Equity Attributable to Parent at Dec. 31, 2016	$ (3,394)	$ 35	$ 175,678		$ (13,938)	$ (160,259)	$ (4,910)
Treasury stock - shares, beginning balance at Dec. 31, 2016					4,417,585
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, New Issues		651,607
Exercise of stock options		$ 1
Proceeds from Stock Options Exercised	6,331		6,330
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		611,708
Stock Issued During Period, Value, Restricted Stock Award, Gross	(7,375)		(7,375)
Stock Issued During Period, Shares, Employee Stock Purchase Plans		92,209
Proceeds from Stock Plans	1,535		1,535
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	22,910		22,910
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	8,846		8,846
Purchase of capped call	0
Share-based Payment Arrangement, Noncash Expense	22,796
Other Comprehensive Income (Loss), Net of Tax	2,094						2,094
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	2,107
Net Income (Loss) Attributable to Parent	(77,926)					(77,926)
Stockholders' Equity Attributable to Parent at Dec. 31, 2017	(46,979)	$ 36	207,924		$ (13,938)	(238,185)	(2,816)
Treasury stock - shares, ending balance at Dec. 31, 2017					4,417,585
Common stock - shares outstanding, ending balance at Dec. 31, 2017		31,939,175
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, New Issues		161,997
Exercise of stock options		$ 1
Proceeds from Stock Options Exercised	1,142		1,141
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		609,188
Stock Issued During Period, Value, Restricted Stock Award, Gross	(9,410)	$ 1	(9,411)
Stock Issued During Period, Shares, Employee Stock Purchase Plans		75,546
Proceeds from Stock Plans	1,720		1,720
Stock Issued During Period, Shares, Secondary Offering		4,370,000
Stock Issued During Period, Value, Secondary Offering		$ 4
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	21,553		21,553
Cumulative effect of adoption of section 606	9,723					9,723
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	141,954		141,950
Purchase of capped call	0
Share-based Payment Arrangement, Noncash Expense	21,453
Other Comprehensive Income (Loss), Net of Tax	(558)						(558)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(558)
Net Income (Loss) Attributable to Parent	(64,246)					(64,246)
Stockholders' Equity Attributable to Parent at Dec. 31, 2018	$ 54,899	$ 42	364,877		$ (13,938)	(292,708)	(3,374)
Treasury stock - shares, ending balance at Dec. 31, 2018	4,417,585				4,417,585
Common stock - shares outstanding, ending balance at Dec. 31, 2018	37,155,906	37,155,906
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Proceeds from Stock Options Exercised	$ 0
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		958,264
Stock Issued During Period, Value, Restricted Stock Award, Gross	$ (23,753)	$ 1	(23,754)
Stock Issued During Period, Shares, Employee Stock Purchase Plans	75,304	75,304
Proceeds from Stock Plans	$ 1,995		1,995
Stock Issued During Period, Shares, Secondary Offering		4,703,787
Stock Issued During Period, Value, Secondary Offering	140,849	$ 4	140,845
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	24,608		24,608
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	32,883		32,883
Stock Repurchased During Period, Shares		(263,138)
Adjustment to additional paid-in capital, exercise of note hedge	2		15,911
Treasury Stock, Shares, Acquired				263,138
Treasury Stock, Value, Acquired, Cost Method				$ (15,909)
Adjustment to additional paid in capital, termination of bond hedge and warrant	64,819		64,819
Adjustment to additional paid in capital, termination of warrant	(45,243)		(45,243)
Adjustment to additional paid in capital, purchase of capped call	(16,445)		(16,445)
Purchase of capped call	16,445
Share-based Payment Arrangement, Noncash Expense	24,680
Other Comprehensive Income (Loss), Net of Tax	(537)						(537)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(537)
Net Income (Loss) Attributable to Parent	(69,081)					(69,081)
Stockholders' Equity Attributable to Parent at Dec. 31, 2019	$ 164,996	$ 47	$ 560,496		$ (29,847)	$ (361,789)	$ (3,911)
Treasury stock - shares, ending balance at Dec. 31, 2019	4,680,723				4,680,723
Common stock - shares outstanding, ending balance at Dec. 31, 2019	42,630,123	42,630,123

Organization and Nature of Oper

Organization and Nature of Operations	12 Months Ended
	Dec. 31, 2019
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 artificial intelligence ("AI") solutions that power commerce in the digital economy by providing fast, frictionless and personalized buying experiences. PROS solutions enable dynamic buying experiences for both business-to-business ("B2B") and business-to-consumer ("B2C") companies across industry verticals. Companies can use the Company's selling, pricing, revenue optimization and eCommerce solutions to assess their market environments in real time to deliver customized prices and offers. The Company's solutions enable buyers to move fluidly across its customers’ direct sales, online, mobile and partner channels with personalized experiences regardless of which channel those buyers choose. The Company's decades of data science and AI expertise are infused into its solutions and are designed to reduce time and complexity through actionable intelligence. The Company provides standard configurations of its software based on the industries it serves and offers professional services to configure these solutions to meet the specific needs of each customer.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	Summary of Significant Accounting Policies Principles of Consolidation and Basis of Presentation These 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 have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP"). Changes in Accounting Policies The Company has consistently applied the accounting policies described in this Note 2 to all periods presented in these Consolidated Financial Statements, except for the Company's adoption of certain accounting standards described in more detail under " Recently adopted accounting pronouncements " in this Note 2 below. 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 preparation of these Consolidated Financial Statements in conformity with GAAP requires the Company to make certain estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenues, costs and expenses during the reporting period. The complexity and judgment required in the Company's estimation process, as well as issues related to the assumptions, risks and uncertainties inherent in determining the nature and timing of satisfaction of performance obligations and determining the standalone selling price of performance obligations, affect the amounts of revenue, expenses, unbilled receivables and deferred revenue. Estimates are also used for, but not limited to, receivables, allowance for doubtful accounts, the determination of the period of benefit for deferred commissions, operating lease right-of-use assets and operating lease liabilities, useful lives of assets, depreciation and amortization, 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. Numerous internal and external factors can affect estimates. Actual results could differ from those estimates and such differences could be material to the Company's consolidated financial position and results of operations. 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, if any. The Company has a cash management program that provides for the investment of excess cash balances, primarily in short-term money market instruments. Trade and Other Receivables Trade and other receivables are primarily comprised of trade receivables, net of allowance for doubtful accounts, contract assets and unbilled receivables. The Company records trade accounts receivable for its unconditional rights to consideration arising from the Company's performance under contracts with customers. The Company's standard billing terms are that payment is due upon receipt of invoice, payable generally within thirty to sixty days. The carrying value of such receivables, net of the allowance for doubtful accounts, represents their estimated net realizable value. The Company estimates its allowance for doubtful accounts for specific trade receivable balances based on historical collection trends, the age of outstanding trade receivables, existing economic conditions, and any financial security associated with the receivables. Contract assets represent conditional rights to consideration that have been recognized as revenue in advance of billing the customer. Unbilled receivables represent unconditional rights to consideration arising from contingent revenue that have been recognized as revenue in advance of billing the customer. Prepaid Expenses and Other Assets Prepaid expenses and other assets consist primarily of prepaid third-party software subscription and license fees, deferred project costs and prepaid income taxes. 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 (Loss) 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 and coding. 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. Leases The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use ("ROU") assets, current operating lease liabilities and noncurrent operating lease liabilities in the Company's Consolidated Balance Sheet. ROU assets represent the Company’s right to use an underlying asset over the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. ROU assets and lease liabilities are recognized at the lease commencement date based on the estimated present value of lease payments over the lease term. The Company includes any anticipated lease incentives in the determination of lease liability. The Company uses its estimated incremental borrowing rate, which is derived from information available at the lease commencement date, in determining the present value of lease payments. The Company gives consideration to its recent debt issuances as well as publicly available data for instruments with similar characteristics when determining its incremental borrowing rates. The Company’s lease terms will include options to extend the lease when it is reasonably certain that the Company will exercise that option. Leases with a term of 12 months or less are not recorded on the Company's unaudited condensed consolidated balance sheet. The Company’s lease agreements do not contain any residual value guarantees. Deferred Costs Sales commissions earned by the Company's sales representatives are considered incremental and recoverable costs of obtaining a customer contract. Sales commissions are deferred and amortized on a straight-line basis over the period of benefit, which the Company has determined to be five to eight years. The Company determined the period of benefit by taking into consideration its customer contracts, expected renewals of those customer contracts (as the Company currently does not pay an incremental sales commission), the Company's technology and other factors. The Company also defers amounts earned by employees other than sales representatives who earn incentive payments under compensation plans that are also tied to the value of customer contracts acquired. Deferred Implementation Costs The Company capitalizes certain contract fulfillment costs, including employee-related and other costs (such as hosting, employee salaries, benefits and payroll taxes), that are associated with arrangements where professional services are not distinct from other undelivered obligations in its customer contracts. The Company analyzes implementation costs and capitalizes those costs that are directly related to customer contracts that are expected to be recoverable and enhance the resources which will be used to satisfy the undelivered performance obligations in those contracts. Deferred implementation costs are amortized ratably over the remaining contract term once the revenue recognition criteria for the respective performance obligation has been met and revenue recognition commences. Deferred implementation costs are included in prepaid and other current assets and other assets, noncurrent in the Consolidated Balance Sheets. Amortization of deferred implementation costs is included in cost of subscription and cost of services revenues in the Consolidated Statements of Comprehensive Income (Loss). Deferred Revenue Deferred revenue primarily consists of customer invoicing in advance of revenues being recognized. The Company generally invoices its customers annually in advance for subscription services and maintenance and support services. Deferred revenue that is anticipated to be recognized during the next twelve-month period is recorded as current deferred revenue and the remaining portion is recorded as noncurrent deferred revenue. 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 did not identify any impairment indicators and recorded no impairment charges in the year ended December 31, 2019 , 2018 and 2017 . 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 the intangible 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 the intangible 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 sole reporting unit has been reduced below its carrying value. When conducting the annual goodwill impairment assessment, a two-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 sole 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 the Company to compare the fair value of its reporting unit with its carrying value. If the carrying amount exceeds the fair value, an impairment charge will be recognized, however, loss cannot exceed the total amount of goodwill allocated to the reporting unit. Based on the results of the qualitative review of goodwill performed as of November 30, 2019, the Company did not identify any indicators of impairment. As such, the quantitative assessment described above was not necessary. Equity Investments 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 at cost, less impairment and adjusted for subsequent observable price changes obtained from orderly transactions for identical or similar investments issued by the same investee. Adjustments resulting from impairment, fair value, or observable price changes are accounted for in the Consolidated Statements of Comprehensive Income (Loss). Financial Instruments The carrying amount of the Company’s financial instruments, which include cash equivalents, receivables and accounts payable, and equity investments approximates their fair values at December 31, 2019 and 2018 . For additional information on the Company’s fair value measurements, see Note 10 to the Consolidated Financial Statements. Convertible Senior Notes In accounting for the issuance of the Notes, the Company separates each of the Notes into liability and equity components. The carrying amounts of the liability components are calculated by measuring the fair value of similar liabilities that do not have associated convertible features. The carrying amount of the equity components representing the conversion option are determined by deducting the fair value of the liability components from the par value of the respective Notes. These differences represent debt discounts that are amortized to interest expense over the respective terms of the Notes using the effective interest rate method. The equity components are not remeasured as long as they continue to meet the conditions for equity classification. In accounting for the issuance costs related to the Notes, the Company allocates the total amount of issuance costs incurred to the liability and equity components based on their relative values. Issuance costs attributable to the liability components are being amortized on a straight-line basis, which approximates the effective interest rate method, to interest expense over the respective terms of the Notes. The issuance costs attributable to the equity components are netted against the respective equity components in additional paid-in capital. 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 12 to the Consolidated Financial Statements. There were no treasury stock repurchases under the program for the years ended December 31, 2019 , 2018 and 2017 . Revenue Recognition The Company derives its revenues primarily from subscription services, professional services, perpetual licensing of its software products and associated software maintenance and support services. The Company determines revenue recognition through the following steps: • Identification of the contract, or contracts, with a customer; • Identification of the performance obligations in the customer contract(s); • Determination of the transaction price; • Allocation of the transaction price to each performance obligation in the customer contract(s); and • Recognition of revenue when, or as, the Company satisfies a performance obligation. Subscription services revenue Subscription services primarily include customer access to one or more of the Company's cloud applications and associated customer support. Subscription services revenue is generally recognized ratably over the contractual subscription term, beginning on the date that the Company's subscription service is made available to the customer. The Company's subscription contracts do not provide customers with the right to take possession of the software supporting the service and, as a result, are accounted for as service contracts. The Company's subscription contracts are generally two to five years in length, billed annually in advance, and non-cancelable. Maintenance and support revenue Maintenance and support revenue includes post-implementation customer support for on-premises licenses and the right to unspecified software updates and enhancements. The Company recognizes revenue from maintenance and support arrangements ratably over the period in which the services are provided. The Company's maintenance and support contracts are generally one to three years in length, billed annually in advance, and non-cancelable. License revenue Licenses to on-premises software provide the customer with a right to use, in the customer's environment, the Company's software as it exists when made available to the customer. License revenue from customer contracts with distinct on-premises licenses is recognized at the point in time when the software is made available to the customer. For customer contracts that contain license and professional services that are not considered distinct, both the license and professional services are determined to be a single performance obligation and the revenue is recognized over time based upon the Company's efforts to satisfy the performance obligation. Professional services revenue Professional services revenue primarily consists of fees for deployment and configuration services, as well as training services. Professional services revenue is generally recognized as the services are rendered for time and material contracts, or on a proportional performance basis for fixed fee contracts. The majority of the Company's professional services contracts are on a fixed fee basis. Training revenue is recognized as the services are rendered. Significant judgment is required in determining whether professional services contained in a customer subscription services contract are capable of being distinct and are separately identifiable in the customer contract. Professional services determined to be distinct are accounted for as a separate performance obligation and revenue is recognized as the services are performed. If the professional services are not determined to be distinct, the professional services and the subscription services are accounted for as a single performance obligation and revenue is recognized over the contractual term of the subscription beginning on the date that subscription services are made available to the customer. Customer contracts with multiple performance obligations A portion of the Company's customer contracts contain multiple performance obligations. Significant judgment is required in determining whether multiple performance obligations contained in a single customer contract are capable of being distinct and are separately identifiable. An obligation determined to be distinct is accounted for as a separate performance obligation and revenue for that separate performance obligation is recognized when, or as, the Company satisfies the performance obligation. If obligations are not determined to be distinct, those obligations are accounted for as a single, combined performance obligation. The transaction price is allocated to each performance obligation on a relative standalone selling price basis. Disaggregation of revenue The Company categorizes revenue from external customers by geographic area based on the location of the customer's headquarters. For additional information regarding the Company's revenue by geography, see Note 19 to the Consolidated Financial Statements. 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 income (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 2007 Equity Incentive Plan ("2007 Stock Plan") and the 2017 Equity Incentive Plan ("2017 Stock Plan"), which authorize the discretionary granting of various types of stock awards to key employees, officers, directors and consultants. The 2007 Stock Plan expired in March 2017. The 2017 Stock Plan serves as the successor to the 2007 Stock Plan and was adopted in May 2017. 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, such as market stock units ("MSUs"). To date, the Company has granted stock options, SARs, RSUs, time, performance and market-based, and MSUs. The Company issues common stock from its pool of authorized stock upon exercise of stock options, settlement of SARs and MSUs or upon vesting of RSUs. The following table presents the number of awards outstanding for each award type as of December 31, 2019 and 2018 (in thousands): Year Ended December 31, Award type 2019 2018 Restricted stock units (time-based) 1,893 1,969 Restricted stock units (performance-based) 114 — Restricted stock units (market-based) — 215 Stock appreciation rights 65 287 Market stock units 267 419 Stock options. The Company did not grant stock options during 2019 and 2018 . The fair value of each stock option is 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 achievement of certain internal performance metrics set by the Company, 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, delivery of 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 3 -year period ending February 28, 2019, February 28, 2020, October 9, 2020 and December 31, 2020 ("Performance Period"), respectively. The MSUs vested on March 1, 2019, and will vest on March 1, 2020, October 9, 2020 and January 10, 2021, 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 the 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, 2019 , there were an estimated $43.1 million of total unrecognized compensation costs related to noncash share-based compensation arrangements. These costs will be recognized over a weighted average period of 2.5 years. For further discussion of the Company’s noncash share-based compensation plans, see Note 14 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-premises 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 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 15 to the Consolidated Financial Statements. 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 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 giving effect to all dilutive potential common shares outstanding during the period using the treasury stock method and convertible notes using the if-converted method. Dilutive potential common shares consist of shares issuable upon the exercise of stock options, shares of unvested restricted stock units and market 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, market stock units and convertible notes 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. Recently Adopted Accounting Pronouncements In February 2016, the FASB issued ASU 2016-02, " Leases (Topic 842) " ("Topic 842"), which requir

Business Combination

Business Combination	12 Months Ended
	Dec. 31, 2019
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	Business Combination Travelaer On August 14, 2019, the Company acquired Travelaer SAS ("Travelaer"), a privately held company based near Nice, France, for a total cash consideration, net of cash acquired, of approximately $10.5 million . Travelaer is a digital innovator for the travel industry with a focus on improving the customer experience across all phases of travel, and brings an internet booking engine and NDC platform to the Company's portfolio. The Company has included the financial results of Travelaer in the Consolidated Financial Statements from the date of the acquisition, which have not been material to date. The transaction cost associated with the acquisition was $0.5 million for the year ended December 31, 2019 . The Company accounted for the transaction as a business combination and all of the assets acquired and the liabilities assumed in the transaction have been recognized at their acquisition date fair values. The Company recorded approximately $2 million for developed technology and customer relationships with estimated useful lives of seven years and five years , respectively. The Company recorded approximately $11 million of goodwill which is primarily related to the assembled workforce and expanded market opportunities from integrating Travelaer's technology with the Company's solutions. The goodwill balance is not deductible for U.S. income tax purposes. The Company expects to finalize the valuation as soon as practicable, but no later than one year from the acquisition date. Vayant On August 3, 2017, the Company acquired 100% of the issued and outstanding stock of Vayant , a privately held company based in Sofia, Bulgaria, for total cash consideration, net of cash acquired, of approximately $34.1 million . Vayant is a cloud software company that provides advanced shopping, merchandising and inspirational travel solutions. Since the acquisition date, the Company included $3.3 million of revenue and $1.8 million of net loss related to Vayant in its Consolidated Statement of Comprehensive Income (Loss) for the year ended December 31, 2017. During the years ended December 31, 2018 and 2017 , the Company incurred acquisition-related costs of $0.1 million and $0.7 million , respectively, primarily related to advisory and legal fees, accounting and professional fees, and retention of key employees. All of the assets acquired and the liabilities assumed in the transaction have been recognized at their acquisition date fair values at August 3, 2017. The final allocation of the total purchase price for Vayant is as follows (in thousands): Cash $ 1,822 Other current assets 1,235 Noncurrent assets 86 Intangibles 18,600 Goodwill 17,052 Accounts payable and accrued liabilities (1,668 ) Deferred revenue (600 ) Deferred tax liability (526 ) Noncurrent liabilities (49 ) Net assets acquired $ 35,952 The following are the identifiable intangible assets acquired (in thousands) and their respective useful lives: Useful Life Amount (years) Developed technology $ 11,600 7 Customer relationships 7,000 5 Total $ 18,600 In performing the Vayant 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 Vayant's products and services. The allocation resulted in acquired intangible assets of $18.6 million . The acquired intangible assets consisted of developed technology and customer relationships 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 Vayant acquisition, including deferred revenue to which a fair value of $0.6 million was ascribed using a cost-plus profit approach. The Company made a preliminary determination that $0.5 million of net deferred tax liabilities were assumed on the Vayant acquisition date. During the year ended December 31, 2018, the Company made a final determination upon filing of the pre-acquisition period tax return that $0.8 million of net deferred tax liabilities were assumed on the Vayant acquisition date. The measurement period adjustment of $0.3 million to the deferred tax liabilities recorded during the year ended December 31, 2018 resulted in an increase to the goodwill, a release of additional valuation allowance and a benefit to the income tax provision. The excess of the purchase price over the estimated amounts of net assets as of the effective date of the acquisition was allocated to goodwill. The factors contributing to the recognition of the amount of goodwill are based on several strategic and synergistic benefits that are expected to be realized from the Vayant acquisition. These benefits include the expectation that the combined company’s complementary products will strengthen the Company's modern commerce solutions for the travel industry. 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. None of the goodwill is expected to be currently deductible for tax purposes. In accordance with applicable accounting standards, goodwill will not be amortized but instead will be 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 a charge for the amount of the impairment during the fiscal quarter in which the impairment occurs. Pro Forma Financial Information The unaudited financial information in the table below summarizes the combined results of operations of the Company and Vayant, on a pro forma basis, as though the Company had acquired Vayant on January 1, 2016. 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, except earnings per share) 2017 Total revenue $ 173,866 Net loss (81,476 ) Earnings per share - basic and diluted $ (2.58 )

Trade and Other Receivables, Ne

Trade and Other Receivables, Net	12 Months Ended
	Dec. 31, 2019
Accounts Receivable and Contracts in Progress [Abstract]
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	Receivables, Net Accounts receivable at December 31, 2019 and 2018 , consists of the following (in thousands): December 31, 2019 2018 Accounts receivable $ 59,606 $ 38,876 Unbilled receivables and contract assets 5,682 3,924 Total receivables 65,288 42,800 Less: Allowance for doubtful accounts (214 ) (978 ) Trade and other receivables, net $ 65,074 $ 41,822 The bad debt expense reflected in general and administrative expenses in the accompanying Consolidated Statements of Comprehensive Income (Loss) for the years ended December 31, 2019 , 2018 and 2017 , totaled approximately $(0.6) million , $0.2 million and zero , respectively.

Deferred Costs (Notes)

Deferred Costs (Notes)	12 Months Ended
	Dec. 31, 2019
Deferred Costs [Abstract]
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]	Deferred Costs Deferred costs, which primarily consist of deferred sales commissions, were $21.2 million and $17.5 million as of December 31, 2019 and December 31, 2018 , respectively. Amortization expense for the deferred costs was $4.8 million and $3.0 million for the year ended December 31, 2019 and 2018 , respectively. There was no impairment loss in relation to the costs capitalized for the periods presented.

Deferred Implementation costs (

Deferred Implementation costs (Notes)	12 Months Ended
	Dec. 31, 2019
Deferred Implementation Costs [Abstract]
Deferred Implementation Costs [Text Block]	Deferred Implementation Costs Deferred implementation costs, which related to certain customer contract fulfillment costs, were $4.4 million and $3.9 million as of December 31, 2019 and December 31, 2018 , respectively. Amortization expense for the deferred implementation costs was $1.4 million and $0.6 million for the year ended December 31, 2019 and 2018 , respectively. Deferred implementation costs are included in prepaid and other current assets and other assets, noncurrent in the Consolidated Balance Sheets. Amortization of deferred implementation costs is included in cost of subscription and cost of services revenues in the Consolidated Statements of Comprehensive Income (Loss). There was no impairment loss in relation to the costs capitalized for the periods presented.

Property and Equipment, net

Property and Equipment, net	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment Disclosure [Text Block]	Property and Equipment, Net Property and equipment, net as of December 31, 2019 and 2018 consists of the following: December 31, Estimated useful life 2019 2018 Furniture and fixtures 5-10 years $ 3,227 $ 3,208 Computers and equipment 3-5 years 15,388 19,644 Software 3-6 years 7,302 5,432 Capitalized internal-use software development costs 3 years 10,194 8,775 Leasehold improvements Shorter of lease term or useful life 5,591 5,587 Construction in progress 794 20 Property and equipment, gross 42,496 42,666 Less: Accumulated depreciation and amortization (27,702 ) (27,990 ) Property and equipment, net $ 14,794 $ 14,676 Depreciation and amortization was approximately $7.1 million , $5.5 million and $5.4 million for the years ended December 31, 2019 , 2018 and 2017 , respectively. During the years ended December 31, 2019 , 2018 and 2017 , the Company disposed of approximately $7.4 million , $0.5 million and $1.8 million , respectively, of fully depreciated assets. During the year ended December 31, 2019 , the Company recognized no loss on disposal of assets and during the years ended 2018 and 2017 , the Company recognized immaterial amounts of loss on disposal of certain non-fully depreciated assets, respectively. As of December 31, 2019 and 2018 , the Company had approximately $12.2 million and $14.0 million , respectively, of fully depreciated assets in use. During the years ended December 31, 2019 and 2018 , the Company capitalized internal-use software development costs of approximately $1.4 million and $4.7 million , respectively, related to its subscription solutions. As of December 31, 2019 and 2018 , $9.6 million and $2.8 million , respectively, of capitalized internal-use software development costs were subject to amortization and $4.1 million and $1.1 million , respectively, of capitalized internal-use software development costs were included in accumulated depreciation and amortization for the years ended December 31, 2019 and 2018 . No impairment was recorded for the years ended December 31, 2019 , 2018 and 2017

Leases (Notes)

Leases (Notes)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Lessee, Operating Leases [Text Block]	Leases The Company has operating leases for data centers, computer infrastructure, corporate offices and certain equipment. These leases have remaining lease terms ranging from 1 year to 14 years . Some of these leases include options to extend for up to 15 years, and some include options to terminate within 1 year. The Company includes options in the lease terms when it is reasonably certain that the Company will exercise that option. In July 2019, the Company amended its existing agreement with a computing infrastructure vendor, the result of which was an increase in future consideration to be paid by the Company. The Company accounted for this change in consideration as a modification and remeasured the value of the right-of-use asset and related lease liability on such date, which resulted in an increase of $5.7 million to each respectively. As of December 31, 2019 , the Company did not have any finance leases. The components of operating lease expense were as follows (in thousands): Year Ended December 31, 2019 Operating lease cost $ 10,109 Variable lease cost 1,810 Sublease income (332 ) Total lease cost $ 11,587 Supplemental information related to leases was as follows (in thousands): Year Ended December 31, 2019 Cash paid for amounts included in the measurement of lease liability: Operating cash flows from operating leases $ 5,883 December 31, 2019 Weighted average remaining lease term: Operating leases 7.1 years Weighted average discount rate: Operating leases 7.26 % As of December 31, 2019 , maturities of lease liabilities were as follows (in thousands): Year Ending December 31, Amount 2020 $ 6,965 2021 8,745 2022 8,202 2023 4,630 2024 4,680 2025 and thereafter 34,059 Total operating lease payments 67,281 Less: Imputed interest (23,510 ) Less: Anticipated lease incentive (14,207 ) Total operating lease liabilities $ 29,564 As of December 31, 2019 , the Company has additional operating leases of approximately $1.5 million that have not yet commenced, as the lessor has not made the underlying assets available for use by the Company. These operating leases will commence in fiscal year 2020 with lease terms of 5 years to 14 years . Operating lease expense was $4.3 million and $3.9 million for the years ended December 31, 2018 and 2017, respectively, under Topic 840, the predecessor of Topic 842. As of December 31, 2018, the future minimum lease commitments related to lease agreements under Topic 840 were as follows: Year Ending December 31, Amount 2019 $ 4,164 2020 1,649 2021 5,115 2022 6,181 2023 5,679 2024 and thereafter 57,365 Total minimum lease payments $ 80,153

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2019
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, 2019 and 2018 , was as follows (in thousands): Balance as of December 31, 2017 $ 38,458 Purchase accounting adjustments 252 Foreign currency translation adjustments (479 ) Balance as of December 31, 2018 38,231 Goodwill acquired 11,077 Foreign currency translation adjustments (204 ) Balance as of December 31, 2019 $ 49,104 The goodwill balance related to PROS France and Travelaer is denominated in Euro and the goodwill balance related to Vayant is denominated in the U.S. dollar. Intangible assets consisted of the following as of December 31, (in thousands): December 31, 2019 Weighted average useful life (years) Gross Carrying Amount Accumulated Amortization* Net Carrying Amount Developed technology 7 $ 26,839 $ 17,653 $ 9,186 Maintenance relationships 8 3,451 2,790 661 Customer relationships 6 12,439 8,478 3,961 Acquired technology 2 1,925 1,128 797 Total $ 44,654 $ 30,049 $ 14,605 *Cumulative foreign currency translation adjustments, reflecting movement in the currencies of the underlying entities, decreased total intangible assets by approximately $0.1 million as of December 31, 2019 . December 31, 2018 Weighted average useful life (years) Gross Carrying Amount Accumulated Amortization* Net Carrying Amount Developed technology 7 $ 25,584 $ 13,890 $ 11,694 Maintenance relationships 8 3,485 2,488 997 Customer relationships 6 11,802 6,884 4,918 Acquired technology 2 1,925 180 1,745 Total $ 42,796 $ 23,442 $ 19,354 *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, 2018 . Intangible asset amortization expense for the years ended December 31, 2019 , 2018 and 2017 was $6.8 million , $7.6 million and $5.2 million , respectively. As of December 31, 2019 , 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 2020 $ 6,272 2021 3,372 2022 2,179 2023 1,545 2024 970 2025 and thereafter 267 Total amortization expense $ 14,605

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2019
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. The Company does not enter into investments for trading or speculative purposes. At December 31, 2019 and 2018 , the Company had approximately $273.1 million and $268.6 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 fair value of the Company's Notes is classified in the level 2 hierarchy. See Note 16 for further detail regarding the Notes. As of December 31, 2019 and 2018 , the Company had $2.3 million and $2.0 million , respectively, of equity securities in privately held companies. These investments are accounted for at cost, less impairment and adjusted for subsequent observable price changes obtained from orderly transactions for identical or similar investments issued by the same investee. The Company estimates the fair value of its equity investments by considering available information such as pricing in recent rounds of financing 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, 2019 and 2018

Deferred Revenue and Performanc

Deferred Revenue and Performance Obligation (Notes)	12 Months Ended
	Dec. 31, 2019
Deferred Revenue and Performance Obligation [Abstract]
Deferred revenue and performance obligation [Text Block]	Deferred Revenue and Performance Obligations Deferred Revenue For the year ended December 31, 2019 and 2018 , the Company recognized approximately $96.4 million and $74.6 million , respectively, in each case of revenue that was included in the deferred revenue balances at the beginning of the respective periods and primarily related to subscription services, maintenance and support, and other services. Performance Obligations As of December 31, 2019 , the Company expects to recognize approximately $403.7 million of revenue from remaining performance obligations. The Company expects to recognize revenue on approximately $188.3 million of these performance obligations over the next 12 months, with the balance recognized thereafter.

Stockholders Equity

Stockholders Equity	12 Months Ended
	Dec. 31, 2019
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	Stockholders’ equity Equity Offering In August 2018, the Company completed a follow-on public offering of 3,800,000 shares of the Company's common stock at an offering price of $34 per share (the "Secondary Offering"). Additionally, as part of the Secondary Offering the underwriters exercised, in full, their over-allotment option to purchase an additional 570,000 shares of the Company's common stock at the offering price of $34 per share. The aggregate gross proceeds from the Secondary Offering, including the exercise of the over-allotment, were $148.6 million , and net proceeds received after underwriting fees and offering expenses were approximately $ 142.0 million . 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, 2019 and 2018 . The remaining amount available to purchase common stock under this plan was $10.0 million as of December 31, 2019 .

Earnings per Share

Earnings per Share	12 Months Ended
	Dec. 31, 2019
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, 2019 2018 2017 Numerator: Net loss $ (69,081 ) $ (64,246 ) $ (77,926 ) Denominator: Weighted average shares (basic) 40,232 34,465 31,627 Dilutive effect of stock options, restricted stock units and stock appreciation rights — — — Weighted average shares (diluted) 40,232 34,465 31,627 Basic earnings per share $ (1.72 ) $ (1.86 ) $ (2.46 ) Diluted earnings per share $ (1.72 ) $ (1.86 ) $ (2.46 ) Dilutive potential common shares consist of shares issuable upon the exercise of stock options, settlement of SARs, and the vesting of RSUs and MSUs. Potential common shares determined to be antidilutive and excluded from diluted weighted average shares outstanding were approximately 2.1 million , 2.1 million and 2.0 million for the years ended December 31, 2019 , 2018 and 2017 , respectively. Potential common shares related to the Notes determined to be antidilutive and excluded from diluted weighted average shares outstanding were 2.2 million for the year ended December 31, 2019 .

Noncash Share-based Compensatio

Noncash Share-based Compensation	12 Months Ended
	Dec. 31, 2019
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 2007 Stock Plan and the 2017 Stock Plan (collectively the "Stock Plans"). 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. 2007 Stock Plan. The Company’s 2007 Stock Plan expired in March 2017 for purposes of granting future equity awards. As of December 31, 2019 , the Company had outstanding equity awards to acquire 726,451 shares of its common stock held by the Company’s employees, directors and consultants under the 2007 Stock Plan (assuming MSU performance at 100% of the MSUs initially granted), and inclusive of zero stock options, 551,351 RSUs, 65,000 SARs and 110,100 MSUs. 2017 Stock Plan. The Company’s 2017 Stock Plan provides for the issuance of awards to employees, officers, directors and certain other individuals providing services to the Company are eligible to receive awards. The 2017 Stock Plan reserved an aggregate amount of 4,550,000 shares for issuance. The Company may provide these incentives through the grant of: (i) restricted stock awards; (ii) RSUs (time, performance and market-based); (iii) stock options; (iv) SARs; (v) phantom stock; and (vi) performance awards, such as MSUs. As of December 31, 2019 , the Company had outstanding equity awards to acquire 1,612,026 shares of its common stock held by the Company’s employees, directors and consultants under the 2017 Stock Plan (assuming MSU performance at 100% of the MSUs initially granted), and inclusive of 1,455,458 RSUs and 156,568 MSUs. As of December 31, 2019 , 2,466,273 shares remain available for grant under the 2017 Stock Plan. As of December 31, 2019 , there were no options, SARs, restricted stock awards or phantom stock issued under the 2017 Stock Plan. 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 (Loss). The following table summarizes noncash share-based compensation expense, net of amounts capitalized, for the years ended December 31, 2019 , 2018 and 2017 (in thousands). For the Year Ended December 31, 2019 2018 2017 Share-based compensation: Cost of revenue $ 2,025 $ 1,721 $ 1,971 Operating expenses: Selling and marketing 5,995 4,396 4,348 General and administrative 11,451 10,717 11,163 Research and development 5,209 4,619 5,314 Total included in operating expenses 22,655 19,732 20,825 Total share-based compensation expense $ 24,680 $ 21,453 $ 22,796 At December 31, 2019 , there was an estimated $43.1 million of total unrecognized compensation costs related to noncash share-based compensation arrangements. These costs will be recognized over a weighted average period of 2.5 years. Stock Options For the years ended December 31, 2019 and 2018 , respectively, the Company did not grant any stock options and had no stock options outstanding. The total intrinsic value of stock options exercised for the years ended December 31, 2019 , 2018 and 2017 was zero , $2.5 million and $7.2 million , respectively. RSUs (time-based) The Company has granted time-based RSUs under the Stock Plans. 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-based RSUs as of December 31, 2019 , 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, 2018 1,969 $ 21.77 Granted 816 35.38 Vested (790 ) 21.01 Forfeited (102 ) 23.98 Unvested at December 31, 2019 1,893 $ 27.83 2.02 $ 113,422 Expected to vest at December 31, 2019 1,775 $ 27.57 1.98 $ 106,340 (1) The aggregate intrinsic value was calculated based on the fair value of the Company’s common stock on December 31, 2019 of $59.92 . The weighted average grant-date fair value of the time-based RSUs granted during the years ended December 31, 2019 , 2018 and 2017 was $35.38 , $27.61 and $21.63 , respectively. RSUs (performance-based) During 2019 , under the 2017 Stock Plan, the Company granted 113,919 performance-based RSUs ("PRSUs") to certain executive employees. These PRSUs vest on January 15, 2022 and the actual number of PRSUs that will be eligible to vest is based upon achievement of certain internal performance metrics, as defined by each award's plan documents or individual award agreements. The maximum number of shares issuable upon vesting is 200% of the PRSUs initially granted. The following table summarizes the Company's unvested PRSUs as of December 31, 2019 , 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, 2018 — $ — Granted 114 33.05 Vested — — Forfeited — — Unvested at December 31, 2019 114 $ 33.05 2.04 $ 6,826 Expected to vest at December 31, 2019 228 $ 33.05 2.04 $ 13,652 (1) The aggregate intrinsic value was calculated based on the fair value of the Company’s common stock on December 31, 2019 of $59.92 . RSUs (market-based) During 2016, under the 2007 Stock Plan, 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, 2019 , and changes during the year then ended (number of shares and intrinsic value in thousands): Number of Weighted Weighted Aggregate Unvested at December 31, 2018 215 $ 9.98 Granted — — Vested (215 ) 9.98 Forfeited — — Unvested at December 31, 2019 — $ — 0 $ — Expected to vest at December 31, 2019 — $ — 0 $ — (1) The aggregate intrinsic value was calculated based on the fair value of the Company’s common stock on December 31, 2019 of $59.92 . 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 fair value of the market-based RSUs was expensed over the derived service period for each separate vesting tranche. The derived service period for the vesting tranches of the market-based RSUs ranged 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, 2019 (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, 2018 287 $ 10.92 Granted — — Exercised (222 ) 11.08 Forfeited — — Expired — — Outstanding, December 31, 2019 65 $ 10.38 0.74 $ 3,220 Exercisable at December 31, 2019 65 $ 10.38 0.74 $ 3,220 Vested and expected to vest at December 31, 2019 65 $ 10.38 0.74 $ 3,220 (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, 2019 of $59.92 and the exercise price of the underlying SARs. The Company did not grant SARs in 2019 , 2018 and 2017 . MSUs I n 2018 and 2017 , the Company granted MSUs to certain executive employees under the Stock Plans. 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 3 -year Performance Period. The MSUs vested on March 1, 2019 and will vest on March 1, 2020, October 9, 2020 and January 10, 2021, respectively. The MSUs maximum number of shares issuable upon vesting is 200% of the MSUs initially granted. The company did not grant any MSUs in 2019 . The following table summarizes the Company's MSUs activity for the year ended December 31, 2019 (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, 2018 419 $ 25.90 Granted — — Vested (152 ) 14.29 Forfeited — — Expired — — Unvested at December 31, 2019 267 $ 32.54 0.64 $ 15,979 (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, 2019 of $59.92 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 the 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, 2018 and 2017 are as follows: For the Year Ended December 31, 2018 2017 Volatility 43.67% 45.38% Risk-free interest rate 2.12% 1.56% Expected option life in years 2.97 3.07 Dividend yield — — The assumptions related to fiscal year 2017 are presented on a weighted average basis for the various awards granted throughout the period. Employee Stock Purchase Plan The Company's Employee Stock Purchase Plan ("ESPP") 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 15% 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 15% 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. During the year ended December 31, 2019 , the Company issued 75,304 shares under the ESPP. As of December 31, 2019 , 140,251 shares remain authorized and available for issuance under the ESPP. As of December 31, 2019 , the Company held approximately $1.4 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, 2019
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes The income tax provision consisted of the following for the years ended December 31, 2019 , 2018 and 2017 (in thousands): Year Ended December 31, 2019 2018 2017 Current: Federal $ — $ (252 ) $ — State and Foreign 624 663 669 624 411 669 Deferred: Federal — (211 ) (488 ) State — — (32 ) Income tax provision $ 624 $ 200 $ 149 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, 2019 , 2018 and 2017 , respectively, were as follows (in thousands): Year Ended December 31, 2019 2018 2017 Provision at the U.S. federal statutory rate $ (14,491 ) $ (13,464 ) $ (26,443 ) Increase (decrease) resulting from: State income taxes, net of federal taxes 17 46 18 Nondeductible expenses 468 414 373 Acquisition-related expense — — 245 Statutory to GAAP income adjustment (640 ) (221 ) (77 ) Noncash share-based compensation (570 ) (394 ) (3,405 ) Other (368 ) (153 ) — Incremental benefits for tax credits (990 ) (1,656 ) (1,711 ) Change in tax rate/income subject to lower tax rates 788 (1,824 ) 2,625 Change related to prior tax years 4,006 (4,800 ) (2,331 ) Change related to US tax reform — 1,835 31,359 Change in valuation allowance 12,404 20,417 (504 ) Income tax provision $ 624 $ 200 $ 149 The Company’s effective tax rate was (0.9)% , (0.3)% and (0.2)% for the years ended December 31, 2019 , 2018 and 2017 , respectively. During the year ended December 31, 2019 , the Company's effective tax rate was impacted primarily by changes in valuation allowance, foreign income taxes and other nondeductible expenses. On December 22, 2017, the Tax Cuts and Jobs Act ("TCJA") was signed into law in the U.S. and included a broad range of tax reform proposals affecting businesses, including corporate tax rates, business deductions, and international tax provisions. The Tax Cuts and Jobs Act reduced the U.S. corporate income tax rate to 21% effective January 1, 2018. The TCJA imposes a repatriation tax on any accumulated offshore earnings and profit. As of December 31, 2019 , the Company has reviewed the offshore earnings and profits and has no additional earnings to repatriate and has provided for no tax. Based on the current accumulated loss in the foreign jurisdictions, the Company has no global intangible low-taxed income (“GILTI”) to report for December 31, 2019 . The Company is under the revenue requirements to be subject to the base erosion and avoidance tax (“BEAT”), however, it has reviewed the transactions with foreign affiliates and does not believe there are payments that qualify under BEAT. The TCJA created the foreign derived intangible income (“FDII”) which allows for a deduction for certain types of foreign income. However, since the Company is in a current net operating loss position, no deduction for FDII is allowable for the current year. The tax effects of temporary differences and other tax attributes that give rise to significant portions of the deferred tax assets and liabilities as of December 31, 2019 and 2018 are as follows (in thousands): Year Ended December 31, 2019 2018 Noncurrent deferred taxes: Property and equipment $ (158 ) $ (528 ) Noncash share-based compensation 2,534 6,922 Disallowed interest expense 5,871 4,574 Capitalized software (1,905 ) (1,533 ) Amortization (2,971 ) (4,110 ) R&E tax credit carryforwards 11,594 10,603 Deferred revenue 2,264 2,680 Federal Net Operating Losses ("NOLs") 69,673 58,601 State NOLs 2,254 2,319 State Credits 2,005 2,005 Foreign NOLs 11,808 8,945 Foreign tax credit carryforward 2,168 2,462 Other 1,458 1,291 Total noncurrent deferred tax assets 106,595 94,231 Less: Valuation allowance (106,476 ) (94,231 ) Total noncurrent deferred tax asset 119 — Total net deferred tax asset $ 119 $ — The net deferred tax liability is classified as other liabilities, noncurrent in the accompanying Consolidated Balance Sheets. The Company has federal and state net operating loss carryforwards related to current and prior year operations and acquisitions. 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 tax law, the net operating loss carryforwards are not subject to ownership change limitations. The U.S. federal and foreign net operating loss and R&E tax credit carryforward amount available to be used in future periods, taking into account the Section 382 annual limitation and current year losses, is approximately $379.2 million and $13.4 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. The U.S. net operating losses generated in 2018 have no expiration. Also included in net operating losses are $47.2 million of French carryforwards which have no expiration. 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 2019 , 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, 2019 and 2018 . Undistributed earnings of the Company’s foreign subsidiaries are considered permanently reinvested and, accordingly, no provision for U.S. federal or state income taxes or non-U.S. withholding taxes has been provided thereon. The cumulative amount of positive undistributed earnings of the Company’s non-U.S. subsidiaries, if any, was minimal for the years ended December 31, 2019 and 2018 . 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, 2019 , 2018 and 2017 , the Company had approximately zero , $0.2 million and $0.2 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 to tax expense as of December 31, 2019 , 2018 and 2017 , respectively. During 2019, the Company determined that the statute of limitations concluded for positions and removed these positions from the uncertain tax positions. The Company believes the remaining position will be removed from the schedule during the next twelve months as the statute expires on that position. The Company continually monitors tax positions and will evaluate if any new positions need to be added during the next twelve months. The Company is not subject to or aware of any forth-coming income tax examinations at this time. The Company has completed a transfer pricing review by the Bulgarian tax authorities during 2019. The Company files tax returns in the U.S. and various foreign jurisdictions. The Company is subject to U.S. federal income tax examination for the calendar tax years 2018, 2017, 2016, 2015, 2014 and, 2013 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, 2019 , 2018 and 2017 (in thousands): Year Ended December 31, 2019 2018 2017 Beginning balance $ 183 $ 183 $ 192 Changes based on tax positions related to prior year — — — Changes due to settlement (169 ) — (9 ) Ending balance $ 14 $ 183 $ 183 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, 2019
Debt Instrument [Line Items]
Long-term Debt [Text Block]	Convertible Senior Notes The Company issued $143.8 million principal amount of the 2019 Notes in December 2014, $106.3 million principal amount of the 2047 Notes in June 2017, and $143.8 million principal amount of the 2024 Notes in May 2019. As disclosed below, as of December 31, 2019 there was no principal amount of either the 2019 Notes or the 2047 Notes outstanding. The interest rate for the 2024 Notes is fixed at 1% per annum and the effective interest rate related to the amortization of the liability component is 6.6% . Interest is payable semi-annually in arrears on May 15 and November 15 of each year, commencing on November 15, 2019. The 2024 Notes mature on May 15, 2024, unless redeemed or converted in accordance with their terms prior to such date. Each $1,000 of principal of the 2019 Notes were initially convertible into 29.5972 shares of the Company’s common stock, which is equivalent to an initial conversion price of approximately $33.79 per share. Each $1,000 of principal of the 2024 Notes will initially be convertible into 15.1394 shares of the Company’s common stock, which is equivalent to an initial conversion price of approximately $66.05 per share. Each $1,000 of principal amount at maturity of the 2047 Notes had an issue price of $880 and were initially convertible into 20.5624 shares of the Company’s common stock, which is equivalent to an initial conversion price of approximately $48.63 per share. The initial conversion price for each of the Notes is subject to adjustment upon the occurrence of certain specified events. The Notes are each general unsecured obligations and rank senior in right of payment to all of the Company's indebtedness that is expressly subordinated in right of payment to the Notes, rank equally in right of payment with all of the Company's existing and future liabilities that are not so subordinated, are effectively junior to any of the Company's secured indebtedness to the extent of the value of the assets securing such indebtedness and are structurally subordinated to all indebtedness and other liabilities of the Company's subsidiaries (including trade payables but excluding intercompany obligations owed to the Company or its subsidiaries). On or after February 15, 2024 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 2024 Notes regardless of the contingent conversion conditions described herein. 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 governing the 2024 Notes. Holders may convert their 2024 Notes at their option at any time prior to the close of business on the business day immediately preceding February 15, 2024 only under the following circumstances: • during the five consecutive business day period immediately following any five consecutive trading day period (the "Measurement Period") in which the trading price per 2024 Note for each day of that 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 day; • during any calendar quarter commencing after the calendar quarter ending on June 30, 2019, if the last reported sale price of the common stock for 20 or more trading days (whether or not consecutive) in 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; or • upon the occurrence of specified corporate events. If a fundamental change (as defined in the relevant indenture governing the applicable series of Notes) occurs prior to the maturity date, holders of each of the Notes may require the Company to repurchase all or a portion of their notes for cash at a repurchase price equal to 100% of the principal amount at maturity of the Notes, plus any accrued and unpaid interest to, but excluding, the repurchase date. In accordance with accounting guidance on embedded conversion features, the Company valued and bifurcated the conversion options associated with each of the Notes from the respective host debt instrument, which is referred to as debt discount, and recorded the conversion option of each of the Notes in stockholders’ equity. The equity component for each Note is not remeasured as long as such Note continues to meet the conditions for equity classification. In accounting for the transaction costs for each of the Notes issuances, the Company allocated the costs incurred to the liability and equity components in proportion to the allocation of the proceeds from issuance to the liability and equity components. Issuance costs attributable to the liability component, totaling $4.3 million for the 2019 Notes, $3.4 million for the 2024 Notes and $2.7 million for the 2047 Notes, are being amortized to expense over the expected life of each Note using the effective interest method. Issuance costs attributable to the equity component related to the conversion option, totaling $1.2 million for the 2019 Notes, $1.1 million for the 2024 Notes and $0.3 million for the 2047 Notes, were netted with the equity component in stockholders' equity. In May 2019, in accordance with the Exchange Transactions, the Company used a portion of the net proceeds of the offering of the 2024 Notes to exchange and retire approximately $122.1 million in aggregate principal of the 2019 Notes for an aggregate cash consideration of $ 76.0 million and approximately 2.2 million shares of the Company's common stock. The Company recorded a $2.3 million loss on debt extinguishment related to the Exchange Transactions. The loss on extinguishment is included in the other (expense) income, net in the Consolidated Statements of Comprehensive Income (Loss). In the fourth quarter, at maturity, the Company settled the remaining principal of the 2019 Notes in cash and distributed approximately 0.3 million shares of its common stock to the notes holders, which represented the conversion value in excess of the principal amount. In August 2019, the Company issued a notice of redemption to the holders of its outstanding 2047 Notes and during the third and fourth quarter of 2019, the Company converted the entire aggregate principal of $106.3 million of the 2047 Notes and delivered approximately 2.3 million shares of its common stock upon conversion. The Company recorded a $3.4 million loss on debt extinguishment related to the Redemption. The loss on extinguishment is included in the other (expense) income, net in the Consolidated Statements of Comprehensive Income (Loss). As of December 31, 2019 , the 2024 Notes are not yet convertible, and their remaining life is approximately 52 months. As of December 31, 2019 and December 31, 2018 , the fair value of the principal amount of the Notes was $163.2 million and $251.5 million , respectively. The estimated 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 and interest rates, which represents level 2 in the fair value hierarchy. The Notes consist of the following (in thousands): December 31, 2019 December 31, 2018 Liability component: Principal $ 143,750 $ 250,000 Less: debt discount, net of amortization (33,046 ) (24,810 ) Net carrying amount $ 110,704 $ 225,190 Equity component (1) $ 32,883 $ 37,560 (1) Recorded within additional paid-in capital in the Consolidated Balance Sheet. As of December 31, 2019 , it included $32.9 million related to the 2024 Notes, net of $1.1 million issuance cost in equity, respectively. As of December 31, 2018 , it included $28.7 million and $8.8 million related to the 2019 Notes and the 2047 Notes, respectively, net of $1.2 million and $0.3 million issuance cost in equity, respectively. The following table sets forth total interest expense recognized related to the Notes (in thousands): Year Ended December 31, 2019 2018 Coupon $ 3,691 $ 5,000 Amortization of debt issuance costs 1,157 1,419 Amortization of debt discount 9,917 10,567 Total $ 14,765 $ 16,986 Note Hedge and Warrant Transactions Concurrently with the offering of the 2019 Notes, the Company entered into separate convertible note hedge (the "Note Hedges") and warrant (the "Warrants") transactions. Taken together, the purchase of the Note Hedges and the sale of the Warrants were intended to offset any actual dilution from the conversion of the 2019 Notes and to effectively increase the overall conversion price of the 2019 Notes from $33.79 to $45.48 per share. The total cost of the Note Hedges was $29.4 million . The Company received $17.1 million in cash proceeds from the sale of the Warrants. The Warrants were not part of the 2019 Notes or Note Hedges. Both the Note Hedges and Warrants have been accounted for as part of additional paid-in capital. In May 2019, in connection with the Exchange Transactions, the Company entered into certain note hedge termination agreements (the “Note Hedge Termination Agreements”) and warrant termination agreements (the “Warrant Termination Agreements”). The Note Hedge Termination Agreements terminated certain of the Note Hedges, and the Warrant Termination Agreements terminated certain of the Warrants. The Company received cash proceeds of $64.8 million related to the Note Hedge Termination Agreements, and paid $45.2 million related to the Warrant Termination Agreements. During the fourth quarter 2019, the Company received approximately 0.3 million shares of its common stock from the exercise of the remaining Note Hedges related to the 2019 Notes. These shares were recorded as treasury stock, at cost. The remaining warrants are expected to be exercised in the third quarter of 2020 and will settle on a net share basis. Capped Call Transactions In May 2019, in connection with the offering of the 2024 Notes, the Company entered into privately negotiated capped call transactions (collectively, the "Capped Call") with certain option counterparties. The Capped Call transactions cover, subject to customary anti-dilution adjustments, the number of shares of the Company’s common stock initially underlying the 2024 Notes, at a strike price that corresponds to the initial conversion price of the 2024 Notes, also subject to adjustment, and are exercisable upon conversion of the 2024 Notes. The Capped Call transactions are intended to reduce potential dilution of the Company's common stock and/or offset any cash payments the Company will be required to make in excess of the principal amount upon any conversion of 2024 Notes, and to effectively increase the overall conversion price of the 2024 Notes from $66.05 to $101.62 per share. As the Capped Call transactions meet certain accounting criteria, they are recorded in stockholders’ equity and are not accounted for as derivatives. The cost of the Capped Call was $16.4 million and was recorded as part of additional paid-in capital.

Credit Facility

Credit Facility	12 Months Ended
	Dec. 31, 2019
Credit Facility Disclosure [Abstract]
Debt Disclosure [Text Block]	Credit Facility The Company, through its wholly owned subsidiary PROS, Inc., entered into a $50 million secured Revolver with the lenders party thereto and Wells Fargo Bank, National Association as agent for the lenders party thereto. The Revolver's current five-year term expires in July 2022, 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 liquidity falls below $50 million or upon the occurrence of an event of default. As of December 31, 2019 , the Company was in compliance with all financial covenants in the Revolver. As of both December 31, 2019 and 2018 , $0.1 million of unamortized debt issuance costs related to the Revolver is included in prepaid and other current assets and other assets, noncurrent in the Consolidated Balance Sheets. For the years ended December 31, 2019 and 2018 , the Company recorded an immaterial amount of amortization of debt issuance cost which is included in other income (expense), net in the Consolidated Statements of Comprehensive Income (Loss). As of December 31, 2019 , the Company had no outstanding borrowings under the Revolver.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Litigation The Company is involved in various legal proceedings, claims and litigation which arise in the ordinary course of the business. The Company makes a provision for a liability relating to legal matters when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. These provisions are reviewed at least quarterly and adjusted to reflect the impacts of negotiations, settlements, rulings, advice of legal counsel and other information and events pertaining to a particular matter. 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. Purchase Commitments In the ordinary course of business, the Company enters into various purchase commitments for goods and services. In March 2019, the Company entered into a noncancelable agreement with a computing infrastructure vendor that amended the existing agreement dated June 2017. The amended agreement expires in March 2022. The purchase commitment as of December 31, 2019 was $64.1 million for the remaining period under the three-year agreement. Contractual Obligations In September 2018, the Company entered into an agreement of limited partnership related to a venture fund, pursuant to which the Company committed to make a capital contribution within the next five years. As of December 31, 2019 , there was $1.9 million remaining under the commitment. 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.

Segment and Geographical Inform

Segment and Geographical Information	12 Months Ended
	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Segment Reporting Disclosure [Text Block]	Segment and Geographic Information The Company operates as one segment with a single reporting unit. Operating segments are the components of an enterprise where separate financial information is evaluated regularly by the chief operating decision-maker, who is the Company's Chief Executive Officer, in deciding how to allocate resources and assessing financial performance. The Company's chief operating decision maker allocates resources and assesses performance based upon discrete financial information at the consolidated level. 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, 2019 , 2018 and 2017 , amounted to approximately $164.4 million , $128.5 million and $105.7 million , respectively, representing 66% , 65% and 63% , respectively, of annual revenue. The following geographic information is presented for the years ended December 31, 2019 , 2018 and 2017 . The Company categorizes geographic revenues based on the location of the customer’s headquarters. Year Ended December 31, 2019 2018 2017 Revenue Percent Revenue Percent Revenue Percent The Americas: United States of America $ 85,963 34 % $ 68,482 35 % $ 63,097 37 % Other 29,129 12 % 18,378 9 % 13,645 8 % Subtotal 115,092 46 % 86,860 44 % 76,742 45 % Germany 18,526 7 % 20,171 10 % 17,421 10 % The Rest of Europe 55,388 22 % 40,776 21 % 33,852 20 % Asia Pacific 43,908 18 % 32,090 16 % 26,528 16 % The Middle East 16,170 6 % 15,092 8 % 11,437 7 % Africa 1,250 — % 2,035 1 % 2,836 2 % Total revenue $ 250,334 100 % $ 197,024 100 % $ 168,816 100 %

Concentrations of Risk

Concentrations of Risk	12 Months Ended
	Dec. 31, 2019
Risks and Uncertainties [Abstract]
Concentration Risk Disclosure [Text Block]	Concentrations of Credit Risk The Company’s financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents, marketable securities and trade accounts receivable. The Company's deposits exceed federally insured limits. For the year ended December 31, 2019 , no customer accounted for 10% or more of trade accounts receivables. For the years ended December 31, 2019 , 2018 and 2017 , no single customer accounted for 10%

Related Party Transaction

Related Party Transaction	12 Months Ended
	Dec. 31, 2019
Related Party Transactions [Abstract]
Related Party Transactions Disclosure [Text Block]	Related-Party Transactions The Company currently has employment agreements with its executive officers. In the event of termination of employment other than for cause, the employment agreements provide separation benefits, including twelve to eighteen months of salary, as well as the vesting of certain equity awards.

Employment Retirement Savings

Employment Retirement Savings	12 Months Ended
	Dec. 31, 2019
Retirement Benefits [Abstract]
Defined Benefit Plan Disclosure [Line Items]	Employee Retirement Savings Plan The Company has a 401(k) savings plan for all eligible employees in the United States. Historically, the Company’s matching contribution has been 50% of the first 6% of employee contributions, and the Company may also make discretionary contributions. Matching contributions by the Company in 2019 , 2018 and 2017 totaled approximately $2.5 million , $2.4 million and $2.0 million , respectively.

Quarterly Results

Quarterly Results	12 Months Ended
	Dec. 31, 2019
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, 2019 and 2018 . 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, 2019 September 30, 2019 June 30, 2019 March 31, 2019 Total revenue $ 66,175 $ 64,150 $ 63,878 $ 56,131 Gross profit $ 37,814 $ 37,767 $ 40,295 $ 35,341 Loss from operations $ (15,071 ) $ (12,512 ) $ (12,145 ) $ (13,610 ) Net loss attributable to PROS Holdings, Inc. $ (17,300 ) $ (17,347 ) $ (17,517 ) $ (16,917 ) Net loss attributable to common stockholders per share: Basic $ (0.41 ) $ (0.42 ) $ (0.44 ) $ (0.45 ) Diluted $ (0.41 ) $ (0.42 ) $ (0.44 ) $ (0.45 ) Quarter Ended December 31, September 30, June 30, March 31, Total revenue $ 52,613 $ 49,075 $ 47,426 $ 47,910 Gross profit $ 33,155 $ 29,599 $ 28,702 $ 28,389 Loss from operations $ (9,609 ) $ (11,866 ) $ (12,993 ) $ (14,747 ) Net loss attributable to PROS Holdings, Inc. $ (12,760 ) $ (15,786 ) $ (16,844 ) $ (18,856 ) Net loss attributable to common stockholders per share: Basic $ (0.34 ) $ (0.44 ) $ (0.52 ) $ (0.58 ) Diluted $ (0.34 ) $ (0.44 ) $ (0.52 ) $ (0.58 )

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
SEC Schedule, 12-09, 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 2019 $ 978 $ — $ (760 ) $ (4 ) $ 214 2018 $ 760 $ 223 $ — $ (5 ) $ 978 2017 $ 760 $ — $ — $ — $ 760 Valuation allowance 2019 $ 94,231 $ 12,404 $ — $ (159 ) $ 106,476 2018 $ 74,153 $ 20,417 $ — $ (339 ) $ 94,231 2017 $ 69,049 $ 5,872 $ — $ (768 ) $ 74,153 (1) Deductions column represents the reversal of additions previously charged to costs and expenses and uncollectible accounts written off, net of recoveries.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	Principles of Consolidation and Basis of Presentation These 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 have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP").
Accounting Changes [Text Block]	Changes in Accounting Policies The Company has consistently applied the accounting policies described in this Note 2 to all periods presented in these Consolidated Financial Statements, except for the Company's adoption of certain accounting standards described in more detail under " Recently adopted accounting pronouncements " in this Note 2 below.
Dollar amounts	Dollar Amounts The dollar amounts presented in the tabular data within these footnote disclosures are stated in thousands of dollars, except per share amounts, or as noted within the context of each footnote disclosure.
Use of estimates	Use of Estimates The preparation of these Consolidated Financial Statements in conformity with GAAP requires the Company to make certain estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenues, costs and expenses during the reporting period. The complexity and judgment required in the Company's estimation process, as well as issues related to the assumptions, risks and uncertainties inherent in determining the nature and timing of satisfaction of performance obligations and determining the standalone selling price of performance obligations, affect the amounts of revenue, expenses, unbilled receivables and deferred revenue. Estimates are also used for, but not limited to, receivables, allowance for doubtful accounts, the determination of the period of benefit for deferred commissions, operating lease right-of-use assets and operating lease liabilities, useful lives of assets, depreciation and amortization, 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. Numerous internal and external factors can affect estimates. Actual results could differ from those estimates and such differences could be material to the Company's consolidated financial position and results of operations.
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, if any. The Company has a cash management program that provides for the investment of excess cash balances, primarily in short-term money market instruments.
Trade and Other Accounts Receivable, Unbilled Receivables, Policy [Policy Text Block]	Trade and Other Receivables Trade and other receivables are primarily comprised of trade receivables, net of allowance for doubtful accounts, contract assets and unbilled receivables. The Company records trade accounts receivable for its unconditional rights to consideration arising from the Company's performance under contracts with customers. The Company's standard billing terms are that payment is due upon receipt of invoice, payable generally within thirty to sixty days. The carrying value of such receivables, net of the allowance for doubtful accounts, represents their estimated net realizable value. The Company estimates its allowance for doubtful accounts for specific trade receivable balances based on historical collection trends, the age of outstanding trade receivables, existing economic conditions, and any financial security associated with the receivables. Contract assets represent conditional rights to consideration that have been recognized as revenue in advance of billing the customer. Unbilled receivables represent unconditional rights to consideration arising from contingent revenue that have been recognized as revenue in advance of billing the customer.
Prepaid Expenses and Other Assets [Policy Text Block]	Prepaid Expenses and Other Assets Prepaid expenses and other assets consist primarily of prepaid third-party software subscription and license fees, deferred project costs and prepaid income taxes.
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 (Loss) 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 and coding. 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.
Lessee, Leases [Policy Text Block]	Leases The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use ("ROU") assets, current operating lease liabilities and noncurrent operating lease liabilities in the Company's Consolidated Balance Sheet. ROU assets represent the Company’s right to use an underlying asset over the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. ROU assets and lease liabilities are recognized at the lease commencement date based on the estimated present value of lease payments over the lease term. The Company includes any anticipated lease incentives in the determination of lease liability. The Company uses its estimated incremental borrowing rate, which is derived from information available at the lease commencement date, in determining the present value of lease payments. The Company gives consideration to its recent debt issuances as well as publicly available data for instruments with similar characteristics when determining its incremental borrowing rates. The Company’s lease terms will include options to extend the lease when it is reasonably certain that the Company will exercise that option. Leases with a term of 12 months or less are not recorded on the Company's unaudited condensed consolidated balance sheet. The Company’s lease agreements do not contain any residual value guarantees.
Revenue Recognition, Customer Acquisitions [Policy Text Block]	Deferred Costs Sales commissions earned by the Company's sales representatives are considered incremental and recoverable costs of obtaining a customer contract. Sales commissions are deferred and amortized on a straight-line basis over the period of benefit, which the Company has determined to be five to eight years. The Company determined the period of benefit by taking into consideration its customer contracts, expected renewals of those customer contracts (as the Company currently does not pay an incremental sales commission), the Company's technology and other factors. The Company also defers amounts earned by employees other than sales representatives who earn incentive payments under compensation plans that are also tied to the value of customer contracts acquired.
Deferred Charges, Policy [Policy Text Block]	Deferred Implementation Costs The Company capitalizes certain contract fulfillment costs, including employee-related and other costs (such as hosting, employee salaries, benefits and payroll taxes), that are associated with arrangements where professional services are not distinct from other undelivered obligations in its customer contracts. The Company analyzes implementation costs and capitalizes those costs that are directly related to customer contracts that are expected to be recoverable and enhance the resources which will be used to satisfy the undelivered performance obligations in those contracts. Deferred implementation costs are amortized ratably over the remaining contract term once the revenue recognition criteria for the respective performance obligation has been met and revenue recognition commences. Deferred implementation costs are included in prepaid and other current assets and other assets, noncurrent in the Consolidated Balance Sheets. Amortization of deferred implementation costs is included in cost of subscription and cost of services revenues in the Consolidated Statements of Comprehensive Income (Loss).
Revenue Recognition, Deferred Revenue [Policy Text Block]	Deferred Revenue Deferred revenue primarily consists of customer invoicing in advance of revenues being recognized. The Company generally invoices its customers annually in advance for subscription services and maintenance and support services. Deferred revenue that is anticipated to be recognized during the next twelve-month period is recorded as current deferred revenue and the remaining portion is recorded as noncurrent deferred revenue.
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 did not identify any impairment indicators and recorded no impairment charges in the year ended December 31, 2019 , 2018 and 2017 .
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 the intangible 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 the intangible 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 sole reporting unit has been reduced below its carrying value. When conducting the annual goodwill impairment assessment, a two-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 sole 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 the Company to compare the fair value of its reporting unit with its carrying value. If the carrying amount exceeds the fair value, an impairment charge will be recognized, however, loss cannot exceed the total amount of goodwill allocated to the reporting unit. Based on the results of the qualitative review of goodwill performed as of November 30, 2019, the Company did not identify any indicators of impairment. As such, the quantitative assessment described above was not necessary.
Equity Investments, Policy [Policy Text Block]	Equity Investments 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 at cost, less impairment and adjusted for subsequent observable price changes obtained from orderly transactions for identical or similar investments issued by the same investee. Adjustments resulting from impairment, fair value, or observable price changes are accounted for in the Consolidated Statements of Comprehensive Income (Loss).
Fair Value of Financial Instruments, Policy [Policy Text Block]	Financial Instruments The carrying amount of the Company’s financial instruments, which include cash equivalents, receivables and accounts payable, and equity investments approximates their fair values at December 31, 2019 and 2018 . For additional information on the Company’s fair value measurements, see Note 10 to the Consolidated Financial Statements.
Debt, Policy [Policy Text Block]	Convertible Senior Notes In accounting for the issuance of the Notes, the Company separates each of the Notes into liability and equity components. The carrying amounts of the liability components are calculated by measuring the fair value of similar liabilities that do not have associated convertible features. The carrying amount of the equity components representing the conversion option are determined by deducting the fair value of the liability components from the par value of the respective Notes. These differences represent debt discounts that are amortized to interest expense over the respective terms of the Notes using the effective interest rate method. The equity components are not remeasured as long as they continue to meet the conditions for equity classification. In accounting for the issuance costs related to the Notes, the Company allocates the total amount of issuance costs incurred to the liability and equity components based on their relative values. Issuance costs attributable to the liability components are being amortized on a straight-line basis, which approximates the effective interest rate method, to interest expense over the respective terms of the Notes. The issuance costs attributable to the equity components are netted against the respective equity components in additional paid-in capital.
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 12 to the Consolidated Financial Statements. There were no treasury stock repurchases under the program for the years ended December 31, 2019 , 2018 and 2017 .
Revenue recognition	Revenue Recognition The Company derives its revenues primarily from subscription services, professional services, perpetual licensing of its software products and associated software maintenance and support services. The Company determines revenue recognition through the following steps: • Identification of the contract, or contracts, with a customer; • Identification of the performance obligations in the customer contract(s); • Determination of the transaction price; • Allocation of the transaction price to each performance obligation in the customer contract(s); and • Recognition of revenue when, or as, the Company satisfies a performance obligation. Subscription services revenue Subscription services primarily include customer access to one or more of the Company's cloud applications and associated customer support. Subscription services revenue is generally recognized ratably over the contractual subscription term, beginning on the date that the Company's subscription service is made available to the customer. The Company's subscription contracts do not provide customers with the right to take possession of the software supporting the service and, as a result, are accounted for as service contracts. The Company's subscription contracts are generally two to five years in length, billed annually in advance, and non-cancelable. Maintenance and support revenue Maintenance and support revenue includes post-implementation customer support for on-premises licenses and the right to unspecified software updates and enhancements. The Company recognizes revenue from maintenance and support arrangements ratably over the period in which the services are provided. The Company's maintenance and support contracts are generally one to three years in length, billed annually in advance, and non-cancelable. License revenue Licenses to on-premises software provide the customer with a right to use, in the customer's environment, the Company's software as it exists when made available to the customer. License revenue from customer contracts with distinct on-premises licenses is recognized at the point in time when the software is made available to the customer. For customer contracts that contain license and professional services that are not considered distinct, both the license and professional services are determined to be a single performance obligation and the revenue is recognized over time based upon the Company's efforts to satisfy the performance obligation. Professional services revenue Professional services revenue primarily consists of fees for deployment and configuration services, as well as training services. Professional services revenue is generally recognized as the services are rendered for time and material contracts, or on a proportional performance basis for fixed fee contracts. The majority of the Company's professional services contracts are on a fixed fee basis. Training revenue is recognized as the services are rendered. Significant judgment is required in determining whether professional services contained in a customer subscription services contract are capable of being distinct and are separately identifiable in the customer contract. Professional services determined to be distinct are accounted for as a separate performance obligation and revenue is recognized as the services are performed. If the professional services are not determined to be distinct, the professional services and the subscription services are accounted for as a single performance obligation and revenue is recognized over the contractual term of the subscription beginning on the date that subscription services are made available to the customer. Customer contracts with multiple performance obligations A portion of the Company's customer contracts contain multiple performance obligations. Significant judgment is required in determining whether multiple performance obligations contained in a single customer contract are capable of being distinct and are separately identifiable. An obligation determined to be distinct is accounted for as a separate performance obligation and revenue for that separate performance obligation is recognized when, or as, the Company satisfies the performance obligation. If obligations are not determined to be distinct, those obligations are accounted for as a single, combined performance obligation. The transaction price is allocated to each performance obligation on a relative standalone selling price basis. Disaggregation of revenue The Company categorizes revenue from external customers by geographic area based on the location of the customer's headquarters. For additional information regarding the Company's revenue by geography, see Note 19 to the Consolidated Financial Statements.
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 income (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 2007 Equity Incentive Plan ("2007 Stock Plan") and the 2017 Equity Incentive Plan ("2017 Stock Plan"), which authorize the discretionary granting of various types of stock awards to key employees, officers, directors and consultants. The 2007 Stock Plan expired in March 2017. The 2017 Stock Plan serves as the successor to the 2007 Stock Plan and was adopted in May 2017. 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, such as market stock units ("MSUs"). To date, the Company has granted stock options, SARs, RSUs, time, performance and market-based, and MSUs. The Company issues common stock from its pool of authorized stock upon exercise of stock options, settlement of SARs and MSUs or upon vesting of RSUs. The following table presents the number of awards outstanding for each award type as of December 31, 2019 and 2018 (in thousands): Year Ended December 31, Award type 2019 2018 Restricted stock units (time-based) 1,893 1,969 Restricted stock units (performance-based) 114 — Restricted stock units (market-based) — 215 Stock appreciation rights 65 287 Market stock units 267 419 Stock options. The Company did not grant stock options during 2019 and 2018 . The fair value of each stock option is 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 achievement of certain internal performance metrics set by the Company, 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, delivery of 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 3 -year period ending February 28, 2019, February 28, 2020, October 9, 2020 and December 31, 2020 ("Performance Period"), respectively. The MSUs vested on March 1, 2019, and will vest on March 1, 2020, October 9, 2020 and January 10, 2021, 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 the 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, 2019 , there were an estimated $43.1 million of total unrecognized compensation costs related to noncash share-based compensation arrangements. These costs will be recognized over a weighted average period of 2.5 years. For further discussion of the Company’s noncash share-based compensation plans, see Note 14 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-premises 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 15 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 giving effect to all dilutive potential common shares outstanding during the period using the treasury stock method and convertible notes using the if-converted method. Dilutive potential common shares consist of shares issuable upon the exercise of stock options, shares of unvested restricted stock units and market 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, market stock units and convertible notes 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 February 2016, the FASB issued ASU 2016-02, " Leases (Topic 842) " ("Topic 842"), which requires the lessee to recognize most leases on the balance sheet thereby resulting in the recognition of right-of-use ("ROU") assets and lease liabilities for those leases currently classified as operating leases. Lessor accounting remains largely unchanged from current guidance, however, Topic 842 provides improvements that are intended to align lessor accounting with the lessee model and with updated revenue recognition guidance. This standard took effect in the first quarter of 2019, including interim periods within that reporting period. The Company adopted Topic 842 as of January 1, 2019 using the modified retrospective method by recognizing the cumulative effect of initially applying the new standard as an adjustment to the opening balances of operating ROU assets and lease liabilities, while prior period amounts are not adjusted and continue to be reported in accordance with the Company's historic accounting under the prior lease accounting rules in ASC 840, " Leases ". The Company elected the package of practical expedients permitted under the transition guidance within the new Topic 842 standard for all asset classes, which among other things, allowed the Company to carryforward the historical lease classification. The Company also elected the hindsight practical expedient to determine the reasonably certain lease term for existing leases. The Company made an accounting policy election to not recognize leases with an initial term of 12 months or less on the balance sheet and instead would recognize those lease payments on a straight-line basis over the lease term in the Consolidated Statement of Comprehensive Income (Loss). The adoption of the standard had a material impact on the Company’s Consolidated Balance Sheet as a result of the increase of $26.9 million in assets and liabilities from recognition of ROU assets and lease liabilities. The standard did not have a material impact on the Company's Consolidated Statement of Comprehensive Income (Loss). In August 2018, the FASB issued ASU 2018-15, "Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract" ("Subtopic 350-40") . The amendment aligns the requirements for capitalizing implementation costs in a cloud computing arrangement service contract with the requirements for capitalizing implementation costs incurred to develop or obtain an internal-use software. The standard is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2019; early adoption is permitted. The Company early adopted Subtopic 350-40 prospectively effective January 1, 2019 and there was no impact on the Company's Consolidated Financial Statements as of the adoption date. During the year ended December 31, 2019 , the Company capitalized implementation cost in result of adoption of the standard which affected the prepaid and other current assets and other assets, noncurrent line items in the Consolidated Financial Statements. In January 2017, the FASB issued ASU 2017-04, " Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment " ("Topic 350"), which eliminates step two from the goodwill impairment test. Under the amendments in this standard, an entity should recognize an impairment charge for the amount by which the carrying amount of a reporting unit exceeds its fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The standard is effective for interim and annual reporting periods beginning after December 15, 2019; earlier adoption is permitted for goodwill impairment tests performed after January 1, 2017. The Company early adopted Topic 350 effective October 1, 2019 and there was no impact on its Consolidated Financial Statements in result of the standard adoption. In May 2014, the FASB issued Accounting Standards Update ("ASU") No. 2014-09, " Revenue from Contracts with Customers (Topic 606) " ("Topic 606"). Topic 606 replaces the prior revenue recognition requirements in ASC 605, "Revenue Recognition" ("Topic 605" or "Prior Guidance") with a comprehensive revenue measurement and recognition standard, and expanded disclosure requirements. The new standard also provides guidance on the recognition of costs related to obtaining customer contracts. Topic 606 took effect in the first quarter of 2018, including interim periods within that reporting period. The Company adopted Topic 606 and applied Topic 606 to those contracts which were not complete as of January 1, 2018 using the modified retrospective method by recognizing the cumulative effect of initially applying the new standard as an adjustment to the opening balance of accumulated deficit, while prior period amounts were not adjusted and continue to be reported in accordance with the Company's historic accounting under the Prior Guidance. See Note 2 - Summary of Significant Accounting Policies to the Consolidated Financial Statements included in form 10-K for the year ended December 31, 2018, regarding the impact of Topic 606 adoption on the Consolidated Financial Statements. Recent Accounting Pronouncements In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ("Topic 326") , in order to improve financial reporting of expected credit losses on financial instruments and other commitments to extend credit. Topic 326 requires that an entity measure and recognize expected credit losses for financial assets held at amortized cost and replaces the incurred loss impairment methodology in current GAAP with a methodology that requires consideration of a broader range of information to estimate credit losses. While the Company is continuing to assess the potential impacts of Topic 326, it does not expect the new standard to have a material effect on its 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, 2019 , that are of significance or potential significance to the Company.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 and 2018 (in thousands): Year Ended December 31, Award type 2019 2018 Restricted stock units (time-based) 1,893 1,969 Restricted stock units (performance-based) 114 — Restricted stock units (market-based) — 215 Stock appreciation rights 65 287 Market stock units 267 419

Business Combination (Tables)

Business Combination (Tables)	12 Months Ended
	Dec. 31, 2019
Business Acquisition [Line Items]
Schedule of Purchase Price Allocation [Table Text Block]	The final allocation of the total purchase price for Vayant is as follows (in thousands): Cash $ 1,822 Other current assets 1,235 Noncurrent assets 86 Intangibles 18,600 Goodwill 17,052 Accounts payable and accrued liabilities (1,668 ) Deferred revenue (600 ) Deferred tax liability (526 ) Noncurrent liabilities (49 ) Net assets acquired $ 35,952
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]	The following are the identifiable intangible assets acquired (in thousands) and their respective useful lives: Useful Life Amount (years) Developed technology $ 11,600 7 Customer relationships 7,000 5 Total $ 18,600
Business Acquisition, Pro Forma Information [Table Text Block]	ro Forma Financial Information The unaudited financial information in the table below summarizes the combined results of operations of the Company and Vayant, on a pro forma basis, as though the Company had acquired Vayant on January 1, 2016. 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, except earnings per share) 2017 Total revenue $ 173,866 Net loss (81,476 ) Earnings per share - basic and diluted $ (2.58 )

Trade and Other Receivables, _2

Trade and Other Receivables, Net (Tables)	12 Months Ended
	Dec. 31, 2019
Accounts Receivable [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	Accounts receivable at December 31, 2019 and 2018 , consists of the following (in thousands): December 31, 2019 2018 Accounts receivable $ 59,606 $ 38,876 Unbilled receivables and contract assets 5,682 3,924 Total receivables 65,288 42,800 Less: Allowance for doubtful accounts (214 ) (978 ) Trade and other receivables, net $ 65,074 $ 41,822

Property and Equipment, net (Ta

Property and Equipment, net (Tables)	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment [Table Text Block]	Property and equipment, net as of December 31, 2019 and 2018 consists of the following: December 31, Estimated useful life 2019 2018 Furniture and fixtures 5-10 years $ 3,227 $ 3,208 Computers and equipment 3-5 years 15,388 19,644 Software 3-6 years 7,302 5,432 Capitalized internal-use software development costs 3 years 10,194 8,775 Leasehold improvements Shorter of lease term or useful life 5,591 5,587 Construction in progress 794 20 Property and equipment, gross 42,496 42,666 Less: Accumulated depreciation and amortization (27,702 ) (27,990 ) Property and equipment, net $ 14,794 $ 14,676

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Lease, Cost [Table Text Block]	The components of operating lease expense were as follows (in thousands): Year Ended December 31, 2019 Operating lease cost $ 10,109 Variable lease cost 1,810 Sublease income (332 ) Total lease cost $ 11,587
Supplemental Cash Flow Information Related to Leases [Table Text Block]	Supplemental information related to leases was as follows (in thousands): Year Ended December 31, 2019 Cash paid for amounts included in the measurement of lease liability: Operating cash flows from operating leases $ 5,883
Supplemental Balance Sheet Information Related to Leases [Table Text Block]	December 31, 2019 Weighted average remaining lease term: Operating leases 7.1 years Weighted average discount rate: Operating leases 7.26 %
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	As of December 31, 2019 , maturities of lease liabilities were as follows (in thousands): Year Ending December 31, Amount 2020 $ 6,965 2021 8,745 2022 8,202 2023 4,630 2024 4,680 2025 and thereafter 34,059 Total operating lease payments 67,281 Less: Imputed interest (23,510 ) Less: Anticipated lease incentive (14,207 ) Total operating lease liabilities $ 29,564
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	As of December 31, 2018, the future minimum lease commitments related to lease agreements under Topic 840 were as follows: Year Ending December 31, Amount 2019 $ 4,164 2020 1,649 2021 5,115 2022 6,181 2023 5,679 2024 and thereafter 57,365 Total minimum lease payments $ 80,153

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2019
Goodwill [Line Items]
Schedule of Goodwill [Table Text Block]	The change in the carrying amount of goodwill for the years ended December 31, 2019 and 2018 , was as follows (in thousands): Balance as of December 31, 2017 $ 38,458 Purchase accounting adjustments 252 Foreign currency translation adjustments (479 ) Balance as of December 31, 2018 38,231 Goodwill acquired 11,077 Foreign currency translation adjustments (204 ) Balance as of December 31, 2019 $ 49,104
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Intangible assets consisted of the following as of December 31, (in thousands): December 31, 2019 Weighted average useful life (years) Gross Carrying Amount Accumulated Amortization* Net Carrying Amount Developed technology 7 $ 26,839 $ 17,653 $ 9,186 Maintenance relationships 8 3,451 2,790 661 Customer relationships 6 12,439 8,478 3,961 Acquired technology 2 1,925 1,128 797 Total $ 44,654 $ 30,049 $ 14,605 *Cumulative foreign currency translation adjustments, reflecting movement in the currencies of the underlying entities, decreased total intangible assets by approximately $0.1 million as of December 31, 2019 . December 31, 2018 Weighted average useful life (years) Gross Carrying Amount Accumulated Amortization* Net Carrying Amount Developed technology 7 $ 25,584 $ 13,890 $ 11,694 Maintenance relationships 8 3,485 2,488 997 Customer relationships 6 11,802 6,884 4,918 Acquired technology 2 1,925 180 1,745 Total $ 42,796 $ 23,442 $ 19,354 *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, 2018 .
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	As of December 31, 2019 , 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 2020 $ 6,272 2021 3,372 2022 2,179 2023 1,545 2024 970 2025 and thereafter 267 Total amortization expense $ 14,605

Earnings per Share (Table)

Earnings per Share (Table)	12 Months Ended
	Dec. 31, 2019
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, 2019 2018 2017 Numerator: Net loss $ (69,081 ) $ (64,246 ) $ (77,926 ) Denominator: Weighted average shares (basic) 40,232 34,465 31,627 Dilutive effect of stock options, restricted stock units and stock appreciation rights — — — Weighted average shares (diluted) 40,232 34,465 31,627 Basic earnings per share $ (1.72 ) $ (1.86 ) $ (2.46 ) Diluted earnings per share $ (1.72 ) $ (1.86 ) $ (2.46 )

Noncash Share-based Compensat_2

Noncash Share-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2019
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 (Loss). The following table summarizes noncash share-based compensation expense, net of amounts capitalized, for the years ended December 31, 2019 , 2018 and 2017 (in thousands). For the Year Ended December 31, 2019 2018 2017 Share-based compensation: Cost of revenue $ 2,025 $ 1,721 $ 1,971 Operating expenses: Selling and marketing 5,995 4,396 4,348 General and administrative 11,451 10,717 11,163 Research and development 5,209 4,619 5,314 Total included in operating expenses 22,655 19,732 20,825 Total share-based compensation expense $ 24,680 $ 21,453 $ 22,796
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, 2019 (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, 2018 287 $ 10.92 Granted — — Exercised (222 ) 11.08 Forfeited — — Expired — — Outstanding, December 31, 2019 65 $ 10.38 0.74 $ 3,220 Exercisable at December 31, 2019 65 $ 10.38 0.74 $ 3,220 Vested and expected to vest at December 31, 2019 65 $ 10.38 0.74 $ 3,220 (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, 2019 of $59.92 and the exercise price of the underlying SARs.
Schedule of Nonvested Performance-based Units Activity [Table Text Block]	The following table summarizes the Company's MSUs activity for the year ended December 31, 2019 (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, 2018 419 $ 25.90 Granted — — Vested (152 ) 14.29 Forfeited — — Expired — — Unvested at December 31, 2019 267 $ 32.54 0.64 $ 15,979 (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, 2019 of $59.92 and the grant date fair value of the underlying MSUs.
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, 2018 and 2017 are as follows: For the Year Ended December 31, 2018 2017 Volatility 43.67% 45.38% Risk-free interest rate 2.12% 1.56% Expected option life in years 2.97 3.07 Dividend yield — — The assumptions related to fiscal year 2017 are presented on a weighted average basis for the various awards granted throughout the period.
Restricted Stock Unit - time based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]	The following table summarizes the Company's unvested time-based RSUs as of December 31, 2019 , 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, 2018 1,969 $ 21.77 Granted 816 35.38 Vested (790 ) 21.01 Forfeited (102 ) 23.98 Unvested at December 31, 2019 1,893 $ 27.83 2.02 $ 113,422 Expected to vest at December 31, 2019 1,775 $ 27.57 1.98 $ 106,340 (1) The aggregate intrinsic value was calculated based on the fair value of the Company’s common stock on December 31, 2019 of $59.92 .
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]	The following table summarizes the Company's unvested PRSUs as of December 31, 2019 , 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, 2018 — $ — Granted 114 33.05 Vested — — Forfeited — — Unvested at December 31, 2019 114 $ 33.05 2.04 $ 6,826 Expected to vest at December 31, 2019 228 $ 33.05 2.04 $ 13,652 (1) The aggregate intrinsic value was calculated based on the fair value of the Company’s common stock on December 31, 2019 of $59.92 .
Restricted stock unit - market-based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]	The following table summarizes the Company's unvested market-based RSUs as of December 31, 2019 , and changes during the year then ended (number of shares and intrinsic value in thousands): Number of Weighted Weighted Aggregate Unvested at December 31, 2018 215 $ 9.98 Granted — — Vested (215 ) 9.98 Forfeited — — Unvested at December 31, 2019 — $ — 0 $ — Expected to vest at December 31, 2019 — $ — 0 $ — (1) The aggregate intrinsic value was calculated based on the fair value of the Company’s common stock on December 31, 2019 of $59.92 .

Income Tax Disclosure (Tables)

Income Tax Disclosure (Tables)	12 Months Ended
	Dec. 31, 2019
Schedule of income tax components [Abstract]
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	The income tax provision consisted of the following for the years ended December 31, 2019 , 2018 and 2017 (in thousands): Year Ended December 31, 2019 2018 2017 Current: Federal $ — $ (252 ) $ — State and Foreign 624 663 669 624 411 669 Deferred: Federal — (211 ) (488 ) State — — (32 ) Income tax provision $ 624 $ 200 $ 149
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, 2019 , 2018 and 2017 , respectively, were as follows (in thousands): Year Ended December 31, 2019 2018 2017 Provision at the U.S. federal statutory rate $ (14,491 ) $ (13,464 ) $ (26,443 ) Increase (decrease) resulting from: State income taxes, net of federal taxes 17 46 18 Nondeductible expenses 468 414 373 Acquisition-related expense — — 245 Statutory to GAAP income adjustment (640 ) (221 ) (77 ) Noncash share-based compensation (570 ) (394 ) (3,405 ) Other (368 ) (153 ) — Incremental benefits for tax credits (990 ) (1,656 ) (1,711 ) Change in tax rate/income subject to lower tax rates 788 (1,824 ) 2,625 Change related to prior tax years 4,006 (4,800 ) (2,331 ) Change related to US tax reform — 1,835 31,359 Change in valuation allowance 12,404 20,417 (504 ) Income tax provision $ 624 $ 200 $ 149
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	The tax effects of temporary differences and other tax attributes that give rise to significant portions of the deferred tax assets and liabilities as of December 31, 2019 and 2018 are as follows (in thousands): Year Ended December 31, 2019 2018 Noncurrent deferred taxes: Property and equipment $ (158 ) $ (528 ) Noncash share-based compensation 2,534 6,922 Disallowed interest expense 5,871 4,574 Capitalized software (1,905 ) (1,533 ) Amortization (2,971 ) (4,110 ) R&E tax credit carryforwards 11,594 10,603 Deferred revenue 2,264 2,680 Federal Net Operating Losses ("NOLs") 69,673 58,601 State NOLs 2,254 2,319 State Credits 2,005 2,005 Foreign NOLs 11,808 8,945 Foreign tax credit carryforward 2,168 2,462 Other 1,458 1,291 Total noncurrent deferred tax assets 106,595 94,231 Less: Valuation allowance (106,476 ) (94,231 ) Total noncurrent deferred tax asset 119 — Total net deferred tax asset $ 119 $ —
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, 2019 , 2018 and 2017 (in thousands): Year Ended December 31, 2019 2018 2017 Beginning balance $ 183 $ 183 $ 192 Changes based on tax positions related to prior year — — — Changes due to settlement (169 ) — (9 ) Ending balance $ 14 $ 183 $ 183 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, 2019
Debt Instrument [Line Items]
Convertible Debt [Table Text Block]	The Notes consist of the following (in thousands): December 31, 2019 December 31, 2018 Liability component: Principal $ 143,750 $ 250,000 Less: debt discount, net of amortization (33,046 ) (24,810 ) Net carrying amount $ 110,704 $ 225,190 Equity component (1) $ 32,883 $ 37,560 (1) Recorded within additional paid-in capital in the Consolidated Balance Sheet. As of December 31, 2019 , it included $32.9 million related to the 2024 Notes, net of $1.1 million issuance cost in equity, respectively. As of December 31, 2018 , it included $28.7 million and $8.8 million related to the 2019 Notes and the 2047 Notes, respectively, net of $1.2 million and $0.3 million issuance cost in equity, respectively. The following table sets forth total interest expense recognized related to the Notes (in thousands): Year Ended December 31, 2019 2018 Coupon $ 3,691 $ 5,000 Amortization of debt issuance costs 1,157 1,419 Amortization of debt discount 9,917 10,567 Total $ 14,765 $ 16,986

Segment and Geographical Info_2

Segment and Geographical Information (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 , 2018 and 2017 . The Company categorizes geographic revenues based on the location of the customer’s headquarters. Year Ended December 31, 2019 2018 2017 Revenue Percent Revenue Percent Revenue Percent The Americas: United States of America $ 85,963 34 % $ 68,482 35 % $ 63,097 37 % Other 29,129 12 % 18,378 9 % 13,645 8 % Subtotal 115,092 46 % 86,860 44 % 76,742 45 % Germany 18,526 7 % 20,171 10 % 17,421 10 % The Rest of Europe 55,388 22 % 40,776 21 % 33,852 20 % Asia Pacific 43,908 18 % 32,090 16 % 26,528 16 % The Middle East 16,170 6 % 15,092 8 % 11,437 7 % Africa 1,250 — % 2,035 1 % 2,836 2 % Total revenue $ 250,334 100 % $ 197,024 100 % $ 168,816 100 %

Quarterly Results Quarterly Fin

Quarterly Results Quarterly Financial Information Disclosures (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 and 2018 . 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, 2019 September 30, 2019 June 30, 2019 March 31, 2019 Total revenue $ 66,175 $ 64,150 $ 63,878 $ 56,131 Gross profit $ 37,814 $ 37,767 $ 40,295 $ 35,341 Loss from operations $ (15,071 ) $ (12,512 ) $ (12,145 ) $ (13,610 ) Net loss attributable to PROS Holdings, Inc. $ (17,300 ) $ (17,347 ) $ (17,517 ) $ (16,917 ) Net loss attributable to common stockholders per share: Basic $ (0.41 ) $ (0.42 ) $ (0.44 ) $ (0.45 ) Diluted $ (0.41 ) $ (0.42 ) $ (0.44 ) $ (0.45 ) Quarter Ended December 31, September 30, June 30, March 31, Total revenue $ 52,613 $ 49,075 $ 47,426 $ 47,910 Gross profit $ 33,155 $ 29,599 $ 28,702 $ 28,389 Loss from operations $ (9,609 ) $ (11,866 ) $ (12,993 ) $ (14,747 ) Net loss attributable to PROS Holdings, Inc. $ (12,760 ) $ (15,786 ) $ (16,844 ) $ (18,856 ) Net loss attributable to common stockholders per share: Basic $ (0.34 ) $ (0.44 ) $ (0.52 ) $ (0.58 ) Diluted $ (0.34 ) $ (0.44 ) $ (0.52 ) $ (0.58 )

Summary of Significant Accoun_4

Summary of Significant Accounting Policies Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)$ / shares
Summary of Significant Accounting Policies [Line Items]
Tangible Asset Impairment Charges | $	$ 0
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 | $	$ 43,100
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	2 years 6 months
Share-based Payment Arrangement, 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 Payment Arrangement, 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 Payment Arrangement, 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

Summary of Significant Accoun_5

Summary of Significant Accounting Policies Awards Outstanding (Details) - shares	Dec. 31, 2019	Dec. 31, 2018
Stock options
Awards outstanding [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	0
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	1,893,000	1,969,000
Performance Shares [Member]
Awards outstanding [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	114,000	0
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	0	215,000
Stock Appreciation Rights (SARs) [Member]
Awards outstanding [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	65,000	287,000
MSUs
Awards outstanding [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	267,000	419,000

Summary of Significant Accoun_6

Summary of Significant Accounting Policies Impact of adoption of a new pronouncement (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 26,550		$ 0
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		$ 26,900

Business Combination (Details)

Business Combination (Details) - USD ($)	Aug. 14, 2019	Aug. 03, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs			$ 502,000	$ 95,000	$ 720,000
Goodwill, Acquired During Period			11,077,000
Goodwill			49,104,000	38,231,000	38,458,000
Travelaer Acquisition [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 10,500,000		10,510,000	0	0
Business Combination, Acquisition Related Costs			500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			2,000,000
Goodwill, Acquired During Period			11,000,000
Vayant Acquisition [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Payments to Acquire Businesses, Net of Cash Acquired		$ 34,100,000	0	0	34,130,000
Business Combination, Acquisition Related Costs				100,000	700,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		18,600,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue		600,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual					3,300,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual					$ (1,800,000)
Goodwill		17,052,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount			$ 0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent		$ 526,000		800,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments Related to Previous Period				$ (300,000)
Developed Technology Rights [Member] | Travelaer Acquisition [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			7 years
Developed Technology Rights [Member] | Vayant Acquisition [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		7 years
Customer Relationships [Member] | Travelaer Acquisition [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			5 years
Customer Relationships [Member] | Vayant Acquisition [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		5 years

Business Combination Assets Acq

Business Combination Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Aug. 03, 2017
Business Acquisition [Line Items]
Goodwill	$ 49,104	$ 38,231	$ 38,458
Vayant Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents				$ 1,822
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other				1,235
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets				86
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill				18,600
Goodwill				17,052
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other				(1,668)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue				(600)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent		$ (800)		(526)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other				(49)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net				$ 35,952

Business Combination Schedule o

Business Combination Schedule of Intangible Assets Acquired (Details) - USD ($) $ in Thousands	Aug. 03, 2017	Dec. 31, 2019	Dec. 31, 2018
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life		6 years	6 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
Vayant Acquisition [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets	$ 18,600
Vayant Acquisition [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 7,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
Vayant Acquisition [Member] | Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 11,600
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	7 years

Business Combination Pro Forma

Business Combination Pro Forma (Details) - Vayant Acquisition [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)$ / shares
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue	$ 173,866
Business Acquisition, Pro Forma Net Income (Loss)	$ (81,476)
Business Acquisition, Pro Forma Earnings Per Share, Basic | $ / shares	$ (2.58)

Trade and Other Receivables, _3

Trade and Other Receivables, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, before Allowance for Credit Loss	$ 59,606	$ 38,876
Unbilled Receivables, Current	5,682	3,924
Accounts Receivable, after Allowance for Credit Loss, Current	65,288	42,800
Accounts Receivable, Allowance for Credit Loss	(214)	(978)
Account and Unbilled Receivables, Net	65,074	41,822
Bad debt expense	$ (600)	$ 200	$ 0

Deferred Costs (Details)

Deferred Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Deferred Costs [Abstract]
Deferred Costs	$ 21.2	$ 17.5
Amortization of Deferred Charges	$ 4.8	$ 3

Deferred Implementation costs_2

Deferred Implementation costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Deferred Implementation Costs [Abstract]
Capitalized Contract Cost, Net	$ 4.4	$ 3.9
Capitalized Contract Cost, Amortization	$ 1.4	$ 0.6

Property and Equipment, net (De

Property and Equipment, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 42,496	$ 42,666
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(27,702)	(27,990)
Property, Plant and Equipment, Net	14,794	14,676
Depreciation	7,100	5,500	$ 5,400
Disposal of Property Plant and Equipment	7,400	500	1,800
Loss on Disposition of Assets	0	37	59
Full Depreciated Assets in Use	12,200	14,000
Internal-use software development costs capitalized	1,436	4,613	$ 2,797
Internal Use Software Developed, Subject To Amortization	9,600	2,800
Capitalized Computer Software, Amortization	4,100	1,100
Tangible Asset Impairment Charges	0
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 3,227	3,208
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	$ 15,388	19,644
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	$ 7,302	5,432
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	$ 10,194	8,775
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	$ 5,591	5,587
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	794	20
Cloud-based product offerings [Member]
Property, Plant and Equipment [Line Items]
Internal-use software development costs capitalized	$ 1,400	$ 4,700

Leases (Details)

Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset	$ 26,550	$ 0
Lease, Cost	11,587
Operating Leases, Rent Expense, Net		$ 4,300	$ 3,900
Operating Lease, Cost	10,109
Variable Lease, Cost	1,810
Sublease Income	(332)
Operating Lease, Payments	$ 5,883
Operating Lease, Weighted Average Remaining Lease Term	7 years 1 month 6 days
Operating Lease, Weighted Average Discount Rate, Percent	7.26%
Unrecorded Unconditional Purchase Obligation	$ 1,500
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	5 years
Lessee, Operating Lease, Term of Contract	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	14 years
Lessee, Operating Lease, Term of Contract	14 years
Lease Modification [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset	$ 5,700

Leases Schedule of lease liabil

Leases Schedule of lease liability maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Lessee, Operating Lease, Liability, Payment Due [Abstract]
2020	$ 6,965
2021	8,745
2022	8,202
2023	4,630
2024	4,680
2025 and thereafter	34,059
Lessee, Operating Lease, Liability, Payments, Due	67,281
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(23,510)
Lessee, Operating Lease, Anticipated Incentives	(14,207)
Operating Lease, Liability	$ 29,564
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months		$ 4,164
Operating Leases, Future Minimum Payments, Due in Two Years		1,649
Operating Leases, Future Minimum Payments, Due in Three Years		5,115
Operating Leases, Future Minimum Payments, Due in Four Years		6,181
Operating Leases, Future Minimum Payments, Due in Five Years		5,679
Operating Leases, Future Minimum Payments, Due Thereafter		57,365
Operating Leases, Future Minimum Payments Due		$ 80,153

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Amortization of Intangible Assets	$ 6,800	$ 7,600	$ 5,200
Goodwill [Roll Forward]
Goodwill	38,231	38,458
Goodwill, Acquired During Period	11,077
Goodwill, Purchase Accounting Adjustments		252
Goodwill, Translation Adjustments	(204)	(479)
Goodwill	$ 49,104	$ 38,231	$ 38,458

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Translation Adjustments	$ 100	$ 200
Finite-Lived Intangible Assets, Gross	44,654	42,796
Finite-Lived Intangible Assets, Accumulated Amortization	30,049	23,442
Finite-Lived Intangible Assets, Net	$ 14,605	$ 19,354
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	$ 26,839	$ 25,584
Finite-Lived Intangible Assets, Accumulated Amortization	17,653	13,890
Finite-Lived Intangible Assets, Net	$ 9,186	$ 11,694
Maintenance relationship [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	8 years	8 years
Finite-Lived Intangible Assets, Gross	$ 3,451	$ 3,485
Finite-Lived Intangible Assets, Accumulated Amortization	2,790	2,488
Finite-Lived Intangible Assets, Net	$ 661	$ 997
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	6 years	6 years
Finite-Lived Intangible Assets, Gross	$ 12,439	$ 11,802
Finite-Lived Intangible Assets, Accumulated Amortization	8,478	6,884
Finite-Lived Intangible Assets, Net	$ 3,961	$ 4,918
Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years	2 years
Finite-Lived Intangible Assets, Gross	$ 1,925	$ 1,925
Finite-Lived Intangible Assets, Accumulated Amortization	1,128	180
Finite-Lived Intangible Assets, Net	$ 797	$ 1,745

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets Future Amortization (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 6,272
Finite-Lived Intangible Assets, Amortization Expense, Year Two	3,372
Finite-Lived Intangible Assets, Amortization Expense, Year Three	2,179
Finite-Lived Intangible Assets, Amortization Expense, Year Four	1,545
Finite-Lived Intangible Assets, Amortization Expense, Year Five	970
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	267
Finite-Lived Intangible Assets, Net	$ 14,605	$ 19,354

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Treasury money market funds, at fair value	$ 273.1	$ 268.6
Cost Method Investments, Fair Value Disclosure	$ 2.3	$ 2

Deferred Revenue and Performa_2

Deferred Revenue and Performance Obligation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Deferred Revenue and Performance Obligation [Abstract]
Deferred Revenue, Revenue Recognized	$ 96.4	$ 74.6
Revenue, Remaining Performance Obligation, Amount	403.7
Revenue Remaining Performance Obligation, to be recognized within 12 months	$ 188.3

Stockholders Equity (Details)

Stockholders Equity (Details) $ in Millions	Dec. 31, 2019USD ($)
Stockholders' Equity Attributable to Parent [Abstract]
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 10
Stock Repurchase Program, Authorized Amount	$ 15

Stockholders Equity Secondary O

Stockholders Equity Secondary Offering (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Secondary Offering [Abstract]
Shares, Issued		3,800,000
Shares Issued, Price Per Share		$ 34
Sale of Stock, Number of Shares Issued in Transaction		570,000
Proceeds from Issuance of Common Stock, Gross		$ 148,600
Proceeds from Issuance of Common Stock	$ 0	$ 141,954	$ 0

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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator
Net income	$ (17,300)	$ (17,347)	$ (17,517)	$ (16,917)	$ (12,760)	$ (15,786)	$ (16,844)	$ (18,856)	$ (69,081)	$ (64,246)	$ (77,926)
Denominator
Weighted average shares (basic)									40,232	34,465	31,627
Dilutive effect of potential common shares									0	0	0
Weighted Average Number of Shares Outstanding, Basic and Diluted									40,232	34,465	31,627
Weighted Average Number of Shares Outstanding, Diluted									40,232	34,465	31,627
Basic earnings per share	$ (0.41)	$ (0.42)	$ (0.44)	$ (0.45)	$ (0.34)	$ (0.44)	$ (0.52)	$ (0.58)	$ (1.72)	$ (1.86)	$ (2.46)
Diluted earnings per share	$ (0.41)	$ (0.42)	$ (0.44)	$ (0.45)	$ (0.34)	$ (0.44)	$ (0.52)	$ (0.58)	(1.72)	$ (1.86)	$ (2.46)
Notes due 2019 [Member]
Denominator
Debt Instrument, Convertible, Stock Price Trigger									33.79
Notes due 2047 [Member]
Denominator
Debt Instrument, Convertible, Stock Price Trigger									$ 48.63
Share-based Payment Arrangement [Member]
Denominator
Antidilutive potential common shares excluded from computation of earnings per share									2,100	2,100	2,000
Convertible Debt Securities [Member]
Denominator
Antidilutive potential common shares excluded from computation of earnings per share									2,200

Noncash Share-based Compensat_3

Noncash Share-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based compensation expense	$ 24,680	$ 21,453	$ 22,796
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 43,100
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	2 years 6 months
Cost of revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based compensation expense	$ 2,025	1,721	1,971
Selling and Marketing Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based compensation expense	5,995	4,396	4,348
General and Administrative Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based compensation expense	11,451	10,717	11,163
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based compensation expense	5,209	4,619	5,314
Stock compensation in operating expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based compensation expense	$ 22,655	$ 19,732	$ 20,825

Noncash Share-based Compensat_4

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, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Performance Shares [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		114,000	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		113,919
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		114,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	[1]	$ 6,826
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		228,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 33.05
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		33.05	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price		$ 33.05
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term		2 years 14 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	[1]	$ 13,652
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms		2 years 14 days
Restricted Stock Unit - time 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		1,893,000	1,969,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		816,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		1,893,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	[1]	$ 113,422
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		(790,000)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period		(102,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number		1,775,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 35.38	$ 27.61	$ 21.63
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value		21.01
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value		23.98
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value		27.83	$ 21.77
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price		$ 27.57
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term		1 year 11 months 23 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	[1]	$ 106,340
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms		2 years 7 days
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		0
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		0 years
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number		0	215,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		0			460,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	[1]	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		(215,000)
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		0
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		9.98
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		0	$ 9.98
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price		$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term		0 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	[1]	$ 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, Options, Outstanding, Intrinsic Value	[2]	$ 3,220
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number		65,000	287,000
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		65,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price		$ 10.38
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price		$ 10.92
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price			$ 10.92
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term		22 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		(222,000)
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		65,000
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		11.08
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		$ 10.38
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price		$ 10.38
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term		22 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	[2]	$ 3,220
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value	[2]	$ 3,220
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms		22 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		267,000	419,000
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, Equity Instruments Other than Options, Nonvested, Number		267,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	[3]	$ 15,979
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		(152,000)
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, 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		14.29
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		$ 32.54	$ 25.90
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms		19 days
[1]	The aggregate intrinsic value was calculated based on the fair value of the Company’s common stock on December 31, 2019 of $59.92 .
[2]	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, 2019 of $59.92 and the exercise price of the underlying SARs.
[3]	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, 2019 of $59.92 and the grant date fair value of the underlying MSUs.

Noncash Share-based Compensat_5

Noncash Share-based Compensation Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 43,100,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 0	$ 2,500,000	$ 7,200,000
Stock Price at Year End	$ 59.92
Total shareholder return period for vesting of MSUs	3 years
Shares issuable upon vesting of MSUs, maximum	200.00%
Share-based compensation arrangement by share-based payment, Minimum Employee Subscription rate	1.00%
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate	10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date	15.00%
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	75,304
ESPP contributions by Employees	$ 1,400,000
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, Non-Option Equity Instruments, Outstanding, Number	0	215,000
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, Grants in Period	0			460,000
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, Non-Option Equity Instruments, Outstanding, Number	65,000	287,000
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, Grants in Period	0
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	267,000	419,000
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, Grants in Period	0
Restricted Stock Unit - time 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	1,893,000	1,969,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 35.38	$ 27.61	$ 21.63
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	816,000
Performance Shares [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	114,000	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 33.05
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	113,919
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 Available for Grant	140,251
2017 Amended 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	4,550,000
2007 Equity Incentive Plan [Member] | 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, Non-Option Equity Instruments, Outstanding, Number	65,000
2007 Equity Incentive Plan [Member] | 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, Options, Outstanding, Number	726,451
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	110,100
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	551,351
2017 Equity Incentive Plan [Member] [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,612,026
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	2,466,273
2017 Equity Incentive Plan [Member] [Member] | 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	156,568
2017 Equity Incentive Plan [Member] [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	1,455,458
Share-based Payment Arrangement, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards vesting upon Price Target	50.00%
Share Price Target	$ 41
Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [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 Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards vesting upon Price Target	25.00%
Share Price Target	$ 33

Noncash Share-based Compensat_6

Noncash Share-based Compensation Assumptions (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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 3 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
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		43.67%	45.38%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		2.12%	1.56%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		2 years 11 months 19 days	3 years 25 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate		0.00%	0.00%

Income Tax Disclosure Component

Income Tax Disclosure Components of Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit)	$ 0	$ (252)	$ 0
Current State and Foreign	624	663	669
Current Income Tax Expense (Benefit)	624	411	669
Deferred Federal Income Tax Expense (Benefit)	0	(211)	(488)
Deferred State and Local Income Tax Expense (Benefit)	0	0	(32)
Income Tax Expense (Benefit)	$ 624	$ 200	$ 149

Income Tax Disclosure Reconcili

Income Tax Disclosure Reconciliation of Federal Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure - Reconciliation of Federal Tax Rate [Abstract]
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	$ (14,491)	$ (13,464)	$ (26,443)
Income Tax Reconciliation, State and Local Income Taxes	17	46	18
Income Tax Reconciliation, Nondeductible Expense	468	414	373
Income Tax Reconciliation, Nondeductible Expense, Other	0	0	245
Effective income tax reconciliation, Statutory to GAAP adjustments	(640)	(221)	(77)
Income Tax Reconciliation, Nondeductible Expense, Share-based Compensation Cost	(570)	(394)	(3,405)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	(368)	(153)	0
Income Tax Reconciliation, Tax Credits	(990)	(1,656)	(1,711)
Income Tax Reconciliation, Other Adjustments	788	(1,824)	2,625
Effective Income Tax Rate Reconciliation, Change related to Prior Years	4,006	(4,800)	(2,331)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	0	1,835	31,359
Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance	12,404	20,417	(504)
Income Tax Expense (Benefit)	$ 624	$ 200	$ 149

Income Tax Disclosure Tax Effec

Income Tax Disclosure Tax Effect of Temporary Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure - Tax Effect of Temporary Differences [Abstract]
Deferred Tax Assets Property And Equipment Net	$ (158)	$ (528)
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits	2,534	6,922
Deferred Tax Asset, Disallowed Interest	5,871	4,574
Deferred Tax Liabilities, Deferred Expense, Capitalized Software	(1,905)	(1,533)
Deferred Tax Liabilities, Intangible Assets	(2,971)	(4,110)
Deferred Tax Assets, Tax Credit Carryforwards, Research	11,594	10,603
Deferred Tax Asset, Deferred Revenue	2,264	2,680
Deferred Tax Assets, Operating Loss Carryforwards	69,673	58,601
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	2,254	2,319
Tax Credit Carryforward, Deferred Tax Asset	2,005	2,005
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	11,808	8,945
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	2,168	2,462
Deferred Tax Assets, Other	1,458	1,291
Deferred Tax Assets, Net, Noncurrent	106,595	94,231
Deferred Tax Assets, Valuation Allowance, Noncurrent	(106,476)	(94,231)
Deferred Tax Assets, Net of Valuation Allowance	119	0
Deferred Tax Assets, Net	$ 119
Deferred Tax Liability, Net		$ 0

Income Tax Disclosure Unrecogni

Income Tax Disclosure Unrecognized Tax Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits	$ 14	$ 183	$ 183	$ 192
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	0	0	0
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	$ (169)	$ 0	$ (9)

Income Tax Disclosure (Details)

Income Tax Disclosure (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate, Continuing Operations	(0.90%)	(0.30%)	(0.20%)
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	$ 2,168	$ 2,462
Operating Loss Carryforwards	379,200
R&E tax credit carryforward for future use	13,400
Unrecognized Tax Benefits	14	183	$ 183	$ 192
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	0	$ 1,835	$ 31,359
Cameleon Acquistion [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 47,200

Convertible debt (Details)

Convertible debt (Details) $ / shares in Units, shares in Millions	12 Months Ended
	Dec. 31, 2019USD ($)$ / sharesshares	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Interest	$ 3,691,000	$ 5,000,000
Amortization of Financing Costs	1,157,000	1,419,000
Payment for Debt Extinguishment or Debt Prepayment Cost	97,678,000	0	$ 0
Loss on Extinguishment of Debt	5,660,000	0	0
Debt Instrument, Fair Value Disclosure	163,200,000	251,500,000
Debt Instrument, Face Amount	143,750,000	250,000,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(33,046,000)	(24,810,000)
Convertible Debt	110,704,000	225,190,000
Purchase of capped call	16,445,000	0	0
Proceeds from bond hedge termination	64,819,000	0	0
Payment for warrant termination	45,243,000	0	$ 0
Debt Instrument, Convertible, Carrying Amount of Equity Component	32,883,000	37,560,000
Amortization of Debt Discount (Premium)	9,917,000	10,567,000
Interest Expense, Debt	14,765,000	$ 16,986,000
Notes due 2019 [Member]
Debt Instrument [Line Items]
Convertible debt, issuance cost, equity component	1,200,000
Extinguishment of Debt, Amount	122,100,000
Payment for Debt Extinguishment or Debt Prepayment Cost	$ 76,000,000
Stock Issued During Period, Shares, Conversion of Convertible Securities | shares	2.2
Loss on Extinguishment of Debt	$ 2,300,000
Stock Issued During Period, Shares, Issuance at Maturity | shares	0.3
Debt Instrument, Face Amount	$ 143,800,000
Purchase of capped call	(29,400,000)
Proceeds from Issuance of Warrants	$ 17,100,000
Debt Instrument, Convertible, Conversion Ratio	29.5972
Debt Instrument, Convertible, Stock Price Trigger | $ / shares	$ 33.79
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 45.48
Debt Issuance Cost	$ 4,300,000
Debt Instrument, Convertible, Carrying Amount of Equity Component	28,700,000
Notes due 2047 [Member]
Debt Instrument [Line Items]
Convertible debt, issuance cost, equity component	300,000
Debt Conversion, Converted Instrument, Amount	$ 106,300,000
Conversion of Stock, Shares Issued | shares	2.3
Loss on Extinguishment of Debt	$ 3,400,000
Debt Instrument, Face Amount	$ 106,300,000
Debt Instrument, Convertible, Conversion Ratio	20.5624
Debt Instrument, Convertible, Stock Price Trigger | $ / shares	$ 48.63
Debt instrument, Convertible, Initial issue price per $1,000 of principal	$ 880
Debt Issuance Cost	2,700,000
Debt Instrument, Convertible, Carrying Amount of Equity Component	8,800,000
Notes due 2024 [Member]
Debt Instrument [Line Items]
Convertible debt, issuance cost, equity component	$ 1,100,000
Debt Instrument, Convertible, Remaining Discount Amortization Period	52 months
Debt Instrument, Face Amount	$ 143,800,000
Debt Instrument, Interest Rate, Stated Percentage	1.00%
Debt Instrument, Interest Rate, Effective Percentage	6.60%
Debt Instrument, Convertible, Conversion Ratio	15.1394
Debt Instrument, Convertible, Stock Price Trigger | $ / shares	$ 66.05
Debt Issuance Cost	$ 3,400,000
Debt Instrument, Convertible, Carrying Amount of Equity Component	$ 32,900,000
Debt Instrument, Convertible, Conversion Price | $ / shares	$ 101.62

Credit Facility (Details)

Credit Facility (Details) $ in Millions	Dec. 31, 2019USD ($)
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount	$ 50
Debt Instrument, Covenant, Minimum Liquidity	50
Unamortized Debt Issuance Expense	$ 0.1
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	2.25%
Maximum [Member] | Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.25%

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Millions	Dec. 31, 2019USD ($)
Long-term Purchase Commitment [Line Items]
Purchase Obligation	$ 64.1
Contractual Obligation	$ 1.9

Segment and Geographical Info_3

Segment and Geographical Information International Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
International revenue									$ 164,400	$ 128,500	$ 105,700
Total Revenue	$ 66,175	$ 64,150	$ 63,878	$ 56,131	$ 52,613	$ 49,075	$ 47,426	$ 47,910	$ 250,334	$ 197,024	$ 168,816
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									66.00%	65.00%	63.00%
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenue									$ 85,963	$ 68,482	$ 63,097
percentage of total revenue									34.00%	35.00%	37.00%
South America and Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenue									$ 29,129	$ 18,378	$ 13,645
percentage of total revenue									12.00%	9.00%	8.00%
North and South America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenue									$ 115,092	$ 86,860	$ 76,742
percentage of total revenue									46.00%	44.00%	45.00%
GERMANY
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenue									$ 18,526	$ 20,171	$ 17,421
percentage of total revenue									7.00%	10.00%	10.00%
The Rest of Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenue									$ 55,388	$ 40,776	$ 33,852
percentage of total revenue									22.00%	21.00%	20.00%
Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenue									$ 43,908	$ 32,090	$ 26,528
percentage of total revenue									18.00%	16.00%	16.00%
Middle East [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenue									$ 16,170	$ 15,092	$ 11,437
percentage of total revenue									6.00%	8.00%	7.00%
Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenue									$ 1,250	$ 2,035	$ 2,836
percentage of total revenue									0.00%	1.00%	2.00%

Concentrations of Risk (Details

Concentrations of Risk (Details)	12 Months Ended
	Dec. 31, 2019
Revenue Benchmark [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, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 2.5	$ 2.4	$ 2
Matching Percentage of Salary Contribution by Qualified Employees	50.00%
Qualified Employees Contribution Matching Percentage by the Employer	6.00%

Quarterly Results Quarterly F_2

Quarterly Results Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Total Revenue	$ 66,175	$ 64,150	$ 63,878	$ 56,131	$ 52,613	$ 49,075	$ 47,426	$ 47,910	$ 250,334	$ 197,024	$ 168,816
Gross Profit	37,814	37,767	40,295	35,341	33,155	29,599	28,702	28,389	151,217	119,845	100,250
Operating Income (Loss)	(15,071)	(12,512)	(12,145)	(13,610)	(9,609)	(11,866)	(12,993)	(14,747)	(53,338)	(49,215)	(64,943)
Net Income (Loss) Attributable to Parent	$ (17,300)	$ (17,347)	$ (17,517)	$ (16,917)	$ (12,760)	$ (15,786)	$ (16,844)	$ (18,856)	$ (69,081)	$ (64,246)	$ (77,926)
Basic earnings per share	$ (0.41)	$ (0.42)	$ (0.44)	$ (0.45)	$ (0.34)	$ (0.44)	$ (0.52)	$ (0.58)	$ (1.72)	$ (1.86)	$ (2.46)
Diluted	$ (0.41)	$ (0.42)	$ (0.44)	$ (0.45)	$ (0.34)	$ (0.44)	$ (0.52)	$ (0.58)	$ (1.72)	$ (1.86)	$ (2.46)

Schedule II - Valuation and Q_2

Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount		$ 978	$ 760	$ 760
Valuation Allowances and Reserves, Charged to Cost and Expense		0	223	0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	[1]	(760)	0	0
Valuation Allowances and Reserves, Charged to Other Accounts		(4)	(5)	0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount		214	978	760
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount		94,231	74,153	69,049
Valuation Allowances and Reserves, Charged to Cost and Expense		12,404	20,417	5,872
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction		0	0	0
Valuation Allowances and Reserves, Charged to Other Accounts	[2]	(159)	(339)	(768)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount		$ 106,476	$ 94,231	$ 74,153
[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 the cumulative translation adjustment impact on the allowance.