PROS (PRO) 10-Q 4 May 21 2021 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 27, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	001-33554
Entity Registrant Name	PROS HOLDINGS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	76-0168604
Entity Address, Address Line One	3200 Kirby Drive, Suite 600
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77098
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 Central Index Key	0001392972
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
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 Common Stock, Shares Outstanding		44,252,856
Former Address [Member]
Entity Information [Line Items]
Entity Address, Address Line One
Entity Address, City or Town
Entity Address, State or Province
Entity Address, Postal Zip Code

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 323,929	$ 329,134
Account and Unbilled Receivables, Net	53,665	49,578
Deferred Costs, Current	5,883	5,941
Prepaid and other current assets	10,668	9,647
Total current assets	394,145	394,300
Property and equipment, net	35,629	36,504
Operating Lease, Right-of-Use Asset	29,044	30,689
Deferred Costs, Noncurrent	11,735	12,544
Intangible Assets, Net (Excluding Goodwill)	7,467	8,341
Goodwill	49,563	50,044
Other long term assets, net	7,505	7,549
Total assets	535,088	539,971
Current liabilities:
Accounts payable	6,317	4,246
Accrued liabilities	16,734	13,065
Accrued payroll and other employee benefits	17,958	25,514
Operating Lease, Liability, Current	5,897	5,937
Deferred Revenue, Current	113,478	99,156
Total current liabilities	160,384	147,918
Long-term deferred revenue	8,528	11,372
Convertible Debt, Noncurrent	287,169	218,028
Operating Lease, Liability, Noncurrent	42,529	44,099
Other Liabilities, Noncurrent	1,449	1,517
Total liabilities	500,059	422,934
Commitments and contingencies (see Note 9)
Stockholders' equity:
Preferred Stock, Value, Issued	0	0
Common Stock, Value, Issued	49	48
Additional paid-in capital	518,338	589,040
Treasury Stock, Value	(29,847)	(29,847)
Retained Earnings (Accumulated Deficit)	(449,472)	(438,773)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(4,039)	(3,431)
Total stockholders' equity	35,029	117,037
Total liabilities and stockholders' equity	$ 535,088	$ 539,971
Common stock - shares authorized	75,000,000	75,000,000
Preferred stock - shares authorized	5,000,000	5,000,000
Preferred stock - par value	$ 0.001	$ 0.001
Preferred stock - shares issued	0	0
Treasury stock - shares	4,680,723	4,680,723
Common stock - par value	$ 0.001	$ 0.001

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Allowance for bad debts	$ 3,563,000	$ 4,122,000
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	48,933,488	48,142,267
Common stock - shares outstanding	44,252,765	43,461,544
Treasury stock - shares	4,680,723	4,680,723

Condensed Consolidated Statemen

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue from Contract with Customer, Including Assessed Tax	$ 61,378	$ 66,311
Cost of Goods and Services Sold	26,492	28,727
Gross Profit	34,886	37,584
Operating Expenses
Selling and Marketing Expense	21,564	24,920
General and Administrative Expense	13,454	14,880
Research and development	20,458	19,136
Income from operations	(20,590)	(21,352)
Other income (expense):
Convertible debt interest and amortization	(1,576)	(2,062)
Other Nonoperating Income (Expense)	286	831
Loss before income tax provision	(21,880)	(22,583)
Income tax provision (benefit)	149	152
Net income (loss)	$ (22,029)	$ (22,735)
Earnings Per Share, Basic	$ (0.50)	$ (0.53)
Net earnings (loss) per share:
Earnings Per Share, Basic and Diluted	(0.50)	(0.53)
Earnings Per Share, Diluted	$ (0.50)	$ (0.53)
Weighted average number of shares:
Weighted Average Number of Shares Outstanding, Basic and Diluted	44,245	43,102
Weighted Average Number of Shares Outstanding, Basic	44,245	43,102
Other comprehensive income, net of tax:
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	$ (608)	$ (170)
Other comprehensive income	(608)	(170)
Comprehensive income (loss)	(22,637)	(22,905)
Accumulated Other Comprehensive Income, net of tax [Member]
Other comprehensive income, net of tax:
Other comprehensive income	(608)	(170)
Subscription and Circulation [Member]
Revenue from Contract with Customer, Including Assessed Tax	42,648	43,170
Cost of Goods and Services Sold	13,801	12,864
Maintenance [Member]
Revenue from Contract with Customer, Including Assessed Tax	9,674	12,523
Cost of Goods and Services Sold	2,258	2,790
Subscription, maintenance and support
Revenue from Contract with Customer, Including Assessed Tax	52,322	55,693
Cost of Goods and Services Sold	16,059	15,654
Service [Member]
Revenue from Contract with Customer, Including Assessed Tax	9,056	10,618
Cost of Goods and Services Sold	$ 10,433	$ 13,073

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities:
Net income (loss)	$ (22,029,000)	$ (22,735,000)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, Depletion and Amortization	3,068,000	3,420,000
Amortization of Financing Costs and Discounts	373,000	1,712,000
Share-based compensation	8,170,000	6,347,000
Provision for doubtful accounts	(559,000)	2,596,000
Changes in operating assets and liabilities:
Accounts and unbilled receivables	(3,610,000)	8,889,000
Increase (Decrease) in Deferred Costs	867,000	763,000
Prepaid expenses and other assets	(395,000)	(701,000)
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	(173,000)	868,000
Accounts payable	2,012,000	579,000
Accrued liabilities	3,918,000	(3,840,000)
Accrued payroll and other employee benefits	(7,573,000)	(20,055,000)
Deferred revenue	11,502,000	(2,016,000)
Net cash provided by (used in) operating activities	(4,429,000)	(24,173,000)
Investing activities:
Purchases of property and equipment	(1,300,000)	(10,993,000)
Internal-use software development costs capitalized	0	(412,000)
Payments to Acquire Other Investments	(501,000)	0
Net cash provided by (used in) investing activities	(1,801,000)	(11,405,000)
Financing activities:
Proceeds from Stock Plans	1,596,000	1,364,000
Tax withholding related to net share settlement of restricted stock units	(352,000)	(20,172,000)
Net cash provided by (used in) financing activities	1,244,000	(18,808,000)
Effect of Exchange Rate on Cash and Cash Equivalents	(219,000)	91,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(5,205,000)	(54,295,000)
Cash and cash equivalents:
Beginning of period	329,134,000	306,077,000
End of period	323,929,000	251,782,000
Capital Expenditures Incurred but Not yet Paid	$ 328,000	$ 3,253,000

Condensed Consolidated Statem_3

Condensed Consolidated Statement of Stockholders' Equity Statement - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Retained Earnings [Member]Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income, net of tax [Member]
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2019			42,630,123
Stockholders' Equity Attributable to Parent- Beginning Balance at Dec. 31, 2019	$ 164,996		$ 47	$ 560,496	$ (29,847)	$ (361,789)		$ (3,911)
Treasury Stock, Shares - Beginning Balance at Dec. 31, 2019					4,680,723
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures			634,600
Stock Issued During Period, Value, Restricted Stock Award, Gross	(20,172)		$ 1	(20,173)
Stock Issued During Period, Shares, Employee Stock Purchase Plans			26,774
Proceeds from Stock Plans	$ 1,364			1,364
Warrant Exercise, Shares	0		163
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	$ 6,327			6,327
Other Comprehensive Income (Loss), Net of Tax	(170)							(170)
Net Income (Loss) Attributable to Parent	(22,735)					(22,735)
Treasury Stock, Shares - Enging Balance at Mar. 31, 2020					4,680,723
Stockholders' Equity Attributable to Parent- Ending Balance at Mar. 31, 2020	$ 129,610		$ 48	548,014	$ (29,847)	(384,524)		(4,081)
Common Stock, Shares, Outstanding, Ending Balance at Mar. 31, 2020			43,291,660
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2020	43,461,544		43,461,544
Stockholders' Equity Attributable to Parent- Beginning Balance at Dec. 31, 2020	$ 117,037		$ 48	589,040	$ (29,847)	(438,773)		(3,431)
Treasury Stock, Shares - Beginning Balance at Dec. 31, 2020	4,680,723				4,680,723
Stockholders' Equity Attributable to Parent- Ending Balance at Jan. 01, 2021		$ (68,768)					$ 11,330
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2020	43,461,544		43,461,544
Stockholders' Equity Attributable to Parent- Beginning Balance at Dec. 31, 2020	$ 117,037		$ 48	589,040	$ (29,847)	(438,773)		(3,431)
Treasury Stock, Shares - Beginning Balance at Dec. 31, 2020	4,680,723				4,680,723
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures			749,251
Stock Issued During Period, Value, Restricted Stock Award, Gross	$ (352)		$ 1	(353)
Stock Issued During Period, Shares, Employee Stock Purchase Plans	41,970		41,970
Proceeds from Stock Plans	$ 1,596			1,596
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt				(80,098)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	8,153			8,153
Other Comprehensive Income (Loss), Net of Tax	(608)							(608)
Net Income (Loss) Attributable to Parent	$ (22,029)					(22,029)
Treasury Stock, Shares - Enging Balance at Mar. 31, 2021	4,680,723				4,680,723
Stockholders' Equity Attributable to Parent- Ending Balance at Mar. 31, 2021	$ 35,029		$ 49	$ 518,338	$ (29,847)	$ (449,472)		$ (4,039)
Common Stock, Shares, Outstanding, Ending Balance at Mar. 31, 2021	44,252,765		44,252,765

Organization and Nature of Oper

Organization and Nature of Operations	3 Months Ended
	Mar. 31, 2021
Organization and Nature of Operations [Abstract]
Organization and nature of operations	Organization and Nature of Operations PROS Holdings, Inc., a Delaware corporation, through its operating subsidiaries (collectively, the "Company"), provides solutions that optimize the processes of selling and shopping in the digital economy. PROS solutions leverage artificial intelligence ("AI"), self-learning and automation to ensure that every transactional experience is fast, frictionless and personalized for every shopper, supporting 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, partner, online, mobile and emerging 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 solutions based on the industries it serves and offers services to configure its solutions to meet the specific needs of each customer.

Summary of Significant Accounti

Summary of Significant Accounting Policies (Notes)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	Summary of Significant Accounting Policies Basis of presentation The accompanying unaudited condensed consolidated financial statements of the Company have been prepared in accordance with generally accepted accounting principles in the United States ("GAAP") for interim financial reporting and applicable quarterly reporting regulations of the Securities and Exchange Commission ("SEC"). In management's opinion, the accompanying interim unaudited condensed consolidated financial statements include all adjustments necessary for a fair statement of the financial position of the Company as of March 31, 2021, the results of operations for the three months ended March 31, 2021 and 2020, cash flows for the three months ended March 31, 2021 and 2020, and stockholders' equity for the three months ended March 31, 2021 and 2020. Certain information and disclosures normally included in the notes to the annual financial statements prepared in accordance with GAAP have been omitted from these interim unaudited condensed consolidated financial statements pursuant to the rules and regulations of the SEC. Accordingly, these unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2020 ("Annual Report") filed with the SEC. The unaudited condensed consolidated balance sheet as of December 31, 2020 was derived from the Company's audited consolidated financial statements but does not include all disclosures required under GAAP. Risks and uncertainties Since its initial onset in early 2020, the coronavirus ("COVID-19") pandemic has created significant global uncertainty, and c ompliance with the various containment measures implemented by governmental authorities has impacted the Company's business, as well as the businesses of its customers, suppliers and other counterparties, and the scope and duration of the outbreak and timeframe for economic recovery is uncertain. As t here are no comparable recent events that provide guidance as to the long-term effect of the COVID-19 pandemic, the Company is unable to predict the full impact that COVID-19 will have on its results from operations, financial condition, liquidity and cash flows due to numerous uncertainties, including the duration and severity of the pandemic and containment measures . Changes in accounting policies There have been no material changes in the Company’s significant accounting policies and their application as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020, except for the Company's adoption of certain accounting standards described in more detail under " Recently adopted accounting pronouncements " in this Note 2 below. Fair value measurement The Company's financial assets that are included in cash and cash equivalents and that are measured at fair value on a recurring basis consisted of $296.3 million and $301.3 million at March 31, 2021 and December 31, 2020, respectively, and were 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 ASC 820. 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. When developing its estimate of expected credit losses on trade and other receivables, the Company considers the available information relevant to assessing the collectability of cash flows, which includes a combination of both internal and external information relating to past events, current conditions, and future forecasts as well as relevant qualitative and quantitative factors that relate to the environment in which the Company operates. 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. 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 for renewals), 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 costs were $17.6 million and $18.5 million as of March 31, 2021 and December 31, 2020, respectively. Amortization expense for the deferred costs was $1.5 million and $1.4 million for the three months ended March 31, 2021 and 2020, respectively. Amortization of deferred costs is included in selling and marketing expense in the accompanying unaudited condensed consolidated statements of comprehensive income (loss). Deferred implementation costs The Company capitalizes certain contract fulfillment costs, including personnel 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 that 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 were $2.8 million and $2.9 million as of March 31, 2021 and December 31, 2020, respectively. Amortization expense for the deferred implementation costs was $0.3 million and $0.5 million for the three months ended March 31, 2021 and 2020, respectively. Deferred implementation costs are included in prepaid and other current assets and other assets, noncurrent in the unaudited condensed consolidated balance sheets. Amortization of deferred implementation costs is included in cost of subscription and cost of services revenues in the accompanying unaudited condensed consolidated statements of comprehensive income (loss). Recently adopted accounting pronouncements In August 2020, the FASB issued ASU 2020-06, Debt - Debt with Conversion and Other Options ("Subtopic 470-20") and Derivatives and Hedging - Contracts in an Entity's Own Equity ("Subtopic 815-40") , which simplifies the accounting for certain convertible instruments, amends the guidance on derivative scope exceptions for contracts in an entity's own equity, and modifies the guidance on diluted earnings per share calculations as a result of these changes. This new standard is effective for the Company's interim and annual periods beginning January 1, 2022, and earlier adoption is permitted on January 1, 2021. The Company may elect to apply the amendments on a retrospective or modified retrospective basis. The Company early adopted the new standard effective January 1, 2021 on the modified retrospective basis. The adoption decreased additional paid-in capital by $80.1 million related to the equity conversion component of the outstanding convertible notes which was previously separated and recorded in equity, and increased convertible debt, net by $68.8 million related to the removal of the debt discounts and adjustment of debt issuance cost recorded under the previous standard. The net cumulative effect of the adjustments of $11.3 million was recorded as an increase to the opening balance of the accumulated deficit as of January 1, 2021. As a result of the adoption the non-cash interest expense was lower for the three months ended March 31, 2021 and will be lower for the remaining term of the outstanding convertible notes. The adoption had no impact on the condensed consolidated statements of cash flows. Recently issued accounting pronouncements not yet adopted With the exception of the new standard discussed above, there have been no other recent accounting pronouncements or changes in accounting pronouncements during the three months ended March 31, 2021, as compared to the recent accounting pronouncements described in the Company's Annual Report, that are of significance or potential significance to the Company.

Deferred Revenue and Performanc

Deferred Revenue and Performance Obligation (Notes)	3 Months Ended
	Mar. 31, 2021
Deferred Revenue and Performance Obligation [Abstract]
Deferred revenue and performance obligation [Text Block]	Deferred Revenue and Performance Obligations Deferred Revenue For the three months ended March 31, 2021 and 2020, the Company recognized approximately $42.3 million and $47.7 million, respectively, 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 services. Performance Obligations As of March 31, 2021, the Company expects to recognize approximately $401.3 million of revenue from remaining performance obligations. The Company expects, based on the terms of the related, underlying contractual arrangements, to recognize revenue on approximately $191.0 million of these performance obligations over the next 12 months, with the balance recognized thereafter. However, as a result of uncertain economic conditions caused by COVID-19, the amount of revenue recognized from the Company's contractual remaining performance obligations could vary and be less than what the Company expects as revenue recognized could be delayed or not occur depending on the ongoing impact of COVID-19.

Disaggregation of Revenue (Note

Disaggregation of Revenue (Notes)	3 Months Ended
	Mar. 31, 2021
Disaggregation of Revenue [Abstract]
Disaggregation of Revenue [Text Block]	Disaggregation of Revenue Revenue by Geography The geographic information in the table below is presented for the three months ended March 31, 2021 and 2020. The Company categorizes geographic revenues based on the location of the customer's headquarters. Because the Company's contracts are predominately denominated in U.S. dollars, it has limited exposure to foreign currency exchange risk as discussed under " Foreign Currency Exchange Risk " of Part I, Item 3 below. Three Months Ended March 31, 2021 2020 (in thousands) Revenue Percent Revenue Percent United States of America $ 20,876 34 % $ 21,800 33 % Europe 18,692 30 % 19,930 30 % The rest of the world 21,810 36 % 24,581 37 % Total revenue $ 61,378 100 % $ 66,311 100 %

Leases (Notes)

Leases (Notes)	3 Months Ended
	Mar. 31, 2021
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 12 years. Some of these leases include options to extend for up to 15 years, and some include options to terminate within 1 year. As of March 31, 2021, the Company did not have any finance leases. Supplemental cash flow information related to leases was as follows (in thousands): Three Months Ended March 31, 2021 2020 Cash paid for operating lease liabilities $ 2,461 $ 1,627 Right-of-use asset obtained in exchange for operating lease liability $ 97 $ 1,759 As of March 31, 2021, maturities of lease liabilities were as follows (in thousands): Year Ending December 31, Amount Remaining 2021 $ 7,223 2022 10,354 2023 11,358 2024 5,368 2025 4,249 2026 4,131 Thereafter 27,726 Total operating lease payments 70,409 Less: Imputed interest (20,598) Less: Anticipated lease incentive (1,385) Total operating lease liabilities $ 48,426

Noncash Share-based Compensatio

Noncash Share-based Compensation (Note)	3 Months Ended
	Mar. 31, 2021
Noncash Share-based Compensation [Abstract]
Noncash Share-based Compensation	Noncash Share-based Compensation The Company's 2017 Equity Incentive Plan (as amended and restated, the "2017 Stock Plan") was approved by stockholders in May 2017 and reserved an aggregate amount of 2,500,000 shares for issuance. In May 2019, the shareholders approved an amendment to the 2017 Stock Plan which increased the aggregate amount of shares for issuance to a total of 4,550,000. As of March 31, 2021, 892,056 shares remain available for issuance under the 2017 Stock Plan. The following table presents the number of shares or units outstanding for each award type as of March 31, 2021 and December 31, 2020, respectively, (in thousands): Award type March 31, 2021 December 31, 2020 Restricted stock units (time-based) 2,011 1,802 Restricted stock units (performance-based) 140 162 Stock appreciation rights — 28 Market stock units 126 111 During the three months ended March 31, 2021, the Company granted 801,402 RSUs (time-based) with a weighted average grant-date fair value of $48.05 per s hare. The Company also granted 125,541 MSUs with a weighted average grant-date fair value of $56.05 to certain executive employees during the three months ended March 31, 2021. These MSUs vest on January 31, 2024 and the actual number of MSUs that will be eligible to vest is based on the total stockholder return of the Company relative to the total stockholder return of the Index over the performance period, as defined by each award's plan documents or individual award agreements. The maximum number of shares issuable upon vesting is 200% of the MSUs initially granted. The Company did not grant any stock options, SARs or performance-based RSUs during the three months ended March 31, 2021. The assumptions used to value the MSUs granted during the three months ended March 31, 2021 were as follows: March 31, 2021 Volatility 53.29 % Risk-free interest rate 0.22 % Expected option life in years 2.97 Dividend yield — Share-based compensation expense is allocated to expense categories on the unaudited condensed consolidated statements of comprehensive income (loss). The following table summarizes share-based compensation expense included in the Company's unaudited condensed consolidated statements of comprehensive income (loss) for the three months ended March 31, 2021 and 2020: Three Months Ended March 31, 2021 2020 Share-based compensation: Cost of revenue $ 826 $ 524 Operating expenses: Selling and marketing 2,224 1,866 Research and development 1,826 1,507 General and administrative 3,294 2,450 Total included in operating expenses 7,344 5,823 Total share-based compensation expense $ 8,170 $ 6,347 At March 31, 2021, the Company had an estimated $89.6 million of total unrecognized compensation costs related to share-based compensation arrangements. These costs will be recognized over a weighted average period o f 3.0 years. 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 Dec ember 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 three months ended March 31, 2021, the Company issued 41,970 shares under the ESPP. As of March 31, 2021, 32,824 shares remain authorized and available for issuance under the ESPP. As of March 31, 2021, the Company held approximately $1.0 million on behalf of employees for future purchases under the ESPP, and this amount was recorded in accrued payroll and other employee benefits in the Company's unaudited condensed consolidated balance sheet.

Convertible debt (Notes)

Convertible debt (Notes)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Long-term Debt [Text Block]	Convertible Senior Notes The following is a summary of the Company's convertible senior notes as of March 31, 2021 (in thousands): Date of Issuance Unpaid Principal Balance Net Carrying Amount Contractual Interest Rates Current Noncurrent 1% Convertible Notes due in 2024 ("2024 Notes") May 2019 $ 143,750 $ — $ 140,985 1% 2.25% Convertible Notes due in 2027 ("2027 Notes") September 2020 $ 150,000 $ — $ 146,184 2.25% The 2027 and 2024 Notes (collectively, the "Notes") are 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). Interest related to the 2027 Notes is payable semiannually in arrears in cash on March 15 and September 15 of each year, beginning on March 15, 2021. Interest related to the 2024 Notes is payable semi-annually in arrears on May 15 and November 15 of each year, beginning on November 15, 2019. The 2027 Notes mature on September 15, 2027 and 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 2027 Notes will initially be convertible into 23.9137 shares of the Company’s common stock, which is equivalent to an initial conversion price of approximately $41.82 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. The initial conversion price for the 2027 and the 2024 Notes is subject to adjustment upon the occurrence of certain specified events. As of March 31, 2021, the 2027 and 2024 Notes are not yet convertible and their remaining term is approximately 77 months and 37 months, respectively. As of March 31, 2021 and December 31, 2020, the fair value of the principal amount of the Notes in the aggregate was $332.6 million and $363.8 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. Effective January 1, 2021, the Company early adopted ASU 2020-06, Debt - Debt with Conversion and Other Options and Derivatives and Hedging - Contracts in an Entity's Own Equity. Upon adoption of the new standard, the Company removed t he debt discount and adjusted the debt issuance cost which was previously allocated between the liability and the equity component, resulting in an increase of $68.8 million to convertible debt, net. In addition, the Company recorded a reduction to additional paid-in capital of $80.1 million related to the equity conversion component of the outstanding convertible notes which was previously separated and recorded in equity. The net cumulative impact of the adoption of the standard was recorded as an increase to accumulated deficit. The Notes consist of the following (in thousands): March 31, 2021 December 31, 2020 Liability component: Principal $ 293,750 $ 293,750 Less: debt discount and issuance cost, net of amortization (6,581) (75,722) Net carrying amount $ 287,169 $ 218,028 Equity component (1) $ — $ 80,098 (1) Recorded within additional paid-in capital in the unaudited condensed consolidated balance sheet. As of December 31, 2020, it included $47.2 million and $32.9 million related to the 2027 and 2024 Notes, respectively, which was net of $1.3 million and $1.1 million issuance cost in equity, respectively. The following table sets forth total interest expense recognized related to the Notes (in thousands): Three Months Ended March 31, 2021 2020 Coupon interest $ 1,203 $ 360 Amortization of debt issuance costs 373 156 Amortization of debt discount — 1,546 Total $ 1,576 $ 2,062 Capped Call Transactions In September 2020 and in May 2019, in connection with the offering of the 2027 and 2024 Notes, respectively, 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 Notes, at a strike price that corresponds to the initial conversion price of the Notes, also subject to adjustment, and are exercisable upon conversion of the Notes. The Capped Call transactions are intended to reduce potential dilution to the Company’s common stock and/or offset any cash payments the Company will be required to make in excess of the principal amounts upon any conversion of Notes, and to effectively increase the overall conversion price of the 2027 Notes from $41.82 to $78.90 per share, and for 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 $25.3 million and $16.4 million for the 2027 and 2024 Notes, respectively, and was recorded as part of additional paid-in capital.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Litigation In the ordinary course of business, the Company regularly becomes involved in contract and other negotiations and, in more limited circumstances, becomes involved in legal proceedings, claims and litigation. The outcomes of these matters are inherently unpredictable. The Company is not currently involved in any outstanding litigation that it believes, individually or in the aggregate, will have a material adverse effect on its business, financial condition, results of operations or cash flows. 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 March 31, 2021 was $35.8 million f or the remaining period through the expiration of the agreement.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation The accompanying unaudited condensed consolidated financial statements of the Company have been prepared in accordance with generally accepted accounting principles in the United States ("GAAP") for interim financial reporting and applicable quarterly reporting regulations of the Securities and Exchange Commission ("SEC"). In management's opinion, the accompanying interim unaudited condensed consolidated financial statements include all adjustments necessary for a fair statement of the financial position of the Company as of March 31, 2021, the results of operations for the three months ended March 31, 2021 and 2020, cash flows for the three months ended March 31, 2021 and 2020, and stockholders' equity for the three months ended March 31, 2021 and 2020. Certain information and disclosures normally included in the notes to the annual financial statements prepared in accordance with GAAP have been omitted from these interim unaudited condensed consolidated financial statements pursuant to the rules and regulations of the SEC. Accordingly, these unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2020 ("Annual Report") filed with the SEC. The unaudited condensed consolidated balance sheet as of December 31, 2020 was derived from the Company's audited consolidated financial statements but does not include all disclosures required under GAAP. Risks and uncertainties Since its initial onset in early 2020, the coronavirus ("COVID-19") pandemic has created significant global uncertainty, and c ompliance with the various containment measures implemented by governmental authorities has impacted the Company's business, as well as the businesses of its customers, suppliers and other counterparties, and the scope and duration of the outbreak and timeframe for economic recovery is uncertain. As t here are no comparable recent events that provide guidance as to the long-term effect of the COVID-19 pandemic, the Company is unable to predict the full impact that COVID-19 will have on its results from operations, financial condition, liquidity and cash flows due to numerous uncertainties, including the duration and severity of the pandemic and containment measures
Accounting Standards Update and Change in Accounting Principle	Changes in accounting policies There have been no material changes in the Company’s significant accounting policies and their application as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020, except for the Company's adoption of certain accounting standards described in more detail under " Recently adopted accounting pronouncements " in this Note 2 below.
Fair value measurement	Fair value measurement The Company's financial assets that are included in cash and cash equivalents and that are measured at fair value on a recurring basis consisted of $296.3 million and $301.3 million at March 31, 2021 and December 31, 2020, respectively, and
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. When developing its estimate of expected credit losses on trade and other receivables, the Company considers the available information relevant to assessing the collectability of cash flows, which includes a combination of both internal and external information relating to past events, current conditions, and future forecasts as well as relevant qualitative and quantitative factors that relate to the environment in which the Company operates. 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.
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 for renewals), 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 costs were $17.6 million and $18.5 million as of March 31, 2021 and December 31, 2020, respectively. Amortization expense for the deferred costs was $1.5 million and $1.4 million for the three months ended March 31, 2021 and 2020, respectively. Amortization of deferred costs is included in selling and marketing expense in the accompanying unaudited condensed consolidated statements of comprehensive income (loss).
Deferred Charges, Policy [Policy Text Block]	Deferred implementation costs The Company capitalizes certain contract fulfillment costs, including personnel 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 that 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 were $2.8 million and $2.9 million as of March 31, 2021 and December 31, 2020, respectively. Amortization expense for the deferred implementation costs was $0.3 million and $0.5 million for the three months ended March 31, 2021 and 2020, respectively. Deferred implementation costs are included in prepaid and other current assets and other assets, noncurrent in the unaudited condensed consolidated balance sheets. Amortization of deferred implementation costs is included in cost of subscription and cost of services revenues in the accompanying unaudited condensed consolidated statements of comprehensive income (loss).
New Accounting Pronouncements, Policy [Policy Text Block]	Recently adopted accounting pronouncements In August 2020, the FASB issued ASU 2020-06, Debt - Debt with Conversion and Other Options ("Subtopic 470-20") and Derivatives and Hedging - Contracts in an Entity's Own Equity ("Subtopic 815-40") , which simplifies the accounting for certain convertible instruments, amends the guidance on derivative scope exceptions for contracts in an entity's own equity, and modifies the guidance on diluted earnings per share calculations as a result of these changes. This new standard is effective for the Company's interim and annual periods beginning January 1, 2022, and earlier adoption is permitted on January 1, 2021. The Company may elect to apply the amendments on a retrospective or modified retrospective basis. The Company early adopted the new standard effective January 1, 2021 on the modified retrospective basis. The adoption decreased additional paid-in capital by $80.1 million related to the equity conversion component of the outstanding convertible notes which was previously separated and recorded in equity, and increased convertible debt, net by $68.8 million related to the removal of the debt discounts and adjustment of debt issuance cost recorded under the previous standard. The net cumulative effect of the adjustments of $11.3 million was recorded as an increase to the opening balance of the accumulated deficit as of January 1, 2021. As a result of the adoption the non-cash interest expense was lower for the three months ended March 31, 2021 and will be lower for the remaining term of the outstanding convertible notes. The adoption had no impact on the condensed consolidated statements of cash flows. Recently issued accounting pronouncements not yet adopted With the exception of the new standard discussed above, there have been no other recent accounting pronouncements or changes in accounting pronouncements during the three months ended March 31, 2021, as compared to the recent accounting pronouncements described in the Company's Annual Report, that are of significance or potential significance to the Company.

Disaggregation of Revenue (Tabl

Disaggregation of Revenue (Tables)	3 Months Ended
	Mar. 31, 2021
Disaggregation of Revenue [Abstract]
Schedule of Disaggregation Of Revenue [Table Text Block]	The geographic information in the table below is presented for the three months ended March 31, 2021 and 2020. The Company categorizes geographic revenues based on the location of the customer's headquarters. Because the Company's contracts are predominately denominated in U.S. dollars, it has limited exposure to foreign currency exchange risk as discussed under " Foreign Currency Exchange Risk " of Part I, Item 3 below. Three Months Ended March 31, 2021 2020 (in thousands) Revenue Percent Revenue Percent United States of America $ 20,876 34 % $ 21,800 33 % Europe 18,692 30 % 19,930 30 % The rest of the world 21,810 36 % 24,581 37 % Total revenue $ 61,378 100 % $ 66,311 100 %

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2021
Leases [Abstract]
Supplemental Lease Information [Table Text Block]	Supplemental cash flow information related to leases was as follows (in thousands): Three Months Ended March 31, 2021 2020 Cash paid for operating lease liabilities $ 2,461 $ 1,627 Right-of-use asset obtained in exchange for operating lease liability $ 97 $ 1,759
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	As of March 31, 2021, maturities of lease liabilities were as follows (in thousands): Year Ending December 31, Amount Remaining 2021 $ 7,223 2022 10,354 2023 11,358 2024 5,368 2025 4,249 2026 4,131 Thereafter 27,726 Total operating lease payments 70,409 Less: Imputed interest (20,598) Less: Anticipated lease incentive (1,385) Total operating lease liabilities $ 48,426

Earnings per Share (Table)

Earnings per Share (Table)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following table sets forth the computation of basic and diluted earnings per share for the three months ended March 31, 2021 and 2020: Three Months Ended March 31, (in thousands, except per share data) 2021 2020 Numerator: Net loss $ (22,029) $ (22,735) Denominator: Weighted average shares (basic) 44,245 43,102 Dilutive effect of potential common shares — — Weighted average shares (diluted) 44,245 43,102 Basic loss per share $ (0.50) $ (0.53) Diluted loss per share $ (0.50) $ (0.53)

Noncash Share-based Compensat_2

Noncash Share-based Compensation (Tables)	3 Months Ended
	Mar. 31, 2021
Noncash Share-based Compensation [Abstract]
Awards outstanding [Table Text Block]	The following table presents the number of shares or units outstanding for each award type as of March 31, 2021 and December 31, 2020, respectively, (in thousands): Award type March 31, 2021 December 31, 2020 Restricted stock units (time-based) 2,011 1,802 Restricted stock units (performance-based) 140 162 Stock appreciation rights — 28 Market stock units 126 111
Schedule of Share-based Compensation Expense	The following table summarizes share-based compensation expense included in the Company's unaudited condensed consolidated statements of comprehensive income (loss) for the three months ended March 31, 2021 and 2020: Three Months Ended March 31, 2021 2020 Share-based compensation: Cost of revenue $ 826 $ 524 Operating expenses: Selling and marketing 2,224 1,866 Research and development 1,826 1,507 General and administrative 3,294 2,450 Total included in operating expenses 7,344 5,823 Total share-based compensation expense $ 8,170 $ 6,347
Market Stock Units Valuation Assumptions	The assumptions used to value the MSUs granted during the three months ended March 31, 2021 were as follows: March 31, 2021 Volatility 53.29 % Risk-free interest rate 0.22 % Expected option life in years 2.97 Dividend yield —

Convertible debt (Tables)

Convertible debt (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Schedule of Debt [Table Text Block]	The following is a summary of the Company's convertible senior notes as of March 31, 2021 (in thousands): Date of Issuance Unpaid Principal Balance Net Carrying Amount Contractual Interest Rates Current Noncurrent 1% Convertible Notes due in 2024 ("2024 Notes") May 2019 $ 143,750 $ — $ 140,985 1% 2.25% Convertible Notes due in 2027 ("2027 Notes") September 2020 $ 150,000 $ — $ 146,184 2.25%
Convertible Debt [Table Text Block]	The Notes consist of the following (in thousands): March 31, 2021 December 31, 2020 Liability component: Principal $ 293,750 $ 293,750 Less: debt discount and issuance cost, net of amortization (6,581) (75,722) Net carrying amount $ 287,169 $ 218,028 Equity component (1) $ — $ 80,098 (1) Recorded within additional paid-in capital in the unaudited condensed consolidated balance sheet. As of December 31, 2020, it included $47.2 million and $32.9 million related to the 2027 and 2024 Notes, respectively, which was net of $1.3 million and $1.1 million issuance cost in equity, respectively. The following table sets forth total interest expense recognized related to the Notes (in thousands): Three Months Ended March 31, 2021 2020 Coupon interest $ 1,203 $ 360 Amortization of debt issuance costs 373 156 Amortization of debt discount — 1,546 Total $ 1,576 $ 2,062

Summary of Significant Accoun_3

Summary of Significant Accounting Policies Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Summary of Significant Accounting Policies [Line Items]
Treasury money market funds, at fair value	$ 296.3		$ 301.3
Deferred Costs	17.6		18.5
Amortization of Deferred Charges	1.5	$ 1.4
Capitalized Contract Cost, Net	2.8		$ 2.9
Capitalized Contract Cost, Amortization	$ 0.3	$ 0.5

Summary of Significant Accoun_4

Summary of Significant Accounting Policies Fair Value Calculation Assumptions (Details) - Market Share Units (MSUs) [Member]	3 Months Ended
	Mar. 31, 2021
Valuation Assumptions for Stock Awards [Line Items]
Volatility	53.29%
Risk-free interest rate	0.22%
Expected life, in years	2 years 11 months 19 days
Dividend yield	0.00%

Summary of Significant Accoun_5

Summary of Significant Accounting Policies New Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jan. 01, 2021	Mar. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained Earnings (Accumulated Deficit)		$ (449,472)	$ (438,773)
Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt Instrument, Unamortized Discount and Debt Issuance Cost	$ 68,800
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	80,100
Retained Earnings (Accumulated Deficit)	$ 11,300

Deferred Revenue and Performa_2

Deferred Revenue and Performance Obligation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Deferred Revenue and Performance Obligation [Abstract]
Deferred Revenue, Revenue Recognized	$ 42.3	$ 47.7
Revenue, Remaining Performance Obligation, Amount	401.3
Revenue Remaining Performance Obligation, to be recognized within 12 months	$ 191

Disaggregation of Revenue Reven

Disaggregation of Revenue Revenue by Geography (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues	$ 61,378	$ 66,311
Percentage of total revenue	100.00%	100.00%
UNITED STATES
Revenues	$ 20,876	$ 21,800
Percentage of total revenue	34.00%	33.00%
Europe [Member]
Revenues	$ 18,692	$ 19,930
Percentage of total revenue	30.00%	30.00%
The rest of the world [Member]
Revenues	$ 21,810	$ 24,581
Percentage of total revenue	36.00%	37.00%

Leases (Details)

Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Option to Renew	15 years
Lessee, Operating Lease, Termination Option	1 year
Operating Lease, Payments	$ 2,461	$ 1,627
Right-of-use Asset Obtained in Exchange for Operating Lease Liability	$ 97	$ 1,759
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	12 years

Leases Schedule of lease liabil

Leases Schedule of lease liability maturities (Details) $ in Thousands	Mar. 31, 2021USD ($)
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Remaining 2021	$ 7,223
2022	10,354
2023	11,358
2024	5,368
2025	4,249
2026	4,131
Thereafter	27,726
Operating Leases, Payments Due	70,409
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(20,598)
Lessee, Operating Lease, Anticipated Incentives	(1,385)
Operating Lease, Liability	$ 48,426

Earnings per Share (Details)

Earnings per Share (Details) - shares shares in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Payment Arrangement [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive potential common shares excluded from computation of earnings per share	1.2	1.6
Convertible Debt Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive potential common shares excluded from computation of earnings per share	5.8	2.2

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
	Mar. 31, 2021	Mar. 31, 2020
Numerator
Net income (loss)	$ (22,029)	$ (22,735)
Denominator
Weighted average shares (basic)	44,245	43,102
Dilutive effect of potential common shares	0	0
Weighted average shares (diluted)	44,245	43,102
Basic Earnings Per Share	$ (0.50)	$ (0.53)
Diluted earnings per share	$ (0.50)	$ (0.53)

Noncash Share-based Compensat_3

Noncash Share-based Compensation (Details)	3 Months Ended
	Mar. 31, 2021USD ($)$ / sharesshares
Noncash Share-based Compensation (Narrative) [Line Items]
Unrecognized compensation cost related to share-based compensation | $	$ 89,600,000
Weighted average period to recognize cost, in years	3 years
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	41,970
ESPP contributions by Employees | $	$ 1,000,000
RSUs
Noncash Share-based Compensation (Narrative) [Line Items]
Awards, other than options, granted in period	801,402
Weighted average grant date fair value, per share, of awards granted in period | $ / shares	$ 48.05
Employee Stock [Member]
Noncash Share-based Compensation (Narrative) [Line Items]
Shares available for future grants	32,824
Performance Shares [Member]
Noncash Share-based Compensation (Narrative) [Line Items]
Awards, other than options, granted in period	125,541
Weighted average grant date fair value, per share, of awards granted in period | $ / shares	$ 56.05
2017 Equity Incentive Plan [Member] [Member]
Noncash Share-based Compensation (Narrative) [Line Items]
Shares reserved for issuance under Plan	2,500,000
Shares available for future grants	892,056
2017 Amended Equity Incentive Plan [Member]
Noncash Share-based Compensation (Narrative) [Line Items]
Shares reserved for issuance under Plan	4,550,000

Noncash Share-based Compensat_4

Noncash Share-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 8,170	$ 6,347
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	826	524
Selling and Marketing Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	2,224	1,866
General and Administrative Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	3,294	2,450
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	1,826	1,507
Operating Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 7,344	$ 5,823

Noncash Share-based Compensat_5

Noncash Share-based Compensation Awards outstanding (Details) - shares shares in Thousands	Mar. 31, 2021	Dec. 31, 2020
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	2,011	1,802
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	140	162
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	0	28
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	126	111

Noncash Share-based Compensat_6

Noncash Share-based Compensation Assumptions (Details) - Market Share Units (MSUs) [Member]	3 Months Ended
	Mar. 31, 2021
Assumptions For Fair Value Calculation of Market Stock Units [Line Items]
Volatility	53.29%
Risk-free interest rate	0.22%
Expected life, in years	2 years 11 months 19 days
Dividend yield	0.00%

Convertible debt (Details)

Convertible debt (Details) $ / shares in Units, $ in Thousands	Jan. 01, 2021USD ($)	Mar. 31, 2021USD ($)$ / shares	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 293,750		$ 293,750
Convertible Debt, Noncurrent		287,169		218,028
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		6,581		75,722
Convertible Debt		287,169		218,028
Debt Instrument, Convertible, Carrying Amount of Equity Component		0		80,098
Debt Instrument, Periodic Payment, Interest		1,203	$ 360
Amortization of Financing Costs		373	156
Amortization of Debt Discount (Premium)		0	1,546
Interest Expense, Debt		1,576	$ 2,062
Debt Instrument, Fair Value Disclosure		332,600		363,800
Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount and Debt Issuance Cost	$ 68,800
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	$ 80,100
Notes due 2024 [Member]
Debt Instrument [Line Items]
Convertible debt, issuance cost, equity component		$ 1,100
Debt Instrument, Convertible, Conversion Ratio		15.1394
Debt Instrument, Convertible, Stock Price Trigger | $ / shares		$ 66.05
Debt Instrument, Convertible, Conversion Price | $ / shares		$ 101.62
Debt Instrument, Face Amount		$ 143,750
Convertible Debt, Current		0
Convertible Debt, Noncurrent		$ 140,985
Debt Instrument, Convertible, Carrying Amount of Equity Component				32,900
Debt Instrument, Convertible, Remaining Discount Amortization Period		37 months
Purchase of convertible bond hedge		$ 16,400
Debt Instrument, Interest Rate, Stated Percentage		1.00%
Notes due 2027
Debt Instrument [Line Items]
Convertible debt, issuance cost, equity component		$ 1,300
Debt Instrument, Convertible, Conversion Ratio		23.9137
Debt Instrument, Convertible, Stock Price Trigger | $ / shares		$ 41.82
Debt Instrument, Convertible, Conversion Price | $ / shares		$ 78.90
Debt Instrument, Face Amount		$ 150,000
Convertible Debt, Current		0
Convertible Debt, Noncurrent		$ 146,184
Debt Instrument, Convertible, Carrying Amount of Equity Component				$ 47,200
Debt Instrument, Convertible, Remaining Discount Amortization Period		77 months
Purchase of convertible bond hedge		$ 25,300
Debt Instrument, Interest Rate, Stated Percentage		2.25%

Commitments and Contingencies P

Commitments and Contingencies Purchase commitments (Details) $ in Millions	Mar. 31, 2021USD ($)
Long-term Purchase Commitment [Line Items]
Purchase Obligation	$ 35.8