PROS (PRO) 10-Q 3 Aug 21 2021 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Jul. 27, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 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	Q2
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		44,378,704
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	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 318,326	$ 329,134
Trade and Other Receivables, Net, Current	41,295	49,578
Deferred Costs, Current	5,879	5,941
Prepaid and other current assets	9,376	9,647
Total current assets	374,876	394,300
Property and equipment, net	34,267	36,504
Operating Lease, Right-of-Use Asset	27,632	30,689
Deferred Costs, Noncurrent	11,196	12,544
Intangible Assets, Net (Excluding Goodwill)	6,596	8,341
Goodwill	49,698	50,044
Other long term assets, net	7,238	7,549
Total assets	511,503	539,971
Current liabilities:
Accounts payable	5,265	4,246
Accrued liabilities	12,786	13,065
Accrued payroll and other employee benefits	22,543	25,514
Operating Lease, Liability, Current	6,203	5,937
Deferred Revenue, Current	101,235	99,156
Total current liabilities	148,032	147,918
Long-term deferred revenue	7,896	11,372
Convertible Debt, Noncurrent	287,542	218,028
Operating Lease, Liability, Noncurrent	40,837	44,099
Other Liabilities, Noncurrent	1,468	1,517
Total liabilities	485,775	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	526,926	589,040
Treasury Stock, Value	(29,847)	(29,847)
Retained Earnings (Accumulated Deficit)	(467,518)	(438,773)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3,882)	(3,431)
Total stockholders' equity	25,728	117,037
Total liabilities and stockholders' equity	$ 511,503	$ 539,971
Preferred stock - shares authorized	5,000,000	5,000,000
Preferred stock - par value	$ 0.001	$ 0.001
Preferred stock - shares issued	0	0
Common stock - shares authorized	75,000,000	75,000,000
Common stock - par value	$ 0.001	$ 0.001
Treasury stock - shares	4,680,723	4,680,723

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Allowance for bad debts	$ 1,182,000	$ 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	49,020,405	48,142,267
Common stock - shares outstanding	44,339,682	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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue from Contract with Customer, Including Assessed Tax	$ 62,401	$ 63,747	$ 123,779	$ 130,058
Cost of Goods and Services Sold	26,404	25,950	52,896	54,677
Gross Profit	35,997	37,797	70,883	75,381
Operating Expenses
Selling and Marketing Expense	21,190	21,011	42,754	45,931
General and Administrative Expense	11,018	13,528	24,472	28,408
Research and development	20,095	18,397	40,553	37,533
Income from operations	(16,306)	(15,139)	(36,896)	(36,491)
Other income (expense):
Convertible debt interest and amortization	(1,576)	(2,085)	(3,152)	(4,147)
Other Nonoperating Income (Expense)	4	146	290	977
Loss before income tax provision	(17,878)	(17,078)	(39,758)	(39,661)
Income tax provision (benefit)	168	130	317	282
Net income (loss)	$ (18,046)	$ (17,208)	$ (40,075)	$ (39,943)
Earnings Per Share, Basic	$ (0.41)	$ (0.40)	$ (0.90)	$ (0.92)
Net earnings (loss) per share:
Earnings Per Share, Basic and Diluted	(0.41)	(0.40)	(0.90)	(0.92)
Earnings Per Share, Diluted	$ (0.41)	$ (0.40)	$ (0.90)	$ (0.92)
Weighted average number of shares:
Weighted Average Number of Shares Outstanding, Basic and Diluted	44,321	43,304	44,283	43,203
Weighted Average Number of Shares Outstanding, Basic	44,321	43,304	44,283	43,203
Other comprehensive income, net of tax:
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	$ 157	$ 86	$ (451)	$ (84)
Other comprehensive income	157	86	(451)	(84)
Comprehensive income (loss)	(17,889)	(17,122)	(40,526)	(40,027)
Accumulated Other Comprehensive Income, net of tax [Member]
Other comprehensive income, net of tax:
Other comprehensive income	157	86	(451)	(84)
Subscription and Circulation [Member]
Revenue from Contract with Customer, Including Assessed Tax	44,224	42,377	86,872	85,547
Cost of Goods and Services Sold	13,589	12,392	27,390	25,256
Maintenance [Member]
Revenue from Contract with Customer, Including Assessed Tax	8,570	11,741	18,244	24,264
Cost of Goods and Services Sold	2,157	2,610	4,415	5,400
Subscription, maintenance and support
Revenue from Contract with Customer, Including Assessed Tax	52,794	54,118	105,116	109,811
Cost of Goods and Services Sold	15,746	15,002	31,805	30,656
Service [Member]
Revenue from Contract with Customer, Including Assessed Tax	9,607	9,629	18,663	20,247
Cost of Goods and Services Sold	$ 10,658	$ 10,948	$ 21,091	$ 24,021

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities:
Net income (loss)	$ (40,075,000)	$ (39,943,000)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, Depletion and Amortization	6,092,000	6,933,000
Amortization of Financing Costs and Discounts	746,000	3,448,000
Share-based compensation	16,776,000	12,099,000
Provision for doubtful accounts	(1,690,000)	5,286,000
Changes in operating assets and liabilities:
Accounts and unbilled receivables	9,919,000	5,116,000
Increase (Decrease) in Deferred Costs	1,409,000	1,626,000
Prepaid expenses and other assets	1,095,000	323,000
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	26,000	6,122,000
Accounts payable	899,000	(2,525,000)
Accrued liabilities	(201,000)	(6,623,000)
Accrued payroll and other employee benefits	(2,975,000)	(14,979,000)
Deferred revenue	(1,435,000)	(23,838,000)
Net cash provided by (used in) operating activities	(9,414,000)	(46,955,000)
Investing activities:
Purchases of property and equipment	(2,085,000)	(19,198,000)
Internal-use software development costs capitalized	0	(806,000)
Payments to Acquire Other Investments	(501,000)	0
Net cash provided by (used in) investing activities	(2,586,000)	(20,004,000)
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)	(20,221,000)
Net cash provided by (used in) financing activities	1,244,000	(18,857,000)
Effect of Exchange Rate on Cash and Cash Equivalents	(52,000)	(104,000)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(10,808,000)	(85,920,000)
Cash and cash equivalents:
Beginning of period	329,134,000	306,077,000
End of period	318,326,000	220,157,000
Capital Expenditures Incurred but Not yet Paid	$ 335,000	$ 3,538,000

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			647,401
Stock Issued During Period, Value, Restricted Stock Award, Gross	(20,221)		$ 1	(20,222)
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	$ 12,058			12,058
Other Comprehensive Income (Loss), Net of Tax	(84)							(84)
Net Income (Loss) Attributable to Parent	(39,943)					(39,943)
Treasury Stock, Shares - Enging Balance at Jun. 30, 2020					4,680,723
Stockholders' Equity Attributable to Parent- Ending Balance at Jun. 30, 2020	118,170		$ 48	553,696	$ (29,847)	(401,732)		(3,995)
Common Stock, Shares, Outstanding, Ending Balance at Jun. 30, 2020			43,304,461
Common Stock, Shares, Outstanding, Beginning Balance at Mar. 31, 2020			43,291,660
Stockholders' Equity Attributable to Parent- Beginning Balance at Mar. 31, 2020	129,610		$ 48	548,014	$ (29,847)	(384,524)		(4,081)
Treasury Stock, Shares - Beginning Balance at Mar. 31, 2020					4,680,723
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures			12,801
Stock Issued During Period, Value, Restricted Stock Award, Gross	(49)			(49)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	5,731			5,731
Other Comprehensive Income (Loss), Net of Tax	86							86
Net Income (Loss) Attributable to Parent	(17,208)					(17,208)
Treasury Stock, Shares - Enging Balance at Jun. 30, 2020					4,680,723
Stockholders' Equity Attributable to Parent- Ending Balance at Jun. 30, 2020	$ 118,170		$ 48	553,696	$ (29,847)	(401,732)		(3,995)
Common Stock, Shares, Outstanding, Ending Balance at Jun. 30, 2020			43,304,461
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			836,168
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	16,741			16,741
Other Comprehensive Income (Loss), Net of Tax	(451)							(451)
Net Income (Loss) Attributable to Parent	$ (40,075)					(40,075)
Treasury Stock, Shares - Enging Balance at Jun. 30, 2021	4,680,723				4,680,723
Stockholders' Equity Attributable to Parent- Ending Balance at Jun. 30, 2021	$ 25,728		$ 49	526,926	$ (29,847)	(467,518)		(3,882)
Common Stock, Shares, Outstanding, Ending Balance at Jun. 30, 2021	44,339,682		44,339,682
Common Stock, Shares, Outstanding, Beginning Balance at Mar. 31, 2021			44,252,765
Stockholders' Equity Attributable to Parent- Beginning Balance at Mar. 31, 2021	$ 35,029		$ 49	518,338	$ (29,847)	(449,472)		(4,039)
Treasury Stock, Shares - Beginning Balance at Mar. 31, 2021					4,680,723
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures			86,917
Stock Issued During Period, Value, Restricted Stock Award, Gross	$ 0
Stock Issued During Period, Shares, Employee Stock Purchase Plans	0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	$ 8,588			8,588
Other Comprehensive Income (Loss), Net of Tax	157							157
Net Income (Loss) Attributable to Parent	$ (18,046)					(18,046)
Treasury Stock, Shares - Enging Balance at Jun. 30, 2021	4,680,723				4,680,723
Stockholders' Equity Attributable to Parent- Ending Balance at Jun. 30, 2021	$ 25,728		$ 49	$ 526,926	$ (29,847)	$ (467,518)		$ (3,882)
Common Stock, Shares, Outstanding, Ending Balance at Jun. 30, 2021	44,339,682		44,339,682

Organization and Nature of Oper

Organization and Nature of Operations	6 Months Ended
	Jun. 30, 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 software-as-a-service ("SaaS") solutions that optimize shopping and selling experiences. Built on the PROS platform, these intelligent solutions leverage business artificial intelligence ("AI"), intuitive user experiences and process automation to deliver frictionless, personalized purchasing experiences designed to meet the real-time demands of today’s business-to-business ("B2B") and business-to-consumer ("B2C") omnichannel shoppers, regardless of industry. Companies can use these 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.

Summary of Significant Accounti

Summary of Significant Accounting Policies (Notes)	6 Months Ended
	Jun. 30, 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 June 30, 2021, the results of operations for the three and six months ended June 30, 2021 and 2020, cash flows for the six months ended June 30, 2021 and 2020, and stockholders' equity for the three and six months ended June 30, 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 $293.8 million and $301.3 million at June 30, 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 $17.1 million and $18.5 million as of June 30, 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 June 30, 2021 and 2020, respectively, and $3.1 million and $2.9 million for the six months ended June 30, 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 $2.7 million and $2.9 million as of June 30, 2021 and December 31, 2020, respectively. Amortization expense for the deferred implementation costs was $0.3 million and $0.6 million for the three months ended June 30, 2021 and 2020, respectively, and $0.6 million and $1.0 million for the six months ended June 30, 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 a decrease 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 three and six months ended June 30, 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 six months ended June 30, 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)	6 Months Ended
	Jun. 30, 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 June 30, 2021 and 2020, the Company recognized approximately $45.3 million and $48.8 million, respectively, and for the six months ended June 30, 2021 and 2020, the Company recognized approximately $70.3 million and $84.0 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 June 30, 2021, the Company expects to recognize approximately $390.5 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 $190.3 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)	6 Months Ended
	Jun. 30, 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 and six months ended June 30, 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 June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Revenue Percent Revenue Percent Revenue Percent Revenue Percent United States of America $ 21,875 35 % $ 20,715 32 % $ 42,751 35 % $ 42,515 33 % Europe 18,562 30 % 17,682 28 % 37,254 30 % 37,612 29 % The rest of the world 21,964 35 % 25,350 40 % 43,774 35 % 49,931 38 % Total revenue $ 62,401 100 % $ 63,747 100 % $ 123,779 100 % $ 130,058 100 %

Leases (Notes)

Leases (Notes)	6 Months Ended
	Jun. 30, 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 June 30, 2021, the Company did not have any finance leases. Supplemental cash flow information related to leases was as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Cash paid for operating lease liabilities $ 1,917 $ 1,973 $ 4,378 $ 3,600 Right-of-use asset obtained in exchange for operating lease liability $ 194 $ — $ 291 $ 1,759 As of June 30, 2021, maturities of lease liabilities were as follows (in thousands): Year Ending December 31, Amount Remaining 2021 $ 4,894 2022 10,468 2023 11,374 2024 5,383 2025 4,253 2026 4,134 Thereafter 27,726 Total operating lease payments 68,232 Less: Imputed interest (19,807) Less: Anticipated lease incentive (1,385) Total operating lease liabilities $ 47,040

Noncash Share-based Compensatio

Noncash Share-based Compensation (Note)	6 Months Ended
	Jun. 30, 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 the Company's stockholders in May 2019 and reserved an aggregate amount of 4,550,000 shares available for issuance. In May 2021, the Company's stockholders approved an amendment to the 2017 Stock Plan increasing the aggregate amount of shares available for issuance to 7,650,000. As of June 30, 2021, 4,047,069 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 June 30, 2021 and December 31, 2020, respectively, (in thousands): Award type June 30, 2021 December 31, 2020 Restricted stock units (time-based) 1,869 1,802 Restricted stock units (performance-based) 140 162 Stock appreciation rights — 28 Market stock units 126 111 During the three months ended June 30, 2021, the Company granted 39,695 RSUs (time-based) with a weighted average grant-date fair value of $38.32 per share. During the six months ended June 30, 2021, the Company granted 823,589 RSUs (time-based) with a weighted average grant-date fair value of $47.59 per share. The Company also granted 125,541 MSUs with a weighted average grant-date fair value of $56.05 to certain executive employees during the six months ended June 30, 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 six months ended June 30, 2021. The assumptions used to value the MSUs granted during the six months ended June 30, 2021 were as follows: June 30, 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 and six months ended June 30, 2021 and 2020: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Share-based compensation: Cost of revenue $ 976 $ 502 $ 1,802 $ 1,026 Operating expenses: Selling and marketing 2,510 1,965 4,734 3,831 Research and development 2,117 1,368 3,943 2,875 General and administrative 3,003 1,917 6,297 4,367 Total included in operating expenses 7,630 5,250 14,974 11,073 Total share-based compensation expense $ 8,606 $ 5,752 $ 16,776 $ 12,099 At June 30, 2021, the Company had an estimated $78.4 million of total unrecognized compensation costs related to share-based compensation arrangements. These costs will be recognized over a weighted average period o f 2.8 years. The Company's Employee Stock Purchase Plan (as amended, the "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. In May 2021, the Company's stockholders approved an amendment to the ESPP Plan increasing the aggregate amount of shares available for issuance under the ESPP to 1,000,000. During the three and six months ended June 30, 2021, the Company issued zero and 41,970 shares under the ESPP, respectively. As of June 30, 2021, 532,824 shares remain authorized and available for issuance under the ESPP. As of June 30, 2021, the Company held approximately $1.5 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)	6 Months Ended
	Jun. 30, 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 June 30, 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 $ — $ 141,210 1% 2.25% Convertible Notes due in 2027 ("2027 Notes") September 2020 $ 150,000 $ — $ 146,332 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 June 30, 2021, the 2027 and 2024 Notes are not yet convertible and their remaining term is approximately 74 months and 34 months, respectively. As of June 30, 2021 and December 31, 2020, the fair value of the principal amount of the Notes in the aggregate was $342.9 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 a decrease to accumulated deficit. The Notes consist of the following (in thousands): June 30, 2021 December 31, 2020 Liability component: Principal $ 293,750 $ 293,750 Less: debt discount and issuance cost, net of amortization (6,208) (75,722) Net carrying amount $ 287,542 $ 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 June 30, Six Months Ended June 30, 2021 2020 2021 2020 Coupon interest $ 1,203 $ 359 $ 2,406 $ 719 Amortization of debt issuance costs 373 158 746 314 Amortization of debt discount — 1,568 — 3,114 Total $ 1,576 $ 2,085 $ 3,152 $ 4,147 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	6 Months Ended
	Jun. 30, 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 June 30, 2021 was $24.9 million f or the remaining period through the expiration of the agreement.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 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 June 30, 2021, the results of operations for the three and six months ended June 30, 2021 and 2020, cash flows for the six months ended June 30, 2021 and 2020, and stockholders' equity for the three and six months ended June 30, 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 $293.8 million and $301.3 million at June 30, 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 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 $17.1 million and $18.5 million as of June 30, 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 June 30, 2021 and 2020, respectively, and $3.1 million and $2.9 million for the six months ended June 30, 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 $2.7 million and $2.9 million as of June 30, 2021 and December 31, 2020, respectively. Amortization expense for the deferred implementation costs was $0.3 million and $0.6 million for the three months ended June 30, 2021 and 2020, respectively, and $0.6 million and $1.0 million for the six months ended June 30, 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 a decrease 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 three and six months ended June 30, 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 six months ended June 30, 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)	6 Months Ended
	Jun. 30, 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 and six months ended June 30, 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 June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Revenue Percent Revenue Percent Revenue Percent Revenue Percent United States of America $ 21,875 35 % $ 20,715 32 % $ 42,751 35 % $ 42,515 33 % Europe 18,562 30 % 17,682 28 % 37,254 30 % 37,612 29 % The rest of the world 21,964 35 % 25,350 40 % 43,774 35 % 49,931 38 % Total revenue $ 62,401 100 % $ 63,747 100 % $ 123,779 100 % $ 130,058 100 %

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Supplemental Lease Information [Table Text Block]	Supplemental cash flow information related to leases was as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Cash paid for operating lease liabilities $ 1,917 $ 1,973 $ 4,378 $ 3,600 Right-of-use asset obtained in exchange for operating lease liability $ 194 $ — $ 291 $ 1,759
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	As of June 30, 2021, maturities of lease liabilities were as follows (in thousands): Year Ending December 31, Amount Remaining 2021 $ 4,894 2022 10,468 2023 11,374 2024 5,383 2025 4,253 2026 4,134 Thereafter 27,726 Total operating lease payments 68,232 Less: Imputed interest (19,807) Less: Anticipated lease incentive (1,385) Total operating lease liabilities $ 47,040

Earnings per Share (Table)

Earnings per Share (Table)	6 Months Ended
	Jun. 30, 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 and six months ended June 30, 2021 and 2020: Three Months Ended June 30, Six Months Ended June 30, (in thousands, except per share data) 2021 2020 2021 2020 Numerator: Net loss $ (18,046) $ (17,208) $ (40,075) $ (39,943) Denominator: Weighted average shares (basic) 44,321 43,304 44,283 43,203 Dilutive effect of potential common shares — — — — Weighted average shares (diluted) 44,321 43,304 44,283 43,203 Basic loss per share $ (0.41) $ (0.40) $ (0.90) $ (0.92) Diluted loss per share $ (0.41) $ (0.40) $ (0.90) $ (0.92)

Noncash Share-based Compensat_2

Noncash Share-based Compensation (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2021 and December 31, 2020, respectively, (in thousands): Award type June 30, 2021 December 31, 2020 Restricted stock units (time-based) 1,869 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 and six months ended June 30, 2021 and 2020: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Share-based compensation: Cost of revenue $ 976 $ 502 $ 1,802 $ 1,026 Operating expenses: Selling and marketing 2,510 1,965 4,734 3,831 Research and development 2,117 1,368 3,943 2,875 General and administrative 3,003 1,917 6,297 4,367 Total included in operating expenses 7,630 5,250 14,974 11,073 Total share-based compensation expense $ 8,606 $ 5,752 $ 16,776 $ 12,099
Market Stock Units Valuation Assumptions	The assumptions used to value the MSUs granted during the six months ended June 30, 2021 were as follows: June 30, 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)	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Schedule of Debt [Table Text Block]	The following is a summary of the Company's convertible senior notes as of June 30, 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 $ — $ 141,210 1% 2.25% Convertible Notes due in 2027 ("2027 Notes") September 2020 $ 150,000 $ — $ 146,332 2.25%
Convertible Debt [Table Text Block]	The Notes consist of the following (in thousands): June 30, 2021 December 31, 2020 Liability component: Principal $ 293,750 $ 293,750 Less: debt discount and issuance cost, net of amortization (6,208) (75,722) Net carrying amount $ 287,542 $ 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 June 30, Six Months Ended June 30, 2021 2020 2021 2020 Coupon interest $ 1,203 $ 359 $ 2,406 $ 719 Amortization of debt issuance costs 373 158 746 314 Amortization of debt discount — 1,568 — 3,114 Total $ 1,576 $ 2,085 $ 3,152 $ 4,147

Summary of Significant Accoun_3

Summary of Significant Accounting Policies Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Summary of Significant Accounting Policies [Line Items]
Treasury money market funds, at fair value	$ 293.8		$ 293.8		$ 301.3
Deferred Costs	17.1		17.1		18.5
Amortization of Deferred Charges	1.5	$ 1.4	3.1	$ 2.9
Capitalized Contract Cost, Net	2.7		2.7		$ 2.9
Capitalized Contract Cost, Amortization	$ 0.3	$ 0.6	$ 0.6	$ 1

Summary of Significant Accoun_4

Summary of Significant Accounting Policies New Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jan. 01, 2021	Jun. 30, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained Earnings (Accumulated Deficit)		$ (467,518)	$ (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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Deferred Revenue and Performance Obligation [Abstract]
Deferred Revenue, Revenue Recognized	$ 45.3	$ 48.8	$ 70.3	$ 84
Revenue, Remaining Performance Obligation, Amount	390.5		390.5
Revenue Remaining Performance Obligation, to be recognized within 12 months	$ 190.3		$ 190.3

Disaggregation of Revenue Reven

Disaggregation of Revenue Revenue by Geography (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues	$ 62,401	$ 63,747	$ 123,779	$ 130,058
Percentage of total revenue	100.00%	100.00%	100.00%	100.00%
UNITED STATES
Revenues	$ 21,875	$ 20,715	$ 42,751	$ 42,515
Percentage of total revenue	35.00%	32.00%	35.00%	33.00%
Europe [Member]
Revenues	$ 18,562	$ 17,682	$ 37,254	$ 37,612
Percentage of total revenue	30.00%	28.00%	30.00%	29.00%
The rest of the world [Member]
Revenues	$ 21,964	$ 25,350	$ 43,774	$ 49,931
Percentage of total revenue	35.00%	40.00%	35.00%	38.00%

Leases (Details)

Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Option to Renew	15 years		15 years
Lessee, Operating Lease, Termination Option			1 year
Operating Lease, Payments	$ 1,917	$ 1,973	$ 4,378	$ 3,600
Right-of-use Asset Obtained in Exchange for Operating Lease Liability	$ 194	$ 0	$ 291	$ 1,759
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year		1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	12 years		12 years

Leases Schedule of lease liabil

Leases Schedule of lease liability maturities (Details) $ in Thousands	Jun. 30, 2021USD ($)
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Remaining 2021	$ 4,894
2022	10,468
2023	11,374
2024	5,383
2025	4,253
2026	4,134
Thereafter	27,726
Operating Leases, Payments Due	68,232
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(19,807)
Lessee, Operating Lease, Anticipated Incentives	(1,385)
Operating Lease, Liability	$ 47,040

Earnings per Share (Details)

Earnings per Share (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 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	1.2	1.3	1.4
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	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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator
Net income (loss)	$ (18,046)	$ (17,208)	$ (40,075)	$ (39,943)
Denominator
Weighted average shares (basic)	44,321	43,304	44,283	43,203
Dilutive effect of potential common shares	0	0	0	0
Weighted average shares (diluted)	44,321	43,304	44,283	43,203
Basic Earnings Per Share	$ (0.41)	$ (0.40)	$ (0.90)	$ (0.92)
Diluted earnings per share	$ (0.41)	$ (0.40)	$ (0.90)	$ (0.92)

Noncash Share-based Compensat_3

Noncash Share-based Compensation (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2021USD ($)$ / sharesshares	Jun. 30, 2021USD ($)$ / sharesshares
Noncash Share-based Compensation (Narrative) [Line Items]
Unrecognized compensation cost related to share-based compensation | $	$ 78,400,000	$ 78,400,000
Weighted average period to recognize cost, in years		2 years 9 months 18 days
Share-based compensation arrangement by share-based payment, Minimum Employee Subscription rate	1.00%	1.00%
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate	10.00%	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	0	41,970
ESPP contributions by Employees | $		$ 1,500,000
RSUs
Noncash Share-based Compensation (Narrative) [Line Items]
Awards, other than options, granted in period	39,695	823,589
Weighted average grant date fair value, per share, of awards granted in period | $ / shares	$ 38.32	$ 47.59
Employee Stock [Member]
Noncash Share-based Compensation (Narrative) [Line Items]
Shares reserved for issuance under Plan	1,000,000	1,000,000
Shares available for future grants	532,824	532,824
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	4,550,000	4,550,000
Shares available for future grants	4,047,069	4,047,069
2017 Amended Equity Incentive Plan [Member]
Noncash Share-based Compensation (Narrative) [Line Items]
Shares reserved for issuance under Plan	7,650,000	7,650,000

Noncash Share-based Compensat_4

Noncash Share-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 8,606	$ 5,752	$ 16,776	$ 12,099
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	976	502	1,802	1,026
Selling and Marketing Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	2,510	1,965	4,734	3,831
General and Administrative Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	3,003	1,917	6,297	4,367
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	2,117	1,368	3,943	2,875
Operating Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 7,630	$ 5,250	$ 14,974	$ 11,073

Noncash Share-based Compensat_5

Noncash Share-based Compensation Awards outstanding (Details) - shares shares in Thousands	Jun. 30, 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	1,869	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]	6 Months Ended
	Jun. 30, 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 ($)	Jun. 30, 2021USD ($)$ / shares	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)$ / shares	Jun. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 293,750		$ 293,750		$ 293,750
Convertible Debt, Noncurrent		287,542		287,542		218,028
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		6,208		6,208		75,722
Convertible Debt		287,542		287,542		218,028
Debt Instrument, Convertible, Carrying Amount of Equity Component		0		0		80,098
Debt Instrument, Periodic Payment, Interest		1,203	$ 359	2,406	$ 719
Amortization of Financing Costs		373	158	746	314
Amortization of Debt Discount (Premium)		0	1,568	0	3,114
Interest Expense, Debt		1,576	$ 2,085	3,152	$ 4,147
Debt Instrument, Fair Value Disclosure		$ 342,900		$ 342,900		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		$ 101.62
Debt Instrument, Face Amount		$ 143,750		$ 143,750
Convertible Debt, Current		0		0
Convertible Debt, Noncurrent		$ 141,210		$ 141,210
Debt Instrument, Convertible, Carrying Amount of Equity Component						32,900
Debt Instrument, Convertible, Remaining Discount Amortization Period				34 months
Purchase of convertible bond hedge				$ 16,400
Debt Instrument, Interest Rate, Stated Percentage		1.00%		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		$ 78.90
Debt Instrument, Face Amount		$ 150,000		$ 150,000
Convertible Debt, Current		0		0
Convertible Debt, Noncurrent		$ 146,332		$ 146,332
Debt Instrument, Convertible, Carrying Amount of Equity Component						$ 47,200
Debt Instrument, Convertible, Remaining Discount Amortization Period				74 months
Purchase of convertible bond hedge				$ 25,300
Debt Instrument, Interest Rate, Stated Percentage		2.25%		2.25%

Commitments and Contingencies P

Commitments and Contingencies Purchase commitments (Details) $ in Millions	Jun. 30, 2021USD ($)
Long-term Purchase Commitment [Line Items]
Purchase Obligation	$ 24.9