Summary of Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2020
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 September 30, 2020, the results of operations for the three and nine months ended September 30, 2020 and 2019, cash flows for the nine months ended September 30, 2020 and 2019, and stockholders' equity for the three and nine months ended September 30, 2020 and 2019. 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, 2019 ("Annual Report") filed with the SEC. The unaudited condensed consolidated balance sheet as of December 31, 2019 was derived from the Company's audited consolidated financial statements but does not include all disclosures required under GAAP. Certain prior year amounts have been reclassified for consistency with the current year presentation. This insignificant reclassification had no effect on the reported results of operations. License revenue and license cost of revenue are now combined with subscription revenue and subscription cost of revenue, respectively. Risks and uncertainties Coronavirus ("COVID-19") continues to spread throughout the U.S. and the world and compliance 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 this impact could last for an indefinite period of time. There are no comparable recent events that provide guidance as to the effect of the spread of COVID-19 as a global pandemic, and as a result, 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. For a full discussion on the ongoing impact of COVID-19 to the Company's business, please see "We must successfully navigate the demand, supply and operational challenges associated with the ongoing coronavirus (COVID-19) pandemic" under Part II, Item 1A of this Quarterly Report on Form 10-Q.
Accounting Changes [Text Block]	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, 2019, 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 $181.3 million and $273.1 million at September 30, 2020 and December 31, 2019, 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. There are no comparable recent events that provide guidance as to the effect of the spread of COVID-19 as a global pandemic. As a result, the impact of COVID-19 is highly uncertain and subject to change. The Company does not yet know the full extent of the impact from COVID-19 to the Company's business operations or the global economy as a whole; however, the impact could have an adverse effect on the Company's customers and inherently the related receivables.
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 $18.9 million and $21.2 million as of September 30, 2020 and December 31, 2019, respectively. Amortization expense for the deferred costs was $1.5 million and $1.3 million for the three months ended September 30, 2020 and 2019, respectively, and $4.3 million and $3.5 million for the nine months ended September 30, 2020 and 2019, 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 $3.2 million and $4.4 million as of September 30, 2020 and December 31, 2019, respectively. Amortization expense for the deferred implementation costs was $0.4 million for the three months ended September 30, 2020 and 2019 and $1.4 million and $1.0 million for the nine months ended September 30, 2020 and 2019, 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 June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ("Topic 326"), in order to improve financial reporting of expected credit losses on financial instruments and other commitments to extend credit. Topic 326 requires that an entity measure and recognize expected credit losses for financial assets held at amortized cost and replaces the incurred loss impairment methodology in current GAAP with a methodology that requires consideration of a broader range of information to estimate credit losses. The Company adopted Topic 326 as of January 1, 2020 using the modified retrospective method and there was no material impact on the Company's unaudited condensed consolidated financial statements as of the adoption date. As of September 30, 2020, the Company has recorded allowance for doubtful accounts related to trade receivables of $4.6 million primarily due to increased credit risk from uncertain economic conditions caused by COVID-19. Recently issued accounting pronouncements not yet adopted 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 is currently assessing the impact of the adoption of the standard on its financial statements. With the exception of the new standards discussed above, there have been no other recent accounting pronouncements or changes in accounting pronouncements during the nine months ended September 30, 2020, as compared to the recent accounting pronouncements described in the Company's Annual Report, that are of significance or potential significance to the Company.

Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2020

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 September 30, 2020, the results of operations for the three and nine months ended September 30, 2020 and 2019, cash flows for the nine months ended September 30, 2020 and 2019, and stockholders' equity for the three and nine months ended September 30, 2020 and 2019.

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, 2019 ("Annual Report") filed with the SEC. The unaudited condensed consolidated balance sheet as of December 31, 2019 was derived from the Company's audited consolidated financial statements but does not include all disclosures required under GAAP.

Certain prior year amounts have been reclassified for consistency with the current year presentation. This insignificant reclassification had no effect on the reported results of operations. License revenue and license cost of revenue are now combined with subscription revenue and subscription cost of revenue, respectively.

Risks and uncertainties

Coronavirus ("COVID-19") continues to spread throughout the U.S. and the world and compliance 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 this impact could last for an indefinite period of time. There are no comparable recent events that provide guidance as to the effect of the spread of COVID-19 as a global pandemic, and as a result, 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. For a full discussion on the ongoing impact of COVID-19 to the Company's business, please see "We must successfully navigate the demand, supply and operational challenges associated with the ongoing coronavirus (COVID-19) pandemic" under Part II, Item 1A of this Quarterly Report on Form 10-Q.

Accounting Changes [Text Block]

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, 2019, 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 $181.3 million and $273.1 million at September 30, 2020 and December 31, 2019, 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.

There are no comparable recent events that provide guidance as to the effect of the spread of COVID-19 as a global pandemic. As a result, the impact of COVID-19 is highly uncertain and subject to change. The Company does not yet know the full extent of the impact from COVID-19 to the Company's business operations or the global economy as a whole; however, the impact could have an adverse effect on the Company's customers and inherently the related receivables.

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 $18.9 million and $21.2 million as of September 30, 2020 and December 31, 2019, respectively. Amortization expense for the deferred costs was $1.5 million and $1.3 million for the three months ended September 30, 2020 and 2019, respectively, and $4.3 million and $3.5 million for the nine months ended September 30, 2020 and 2019, 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 $3.2 million and $4.4 million as of September 30, 2020 and December 31, 2019, respectively. Amortization expense for the deferred implementation costs was $0.4 million for the three months ended September 30, 2020 and 2019 and $1.4 million and $1.0 million for the nine months ended September 30, 2020 and 2019, 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 June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ("Topic 326"), in order to improve financial reporting of expected credit losses on financial instruments and other commitments to extend credit. Topic 326 requires that an entity measure and recognize expected credit losses for financial assets held at amortized cost and replaces the incurred loss impairment methodology in current GAAP with a methodology that requires consideration of a broader range of information to estimate credit losses. The Company adopted Topic 326 as of January 1, 2020 using the modified retrospective method and there was no material impact on the Company's unaudited condensed consolidated financial statements as of the adoption date. As of September 30, 2020, the Company has recorded allowance for doubtful accounts related to trade receivables of $4.6 million primarily due to increased credit risk from uncertain economic conditions caused by COVID-19.

Recently issued accounting pronouncements not yet adopted

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 is currently assessing the impact of the adoption of the standard on its financial statements.

With the exception of the new standards discussed above, there have been no other recent accounting pronouncements or changes in accounting pronouncements during the nine months ended September 30, 2020, as compared to the recent accounting pronouncements described in the Company's Annual Report, that are of significance or potential significance to the Company.