Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2020
Accounting Policies [Abstract]
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The accompanying unaudited condensed consolidated financial statements, which include the assets, liabilities, results of operations and cash flows of the Company have been prepared in accordance with: (i) generally accepted accounting principles in the United States (“U.S. GAAP”) for interim financial information; (ii) the instructions to Form 10-Q; and (iii) the guidance of Rule 10-01 of Regulation S-X under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), for financial statements required to be filed with the Securities and Exchange Commission (the “SEC”). As permitted under such rules, certain notes and other financial information normally required by U.S. GAAP have been condensed or omitted. The Company believes the condensed consolidated financial statements reflect all normal and recurring adjustments necessary for a fair statement of the Company’s financial position, results of operations, and cash flows as of and for the periods presented herein. The Company’s results of operations for the three and nine months ended September 30, 2020 and 2019 may not be indicative of the Company’s future results. These condensed consolidated financial statements are unaudited and should be read in conjunction with the Company’s audited consolidated financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019. All significant intercompany accounts and transactions have been eliminated in consolidation. The condensed consolidated balance sheet data as of December 31, 2019 was derived from the audited financial statements, but does not include all disclosures required by U.S. GAAP on an annual reporting basis.
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in accordance with U.S. GAAP requires management to make certain estimates and assumptions that affect the amounts reported herein. The Company bases its estimates and assumptions on historical experience and on various other factors that it believes to be reasonable under the circumstances. Significant estimates and assumptions are inherent in the analysis and the measurement of provisions for credit losses, acquired intangible assets, the recoverability of goodwill, deferred tax assets, and convertible senior notes. Due to the inherent uncertainty involved in making estimates, particularly in light of the COVID-19 pandemic, actual results reported in future periods may be affected by changes in those estimates. The Company evaluates its estimates and assumptions on an ongoing basis.
Accounts Receivable, Contract Assets and Liabilities	Accounts Receivable, Contract Assets and Liabilities Balance sheet items related to contracts consist of accounts receivable, net and deferred revenue on the Company’s condensed consolidated balance sheets. Accounts receivable, net includes trade accounts receivable, which are comprised of billed and unbilled revenue. Accounts receivable, net is stated at amortized cost net of provision for credit losses. The Company’s methodology to measure the provision for credit losses requires an estimation of loss rates based upon historical loss experience adjusted for factors that are relevant to determining the expected collectability of accounts receivable. Some of these factors include current market conditions, delinquency trends, aging behavior of receivables and credit and liquidity quality indicators for industry groups, customer classes or individual customers. The Company’s estimates are reviewed and revised periodically based on the ongoing evaluation of credit quality indicators. Historically, actual write-offs for uncollectible accounts have not significantly differed from prior estimates. The Company recognizes unbilled revenue when revenue recognition occurs in advance of billings. Unbilled revenue is recognized in the Graduate Program Segment because billings to university clients do not occur until after the academic term has commenced and final enrollment information is available. The Company’s unbilled revenue represents contract assets. Unbilled accounts receivable is recognized in the Alternative Credential Segment once the presentation period commences for amounts to be invoiced to students under installment plans that are paid over the same presentation period.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In August 2020, the FASB issued ASU No. 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity. This ASU simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts indexed to and potentially settled in an entity’s own equity. The new guidance eliminates the beneficial conversion and cash conversion accounting models for convertible instruments. As a result, in more cases, convertible debt will be accounted for as a single instrument. The guidance also removes certain conditions for equity classification related to contracts in an entity’s own equity and requires the application of the if-converted method for calculating diluted earnings per share. This ASU is effective for fiscal years beginning after December 15, 2021. Early adoption is permitted. The Company is evaluating the impact that this ASU will have on its condensed consolidated financial statements and related disclosures. In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. This ASU is intended to provide optional expedients and exceptions for applying U.S. GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, to ease the potential accounting and financial reporting burden associated with the expected market transition from the London Interbank Offered Rate (“LIBOR”) and other interbank offered rates to alternative reference rates. This ASU may be applied as of the beginning of any interim period that includes its effective date (i.e., March 12, 2020) through December 31, 2022. The Company does not expect the adoption of this standard to have a material impact on its condensed consolidated financial statements or related disclosures. In January 2020, the FASB issued ASU No. 2020-01, Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815): Clarifying the Interactions between Topic 321, Topic 323, and Topic 815. ASU No. 2020-01 was issued to clarify the interaction of the accounting for equity securities under ASC 321 and investments accounted for under the equity method of accounting in ASC 323 and the accounting for certain forward contracts and purchased options accounted for under ASC 815. With respect to the interactions between ASC 321 and ASC 323, the amendments clarify that an entity should consider observable transactions that require it to either apply or discontinue the equity method of accounting when applying the measurement alternative in ASC 321, immediately before applying or discontinuing the equity method of accounting. The amendments in this ASU are effective for interim and annual reporting periods beginning after December 15, 2020. Early adoption is permitted, including adoption in any interim period. The Company is evaluating the impact that this ASU will have on its condensed consolidated financial statements and related disclosures. In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, as part of its initiative to reduce complexity in the accounting standards. The amendments in the ASU include removal of certain exceptions to the general principles in Topic 740 related to recognizing deferred taxes for investments, performing intraperiod tax allocation and calculating income taxes in an interim period. The ASU also clarifies and simplifies other aspects of the accounting for income taxes, including the recognition of deferred tax liabilities for outside basis differences. The amendments in this ASU are effective for annual and interim periods in fiscal years beginning after December 15, 2020, with early adoption permitted. The Company is evaluating the impact that this ASU will have on its condensed consolidated financial statements and related disclosures. In April 2019, the FASB issued ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments. ASU No. 2019-04 provides corrections, updates and clarifications to the previously issued updates of ASU No. 2016-01, ASU No. 2016-13 and ASU No. 2017-12. Various areas of the ASC were impacted by the update. This standard follows the effective dates of the previously issued ASUs, unless an entity has already early adopted the previous ASUs, in which case the effective date will vary according to each specific ASU adoption. The Company adopted the amendments related to ASU Nos. 2016-01 and 2016-13 on January 1, 2020 under the modified retrospective transition method, with the exception of the amendments related to equity securities without readily determinable fair values for which an entity elects the measurement alternative, which have been adopted prospectively. Adoption of these amendments did not have a material impact on the Company’s condensed consolidated financial statements or related disclosures. Refer below for further discussion of ASU No. 2016-13. The amendments to ASU No. 2017-12 are not applicable to the Company. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. Subsequently, the FASB has issued the following standards related to ASU No. 2016-13: ASU No. 2019-11, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, ASU No. 2019-05, Financial Instruments—Credit Losses (Topic 326): Targeted Transition Relief; ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments; and ASU No. 2018-19, Codification Improvements to Topic 326, Financial Instruments—Credit Losses. ASU No. 2016-13 requires entities to measure all expected credit losses for most financial assets held at the reporting date based on an expected loss model, which includes historical experience, current conditions, and reasonable and supportable forecasts. Entities will now use forward-looking information to better form their credit loss estimates. ASU No. 2016-13 also requires enhanced disclosures to help financial statement users better understand assumptions used in estimating expected credit losses. The Company adopted this ASU and the related amendments on January 1, 2020 under the modified retrospective transition method, which resulted in no cumulative-effect adjustment to retained earnings.

Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2020

Basis of Presentation and Principles of Consolidation

The accompanying unaudited condensed consolidated financial statements, which include the assets, liabilities, results of operations and cash flows of the Company have been prepared in accordance with: (i) generally accepted accounting principles in the United States (“U.S. GAAP”) for interim financial information; (ii) the instructions to Form 10-Q; and (iii) the guidance of Rule 10-01 of Regulation S-X under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), for financial statements required to be filed with the Securities and Exchange Commission (the “SEC”). As permitted under such rules, certain notes and other financial information normally required by U.S. GAAP have been condensed or omitted. The Company believes the condensed consolidated financial statements reflect all normal and recurring adjustments necessary for a fair statement of the Company’s financial position, results of operations, and cash flows as of and for the periods presented herein. The Company’s results of operations for the three and nine months ended September 30, 2020 and 2019 may not be indicative of the Company’s future results. These condensed consolidated financial statements are unaudited and should be read in conjunction with the Company’s audited consolidated financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019. All significant intercompany accounts and transactions have been eliminated in consolidation.

The condensed consolidated balance sheet data as of December 31, 2019 was derived from the audited financial statements, but does not include all disclosures required by U.S. GAAP on an annual reporting basis.

Use of Estimates

The preparation of condensed consolidated financial statements in accordance with U.S. GAAP requires management to make certain estimates and assumptions that affect the amounts reported herein. The Company bases its estimates and assumptions on historical experience and on various other factors that it believes to be reasonable under the circumstances. Significant estimates and assumptions are inherent in the analysis and the measurement of provisions for credit losses, acquired intangible assets, the recoverability of goodwill, deferred tax assets, and convertible senior notes. Due to the inherent uncertainty involved in making estimates, particularly in light of the COVID-19 pandemic, actual results reported in future periods may be affected by changes in those estimates. The Company evaluates its estimates and assumptions on an ongoing basis.

Accounts Receivable, Contract Assets and Liabilities

Balance sheet items related to contracts consist of accounts receivable, net and deferred revenue on the Company’s condensed consolidated balance sheets. Accounts receivable, net includes trade accounts receivable, which are comprised of billed and unbilled revenue. Accounts receivable, net is stated at amortized cost net of provision for credit losses. The Company’s methodology to measure the provision for credit losses requires an estimation of loss rates based upon historical loss experience adjusted for factors that are relevant to determining the expected collectability of accounts receivable. Some of these factors include current market conditions, delinquency trends, aging behavior of receivables and credit and liquidity quality indicators for industry groups, customer classes or individual customers.

The Company’s estimates are reviewed and revised periodically based on the ongoing evaluation of credit quality indicators. Historically, actual write-offs for uncollectible accounts have not significantly differed from prior estimates. The Company recognizes unbilled revenue when revenue recognition occurs in advance of billings. Unbilled revenue is recognized in the Graduate Program Segment because billings to university clients do not occur until after the academic term has commenced and final enrollment information is available. The Company’s unbilled revenue represents contract assets. Unbilled accounts receivable is recognized in the Alternative Credential Segment once the presentation period commences for amounts to be invoiced to students under installment plans that are paid over the same presentation period.

Recent Accounting Pronouncements

In August 2020, the FASB issued ASU No. 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity. This ASU simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts indexed to and potentially settled in an entity’s own equity. The new guidance eliminates the beneficial conversion and cash conversion accounting models for

convertible instruments. As a result, in more cases, convertible debt will be accounted for as a single instrument. The guidance also removes certain conditions for equity classification related to contracts in an entity’s own equity and requires the application of the if-converted method for calculating diluted earnings per share. This ASU is effective for fiscal years beginning after December 15, 2021. Early adoption is permitted. The Company is evaluating the impact that this ASU will have on its condensed consolidated financial statements and related disclosures.

In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. This ASU is intended to provide optional expedients and exceptions for applying U.S. GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, to ease the potential accounting and financial reporting burden associated with the expected market transition from the London Interbank Offered Rate (“LIBOR”) and other interbank offered rates to alternative reference rates. This ASU may be applied as of the beginning of any interim period that includes its effective date (i.e., March 12, 2020) through December 31, 2022. The Company does not expect the adoption of this standard to have a material impact on its condensed consolidated financial statements or related disclosures.

In January 2020, the FASB issued ASU No. 2020-01, Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815): Clarifying the Interactions between Topic 321, Topic 323, and Topic 815. ASU No. 2020-01 was issued to clarify the interaction of the accounting for equity securities under ASC 321 and investments accounted for under the equity method of accounting in ASC 323 and the accounting for certain forward contracts and purchased options accounted for under ASC 815. With respect to the interactions between ASC 321 and ASC 323, the amendments clarify that an entity should consider observable transactions that require it to either apply or discontinue the equity method of accounting when applying the measurement alternative in ASC 321, immediately before applying or discontinuing the equity method of accounting. The amendments in this ASU are effective for interim and annual reporting periods beginning after December 15, 2020. Early adoption is permitted, including adoption in any interim period. The Company is evaluating the impact that this ASU will have on its condensed consolidated financial statements and related disclosures.

In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, as part of its initiative to reduce complexity in the accounting standards. The amendments in the ASU include removal of certain exceptions to the general principles in Topic 740 related to recognizing deferred taxes for investments, performing intraperiod tax allocation and calculating income taxes in an interim period. The ASU also clarifies and simplifies other aspects of the accounting for income taxes, including the recognition of deferred tax liabilities for outside basis differences. The amendments in this ASU are effective for annual and interim periods in fiscal years beginning after December 15, 2020, with early adoption permitted. The Company is evaluating the impact that this ASU will have on its condensed consolidated financial statements and related disclosures.

In April 2019, the FASB issued ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments. ASU No. 2019-04 provides corrections, updates and clarifications to the previously issued updates of ASU No. 2016-01, ASU No. 2016-13 and ASU No. 2017-12. Various areas of the ASC were impacted by the update. This standard follows the effective dates of the previously issued ASUs, unless an entity has already early adopted the previous ASUs, in which case the effective date will vary according to each specific ASU adoption. The Company adopted the amendments related to ASU Nos. 2016-01 and 2016-13 on January 1, 2020 under the modified retrospective transition method, with the exception of the amendments related to equity securities without readily determinable fair values for which an entity elects the measurement alternative, which have been adopted prospectively. Adoption of these amendments did not have a material impact on the Company’s condensed consolidated financial statements or related disclosures. Refer below for further discussion of ASU No. 2016-13. The amendments to ASU No. 2017-12 are not applicable to the Company.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. Subsequently, the FASB has issued the following standards related to ASU No. 2016-13: ASU No. 2019-11, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, ASU No. 2019-05, Financial Instruments—Credit Losses (Topic 326): Targeted Transition Relief; ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments; and ASU No. 2018-19, Codification Improvements to Topic 326, Financial Instruments—Credit Losses. ASU No. 2016-13 requires entities to measure all expected credit losses for most financial assets held at the reporting date based on an expected loss model, which includes historical experience, current conditions, and reasonable and supportable

forecasts. Entities will now use forward-looking information to better form their credit loss estimates. ASU No. 2016-13 also requires enhanced disclosures to help financial statement users better understand assumptions used in estimating expected credit losses. The Company adopted this ASU and the related amendments on January 1, 2020 under the modified retrospective transition method, which resulted in no cumulative-effect adjustment to retained earnings.