Income Taxes	9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s income tax provisions for all periods consist of federal, state and foreign income taxes. The tax provisions for the three and nine months ended September 30, 2018 and 2017 were based on estimated full-year effective tax rates, including the mix of income for the period between higher-taxed and lower-taxed jurisdictions, after giving effect to significant items related specifically to the interim periods, and loss-making entities for which it is not more likely than not that a tax benefit will be realized. The Company’s effective tax rate was approximately 4% and 6% for the three months ended September 30, 2018 and 2017, respectively. The Company’s effective tax rate was approximately 11% and 3% for the nine months ended September 30, 2018 and 2017, respectively. A one-time tax benefit of approximately $3.0 million related to an asset acquisition of certain third-party technologies is included in the Company’s income tax benefit for the nine months ended September 30, 2018. This benefit relates to the reversal of the Company’s tax valuation allowance that was no longer needed as a result of establishing a net deferred tax liability. Excluding the one-time tax benefit, the Company’s tax benefit of $0.4 million and $2.2 million for the three and nine months ended September 30, 2018, respectively, related to losses generated by operations and the amortization of acquired intangibles in the Short Course Segment that are expected to be realized through future reversing taxable temporary differences. The Company expects to continue to recognize a tax benefit in the future for the Short Course Segment to the extent that this segment continues to generate pre-tax losses while carrying deferred tax liabilities that are in excess of deferred tax assets. To date, the Company has not been required to pay U.S. federal income taxes because of current and accumulated net operating losses. On December 22, 2017, Staff Accounting Bulletin No. 118 (“SAB 118”) was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Tax Cuts and Jobs Act of 2017 (“Tax Act”). As of September 30, 2018, the Company finalized its assessment of the Tax Act, including its determination that no transitional tax is required.

Income Taxes

The Company’s income tax provisions for all periods consist of federal, state and foreign income taxes. The tax provisions for the three and nine months ended September 30, 2018 and 2017 were based on estimated full-year effective tax rates, including the mix of income for the period between higher-taxed and lower-taxed jurisdictions, after giving effect to significant items related specifically to the interim periods, and loss-making entities for which it is not more likely than not that a tax benefit will be realized.

The Company’s effective tax rate was approximately 4% and 6% for the three months ended September 30, 2018 and 2017, respectively. The Company’s effective tax rate was approximately 11% and 3% for the nine months ended September 30, 2018 and 2017, respectively. A one-time tax benefit of approximately $3.0 million related to an asset acquisition of certain third-party technologies is included in the Company’s income tax benefit for the nine months ended September 30, 2018. This benefit relates to the reversal of the Company’s tax valuation allowance that was no longer needed as a result of establishing a net deferred tax liability. Excluding the one-time tax benefit, the Company’s tax benefit of $0.4 million and $2.2 million for the three and nine months ended September 30, 2018, respectively, related to losses generated by operations and the amortization of acquired intangibles in the Short Course Segment that are expected to be realized through future reversing taxable temporary differences. The Company expects to continue to recognize a tax benefit in the future for the Short Course Segment to the extent that this segment continues to generate pre-tax losses while carrying deferred tax liabilities that are in excess of deferred tax assets. To date, the Company has not been required to pay U.S. federal income taxes because of current and accumulated net operating losses.

On December 22, 2017, Staff Accounting Bulletin No. 118 (“SAB 118”) was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Tax Cuts and Jobs Act of 2017 (“Tax Act”). As of September 30, 2018, the Company finalized its assessment of the Tax Act, including its determination that no transitional tax is required.