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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Accrued expenses and reserves $ 6,365 $ 3,978
Share-based compensation 6,473 12,003
Accrued compensation 2,402 997
Net operating loss carryforwards 190,904 162,320
Other items 5,734 3,438
Gross deferred tax assets 211,878 182,736
Valuation allowance (151,825) (148,519)
Total deferred tax assets 60,053 34,217
Deferred tax liabilities:    
Property and equipment, textbooks and intangibles assets (4,066) (4,111)
Convertible senior notes (51,607) (27,065)
Other (5,890) (4,661)
Total deferred tax liabilities (61,563) (35,837)
Net deferred tax liability $ (1,510) $ (1,620)