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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Accrued expenses and reserves $ 6,402 $ 6,365
Share-based compensation 8,979 6,473
Accrued compensation 0 2,402
Net operating loss carryforwards 188,329 190,904
Property and equipment, textbooks and intangibles assets 1,849 0
Convertible senior notes 32,254 0
Other items 7,221 5,734
Gross deferred tax assets 245,034 211,878
Valuation allowance (238,317) (151,825)
Total deferred tax assets 6,717 60,053
Deferred tax liabilities:    
Property and equipment, textbooks and intangibles assets 0 (4,066)
Convertible senior notes 0 (51,607)
Other (7,878) (5,890)
Total deferred tax liabilities (7,878) (61,563)
Net deferred tax liability $ (1,161) $ (1,510)