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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Accrued expenses and reserves $ 3,978 $ 1,661
Share-based compensation 12,003 13,083
Accrued compensation 997 2,075
Net operating loss carryforwards 162,320 106,659
Property and equipment, textbooks and intangibles assets 0 3,745
Other items 3,438 2,951
Gross deferred tax assets 182,736 130,174
Valuation allowance (148,519) (125,844)
Total deferred tax assets 34,217 4,330
Deferred tax liabilities:    
Property and equipment, textbooks and intangibles assets (4,111) 0
Convertible senior notes (27,065) (46)
Other (4,661) (5,943)
Total deferred tax liabilities (35,837) (5,989)
Net deferred tax liability $ (1,620) $ (1,659)