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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)

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