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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)

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