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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets: |  |
Accrued expenses and reserves | $ 10,442 | $ 7,990
Share-based compensation | 11,200 | 10,078
Net operating loss and credits carryforwards | 92,302 | 147,465
Convertible senior notes | 5,566 | 16,648
Research and experimental expenditures capitalization | 69,362 | 37,719
Other items | 6,133 | 6,777
Gross deferred tax assets | 195,005 | 226,677
Valuation allowance | (40,162) | (36,122)
Total deferred tax assets | 154,843 | 190,555
Deferred tax liabilities: |  |
Property and equipment, textbooks and intangibles assets | (2,621) | (14,766)
Other | (13,134) | (10,070)
Total deferred tax liabilities | (15,755) | (24,836)
Net deferred tax asset (liability) | $ 139,088 | $ 165,719

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