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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax assets: |  |
Accrued expenses and reserves | $ 7,990 | $ 6,402
Share-based compensation | 10,078 | 8,979
Net operating loss and credits carryforwards | 147,465 | 188,329
Property and equipment, textbooks and intangibles assets | 0 | 1,849
Convertible senior notes | 16,648 | 32,254
Research and experimental expenditures capitalization | 37,719 | 0
Other items | 6,777 | 7,221
Gross deferred tax assets | 226,677 | 245,034
Valuation allowance | (36,122) | (238,317)
Total deferred tax assets | 190,555 | 6,717
Deferred tax liabilities: |  |
Property and equipment, textbooks and intangibles assets | (14,766) | 0
Other | (10,070) | (7,878)
Total deferred tax liabilities | (24,836) | (7,878)
Net deferred tax asset (liability) | $ 165,719 |
Net deferred tax asset (liability) |  | $ (1,161)

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