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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 983,652 | $ 959,864
Accruals and reserves | 52,750 | 47,986
Stock-based compensation | 29,572 | 37,981
Research and development credits | 177,109 | 159,604
Intangibles | 135,564 | 135,500
Capitalized research and development expenses | 231,819 | 219,176
Lease liability | 44,682 | 60,795
Unrealized losses on marketable securities | 0 | 32,108
Investments and other basis differences | 51,368 | 11,952
Other | 31,852 | 24,878
Gross deferred tax assets | 1,738,368 | 1,689,844
Valuation allowance | (1,533,933) | (1,357,300)
Net deferred tax assets | 204,435 | 332,544
Deferred tax liabilities: |  |
Capitalized software | (36,109) | (36,552)
Prepaid expenses | (1,073) | (1,587)
Acquired intangibles | (81,415) | (202,778)
Right-of-use asset | (19,964) | (35,734)
Deferred commissions | (50,703) | (59,675)
Net deferred tax asset | $ 15,171 |
Net deferred tax liability |  | $ (3,782)

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