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Basis of Presentation and Summary of Significant Accounting Policies - Use of Estimates (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Accounting Policies [Abstract] |  |  |
Accumulated deficit | $ (2,216,425) |  | $ (2,112,835)
Cash and cash equivalents | 48,166 |  | 82,840
Marketable securities | 59,465 |  | $ 99,827
Liquid assets | 107,600 |  |
Net cash used in operating activities | $ (97,954) | $ (158,936) |

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