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INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 211,585 | $ 196,719
Research and development tax credit carryforwards | 58,409 | 54,336
Stock-based compensation | 3,998 | 5,983
Deferred revenue | 0 | 0
Capitalized research | 74,354 | 71,675
Fixed assets | 15,648 | 17,152
Intangible assets | 31 | 101
Lease liability | 6,666 | 8,559
Accruals and reserves | 331 | 2,409
Other | 235 | 259
Total deferred tax asset | 371,257 | 357,193
Valuation allowance | 367,578 | 351,430
Deferred tax assets | 3,679 | 5,763
Liabilities: |  |
Intangible assets | 0 | 0
Operating lease right-of-use assets | (3,679) | (5,763)
Deferred tax liabilities | (3,679) | (5,763)
Total net deferred tax liabilities | $ 0 | $ 0

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