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INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 196,719 | $ 174,129
Research and development tax credit carryforwards | 54,336 | 44,264
Stock-based compensation | 5,983 | 7,695
Deferred revenue | 0 | 38,700
Capitalized research | 71,675 | 37,985
Fixed assets | 17,152 | 10,087
Intangible assets | 101 | 0
Lease liability | 8,559 | 10,074
Accruals and reserves | 2,409 | 1,603
Other | 259 | 283
Total deferred tax asset | 357,193 | 324,820
Valuation allowance | 351,430 | 301,840
Deferred tax assets | 5,763 | 22,980
Liabilities: |  |
Intangible assets | 0 | (13,512)
Operating lease right-of-use assets | (5,763) | (14,620)
Deferred tax liabilities | (5,763) | (28,132)
Total net deferred tax liabilities | $ 0 | $ (5,152)

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