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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