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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Capitalized research expense $ 54,204 $ 50,143
NOL carryforwards 250,336 235,624
Research and development and other tax credits 31,250 27,734
Deferred revenue 0 22
Stock-based compensation 3,060 3,683
Acquired intangibles 774 907
Investment in affiliated entity 1,651 1,406
Lease liability 2,492 2,822
Fixed assets 441 337
Other 6,720 6,808
Deferred tax assets, gross 350,928 329,486
Valuation allowance (349,224) (327,493)
Total deferred tax assets 1,704 1,993
Deferred tax liabilities:    
Right of use asset (1,704) (1,993)
Total deferred tax liabilities (1,704) (1,993)
Net deferred tax liabilities $ 0 $ 0