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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Capitalized research expense $ 50,143 $ 41,252
NOL carryforwards 235,624 212,768
Research and development and other tax credits 27,734 26,442
Deferred revenue 22 538
Stock-based compensation 3,683 3,945
Acquired intangibles 907 559
Investment in affiliated entity 1,406 1,569
Lease liability 2,822 3,247
Fixed assets 337 57
Other 6,808 11,062
Deferred tax assets, gross 329,486 301,439
Valuation allowance (327,493) (299,124)
Total deferred tax assets 1,993 2,315
Deferred tax liabilities:    
Acquired intangibles 0 (199)
Right of use asset (1,993) (2,148)
Total deferred tax liabilities (1,993) (2,347)
Net deferred tax liabilities $ 0 $ (32)