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Components of Net Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:    
Net operating loss carryforwards $ 542,537 $ 542,800
Research and development credits 78,804 78,804
Capitalized research costs 4,369  
Milestone Rights 1,331 1,440
Accrued expenses 2,675 2,591
Loss on purchase commitment 23,117 24,845
Non-qualified stock option expense 7,686 5,684
Capitalized patent costs 8,058 7,518
Other 3,204 2,568
Lease liability 1,624 588
Interest expense limitation 10,991 5,696
Depreciation 22,157 22,983
Deferred Product Revenue & Costs 370 404
Total net deferred tax assets 706,923 695,921
Valuation allowance (705,034) (695,094)
Net deferred tax assets 1,889 827
Deferred tax liabilities:    
Right of use asset (1,640) (555)
Other prepaids (249) (272)
Total deferred tax liabilities $ (1,889) $ (827)