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Components of Net Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Net operating loss carryforwards $ 533,448 $ 531,970
Research and development credits 79,455 80,488
Capitalized research   44
Milestone Rights 1,547 1,528
Accrued expenses 1,436 1,951
Loss on purchase commitment 23,864 22,167
Non-qualified stock option expense 3,766 3,128
Capitalized patent costs 5,273 4,964
Other 2,093 147
Lease liability 559 827
Interest expense limitation 2,460 1,167
Depreciation 20,735 21,132
Deferred Product Revenue & Costs 1,569 2,062
Total net deferred tax assets 676,205 671,575
Valuation allowance (675,463) (670,617)
Net deferred tax assets 742 958
Deferred tax liabilities:    
Right of use asset (510) (751)
Other prepaids (232) (207)
Total deferred tax liabilities $ (742) $ (958)