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Components of Net Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Net operating loss carryforwards $ 531,970 $ 524,377
Research and development credits 80,488 81,583
Capitalized research 44 557
Milestone Rights 1,528 3,521
Accrued expenses 1,951 1,156
Loss on purchase commitment 22,167 23,194
Non-qualified stock option expense 3,128 2,551
Capitalized patent costs 4,964 5,090
Other 147 669
Lease liability 827  
Interest expense limitation 1,167  
Depreciation 21,132 22,560
Deferred Product Revenue & Costs 2,062 107
Total net deferred tax assets 671,575 665,365
Valuation allowance (670,617) $ (665,365)
Net deferred tax assets 958  
Deferred tax liabilities:    
Right of use asset (751)  
Other prepaids (207)  
Total deferred tax liabilities $ (958)