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Component of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Net operating loss carry forwards $ 224,161 $ 207,385
Research tax credit carry forwards 28,578 27,883
Accruals and reserves 17,264 17,312
Capitalized research costs   256
Other 3,250 2,437
Total deferred tax assets 273,253 255,273
Less valuation allowance (266,100) (247,092)
Net deferred tax assets 7,153 8,181
Deferred tax liabilities:    
Fixed assets (275) (275)
Operating lease right-of-use assets (6,878) (7,906)
Total deferred tax liabilities $ (7,153) $ (8,181)