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Component of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Net operating loss carry forwards $ 207,385 $ 178,730
Research tax credit carry forwards 27,883 34,064
Accruals and reserves 17,312 10,137
Capitalized research costs 256 943
Other 2,437 1,147
Total deferred tax assets 255,273 225,021
Less valuation allowance (247,092) (224,746)
Net deferred tax assets 8,181 275
Deferred tax liabilities:    
Fixed assets (275) (275)
Operating lease right-of-use assets (7,906)  
Total deferred tax liabilities $ (8,181) $ (275)