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Component of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Net operating loss carry forwards $ 212,074 $ 178,008
Research tax credit carry forwards 26,285 22,914
Accruals and reserves 9,771 9,053
Capitalized research costs 6,553 8,601
Deferred revenue 908 654
Other 1,375 1,531
Total deferred tax assets 256,966 220,761
Less valuation allowance (256,712) (220,544)
Net deferred tax assets 254 217
Deferred tax liabilities:    
Fixed Assets (254) (217)
Total deferred tax liabilities $ (254) $ (217)