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Component of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Net operating loss carry forwards $ 249,510 $ 212,074
Research tax credit carry forwards 29,463 26,285
Accruals and reserves 8,684 9,771
Capitalized research costs 4,457 6,553
Deferred revenue   908
Other 1,303 1,375
Total deferred tax assets 293,417 256,966
Less valuation allowance (293,145) (256,712)
Net deferred tax assets 272 254
Deferred tax liabilities:    
Fixed Assets (272) (254)
Total deferred tax liabilities $ (272) $ (254)