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Component of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Net operating loss carry forwards $ 146,300 $ 249,510
Research tax credit carry forwards 29,658 29,463
Accruals and reserves 6,551 8,684
Capitalized research costs 1,422 4,457
Other 731 1,303
Total deferred tax assets 184,662 293,417
Less valuation allowance (184,388) (293,145)
Net deferred tax assets 274 272
Deferred tax liabilities:    
Fixed assets (274) (272)
Total deferred tax liabilities $ (274) $ (272)