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Income Taxes - Schedule of Significant Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Components Of Deferred Tax Assets And Liabilities [Abstract]    
Federal and state net operating loss carryforwards $ 53,393 $ 44,748
Tax credit carryforwards 26,620 24,395
Foreign net operating loss carryforwards 8,421 6,485
Stock-based compensation 8,512 5,836
Lease obligations 4,335 5,204
Reserves and accruals 4,891 5,075
Deferred revenue 10,484 3,304
Other 915 950
Subtotal 117,571 95,997
Less: Valuation allowance (116,718) (94,731)
Net deferred tax assets 853 1,266
Fixed assets (853) (1,266)
Net deferred tax liabilities (853) (1,266)
Total net deferred tax assets $ 0 $ 0