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Income Taxes - Schedule of Significant Components of Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Components Of Deferred Tax Assets And Liabilities [Abstract]    
Federal and state net operating loss carryforwards $ 42,900 $ 53,393
Tax credit carryforwards 29,846 26,620
Foreign net operating loss carryforwards 11,704 8,421
Stock-based compensation 11,231 8,512
Lease obligations 4,414 4,335
Reserves and accruals 5,465 4,891
Deferred revenue 22,909 10,484
Other 741 915
Subtotal 129,210 117,571
Less: Valuation allowance (128,995) (116,718)
Net deferred tax assets 215 853
Fixed assets (122) (853)
Other (93) 0
Net deferred tax liabilities (215) (853)
Total net deferred tax assets $ 0 $ 0