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Income Taxes - Schedule of Significant Components of Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Components Of Deferred Tax Assets And Liabilities [Abstract]    
Federal and state net operating loss carryforwards $ 71,256 $ 42,900
Tax credit carryforwards 39,488 29,846
Foreign net operating loss carryforwards 15,052 11,704
Stock-based compensation 7,835 11,231
Lease obligations 2,737 4,414
Reserves and accruals 4,851 5,465
Deferred revenue 18,103 22,909
Other 420 741
Subtotal 159,742 129,210
Less: Valuation allowance (159,540) (128,995)
Net deferred tax assets 202 215
Fixed assets (181) (122)
Other (21) (93)
Net deferred tax liabilities (202) (215)
Total net deferred tax assets $ 0 $ 0