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Income Taxes - Schedule of Significant Components of Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Components Of Deferred Tax Assets And Liabilities [Abstract]    
Federal and state net operating loss carryforwards $ 91,683 $ 71,256
Tax credit carryforwards 45,885 39,488
Foreign net operating loss carryforwards 21,295 15,052
Stock-based compensation 9,281 7,835
Lease obligations 2,511 2,737
Reserves and accruals 6,072 4,851
Deferred revenue 16,454 18,103
Fixed assets 356 0
Other 450 420
Subtotal 193,987 159,742
Less: Valuation allowance (193,987) (159,540)
Net deferred tax assets 0 202
Fixed assets 0 (181)
Other 0 (21)
Net deferred tax liabilities 0 (202)
Total net deferred tax assets $ 0 $ 0