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Income Taxes - Schedule of Significant Components of Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Components Of Deferred Tax Assets And Liabilities [Abstract]    
Federal and state net operating loss carryforwards $ 91,267 $ 91,683
Tax credit carryforwards 52,243 45,885
Foreign net operating loss carryforwards 37,786 21,295
Stock-based compensation 11,159 9,281
Lease obligations 10,698 2,511
Reserves and accruals 5,353 6,072
Deferred revenue 13,323 16,454
Fixed assets 0 356
Other 284 450
Subtotal 222,113 193,987
Less: Valuation allowance (213,847) (193,987)
Net deferred tax assets 8,266 0
Fixed assets (8,266) 0
Other 0 0
Net deferred tax liabilities (8,266) 0
Total net deferred tax assets $ 0 $ 0