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Income Taxes Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Net operating loss and capital loss carryforwards $ 25,410 $ 24,971
Reserves and accruals 24,769 12,547
Stock-based compensation 8,571 10,074
Deferred revenue 14,285 10,811
Net translation losses 1,158 1,928
Credit carryforwards 115 792
Total deferred tax assets, gross 74,308 61,123
Deferred tax liabilities:    
Depreciation and amortization 8,320 7,522
Unremitted foreign earnings 612 3,305
Prepaid expenses 902 751
Total deferred tax liabilities, gross 9,834 11,578
Net deferred tax assets before valuation allowance 64,474 49,545
Valuation allowance (251) (278)
Net deferred tax assets $ 64,223 $ 49,267