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Income Taxes - Schedule of Differences Between Income Taxes Computed at the Federal Statutory Rate and the Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Expected income tax benefit at the federal statutory rate $ 12,955 $ 17,166 $ 15,761
State taxes net of federal benefit 5,155 5,150 916
Stock-based compensation 17,575 10,939 (2,001)
Difference in foreign tax rates 435 988 415
U.S. tax credits 1,763 1,717 1,609
Convertible debt and acquisition   11,573  
Federal rate change   (49,123)  
Transition tax   (1,063)  
GILTI inclusion (1,177)    
Meals & entertainment (1,411) (745) (612)
Change in valuation allowance (37,059) 13,988 (16,413)
Other (104) (265) (208)
Total income tax benefit (provision) $ (1,868) $ 10,325 $ (533)