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Income Taxes - Schedule of (Loss) Income Before Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
United States $ (69,769) $ (54,894) $ (47,112)
Foreign 7,809 4,855 2,083
Total $ (61,960) $ (50,039) $ (45,029)