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Income Taxes - Summary of Domestic and Foreign Components of Loss Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Domestic $ (65,695) $ (54,568) $ (71,672)
Foreign (3,194)    
Loss before income taxes $ (68,889) $ (54,568) $ (71,672)