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Income Taxes - Summary of Income or (Loss) Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
United States $ (21,753) $ (13,707) $ (719)
Foreign (19,609) 0 0
Loss before income taxes $ (41,362) $ (13,707) $ (719)