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Income Taxes - Summary of Loss Before Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
U.S. loss before taxes $ (223,519) $ (159,089)
Foreign loss before taxes (2,514) (1,174)
Loss before income taxes and noncontrolling interest $ (226,033) $ (160,263)