Annual report pursuant to Section 13 and 15(d)

Income Taxes - Losses Before Provision for Income Taxes (Detail)

v3.20.4
Income Taxes - Losses Before Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
United States $ (306,758) $ (291,049) $ (230,765)
Foreign 153 85 22
Loss before provision for income taxes $ (306,605) $ (290,964) $ (230,743)