Income Taxes - Summary of Loss Before Provision (benefit) for Income Taxes (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Schedule of Income Loss Before Provision For Income Taxes [Line Items] | |||
| Loss before provision (benefit) for income taxes | $ (1,179,027) | $ (567,271) | $ (570,925) |
| United States [Member] | |||
| Schedule of Income Loss Before Provision For Income Taxes [Line Items] | |||
| Loss before provision (benefit) for income taxes | (1,203,682) | (580,362) | (558,974) |
| Foreign [Member] | |||
| Schedule of Income Loss Before Provision For Income Taxes [Line Items] | |||
| Loss before provision (benefit) for income taxes | $ 24,655 | $ 13,091 | $ (11,951) |