Net Loss Per Share Attributable to Common Stockholders - Summary of Outstanding Shares of Potentially Dilutive Securities Excluded from Computation of Diluted Net Loss Per Share (Parenthetical) (Details) - shares shares in Millions	Dec. 31, 2021	Dec. 31, 2020
PSUs
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Unvested share outstanding	11	10