Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Net Loss per Share (Details)

Net Loss per Share (Details) - shares
shares in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]      
Anti-dilutive shares, excluded from computation of diluted net loss per share 4.8 4.9 4.3