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Net Income (Loss) Per Common Share (Details) - Class A common stock [Member] - shares
shares in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Net Income (Loss) Per Common Share (Details) [Line Items]    
Paired Securities exchangeable 0.5 31.4
Excluded shares of issued common stock subject to vesting   1.4
Shares of common stock issuable upon conversion of warrants   18.9