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Net Loss Per Common Share (Details) - Class A common stock [Member] - shares
shares in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Net Loss Per Common Share (Details) [Line Items]    
Excluded shares of issued common stock subject to vesting 0.1 1.4
Shares of common stock issuable upon conversion of warrants 6.5 18.9
Share convertible anti-dilutive 0.5  
Paired Securities exchangeable   31.4