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Net Income (Loss) Per Share - Anti-dilutive Securities (Details) - shares
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Net Loss Per Share    
Anti-dilutive securities (in shares) 76,150,364 10,917,848
Stock options    
Net Loss Per Share    
Anti-dilutive securities (in shares) 16,701,139 9,673,902
Restricted stock units    
Net Loss Per Share    
Anti-dilutive securities (in shares) 681,511 1,243,946
Amazon warrant shares    
Net Loss Per Share    
Anti-dilutive securities (in shares) 58,767,714