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Basic and Diluted Net Loss per Common Share (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
USD ($)
shares
Mar. 31, 2021
USD ($)
shares
Mar. 31, 2022
$ / shares
Numerator:      
Net loss attributable to common stockholders | $ $ (85,260) $ (65,664)  
Denominator:      
Weighted average common shares outstanding - basic (in shares) 288,481,741 264,369,317  
Weighted average number of shares outstanding - diluted (in shares) 288,481,741 264,369,317  
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 29,655,000 23,008,000  
Private Placement      
Denominator:      
Warrants exercise price (in dollars per share) | $ / shares     $ 0.01
Options to purchase common stock      
Denominator:      
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 19,304,000 15,084,000  
Unvested restricted stock units      
Denominator:      
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 10,351,000 7,466,000  
Convertible notes      
Denominator:      
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 0 458,000