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Basic and Diluted Net Loss per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:        
Net loss attributable to common stockholders $ (50,294) $ (64,011) $ (167,183) $ (205,451)
Denominator:        
Weighted average common shares outstanding - basic (in shares) 267,464,637 259,161,799 266,085,788 258,091,170
Weighted average number of shares outstanding - diluted (in shares) 267,464,637 259,161,799 266,085,788 258,091,170
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     22,338,000 26,878,000
Private Placement        
Denominator:        
Warrants exercise price (in dollars per share) $ 0.01   $ 0.01  
Options to purchase common stock        
Denominator:        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     14,798,000 16,415,000
Convertible notes        
Denominator:        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     0 462,000
Outstanding warrants, convertible to common stock        
Denominator:        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     0 2,555,000
Unvested restricted stock units        
Denominator:        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     7,540,000 7,446,000