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Basic and Diluted Net Loss per Common Share (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator:        
Net loss attributable to common stockholders $ (64,011) $ (61,809) $ (205,451) $ (266,659)
Denominator:        
Weighted-average common shares outstanding - basic and diluted (in shares) 259,161,799 254,674,422 258,091,170 235,527,540
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     26,878,000 26,387,000
Options to purchase common stock        
Denominator:        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     16,415,000 17,530,000
Convertible notes        
Denominator:        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     462,000 462,000
Outstanding warrants, convertible to common stock        
Denominator:        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     2,555,000 2,555,000
Unvested restricted stock units        
Denominator:        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     7,446,000 5,840,000