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Basic and Diluted Net Loss per Common Share (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Numerator:      
Net loss attributable to common stockholders $ (250,460) $ (276,852) $ (356,388)
Denominator:      
Weighted-average common shares outstanding - basic (in shares) 271,421,986 258,867,380 240,421,001
Weighted-average common shares outstanding - diluted (in shares) 271,421,986 258,867,380 240,421,001
Antidilutive securities      
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 22,072,000 24,129,000 25,533,000
Options to purchase common stock      
Antidilutive securities      
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 14,731,000 14,032,000 16,724,000
Unvested restricted stock units      
Antidilutive securities      
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 7,341,000 7,080,000 5,792,000
Outstanding warrants, convertible to common stock      
Antidilutive securities      
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 0 2,555,000 2,555,000
Convertible notes      
Antidilutive securities      
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 0 462,000 462,000