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Basic and Diluted Net Loss per Common Share (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Numerator:    
Net loss attributable to common stockholders $ (120,299) $ (49,916)
Denominator:    
Weighted-average common shares outstanding - basic and diluted (in shares) 213,519,287 175,977,700
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 32,101,000 63,767,000
Options to purchase common stock    
Denominator:    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 18,331,000 16,176,000
Convertible notes    
Denominator:    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 5,017,000 40,850,000
Outstanding warrants, convertible to common stock    
Denominator:    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 2,554,000 3,110,000
Unvested restricted stock units    
Denominator:    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 6,010,000 3,541,000
Vested restricted stock units, unissued    
Denominator:    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 189,000 90,000