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Basic and Diluted Net Loss per Common Share (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Numerator:    
Net loss attributable to common stockholders $ (54,992) $ (43,691)
Denominator:    
Weighted average common shares outstanding - basic and diluted 142,770,629 125,178,517
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 64,854,000 16,431,000
Common stock options    
Denominator:    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 17,822,000 14,102,000
Convertible debt    
Denominator:    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 40,850,000  
Warrants    
Denominator:    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 3,110,000 1,850,000
Restricted stock units (RSUs)    
Denominator:    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 3,022,000 479,000
Vested restricted stock units, unissued    
Denominator:    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 50,000