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Basic and Diluted Net Loss per Common Share (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Numerator:    
Net loss attributable to common stockholders $ (49,916) $ (54,992)
Denominator:    
Weighted average common shares outstanding - basic and diluted 175,977,700 142,770,629
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 63,767,000 64,854,000
Common stock options    
Denominator:    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 16,176,000 17,822,000
Convertible debt    
Denominator:    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 40,850,000 40,850,000
Warrants    
Denominator:    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 3,110,000 3,110,000
Restricted stock units (RSUs)    
Denominator:    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 3,541,000 3,022,000
Vested restricted stock units, unissued    
Denominator:    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 90,000 50,000