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Basic and Diluted Net Loss per Common Share (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator:        
Net loss attributable to common stockholders $ (111,666) $ (46,654) $ (214,794) $ (141,395)
Denominator:        
Weighted average common shares outstanding - basic and diluted 160,796,841 140,656,109 148,963,864 131,675,690
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     62,912,000 19,722,000
Common stock options        
Denominator:        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     16,212,000 15,773,000
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 3,110,000
Restricted stock units (RSUs)        
Denominator:        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     2,690,000 839,000
Vested restricted stock units, unissued        
Denominator:        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     50,000