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Basic and Diluted Net Loss per Common Share (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator:        
Net loss attributable to common stockholders $ (48,136) $ (51,050) $ (103,129) $ (94,741)
Denominator:        
Weighted average common shares outstanding - basic and diluted 143,000,718 129,122,175 142,886,614 127,160,943
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     64,111,000 17,703,000
Common stock options        
Denominator:        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     17,275,000 14,271,000
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)     2,826,000 322,000
Vested restricted stock units, unissued        
Denominator:        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     50,000