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Earnings per Share (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator:      
Net loss attributable to common stockholders $ (200,042) $ (132,118) $ (68,926)
Denominator:      
Weighted average common shares outstanding - basic and diluted 134,401,588 109,923,815 74,444,157
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 60,232,000 13,558,000 12,576,000
Common stock options      
Denominator:      
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 15,528,000 11,729,000 10,021,000
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 1,350,000 1,600,000
Restricted stock units (RSUs)      
Denominator:      
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 744,000 479,000 955,000