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Basic and Diluted Net Loss per Common Share (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator:        
Net loss attributable to common stockholders $ (159,163) $ (111,666) $ (270,914) $ (214,794)
Denominator:        
Weighted-average common shares outstanding - basic and diluted (in shares) 189,162,841 160,796,841 184,606,790 148,963,864
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     63,014,000 62,912,000
Options to purchase common stock        
Denominator:        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     15,769,000 16,212,000
Convertible notes        
Denominator:        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     40,850,000 40,850,000
Outstanding warrants, convertible to common stock        
Denominator:        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     2,657,000 3,110,000
Unvested restricted stock units        
Denominator:        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     3,635,000 2,690,000
Vested restricted stock units, unissued        
Denominator:        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     103,000 50,000