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Basic and Diluted Net Loss per Common Share (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator:            
Net loss attributable to common stockholders $ (84,551) $ (120,299) $ (61,833) $ (49,916) $ (204,850) $ (111,751)
Denominator:            
Weighted-average common shares outstanding - basic and diluted (in shares) 238,089,824   188,621,423   225,848,013 182,303,128
Antidilutive securities excluded from computation of diluted earnings per share (in shares)         26,978,000 63,043,000
Options to purchase common stock            
Denominator:            
Antidilutive securities excluded from computation of diluted earnings per share (in shares)         17,849,000 15,869,000
Convertible notes            
Denominator:            
Antidilutive securities excluded from computation of diluted earnings per share (in shares)         462,000 40,850,000
Outstanding warrants, convertible to common stock            
Denominator:            
Antidilutive securities excluded from computation of diluted earnings per share (in shares)         2,555,000 2,657,000
Unvested restricted stock units            
Denominator:            
Antidilutive securities excluded from computation of diluted earnings per share (in shares)         5,885,000 3,556,000
Vested restricted stock units, unissued            
Denominator:            
Antidilutive securities excluded from computation of diluted earnings per share (in shares)         227,000 111,000