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Basic and Diluted Net Loss per Common Share (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Numerator:                      
Net loss attributable to common stockholders $ (89,729) $ (61,809) $ (84,551) $ (120,299) $ (78,083) $ (159,163) $ (61,833) $ (49,916) $ (356,388) $ (348,995) $ (284,002)
Denominator:                      
Weighted-average common shares outstanding - basic and diluted (in shares)                 240,421,001 185,790,021 153,355,144
Antidilutive securities                      
Antidilutive securities excluded from computation of diluted earnings per share (in shares)                 25,719,000 63,120,000 61,766,000
Options to purchase common stock                      
Antidilutive securities                      
Antidilutive securities excluded from computation of diluted earnings per share (in shares)                 16,724,000 15,810,000 15,181,000
Convertible debt                      
Antidilutive securities                      
Antidilutive securities excluded from computation of diluted earnings per share (in shares)                 462,000 40,850,000 40,850,000
Outstanding warrants, convertible to common stock                      
Antidilutive securities                      
Antidilutive securities excluded from computation of diluted earnings per share (in shares)                 2,555,000 2,657,000 3,110,000
Unvested restricted stock units                      
Antidilutive securities                      
Antidilutive securities excluded from computation of diluted earnings per share (in shares)                 5,792,000 3,712,000 2,575,000
Vested restricted stock units, unissued                      
Antidilutive securities                      
Antidilutive securities excluded from computation of diluted earnings per share (in shares)                 186,000 91,000 50,000