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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

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