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Basic and Diluted Net Loss per Common Share (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to common stockholders | $ (78,083) | $ (159,163) | $ (61,833) | $ (49,916) | $ (69,208) | $ (111,666) | $ (48,136) | $ (54,992) | $ (348,995) | $ (284,002) | $ (200,042)
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding - basic and diluted (in shares) |  |  |  |  |  |  |  |  | 185,790,021 | 153,355,144 | 134,401,588
Antidilutive securities |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 63,120,000 | 61,766,000 | 60,232,000
Options to purchase common stock |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 15,810,000 | 15,181,000 | 15,528,000
Convertible debt |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 40,850,000 | 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) |  |  |  |  |  |  |  |  | 2,657,000 | 3,110,000 | 3,110,000
Unvested restricted stock units |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 3,712,000 | 2,575,000 | 744,000
Vested restricted stock units, unissued |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 91,000 | 50,000 | 0

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