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Earnings per Share (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to common stockholders | $ (69,208) | $ (111,666) | $ (48,136) | $ (54,992) | $ (58,647) | $ (46,654) | $ (51,050) | $ (43,691) | $ (284,002) | $ (200,042) | $ (132,118)
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding - basic and diluted |  |  |  |  |  |  |  |  | 153,355,144 | 134,401,588 | 109,923,815
Antidilutive securities excluded from computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 61,766,000 | 60,232,000 | 13,558,000
Common stock options |  |  |  |  |  |  |  |  |  |  |
Denominator: |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 15,181,000 | 15,528,000 | 11,729,000
Convertible debt |  |  |  |  |  |  |  |  |  |  |
Denominator: |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 40,850,000 | 40,850,000 |
Warrants |  |  |  |  |  |  |  |  |  |  |
Denominator: |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 3,110,000 | 3,110,000 | 1,350,000
Restricted stock units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Denominator: |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 2,575,000 | 744,000 | 479,000
Vested restricted stock units, unissued |  |  |  |  |  |  |  |  |  |  |
Denominator: |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 50,000 |  |

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