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Basic and Diluted Net Loss per Common Share (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to common stockholders | $ (71,401) | $ (64,011) | $ (52,492) | $ (88,948) | $ (89,729) | $ (61,809) | $ (84,551) | $ (120,299) | $ (276,852) | $ (356,388) | $ (348,995)
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding - basic and diluted (in shares) |  |  |  |  |  |  |  |  | 258,867,380 | 240,421,001 | 185,790,021
Antidilutive securities |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 24,129,000 | 25,533,000 | 63,029,000
Options to purchase common stock |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 14,032,000 | 16,724,000 | 15,810,000
Convertible notes |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 462,000 | 462,000 | 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 | 2,555,000 | 2,657,000
Unvested restricted stock units |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 7,080,000 | 5,792,000 | 3,712,000

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