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Basic and Diluted Net Loss per Common Share | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Basic and Diluted Net Loss per Common Share | Basic and Diluted Net Loss per Common Share The following table provides a reconciliation of the numerator and denominator used in computing basic and diluted net loss attributable to common stockholders per common share:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands, except per share amounts) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Numerator: |  |  |  |  |  |  |  |
Net loss attributable to common stockholders |  | $ | (64,011) |  |  | $ | (61,809) |  |  | $ | (205,451) |  |  | $ | (266,659) |
Denominator: |  |  |  |  |  |  |  |
Weighted average common shares outstanding — basic and diluted |  | 259,161,799 |  |  | 254,674,422 |  |  | 258,091,170 |  |  | 235,527,540 |
Dilutive common stock equivalents would include the dilutive effect of common stock options, convertible debt units, RSUs, and warrants for common stock equivalents. Potentially dilutive common stock equivalents were excluded from the diluted earnings per share denominator for all periods because of their anti-dilutive effect. The table below presents potential shares of common stock that were excluded from the computation as they were anti-dilutive using the treasury stock method:
|  | As of September 30,
(in thousands) |  | 2020 |  | 2019
Options to purchase common stock |  | 16,415 |  |  | 17,530 |
Convertible notes |  | 462 |  |  | 462 |
Outstanding warrants, convertible to common stock |  | 2,555 |  |  | 2,555 |
Unvested restricted stock units |  | 7,446 |  |  | 5,840 |
Total number of potentially issuable shares |  | 26,878 |  |  | 26,387 |

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