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Net Loss per Share Attributable to Common Stockholders | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Net Loss per Share Attributable to Common Stockholders | 13. Net loss per share attributable to common stockholders As noted above, for periods in which the Company reports a net loss attributable to common stockholders, potentially dilutive securities have been excluded from the computation of diluted net loss per share as their effects would be anti-dilutive. Therefore, the weighted average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to common stockholders is the same. The Company excluded the following potential common shares, presented based on amounts outstanding at period end, from the computation of diluted net loss per share attributable to common stockholders because including them would have had an anti-dilutive effect:
|  | As of June 30, |
|  | 2021 |  |  | 2020 |
Unvested restricted stock |  |  | 1,290,661 |  |  |  | 1,880,070 |
Outstanding options to purchase common stock |  |  | 5,934,744 |  |  |  | 5,646,046 |
Total |  |  | 7,225,405 |  |  |  | 7,526,116 |
The following table summarizes the computation of basic and diluted net loss per share attributable to common stockholders of the Company (in thousands except share and per share amounts):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to common stockholders |  | $ | (76,253 | ) |  | $ | (34,218 | ) |  | $ | (277,813 | ) |  | $ | (65,953 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares, basic and diluted |  |  | 62,210,239 |  |  |  | 49,430,138 |  |  |  | 61,215,705 |  |  |  | 40,077,788 |
Net loss per common share attributable to common stockholders, basic and diluted |  | $ | (1.23 | ) |  | $ | (0.69 | ) |  | $ | (4.54 | ) |  | $ | (1.65 | )

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