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Net loss per share | 3 Months Ended
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Mar. 31, 2021
Net loss per share |
Net loss per share | 10. Net loss per share Basic and diluted net loss per share attributable to common stockholders was calculated as follows:
|  | Three Months Ended March 31,
|  | 2021 |  | 2020
Numerator: |  |  |  |  |  |
Net loss |  | $ | (15,090) |  | $ | (11,886)
Denominator: |  |  |  |  |  |
Weighted average common shares outstanding, basic and diluted |  |  | 34,744,275 |  |  | 28,499,475
Net loss per share, basic and diluted |  | $ | (0.43) |  | $ | (0.42)
The Company excluded 9,761 shares and 77,223 shares of restricted common stock, presented on a weighted average basis, from the calculations of basic net loss per share for the three months ended March 31, 2021 and 2020, respectively, because those shares had not vested. The Company’s potentially dilutive securities, which include stock options and unvested restricted common stock, have been excluded from the computation of diluted net loss per share as the effect would be to reduce the net loss per share. Therefore, the weighted average number of common shares outstanding used to calculate both basic and diluted net loss per share is the same. The Company excluded the following potential common shares, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share for the periods indicated because including them would have had an anti-dilutive effect:
|  | Three Months Ended March 31,
|  | 2021 |  | 2020
Options to purchase common stock |  | 3,877,705 |  | 3,095,450
Unvested restricted common stock |  | 18,725 |  | 93,532
|  | 3,896,430 |  | 3,188,982

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