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Net loss per share
 9 Months Ended
Sep. 30, 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:

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Three Months Ended September 30, 

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Nine Months Ended September 30, 

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2021

    

2020

    

2021

    

2020

Numerator:

 

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Net loss

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$

(24,330)

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$

(21,403)

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$

(68,353)

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$

(49,496)

Denominator:

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Weighted average common shares outstanding, basic and diluted

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34,862,116

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34,002,769

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34,807,439

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30,381,671

Net loss per share, basic and diluted

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$

(0.70)

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$

(0.63)

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$

(1.96)

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$

(1.63)

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The Company excluded 42 shares and 53,679 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 September 30, 2021 and 2020, respectively, because those shares had not vested. The Company excluded 10,865 shares and 41,938 shares of restricted common stock, presented on a weighted average basis, from the calculations of basic net loss per share for the nine months ended September 30, 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:

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Three and nine months ended September 30, 

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2021

    

2020

Options to purchase common stock

 

4,032,052

 

3,158,642

Unvested restricted common stock

 

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48,501

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4,032,052

 

3,207,143

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