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Net Loss Per Share Attributable to Common Stockholders | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Net Loss Per Share Attributable to Common Stockholders | 10. Net Loss Per Share Attributable to Common Stockholders Basic and diluted net loss per common share is calculated as follows (in thousands except share and per share amounts):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Net loss |  | $ | (27,531 | ) |  | $ | (37,037 | )
Cumulative dividends on convertible preferred stock |  |  | (7,189 | ) |  |  | (7,055 | )
Net loss attributable to common stockholders |  | $ | (34,720 | ) |  | $ | (44,092 | )
Net loss per common share—basic and diluted |  | $ | (5.25 | ) |  | $ | (33.41 | )
Weighted-average number of shares used in computing net loss per common share—basic and diluted |  |  | 6,618,445 |  |  |  | 1,319,912 |
The following outstanding potentially dilutive shares have been excluded from the calculation of diluted net loss per share due to their anti-dilutive effect:
|  | As of December 31, |
|  | 2020 |  |  | 2019 |
Convertible preferred stock |  |  | — |  |  |  | 117,809,883 |
Stock options to purchase common stock |  |  | 2,756,102 |  |  |  | 2,117,106 |
Restricted stock awards |  |  | 80,000 |  |  |  | — |
Warrants to purchase common stock |  |  | 27,759 |  |  |  | 27,759 |
Under the Series C Financing, up to 17,014,902 shares of convertible preferred stock could have been contingently issued upon achievement of certain development milestones. However, in September 2020, the board of directors and the Series C investors amended the Series C stock purchase agreement such that the Preferred Stock Tranche Obligation was no longer exercisable and expired upon the effectiveness of the Company’s IPO registration statement.

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