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Net Loss per Share | 9 Months Ended
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Sep. 30, 2021
Net Loss per Share |
Net Loss per Share | 11. Net Loss per Share The following outstanding potentially dilutive common stock equivalents have been excluded from the calculation of diluted net loss per share attributable to common stockholders for the periods presented due to their antidilutive effect: ​
​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
​ |  | 2021 |  | 2020
Convertible preferred stock (as converted) |  | 15,906,537 |  | 12,528,612
Options issued and outstanding |  | 4,318,992 |  | 4,587,865
Warrants for common stock |  | 149,800 |  | 201,131
Total |  | 20,375,329 |  | 17,317,608
​ The basic and diluted net loss per share attributable to common stockholders has been prepared as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30, | ​
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 | ​
Net loss | ​ | $ | (3,110) | ​ | $ | (1,791) | ​ | $ | (4,377) | ​ | $ | (5,971) | ​
Cumulative preferred stock dividends | ​ |  | (1,859) | ​ |  | (1,064) | ​ |  | (4,326) | ​ |  | (3,170) | ​
Net loss attributable to common stockholders | ​ | $ | (4,969) | ​ | $ | (2,855) | ​ | $ | (8,703) | ​ | $ | (9,141) | ​
Weighted-average common shares outstanding - basic and diluted | ​ |  | 611,680 | ​ |  | 537,315 | ​ |  | 585,320 | ​ |  | 498,415 | ​
Total | ​ | $ | (8.12) | ​ | $ | (5.31) | ​ | $ | (14.87) | ​ | $ | (18.34) | ​
​

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