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Net Loss per Share | 12 Months Ended
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Dec. 31, 2021
Net Loss per Share |
Net Loss per Share | 14. Net Loss Per Share Basic and diluted net loss per share attributable to common stockholders was calculated as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Years ended December 31,
​ |  | 2020 |  | 2021
Numerator: | ​ | ​ | ​ | ​ | ​ | ​
Net loss | ​ | $ | (8,445) |  | $ | (18,887)
Dividend on convertible exchangeable preferred shares | ​ | ​ | (201) |  | ​ | (201)
Beneficial conversion feature of Series B preferred stock | ​ | ​ | (3,775) |  | ​ | —
Net loss attributable to common shareholders | ​ | $ | (12,421) |  | $ | (19,088)
Denominator: | ​ |  |  |  |  |
Weighted-average number of common shares used in loss per share – basic and diluted | ​ |  | 3,633,385 |  |  | 8,926,173
Loss per share – basic and diluted | ​ | $ | (3.42) |  | $ | (2.14)
​ Potential dilutive securities 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 attributable to common stockholders 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 attributable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect: ​
​ | ​ | ​ | ​ | ​
​ |  | December 31, | ​ | December 31,
​ |  | 2020 |  | 2021
Stock options |  | 602,683 |  | 1,099,356
6% convertible exchangeable preferred stock |  | 85 |  | 85
Series A preferred stock |  | 6,600 |  | 6,600
Series B preferred stock |  | 1,188,725 |  | 1,188,725
Common stock warrants |  | 4,143,379 |  | 3,234,379
Total shares excluded from calculation |  | 5,941,472 |  | 5,529,145
​

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