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Stockholders' equity - Common stock (Details) - shares | Sep. 30, 2022 | Dec. 31, 2021
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Common stock |  |
Number of shares reserved for future issuance (in shares) | 12,418,052 | 9,199,512
Share-based payments | Stock options |  |
Common stock |  |
Number of shares reserved for future issuance (in shares) | 10,524,780 | 8,342,429
Share-based payments | Restricted stock units |  |
Common stock |  |
Number of shares reserved for future issuance (in shares) | 1,870,682 | 817,609
Warrants |  |
Common stock |  |
Number of shares reserved for future issuance (in shares) | 22,590 | 39,474

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