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Summary of significant accounting policies - Potentially dilutive securities (Details) - shares | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Potentially dilutive securities |  |  |
Total shares of common stock equivalents | 549,235 | 249,293 | 188,552
Convertible preferred stock |  |  |
Potentially dilutive securities |  |  |
Total shares of common stock equivalents | 56,227 |  |
Options to purchase common stock |  |  |
Potentially dilutive securities |  |  |
Total shares of common stock equivalents | 480,274 | 229,308 | 188,552
Restricted stock units |  |  |
Potentially dilutive securities |  |  |
Total shares of common stock equivalents | 12,734 | 19,985 |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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