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Summary of significant accounting policies - Anti-dilutive (Details) - shares | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Earnings Per Share, Diluted, Other Disclosures [Abstract] |  |
Anti-dilutive securities | 3,540,163 | 3,835,756
Stock options |  |
Earnings Per Share, Diluted, Other Disclosures [Abstract] |  |
Anti-dilutive securities | 3,038,080 | 2,532,644
Common stock warrants |  |
Earnings Per Share, Diluted, Other Disclosures [Abstract] |  |
Anti-dilutive securities | 500,000 | 1,303,112
Unvested restricted stock awards |  |
Earnings Per Share, Diluted, Other Disclosures [Abstract] |  |
Anti-dilutive securities | 2,083 |

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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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