Summary of significant accounting policies - Anti-dilutive (Details) - shares	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share, Diluted, Other Disclosures [Abstract]
Anti-dilutive securities	11,451,856	3,524,419
Stock options outstanding
Earnings Per Share, Diluted, Other Disclosures [Abstract]
Anti-dilutive securities	11,451,856	3,024,419
Common stock warrants
Earnings Per Share, Diluted, Other Disclosures [Abstract]
Anti-dilutive securities		500,000

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482662/260-10-50-1

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration