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Summary of significant accounting policies - Potentially dilutive securities (Details) - shares | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025
Potentially dilutive securities |  |
Total shares of common stock equivalents | 49,757,258 | 3,058,804
Private Placement | Pre-funded Warrants |  |
Potentially dilutive securities |  |
Warrants to purchase of shares | 41,099,626 |
Convertible preferred stock (as converted) |  |
Potentially dilutive securities |  |
Total shares of common stock equivalents | 15,596 | 15,596
Employee Stock Option |  |
Potentially dilutive securities |  |
Total shares of common stock equivalents | 1,137,333 | 815,723
Warrants to purchase common stock |  |
Potentially dilutive securities |  |
Total shares of common stock equivalents | 48,538,891 | 2,194,788
Unvested restricted stock units |  |
Potentially dilutive securities |  |
Total shares of common stock equivalents | 65,438 | 32,697

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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 -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 + Details
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