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Common stock and common stock warrants - Schedule of Outstanding Common Stock Warrants (Details) - Common Stock Warrants - $ / shares | Mar. 31, 2025 | Dec. 31, 2024
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Common stock and common stock warrants |  |
Shares of common stock issuable upon exercise of warrant (in shares) | 1,020,144 | 1,020,144
July 24, 2017 |  |
Common stock and common stock warrants |  |
Contractual term | 10 years | 10 years
Shares of common stock issuable upon exercise of warrant (in shares) | 15,035 | 15,035
Weighted average exercise price (in dollars per share) | $ 298.96 | $ 298.96
April 12, 2018 |  |
Common stock and common stock warrants |  |
Contractual term | 10 years | 10 years
Shares of common stock issuable upon exercise of warrant (in shares) | 30,000 | 30,000
Weighted average exercise price (in dollars per share) | $ 1.00 | $ 1.00
July 14, 2021 |  |
Common stock and common stock warrants |  |
Contractual term | 10 years | 10 years
Shares of common stock issuable upon exercise of warrant (in shares) | 975,109 | 975,109
Weighted average exercise price (in dollars per share) | $ 1.46 | $ 1.46

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 + Details
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- Definition Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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