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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
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

X

- 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

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+ References

No definition available.

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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

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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

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