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Common stock and common stock warrants - Schedule of Outstanding Common Stock Warrants (Details) - $ / shares	Jun. 30, 2026	May 29, 2026	Dec. 31, 2025
Common Stock Warrants
Common stock and common stock warrants
Shares of common stock issuable upon exercise of warrant (in shares)	12,259,421		1,199,248
Common Stock Warrants | 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)	10,026		15,035
Weighted average exercise price (in dollars per share)	$ 298.96		$ 298.96
Common Stock Warrants | 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
Common Stock Warrants | 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)	346,077		975,109
Weighted average exercise price (in dollars per share)	$ 3.99		$ 1.46
Common Stock Warrants | August 8, 2025
Common stock and common stock warrants
Contractual term	10 years		10 years
Shares of common stock issuable upon exercise of warrant (in shares)	179,104		179,104
Weighted average exercise price (in dollars per share)	$ 3.35		$ 3.35
Pre-Funded Warrants | May 20 2026
Common stock and common stock warrants
Shares of common stock issuable upon exercise of warrant (in shares)	1,463,000
Weighted average exercise price (in dollars per share)	$ 0.01
Series A Common Stock Warrants
Common stock and common stock warrants
Contractual term		1 year
Series A Common Stock Warrants | May 20 2026
Common stock and common stock warrants
Contractual term	1 year
Shares of common stock issuable upon exercise of warrant (in shares)	5,044,000
Weighted average exercise price (in dollars per share)	$ 1.96
Series A Common Stock Warrants | May 29 2026
Common stock and common stock warrants
Contractual term	1 year
Shares of common stock issuable upon exercise of warrant (in shares)	71,607
Weighted average exercise price (in dollars per share)	$ 1.96
Series B Common Stock Warrants
Common stock and common stock warrants
Contractual term		5 years
Series B Common Stock Warrants | May 20 2026
Common stock and common stock warrants
Contractual term	5 years
Shares of common stock issuable upon exercise of warrant (in shares)	5,044,000
Weighted average exercise price (in dollars per share)	$ 2.34
Series B Common Stock Warrants | May 29 2026
Common stock and common stock warrants
Contractual term	5 years
Shares of common stock issuable upon exercise of warrant (in shares)	71,607
Weighted average exercise price (in dollars per share)	$ 2.34

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Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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