Summary of significant accounting policies - Potentially dilutive securities (Details) - shares	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Potentially dilutive securities
Total shares of common stock equivalents	2,993,473	634,623
March 2024 Private Placement | Pre-funded Warrants
Potentially dilutive securities
Warrants to purchase of shares	507,076
Convertible preferred stock (as converted)
Potentially dilutive securities
Total shares of common stock equivalents	28,112	28,112
Employee Stock Option
Potentially dilutive securities
Total shares of common stock equivalents	734,131	582,641
Warrants to purchase common stock
Potentially dilutive securities
Total shares of common stock equivalents	2,194,788
Unvested restricted stock units
Potentially dilutive securities
Total shares of common stock equivalents	36,442	23,870