Summary of significant accounting policies - Potentially dilutive securities (Details) - shares	3 Months Ended	6 Months Ended
	Mar. 31, 2023	Jun. 30, 2024
Potentially dilutive securities
Total shares of common stock equivalents	612,225	2,998,161
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	558,141	734,131
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	25,972	41,130