Stockholders' equity - Common Stock (Details) - shares	Jun. 30, 2023	Dec. 31, 2022
Common stock
Number of shares reserved for future issuance (in shares)	16,052,928	11,944,664
Stock options
Common stock
Number of shares reserved for future issuance (in shares)	12,359,185	10,051,283
Restricted stock units
Common stock
Number of shares reserved for future issuance (in shares)	3,671,153	1,870,791
Warrants
Common stock
Number of shares reserved for future issuance (in shares)	22,590	22,590