Nature of the business (Details) $ in Thousands	Jun. 30, 2024 USD ($) item	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)
Nature of the business
Number of clinical assets | item	1
Number of preclinical assets | item	2
Accumulated deficit	$ (388,421)	$ (222,807)
Non-restricted cash and cash equivalents	165,332	98,679	$ 38,416
Marketable securities	$ 113,021	$ 39,463