Nature of the business (Details) $ in Thousands	Sep. 30, 2024 USD ($) item	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)
Nature of the business
Number of clinical assets | item	1
Number of preclinical assets | item	2
Accumulated deficit	$ (435,521)	$ (222,807)
Non-restricted cash and cash equivalents	155,568	98,679	$ 90,641
Marketable securities	$ 84,562	$ 39,463