Leases - Lease expense (Details) - Office and laboratory space - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Total lease expense	$ 325	$ 241
General and administrative
Lessee, Lease, Description [Line Items]
Total lease expense	161	78
Research and development
Lessee, Lease, Description [Line Items]
Short-term lease cost	200	100
Total lease expense	$ 164	$ 163