Restructuring - Summary of future termination benefit payments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 356	$ 0	$ 5,107	$ 45
Research and development
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	356	0	3,750	0
General and administrative
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 0	$ 0	$ 1,357	$ 45