Restructuring - Summary of future termination benefit payments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 0	$ 5,890	$ 45	$ 5,890
General and administrative
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	0	3,180	45	3,180
Research and development
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 0	$ 2,710	$ 0	$ 2,710