Restructurings and impairment charges (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended					9 Months Ended		13 Months Ended
	Nov. 14, 2022	Mar. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2024	Mar. 06, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring charges								$ 2,109
Impairment of property and equipment		$ 3,400	$ 0		$ 3,400		$ 0	3,418	$ 0
PPE disposals				$ 1,800
Gain (loss) on property and equipment				200				47	$ (108)
General and administrative expenses
Restructuring Cost and Reserve [Line Items]
Gain (loss) on property and equipment				(100)
Research and development expenses
Restructuring Cost and Reserve [Line Items]
Gain (loss) on property and equipment				$ 300
November 2022 Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring number of positions eliminated, percentage	40.00%
Restructuring costs	$ 1,700
Restructuring charges						$ 1,400		327
March 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs											$ 1,800
Restructuring charges								1,782
March 2023 Restructuring Plan | Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring number of positions eliminated, percentage										70.00%
March 2023 Restructuring Plan | General and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges								600
March 2023 Restructuring Plan | Research and development expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges								$ 1,200