Restructurings and impairment charges (Details) - USD ($) $ in Thousands		3 Months Ended			13 Months Ended
	Nov. 14, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Mar. 31, 2024	Mar. 06, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 1,967
Amounts Paid		(834)
Accrued at period end		2,174	$ 1,041
Impairment of property and equipment		3,418		$ 0
November 2022 Reductions
Restructuring Cost and Reserve [Line Items]
Restructing number of positions eliminated, percentage	40.00%
Restructuring costs		1,700
Restructuring charges		327	1,400
Amounts Paid		(490)
Accrued at period end		878	1,041
March 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs						$ 1,800
Restructuring and Related Cost, Expected Cost Remaining		200
Restructuring charges		1,640
Amounts Paid		(344)
Accrued at period end		1,296	$ 0
March 2023 Restructuring Plan | Forecast
Restructuring Cost and Reserve [Line Items]
Restructing 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		$ 1,000