Government assistance programs (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	Jan. 31, 2023	Jul. 31, 2020	Sep. 30, 2022	Sep. 30, 2022	Dec. 31, 2022	May 31, 2021
Unusual or Infrequent Item, or Both [Line Items]
Employee retention credit receivable					$ 847
Other Transaction Authority for Prototype Agreement
Unusual or Infrequent Item, or Both [Line Items]
Grants Receivable		$ 13,300				$ 17,600
Expenses relating to extension of an agreement	$ 0
Payment period of reimbursement contract		30 days
Contra-research and development expense			$ 0	$ 600
Reimbursement expenses received					$ 17,600