Government assistance programs (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jan. 31, 2023	Jul. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	May 31, 2021	Mar. 27, 2020
Unusual or Infrequent Item, or Both [Line Items]
Contra-research and development expense			$ 600
Refundable employee retention credit						$ 800
Contra General And Administrative Expense			200
Contra expenses				$ 0
Employee retention credit receivable			847	0
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			600	15,200
Prepaid expenses and other current assets			0	2,700
Deferred research obligation liability				2,000
Grant expected to be received			0	$ 1,600
Reimbursement expenses received			$ 17,600