Accrued expenses and other current liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Accrued expenses and other current liabilities:
Accrued research and development	$ 8,234	$ 6,863
Accrued compensation and benefits	3,727	5,084
Accrued capital expenditures	2,766	0
Accrued professional fees	947	1,246
Other	1,284	413
Total accrued expenses and other current liabilities	$ 16,958	$ 13,606