Leases (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
5. Leases
Operating lease cost	$ 737
Cash paid for amounts included in the measurement of lease liabilities	717
Operating cash flows from operating leases	0
Right-of-use assets obtained in exchange for new lease liabilities - operating leases	$ 1,927
Weighted-average remaining lease term - operating leases	8 years 7 days
Weighted-average discount rate - operating leases	2.39%