Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021
Leases
Lease liabilities					$ 1,068
Right-of-use assets					$ 1,031
Weighted average remaining lease term			3 years 9 months 14 days
Weighted average discount rate					2.93%
Operating lease cost	$ 15	$ 25	$ 51	$ 58
Total lease cost	15	25	51	58
Cash paid for amounts included in the measurement of lease liabilities	$ 35	$ 31	$ 66	$ 69