Leases - Lease Costs and Other Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Lease costs:
Operating lease costs	$ 240	$ 237
Variable lease costs	24	26
Total	264	263
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 233	$ 230