Leases - Lease Costs and Other Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Lease costs:
Operating lease costs	$ 254	$ 270	$ 494	$ 507
Variable lease costs	24	29	48	55
Total	278	299	542	562
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 250	$ 265	$ 483	$ 495