Lease Commitments - Summary of Supplemental Balance Sheet Information Related to the Operating Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets:
Operating lease right-of-use assets	$ 2,031	$ 2,373
Liabilities:
Operating lease liabilities, current	484	474
Operating lease liabilities	1,280	1,557
Total operating lease liabilities	$ 1,764	$ 2,031