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Leases - Supplemental Balance Sheet Information (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Operating leases    
Operating lease right-of-use assets $ 4,435,000 $ 5,494,000
Operating lease liabilities - current 961,000 1,109,000
Operating lease liabilities - long-term 3,942,000 4,899,000
Total operating lease liabilities 4,903,000 6,008,000
Finance leases    
Property and equipment, at cost 8,663,000 8,663,000
Accumulated depreciation (6,293,000) (4,624,000)
Property and equipment, net $ 2,370,000 $ 4,039,000
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization
Finance lease liabilities - current $ 37,000 $ 54,000
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Long-term Debt and Capital Lease Obligations, Current Long-term Debt and Capital Lease Obligations, Current
Finance lease liabilities - long-term $ 8,000 $ 44,000
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Long-term Debt and Capital Lease Obligations Long-term Debt and Capital Lease Obligations
Total finance lease liabilities $ 45,000 $ 98,000
Weighted average remaining lease term:    
Operating leases 4 years 9 months 18 days 5 years 7 months 6 days
Finance leases 9 months 18 days 1 year 7 months 6 days
Weighted average discount rate:    
Operating leases 5.04% 5.04%
Finance leases 5.04% 5.00%