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Operating Leases - Future Minimum Lease Payments Under Lease Agreements (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Future Minimum Lease Payments    
2021 $ 414,000  
2022 239,000  
2023 26,000  
Total lease payments 679,000  
Less: Amounts representing interest (55,000)  
Present value of lease liabilities $ 624,000 $ 977,000