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Operating Leases - Future Minimum Lease Payments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Finance Minimum Lease Payments    
2021 $ 104  
2022 239  
2023 27  
Total lease payments 370  
Less: Amounts representing interest (20)  
Present value of lease liabilities $ 350 $ 624