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Leases - Future Minimum Lease Payments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Lease, Liability [Abstract]    
Remainder of 2021 $ 153  
2022 743  
2023 657  
2024 524  
Total operating lease payments 2,077  
Less portion representing imputed interest (161)  
Total lease liabilities 1,916 $ 726
Less current portion 681 494
Long-term portion $ 1,235 $ 232