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Leases - Future Minimum Lease Payments Under Operating Leases (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Leases [Abstract]    
2021 (Remainder) $ 110  
2022 669  
2023 817  
2024 836  
2025 808  
2026 564  
Thereafter 144  
Total 3,948  
Less present value discount (625)  
Present value of total operating lease liabilities 3,323  
Less current portion (447) $ (589)
Long-term obligations under operating leases $ 2,876 $ 997