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Leases - Maturities of Lease Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Leases [Abstract]    
2021 (October 1 through December 31) $ 539  
2022 1,891  
2023 1,711  
2024 1,711  
2025 1,710  
After 2025 3,579  
Total lease payments 11,141  
Less: Discount 2,531  
Present value of lease liabilities 8,610  
Current portion of lease liabilities 1,315 $ 2,101
Non-current portion of lease liabilities $ 7,295 $ 8,469