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Leases - Gross Difference (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Jan. 01, 2020
Operating Lease Liabilities, Gross Difference, Amount [Abstract]      
Total undiscounted lease payments $ 10,433    
Less: imputed interest 1,555    
Present value of lease liabilities 8,878   $ 9,900
Less: current portion of operating lease liabilities 1,231 $ 1,231  
Operating lease noncurrent liabilities $ 7,647 $ 8,318