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Leases - Future lease payments required under lease obligations (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Minimum lease payments:    
Remainder of 2021 $ 556  
2022 2,660  
2023 2,744  
2024 1,160  
Total future minimum lease payments 7,120  
Less: imputed interest (855)  
Present value of lease liabilities $ 6,265 $ 5,959