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Leases - Maturities of operating lease liabilities (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Leases [Abstract]  
2021 $ 578
2022 590
2023 602
2024 614
2025 206
Thereafter 0
Total lease payments 2,590
Less: interest 276
Present value of lease liabilities $ 2,314