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Operating lease commitments and contingencies - Summary of Future Minimum Rental Commitments Under Operating Leases (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Operating lease commitments and contingencies  
2020 $ 597
2021 585
2022 589
2023 508
2024 435
Thereafter 5,513
Total payments 8,227
Less amount representing interest (2,033)
Present value of future minimum lease payments $ 6,194