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Commitments and contingencies - Future lease payments under operating and financing lease liabilities (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
Operating lease  
2022 $ 970
2023 980
2024 989
2025 998
2026 1,008
Thereafter 4,066
Total lease payments 9,011
Less: interest 2,963
Total lease liabilities 6,048
Financing lease  
2022 2,487
2023 2,562
2024 2,639
2025 2,718
2026 2,799
Thereafter 40,905
Total lease payments 54,110
Less: interest 26,878
Total lease liabilities 27,232
Total  
2022 3,457
2023 3,542
2024 3,628
2025 3,716
2026 3,807
Thereafter 44,971
Total lease payments 63,121
Less: interest 29,841
Total lease liabilities $ 33,280