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Commitments and contingencies - Components of lease expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Finance lease costs:        
Amortization of right-to-use asset $ 607 $ 607 $ 1,214 $ 1,214
Interest on lease liabilities 550 557 1,102 1,115
Operating lease costs 252 245 511 487
Total lease cost $ 1,409 $ 1,409 $ 2,827 $ 2,816