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Commitments and contingencies - Components of lease expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Finance lease costs:    
Amortization of right-of-use assets $ 2,428 $ 1,274
Interest on lease liabilities 2,242 1,185
Operating lease costs 948 885
Total lease cost $ 5,618 $ 3,344