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Commitments and contingencies - Additional information related to leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Leases    
Right-to-use operating lease asset $ 5,751 $ 4,425
Right-to-use finance lease asset 44,522 46,925
Total lease assets 50,273 51,350
Operating lease liabilities, current 970 873
Finance lease liabilities, current 2,487 2,411
Operating lease liabilities, non-current 5,078 3,737
Financing lease liabilities, non-current 24,745 24,967
Total lease liabilities 33,280 31,988
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases 823 747
Operating cash flows from finance leases 2,240 1,185
Financing cash flows from finance leases 145 59
Right-to-use asset obtained in exchange for new operating lease liabilities $ 1,580 5,152
Right-to-use asset obtained in exchange for new financing lease liabilities   $ 48,224
Weighted-average remaining lease term - operating leases 8 years 10 months 24 days 8 years 8 months 12 days
Weighted-average remaining lease term - financing leases 18 years 3 months 18 days 19 years 3 months 18 days
Weighted-average discount rate - operating leases 9.80% 7.00%
Weighted-average discount rate - financing leases 8.30% 8.00%