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Commitments and contingencies - Other information (Details) - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Mar. 31, 2023
Leases      
Right-to-use operating lease asset $ 4,882   $ 5,208
Right-to-use finance lease asset 38,451   39,665
Total lease assets 43,333   44,873
Operating lease liabilities, current 1,138   1,118
Finance lease liabilities, current 2,678   2,639
Operating lease liabilities, non-current 4,052   4,389
Financing lease liabilities, non-current 23,709   23,965
Total lease liabilities 31,577   $ 32,111
Cash paid for amounts included in the measurement of lease liabilities:      
Operating cash flows from operating leases 528 $ 466  
Operating cash flows from finance leases 1,086 1,102  
Financing cash flows from finance leases 217 163  
Right-to-use asset obtained in exchange for new operating lease liabilities $ 0 $ 0  
Weighted-average remaining lease term - operating leases 6 years 1 month 6 days 7 years 1 month 6 days  
Weighted-average remaining lease term - financing leases 15 years 9 months 18 days 16 years 9 months 18 days  
Weighted-average discount rate - operating leases 10.20% 9.80%  
Weighted-average discount rate - financing leases 8.30% 8.30%