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Related Parties - Summary of Transaction with Entity Providing Key Management Personnel Services (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Disclosure Of Transactions Between Related Parties [Abstract]      
Key management personnel services $ 5 $ 4 $ 2
Consultancy services $ 13 $ 28 $ 26