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Revenue - Schedule of Changes in Contract Assets (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenue [Abstract]    
Balance at the beginning of the year $ 0 $ 313
Revenue recognised during the year 0 0
Invoices raised during the year 0 (307)
Translation exchange difference 0 (6)
Balance at the end of the year $ 0 $ 0