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Income Tax Benefit (Expense) - Schedule of Income Tax Recognized in Profit or Loss (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Current tax expense      
Current period $ (24) $ (349) $ (60)
Adjustment for prior period (56)    
Current tax expense (80) (349) (60)
Deferred tax benefit (expense)      
Origination and reversal of temporary differences 4,203 14,844 7,156
Change in unrecognized deductible temporary differences (3,335) (14,700) (6,385)
Utilization of previously unrecognised tax losses 37 159 29
Recognition of previously unrecognized tax losses 3,509    
Utilization of previously recognized tax losses 173 75  
Deferred tax benefit (expense) 4,587 378 800
Total $ 4,507 $ 29 $ 740