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Tax Assets and Liabilities - Summary of Movement in Deferred Tax Assets/(Liabilities) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Disclosure of Movement in Temporary Differences [Line Items]      
Beginning balance $ (1,777) $ (601)  
Acquired in business combination   (1,890)  
Recognised in profit or loss 4,587 378  
Recognised directly in equity (6,646) 0 $ 0
Effects of movement in foreign exchange rates (28) 336  
Ending balance (3,864) (1,777) (601)
Intangible assets, excluding goodwill [Member]      
Disclosure of Movement in Temporary Differences [Line Items]      
Beginning balance (20,916) (30,002)  
Acquired in business combination   (1,890)  
Recognised in profit or loss 1,917 9,110  
Effects of movement in foreign exchange rates (411) 1,866  
Ending balance (19,410) (20,916) (30,002)
Trade and other receivables [Member]      
Disclosure of Movement in Temporary Differences [Line Items]      
Beginning balance 48    
Recognised in profit or loss (1) 51  
Effects of movement in foreign exchange rates 1 (3)  
Ending balance 48 48  
Convertible notes [Member]      
Disclosure of Movement in Temporary Differences [Line Items]      
Recognised in profit or loss 282    
Recognised directly in equity (6,646)    
Ending balance (6,364)    
Employee benefits [Member]      
Disclosure of Movement in Temporary Differences [Line Items]      
Beginning balance 119    
Recognised in profit or loss (48) 66  
Effects of movement in foreign exchange rates 2 53  
Ending balance 73 119  
Share Based Payments [Member]      
Disclosure of Movement in Temporary Differences [Line Items]      
Beginning balance 228 115  
Recognised in profit or loss (120) 241  
Effects of movement in foreign exchange rates 3 (128)  
Ending balance 111 228 115
Tax loss carry forwards [Member]      
Disclosure of Movement in Temporary Differences [Line Items]      
Beginning balance 18,739 29,286  
Recognised in profit or loss 2,555 (9,034)  
Effects of movement in foreign exchange rates 376 (1,513)  
Ending balance 21,670 18,739 $ 29,286
Other non-current liabilities [Member]      
Disclosure of Movement in Temporary Differences [Line Items]      
Beginning balance 5    
Recognised in profit or loss 2 (56)  
Effects of movement in foreign exchange rates 1 61  
Ending balance $ 8 $ 5