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Tax Note - Schedule of temporary difference, unused tax losses and unused tax credits (Details) - USD ($)
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences, unused tax losses and unused tax credits not included in deferred tax assets/liabilities $ 98,507,000 $ 104,016,000
Intangible asset [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences, unused tax losses and unused tax credits not included in deferred tax assets/liabilities $ 4,933,000 6,209,000
Expiry Date Range NA  
Share issue costs and other [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences, unused tax losses and unused tax credits not included in deferred tax assets/liabilities $ 6,142,000 5,162,000
Expiry Date Range 2042 - 2045  
Loss carryforwards [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences, unused tax losses and unused tax credits not included in deferred tax assets/liabilities $ 72,893,000 75,393,000
Expiry Date Range 2025 - Indefinite  
Intercompany loan [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences, unused tax losses and unused tax credits not included in deferred tax assets/liabilities $ 0 12,884,000
Expiry Date Range NA  
Plant and equipment [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences, unused tax losses and unused tax credits not included in deferred tax assets/liabilities $ 14,539,000 $ 4,368,000
Expiry Date Range NA