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Loss per share - Schedule of Net Loss per Common Share (Details) - $ / shares
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Earnings per share [abstract]    
Issued common shares (in shares) 148,661,312 128,528,515
Weighted average number of Common Shares - Basic  (in shares) 141,580,917 105,221,907
Weighted average number of Common Shares - Diluted (in shares) 141,580,917 105,221,907
Diluted net loss per share (in USD per share) $ (2.04) $ (1.18)
Basic net loss per share (in USD per share) $ (2.04) $ (1.18)