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Amounts receivable and prepaid expenses - Additional information (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2024
Mar. 31, 2025
Mar. 28, 2024
Amounts receivable and prepaid expenses      
Royalties receivable, collectability period (in days) 60 days    
Kensington      
Amounts receivable and prepaid expenses      
Consideration to be received   $ 3,750 $ 6,750