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Loan Payable - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2023
Jan. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Aug. 31, 2024
Dec. 31, 2022
Aug. 31, 2021
Disclosure of detailed information about borrowings [line items]              
Borrowings $ 32,752,000   $ 34,550,000 $ 32,752,000   $ 40,489,000  
Loss on debt modification     783,000 (314,000)      
Interest expense     3,814,000 5,091,000      
Franco-Nevada Credit Facility              
Disclosure of detailed information about borrowings [line items]              
Borrowing facilities, maximum borrowing capacity         $ 35,000,000    
Borrowings $ 0   34,550,000 0   0  
Loss on debt modification     0 0      
Interest expense     1,190,000 $ 0      
Franco-Nevada Credit Facility | Minimum              
Disclosure of detailed information about borrowings [line items]              
Annual interest rate, percentage         3.00%    
Franco-Nevada Credit Facility | Maximum              
Disclosure of detailed information about borrowings [line items]              
Annual interest rate, percentage         4.25%    
Sprott Credit Facility              
Disclosure of detailed information about borrowings [line items]              
Annual interest rate, percentage 12.98%     12.98%     7.00%
Borrowings $ 32,752,000   0 $ 32,752,000 $ 0 $ 40,489,000 $ 44,000,000
Restricted cash             $ 1,500,000
Percentage of fee on outstanding loan balance   1.50%          
Fees on loan payable   $ 660,000          
Early repayment of loan 10,000,000            
Borrowings outstanding $ 34,660,000     34,660,000      
Loss on debt modification     783,000 314,000      
Interest expense     $ 2,624,000 $ 5,091,000