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Deferred Revenue (Tables) | 12 Months Ended
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Dec. 31, 2024
Deferred Revenues Disclosure [Abstract] |
Summary of deferred revenue balance | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31 | ​ | At December 31
(in thousands) |  | 2024 |  | 2023
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred revenue-pre-sold toll milling: |  |  | ​ | ​ | ​ | ​
CLJV Toll Milling-Ecora | ​ | $ | 33,993 |  | $ | 34,958
​ | ​ | $ | 33,993 |  | $ | 34,958
Deferred revenue-by balance sheet presentation: | ​ | ​ | ​ | ​ | ​ | ​
Current | ​ | $ | 4,501 |  | $ | 4,535
Non-current | ​ | ​ | 29,492 | ​ | ​ | 30,423
​ | ​ | $ | 33,993 |  | $ | 34,958
Summary of deferred revenue liability continuity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2024 |  | 2023
​ | ​ | ​ | ​ | ​ | ​ | ​
Balance-January 1 |  | $ | 34,958 |  | $ | 33,295
Revenue recognized during the period (note 18) | ​ | ​ | (4,023) | ​ | ​ | (1,855)
Accretion (note 17) | ​ | ​ | 3,058 | ​ | ​ | 3,518
Balance-December 31 |  | $ | 33,993 |  | $ | 34,958

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