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Convertible Debentures - Additional Information (Detail) $ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 28, 2024 CAD ($) lb shares | May 28, 2024 USD ($) lb $ / shares shares | Sep. 28, 2023 CAD ($) shares | Sep. 22, 2023 CAD ($) shares | Sep. 22, 2023 USD ($) $ / shares shares | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) | Sep. 28, 2023 USD ($) | Sep. 28, 2023 $ / shares | Dec. 31, 2022
Convertible debentures [line items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 9.00% |  |  |  |
Aggregate Principal Amount Of Material Issuance |  | $ 250,000 |  |  |  |  |  |  |  |
Mining assets [member] |  |  |  |  |  |  |  |  |  |
Convertible debentures [line items] |  |  |  |  |  |  |  |  |  |
Purchase of Uranium | lb | 2,702,411 | 2,702,411 |  |  |  |  |  |  |  |
Purchase of mining assets | $ 341,150 | $ 250,000 |  |  |  |  |  |  |  |
2020 Debentures [member] |  |  |  |  |  |  |  |  |  |
Convertible debentures [line items] |  |  |  |  |  |  |  |  |  |
Debentures increased |  |  |  |  |  |  |  | $ 15,000 |  |
Interest rate |  |  |  |  |  |  |  |  |  | 7.50%
Convertible debentures term |  |  | May 27, 2025 |  |  |  |  |  |  |
Shares issued on conversion of convertible debentures | shares |  |  | 8,663,461 |  |  |  |  |  |  |
Stock issued during period related to accrued and unpaid interest | shares |  |  | 19,522 |  |  |  |  |  |  |
Loss on conversion reclassified to accumulated deficit |  |  | $ 361 |  |  |  |  |  |  |
Closing share price | $ / shares |  |  |  |  |  |  |  |  | $ 8.4 |
2023 Debentures [member] |  |  |  |  |  |  |  |  |  |
Convertible debentures [line items] |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of convertible debentures |  |  |  | $ 148,145 | $ 110,000 |  |  |  |  |
Establishment fee, percent |  |  |  | 3.00% | 3.00% |  |  |  |  |
Establishment fee | $ 10,235 |  |  | $ 4,443 | $ 3,300 |  |  |  |  |
Establishment fee (shares) | shares | 909,090 | 909,090 |  | 634,615 | 634,615 |  |  |  |  |
Fair value on the issue date |  |  |  | $ 143,702 | $ 106,700 |  |  |  |  |
Convertible debentures face value |  |  |  |  | $ 110,000 |  |  |  |  |
Convertible debentures term |  |  |  |  |  | 3.7 years | 4.7 years |  |  |
Debt instrument convertible maximum shares issuable on conversion of debt | shares |  |  |  | 16,272,189 | 16,272,189 |  |  |  |  |
Debt instrument conversion price per share | $ / shares |  |  |  |  | $ 6.76 |  |  |  |  |
Convertible debentures [member] |  |  |  |  |  |  |  |  |  |
Convertible debentures [line items] |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) |  |  |  |  |  | $ 15,236 | $ (1,432) |  |  |
Debentures increased |  |  |  |  |  | 455,783 | 158,478 |  |  |
Gains (losses) recognised in profit or loss, fair value measurement, liabilities |  |  |  |  |  | 18,375 | (48,745) |  |  |
Mark-to-market loss on convertible debentures (Note 9) |  |  |  |  |  | 33,611 | (50,177) |  |  |
Interest expense on convertible debentures |  |  |  |  |  | 32,497 | 6,098 |  |  |
Accrued interest on debenture payable |  |  |  |  |  | $ 2,719 | $ 765 |  |  |
2024 Debentures [member] |  |  |  |  |  |  |  |  |  |
Convertible debentures [line items] |  |  |  |  |  |  |  |  |  |
Convertible debentures term | 5.0 years | 5.0 years |  |  |  | 4.4 years |  |  |  |
Fair value of debenture issuance | $ 330,916 | $ 242,500 |  |  |  |  |  |  |  |
Issuance of common shares for debenture holder | shares | 909,090 | 909,090 |  |  |  |  |  |  |  |
Establishment fee | $ 10,235 | $ 7,500 |  |  |  |  |  |  |  |
Percentage of establishment fee | 3.00% | 3.00% |  |  |  |  |  |  |  |
Aggregate Principal Amount Of Material Issuance |  | $ 250,000 |  |  |  |  |  |  |  |
Debt instrument convertible maximum shares issuable on conversion of debt | shares | 23,299,161 | 23,299,161 |  |  |  |  |  |  |  |
Debt instrument conversion price per share | $ / shares |  | $ 10.73 |  |  |  |  |  |  |  |
2024 Debentures [member] | Mining assets [member] |  |  |  |  |  |  |  |  |  |
Convertible debentures [line items] |  |  |  |  |  |  |  |  |  |
Purchase of Uranium | lb | 2,702,411 | 2,702,411 |  |  |  |  |  |  |  |
Purchase of mining assets |  | $ 250,000 |  |  |  |  |  |  |  |

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