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Share-Based Compensation - Restricted Stock Units (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Share-Based Compensation |  |  |  |  |  |
Aggregate vested units outstanding |  |  |  | 416,446 |  |
Restricted Stock Units ("RSUs") |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Granted | 1,027,561 |  | 21,452,356 | 13,026,567 | 32,414,380 | 33,079,041
Total unrecognized share-based compensation expense | $ 16,200,000 |  |  | $ 16,200,000 |  | $ 20,500,000
Share based compensation expense | 6,200,000 |  | $ 5,300,000 | 11,600,000 | $ 8,500,000 |
Restricted Stock Units ("RSUs") | Non-employee directors |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Granted |  | 60,000 |  |  |  |
Restricted Stock Units ("RSUs") | General and administration expenses |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Share based compensation expense | 3,000,000 |  | 2,200,000 | 6,500,000 | 4,100,000 |
Restricted Stock Units ("RSUs") | General and administration expenses | Non-employee |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Share based compensation expense |  | $ 100,000 |  |  |  |
Restricted Stock Units ("RSUs") | Exploration and evaluation activities |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Share based compensation expense | $ 3,200,000 |  | $ 3,100,000 | $ 5,100,000 | $ 4,400,000 |
Restricted Stock Units ("RSUs") | Director | Non-employee directors |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Granted | 134,226 |  |  |  |  |
Fair value of shares vested | $ 600,000 |  |  |  |  |
Vesting Immediately | Restricted Stock Units ("RSUs") |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Granted | 462,042 |  | 206,260 | 3,081,627 | 4,006,695 |
Vesting Immediately | Restricted Stock Units ("RSUs") | Share-based payment arrangement, employee |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Granted | 60,000 |  |  |  |  |
Vesting Immediately | Restricted Stock Units ("RSUs") | Consultant | Non-employee |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Granted | 310,530 |  |  |  |  |
Vesting Immediately | Restricted Stock Units ("RSUs") | Consultant | General and administration expenses | Non-employee |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Share based compensation expense | $ 800,000 |  |  |  |  |
Vesting Immediately | Restricted Stock Units ("RSUs") | Director | Non-employee |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Total fair value of units granted | $ 398,075 |  |  |  |  |
Vesting Immediately | Restricted Stock Units ("RSUs") | Director | Non-employee directors |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Granted | 91,512 |  |  |  |  |
Vesting fully within and on first anniversary of the grant date | Restricted Stock Units ("RSUs") |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Granted | 134,226 |  | 476,189 | 194,226 | 493,430 |
Vesting in thirds on each anniversary of the grant date | Restricted Stock Units ("RSUs") |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Granted |  |  | 68,027 | 8,818,935 | 7,212,375 |
Vesting in fourths on each anniversary of the grant date | Restricted Stock Units ("RSUs") |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Granted |  |  | 701,880 | 176,302 | 701,880 |
Vesting based on performance conditions | Restricted Stock Units ("RSUs") |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Granted | 364,785 |  |  | 688,969 |  |
Vesting based on performance conditions | Restricted Stock Units ("RSUs") | Consultant | Fee for securing the agreement | Non-employee |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Granted | 338,653 |  |  | 338,653 |  |
Total fair value of units granted | $ 1,900,000 |  |  | $ 1,900,000 |  |
Vesting based on performance conditions | Restricted Stock Units ("RSUs") | Consultant | Professional and consulting fees | Non-employee |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Granted | 26,132 |  |  |  |  |
Total fair value of units granted | $ 100,000 |  |  |  |  |
Vesting based on market conditions | Restricted Stock Units ("RSUs") |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Granted |  |  | 20,000,000 |  | 20,000,000 |
Vesting three years from grant date | Restricted Stock Units ("RSUs") |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Granted | 66,508 |  |  | 66,508 |  |
Vesting three years from grant date | Restricted Stock Units ("RSUs") | Director | Non-employee |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Fair value of shares vested | $ 300,000 |  |  | $ 300,000 |  |
Shares award granted award vesting period | 3 years |  |  | 3 years |  |

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