Mineral Properties, Plant and Equipment, Net - Additional Information (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Restricted Stock Units (RSUs) [Member] | Thacker Pass [Member] | ||||
| Property, Plant and Equipment [Line Items] | ||||
| Stock-based compensation, capitalized | $ 0.6 | $ 0.3 | $ 1.3 | $ 0.6 |