Asset Retirement Obligations (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Change in estimated liability | $ 11 | $ 2,840 |
| Lost Creek Project | ||
| Estimated Future Cash Undiscounted Amount | 18,300 | |
| Change in estimated liability | $ 125 | 2,577 |
| Lost Creek Project | Minimum | ||
| Discount Rate Of Asset Retirement Obligations | 0.33% | |
| Lost Creek Project | Maximum | ||
| Discount Rate Of Asset Retirement Obligations | 7.25% | |
| Pathfinder properties | ||
| Estimated Future Cash Undiscounted Amount | $ 11,500 | |
| Change in estimated liability | $ (114) | $ 263 |
| Pathfinder properties | Minimum | ||
| Discount Rate Of Asset Retirement Obligations | 1.53% | |
| Pathfinder properties | Maximum | ||
| Discount Rate Of Asset Retirement Obligations | 7.25% | |
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- Definition Discount Rate Of Asset Retirement Obligations No definition available.
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- Definition Amount of estimated future cash undiscounted amount. No definition available.
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- Definition Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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