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FAIR VALUE MEASUREMENTS - Schedule of Fair Value on Recurring and Non-recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Jun. 22, 2021 | Dec. 31, 2020
Current Assets: |  |  |  |
Equity securities | $ 3,438 | $ 3,438 |  | $ 1,520
Land grant | 1,378 | 1,378 |  |
Total current assets recorded at fair value | 4,816 | 4,816 |  | $ 1,520
Non-current Assets |  |  |  |
Restricted Cash and Cash Equivalents, Noncurrent, Asset, Statement of Financial Position [Extensible List] |  |  |  | us-gaap:DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent
Restricted cash |  |  |  | $ 10
Total non-current assets recorded at fair value |  |  |  | 10
Level 1 |  |  |  |
Current Assets: |  |  |  |
Equity securities | 3,438 | 3,438 |  |
Total current assets recorded at fair value | 3,438 | 3,438 |  |
Non-current Assets |  |  |  |
Restricted cash |  |  |  | 10
Total non-current assets recorded at fair value |  |  |  | 10
Level 3 |  |  |  |
Current Assets: |  |  |  |
Equity securities |  |  |  | 1,520
Land grant | 1,378 | 1,378 |  |
Total current assets recorded at fair value | 1,378 | 1,378 |  | $ 1,520
Recurring |  |  |  |
Non-current Assets |  |  |  |
Increase in fair value of enCore shares | $ 500 | $ 1,900 |  |
Alabama Graphite |  |  |  |
Non-current Assets |  |  |  |
Term of lease |  |  | 10 years |
Alabama Graphite | Non-recurring |  |  |  |
Current Assets: |  |  |  |
Land grant |  |  | $ 1,400 |
Non-current Assets |  |  |  |
Term of lease |  |  | 10 years |

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