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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