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FINANCIAL INSTRUMENTS - Schedule of Fair Value on Recurring and Non-recurring Basis (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Current Assets:    
Equity securities $ 2,931 $ 1,520
Total current assets recorded at fair value 2,931 $ 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
Increase in fair value of equity securities 1,400  
Level 1    
Current Assets:    
Equity securities 2,931  
Total current assets recorded at fair value $ 2,931  
Non-current Assets    
Restricted cash   10
Total non-current assets recorded at fair value   10
Level 3    
Current Assets:    
Equity securities   1,520
Total current assets recorded at fair value   $ 1,520