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INVESTMENTS - Activity in Investments (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Investments rollforward    
Additions/transfers during the period $ 1,777  
Unrealized gain (loss) on securities held 20  
Fair Value end of the period 1,798  
Marketable equity securities    
Investments rollforward    
Opening balance   $ 1,885
Additions/transfers during the period 1,616  
Net gain (loss) on securities sold   (619)
Disposals/transfers during period   $ (1,266)
Unrealized gain (loss) on securities held 20  
Fair Value end of the period 1,636  
Warrants    
Investments rollforward    
Additions/transfers during the period 162  
Fair Value end of the period $ 162