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INVESTMENT AT FAIR VALUE (Tables)
6 Months Ended
Jun. 30, 2021
Schedule of Investments [Abstract]  
Schedule of gain on investments
                    
   Three Months Ended   Six Months Ended 
   June 30,   June 30, 
   2021   2020   2021   2020 
   (In thousands) 
Change in fair value of investment, warrants  $   $2,677   $   $3,306 
Change in fair value of investment, common stock               3,479 
Gain on sale of investment, warrants       554    839    554 
Loss on sale of investment, common stock               (3,316)
Net realized and unrealized gain on investment at fair value  $   $3,231   $839   $4,023