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5. INVESTMENTS (Tables)
6 Months Ended
Jun. 30, 2020
Schedule of Investments [Abstract]  
Schedule of gain (loss) on investments
                    
   Three Months Ended   Six Months Ended 
   June 30,   June 30, 
   2020   2019   2020   2019 
   (In thousands) 
Change in fair value of investment, warrants  $2,677   $3,091   $3,306   $2,394 
Change in fair value of investment, common stock       3,889    3,479    11,494 
Gain on sale of investment, warrants   554        554     
Loss on sale of investment, common stock       (1,642)   (3,316)   (7,232)
Net realized and unrealized gain (loss) on investment at fair value  $3,231   $5,338   $4,023   $6,656