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INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Jul. 31, 2007
BCH License [Member]      
Intangible assets      
Useful life 15 years    
Intangible assets - gross $ 200 $ 200 $ 75
Patent licensing fee      
Intangible assets      
Useful life 15 years    
Intangible assets - gross $ 200 200  
Accumulated amortization (196) (191)  
Intangible assets, net $ 4 $ 9