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INTANGIBLE ASSETS (Details) - Patent licensing fee - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Intangible assets    
Useful life 15 years  
Intangible assets - gross $ 200 $ 200
Accumulated amortization (191) (174)
Intangible assets, net $ 9 $ 26