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INTANGIBLE ASSETS, AMORTIZATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Amortization      
Amortization expense $ 17 $ 17 $ 17
Future amortization      
2018 17    
2019 17    
2020 17    
2021 $ 10