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STOCK BASED COMPENSATION, SHARE-BASED COMPENSATION (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Stock options    
Stock-based compensation (in dollars) $ 67 $ 306
Stock Options    
Stock options    
Stock-based compensation (in dollars) $ 41  
Expected term 10 years  
Vesting period 48 months