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STOCK BASED COMPENSATION (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Stock-based compensation    
Stock-based compensation costs before income taxes $ 221 $ 164
General and administrative    
Stock-based compensation    
Stock-based compensation costs before income taxes 142 107
Research and development    
Stock-based compensation    
Stock-based compensation costs before income taxes $ 79 $ 57