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STOCK BASED COMPENSATION (Details 3)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Stock-based compensation    
Number of shares reserved for issuance 1,428,571  
Stock options
   
Stock-based compensation    
Expiration period 10 years  
Vesting period 4 years  
Options granted (in shares) 54,000 32,697