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STOCK-BASED COMPENSATION - Stock options activity (Details 1) (Stock Options, USD $)
9 Months Ended
Sep. 30, 2012
Stock Options
 
Shares  
Outstanding at December 31, 2011 704,689
Granted   
Exercised (463,214)
Forfeited   
Expired   
Outstanding and exercisable at September 30, 2012 241,475
Weighted Average Exercise Price  
Outstanding at December 31, 2011 $ 1.31
Granted   
Exercised $ 1.34
Forfeited   
Expired   
Outstanding and exercisable at September 30, 2012 $ 1.25
Weighted Average Remaining Contractual Life  
Outstanding at December 31, 2011 0.99 years
Outstanding and exercisable at September 30, 2012 0.33 years
Aggregate Intrinsic Value  
Outstanding and exercisable at September 30, 2012 $ 2,569,000