EX-2 3 ex2.htm EXHIBIT 2 ex2.htm
EXHIBIT 2
 
JOINT FILING AGREEMENT

   
The undersigned hereby agree to the joint filing of the Schedule 13D to which this Agreement is attached.
 
Dated:  September 13, 2012
 
  DISCOVERY GROUP I, LLC  
     
       
 
By:
/s/ Michael R. Murphy*  
   
Michael R. Murphy
Managing Member
  
       
 
  Daniel J. Donoghue*  
  Daniel J. Donoghue*  
     
     
  Michael R. Murphy*  
  Michael R. Murphy  
     
     
 
By:
/s/ Mark Buckley  
    Mark Buckley  
    Attorney-in-Fact for Daniel J. Donoghue  
    Attorney-in-Fact for Michael R. Murphy