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:  February 15, 2013    
     
 
DISCOVERY GROUP I, LLC,
for itself and as general partner of
DISCOVERY EQUITY PARTNERS, L.P.
  
       
 
By
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