EX-3 4 ex3.htm EXHIBIT 3

EXHIBIT 3

 

JOINT FILING AGREEMENT

 

The undersigned hereby agree to the joint filing of the Schedule 13D to which this Agreement is attached.

 

Dated:  October 1, 2013

 

  DISCOVERY GROUP I, LLC,  
 
for itself and as general partner of
DISCOVERY EQUITY PARTNERS, L.P.
  
       
       
 
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