EX-2 3 t81768_ex2.htm EXHIBIT 2

EXHIBIT 2
 
JOINT FILING AGREEMENT

The undersigned hereby agree to the joint filing of the Amendment No. 3 to Schedule 13D to which this Agreement is attached.
 
Dated:  March 13, 2015
       
 
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