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

The undersigned hereby agree to the joint filing of the Amendment No. 6 to Schedule 13D to which this Agreement is attached.
 
Dated:  June 13, 2011

 
    DISCOVERY GROUP I, LLC
     
     
    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