EXHIBIT 2
JOINT FILING AGREEMENT
The undersigned hereby agree to the joint filing of the Amendment No. 11 to Schedule 13D to which this Agreement is attached.
Dated: September 22, 2010
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 | |