EXHIBIT 2
JOINT FILING AGREEMENT
The undersigned hereby agree to the joint filing of Amendment No. 2 to the Schedule 13D to which this Agreement is attached.
Dated: November 9, 2011
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 |