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 | ||