EXHIBIT 2
JOINT FILING AGREEMENT
The undersigned hereby agree to the joint filing of the Schedule 13D to which this Agreement is attached.
Dated: January 7, 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 |