EXHIBIT 2
JOINT FILING AGREEMENT
The undersigned hereby agree to the joint filing of the Amendment No. 1 to Schedule 13D to which this Agreement is attached.
Dated: February 8, 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 |