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: September 8, 2011
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DISCOVERY GROUP I, LLC,
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for itself and as general partner of
DISCOVERY EQUITY PARTNERS, L.P.
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By Xxxxxxx X. Xxxxxx*
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Xxxxxxx X. Xxxxxx
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Managing Member
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Xxxxxx X. Xxxxxxxx*
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Xxxxxx X. Xxxxxxxx
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Xxxxxxx X. Xxxxxx*
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Xxxxxxx X. Xxxxxx
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*By: /s/ Xxxx Xxxxxxx
Xxxx Xxxxxxx
Attorney-in-Fact for Xxxxxx X. Xxxxxxxx
Attorney-in-Fact for Xxxxxxx X. Xxxxxx
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