JOINT FILING AGREEMENT
EXHIBIT 2
The undersigned hereby agree to the joint filing of Amendment No. 1 to the Schedule 13D to which this Agreement is attached.
Dated: August 24, 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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▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇
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Managing Member
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*By: /s/ ▇▇▇▇ ▇▇▇▇▇▇▇
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Attorney-in-Fact for ▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇
Attorney-in-Fact for ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇
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