EXHIBIT 1
JOINT FILING AGREEMENT
In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of the Schedule 13D (and any further amendment filed by them) with respect to the Common Stock, par value $0.0001 per share, of the Issuer, a Delaware corporation.
Dated: April 12, 2012
| SYMPHONY CAPITAL PARTNERS, L.P. | |
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| By: | Symphony Capital GP, L.P. |
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| By: | Symphony GP, LLC |
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| By: | /s/Mark Kessel |
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| Name: Mark Kessel |
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| SYMPHONY CAPITAL GP, L.P. | |
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| By: | Symphony GP, LLC |
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| By: | /s/Mark Kessel |
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| Name: Mark Kessel |
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| SYMPHONY GP, LLC | |
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| By: | /s/Mark Kessel |
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| Name: Mark Kessel |
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| SYMPHONY STRATEGIC PARTNERS, LLC | |
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| By: | /s/Mark Kessel |
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| Name: Mark Kessel |
| /s/Mark Kessel |
| MARK KESSEL |
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| /s/Harri V. Taranto |
| HARRI V. TARANTO |
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| /s/Andrew L. Busser |
| ANDREW L. BUSSER |
