Transaction Details

Footnotes

The prices reported are weighted-average prices. These shares were purchased in multiple transactions at prices ranging from $13.51 to $14.23. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer or the SEC staff, upon request, all information regarding the number of shares purchased at each price within the ranges set forth in Footnotes 1 and 3 through 7. | Tang Capital Partners, LP ("TCP") beneficially owns 6,990,461 shares and Tang Capital Partners International, LP ("TCPI") beneficially owns 5,239,039 shares. Kevin Tang is the sole manager of Tang Capital Management, LLC, which is the general partner of TCP and TCPI. Mr. Tang has a pecuniary interest in the shares beneficially held by TCP and TCPI. | These shares were purchased in multiple transactions ranging from $14.00 to $14.18. | These shares were purchased in multiple transactions ranging from $14.35 to $14.61. | These shares were purchased in multiple transactions ranging from $14.04 to $14.50. | These shares were purchased in multiple transactions ranging from $14.14 to $14.33. | These shares were purchased in multiple transactions ranging from $13.97 to $14.39.