Exhibit 99.2
Footnote Disclosure

(1) Not applicable.

(2) Represents securities held directly by St. Paul Venture
Capital VI, LLC, which is jointly managed by Split Rock
Partners, LLC and Vesbridge Partners, LLC.  Voting and
investment power over the shares, however, has been delegated
solely to Split Rock Partners, LLC.  Split Rock Partners, LLC
has delegated voting and investment decisions with respect
to the shares to four individuals who require a two-thirds
vote to act.  St. Paul Fire and Marine Insurance Company, a
wholly owned subsidiary of The St. Paul Travelers Companies,
Inc., has the right to appoint a majority of the members of
the board of directors of St. Paul Venture Capital VI, LLC,
and owns a controlling interest of St. Paul Venture Capital
VI, LLC. Each of Split Rock Partners, LLC, St. Paul Fire and
Marine Insurance Company and The St. Paul Travelers Companies,
Inc. may be deemed to be an indirect beneficial owner of the
reported securities.  Each of Split Rock Partners, LLC, St.
Paul Fire and Marine Insurance Company and The St. Paul
Travelers Companies, Inc. disclaims any beneficial ownership
of the reported securities, except to the extent of any
pecuniary interest therein.  This report shall not be deemed
an admission that any of the reporting persons is the
beneficial owner of such securities for purposes of Section
16 or for any other purpose.

(3) Each share of Series B, Series C and Series D Preferred
Stock automatically converted into shares of the Issuer's
Common Stock on a one-for-one basis immediately prior to the
closing of the Issuer's initial public offering on February
6, 2007.  Prior to its automatic conversion into the Issuer's
Common Stock, the Series B, Series C and Series D Preferred
Stock was convertible at any time at the option of the holder.