Exhibit 99.2
Footnote Disclosure

(1) In prior reports, 308,375 shares were reported as being
held indirectly through Windamere, LLC.  On February 2, 2006,
Windamere, LLC liquidated 30,511 shares to its members.
As part of this distribution, St. Paul Fire and Marine
Insurance Company received directly 30,206 shares and SPVC
Partners I, LLC received directly 241 shares.  As a result of
the distribution, Windamere, LLC holdings decreased from 308,375
to 277,864 prior to the May 2, 2006 disposition.

(2) Represents securities held directly by Windamere, LLC.
Voting and investment power over the shares are generally held
by the managing member of Windamere, LLC; however, investments
or dispositions must be approved by the board of directors of
Windamere, LLC.  Split Rock Partners, LLC has the right to
appoint a majority of the members of the board of directors of
Windamere, LLC.  St. Paul Fire and Marine Insurance Company,
a wholly owned subsidiary of The St. Paul Travelers Companies,
Inc., owns a controlling interest of Windamere, 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) In prior reports, 385,688 shares were reported as being
held indirectly through Windamere II, LLC.  On February 2, 2006,
Windamere II, LLC liquidated 38,160 shares to its members.  As
part of this distribution, St. Paul Fire and Marine Insurance
Company received directly 37,778 shares, and SPVC Partners I,
LLC received directly 80 shares. As a result of the distribution,
Windamere II, LLC holdings decreased from 385,688 to 347,528
prior to the May 2, 2006 disposition.

(4) Represents securities held directly by Windamere II, LLC.
Voting and investment power over the shares are generally held
by the managing member of Windamere II, LLC; however, investments
or dispositions must be approved by the board of directors of
Windamere II, LLC.  Split Rock Partners, LLC has the right to
appoint a majority of the members of the board of directors of
Windamere II, LLC.  St. Paul Fire and Marine Insurance Company,
a wholly owned subsidiary of The St. Paul Travelers Companies,
Inc., owns a controlling interest of Windamere II, 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.

(5) In prior reports, 178,772 shares were reported as being held
indirectly through Windamere III, LLC.  On February 2, 2006,
Windamere III, LLC liquidated 17,688 shares to its members.  As
part of this distribution, St. Paul Fire and Marine Insurance
Company received directly 17,511 shares, and SPVC Management VI,
LLC received directly 31 shares.  As a result of the distribution,
Windamere III, LLC holdings decreased from 178,772 to 161,084
prior to the May 2, 2006 disposition.

(6) Represents securities held directly by Windamere III, LLC.
Voting and investment power over the shares are generally held by
the managing member of Windamere III, LLC; however, investments
or dispositions must be approved by the board of directors of
Windamere III, LLC.  Split Rock Partners, LLC has the right to
appoint a majority of the members of the board of directors of
Windamere III, LLC.  St. Paul Fire and Marine Insurance Company,
a wholly owned subsidiary of The St. Paul Travelers Companies,
Inc., owns a controlling interest of Windamere III, 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.

(7) In prior reports, 937,653 shares were reported as being held
indirectly through Fog City Fund, LLC.  On February 2, 2006, Fog
City Fund, LLC liquidated 92,773 shares to its members.  As part
of this distribution, St. Paul Fire and Marine Insurance Company
received directly 91,846 shares, and SPVC Management VI, LLC
received directly 161 shares.  As a result of the distribution,
Fog City Fund, LLC holdings decreased from 937,653 to 844,880 prior
to the May 2, 2006 disposition.

(8) Represents securities held directly by Fog City Fund, LLC.
Voting and investment power over the shares are generally held by
the managing member of Fog City Fund, LLC; however, investments or
dispositions must be approved by the board of directors of Fog City
Fund, LLC.  Split Rock Partners, LLC has the right to appoint a
majority of the members of the board of directors of Fog City Fund,
LLC.  St. Paul Fire and Marine Insurance Company, a wholly owned
subsidiary of The St. Paul Travelers Companies, Inc., owns a
controlling interest of Fog City Fund, 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.

(9) Represents securities held directly by SPVC Partners I, 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.
Split Rock Partners, LLC may be deemed to be an indirect beneficial
owner of the reported securities.  Split Rock Partners, LLC 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.

(10) Represents securities held directly by SPVC Management 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. Split Rock Partners, LLC may be deemed to be an indirect
beneficial owner of the reported securities.  Split Rock Partners, LLC
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.

(11) Represents securities held directly by St. Paul Venture Capital
V, 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 V, LLC, and owns a controlling interest
of St. Paul Venture Capital V, 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.

(12) 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.

(13) Represents securities held directly by St. Paul Venture Capital
Affiliates Fund I, 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. Split Rock Partners, LLC may be deemed to be an indirect
beneficial owner of the reported securities.  Split Rock Partners, LLC
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.