Exhibit 99.1
Footnotes to Form 3
(1) This amount excludes an aggregate of 405,052 shares of Class A common stock
that the Reporting Persons have irrevocably agreed to sell to the Issuer
upon closing of the initial public offering ("IPO"), at a price per share
equal to the IPO price of the Class A common stock minus underwriting
discounts. This transaction was approved by the board of directors of the
Issuer for purposes of Rule 16b-3 of the Securities Exchange Act of 1934, as
amended.
(2) SEA VII Management, LLC ("Spectrum") manages funds that collectively own
2,952,733 shares of Class A common stock of the Issuer and 28,352,972 shares
of Class B common stock of the Issuer, which are represented as follows: (i)
2,952,733 shares of Class A common stock held directly by SE VII DHC AIV
Feeder, L.P. ("Spectrum Feeder"), (ii) 28,287,857 shares of Class B common
stock held directly by SE VII DHC AIV, L.P. ("SE VII DHC AIV"); (iii) 41,104
shares of Class B common stock held directly by Spectrum VII Investment
Managers Fund, L.P. ("Spectrum Investment Managers Fund"); and (iv) 24,011
shares of Class B common stock held directly by Spectrum VII Co-Investment
Fund, L.P. ("Spectrum VII Co-Investment Fund" and, together with Spectrum
Feeder, SE VII DHC AIV, Spectrum Investment Managers' Fund and Spectrum VII
Co-Investment FUnd, the "Spectrum Funds").
(3) SEA VII Management, LLC is the general partner of Spectrum Equity
Associates VII, L.P., which in turn is the general partner of the Spectrum
Funds.
(4) Each Reporting Person disclaims Section 16 beneficial ownership of the
shares reported herein except to the extent of its pecuniary interest
therein, if any, and the inclusion of these shares in this report shall not
be deemed an admission of beneficial ownership of any of the reported shares
for purposes of Section 16 or any other purpose.
(5) The Reporting Person may exchange LLC Units of AIDH Topco, LLC for shares of
Class A Common Stock of the Issuer on a one-for-one basis, subject to
certain exceptions, conditions and adjustments. The LLC Units of AIDH Topco,
LLC have no expiration date. At the time of any such exchange, an equal
number of shares of Class B Common Stock of the Issuer held by the Reporting
Person, which have no economic value and entitle holders thereof to one vote
per share on all matters on which stockholders of the Issuer are entitled to
vote generally, are cancelled.
