Exhibit 10.15


 


Director Compensation Arrangements


 


Compensation of Non-Employee Directors Upon Initial Election to the Board


 


Each non-employee director will be entitled to receive a non-qualified
stock option having an aggregate Black-Scholes cash value of $120,000, rounded to the nearest 100 shares, provided that in no case
shall such stock option be less than 25,000 shares (so long as 25,000 shares are required to be granted under the equity incentive
plan of the Corporation). Such option shall be for the purchase of common stock of the Corporation and shall vest annually over
three years and be granted on the fifth business day following his or her initial election to the Board.


 


Annual Compensation of Non-Employee Directors


 


The annual retainers described herein shall each be satisfied by
the issuance of deferred stock awards of restricted stock units (each a “Retainer Award”) in accordance herewith. Each
non-employee director will be entitled to receive an annual retainer valued at $31,500. The Chairman will also be entitled to receive
an additional annual retainer valued at $31,500. Each non-employee director member of the Audit Committee will be entitled to receive
an additional annual retainer valued at $8,100. Each non-employee director member of the Compensation Committee will be entitled
to receive an additional annual retainer valued at $5,400. Each non-employee member of the Governance Committee will be entitled
to receive an additional annual retainer valued at $4,500. The Committee Chairman of the Audit Committee will be entitled to receive
an additional annual retainer valued at $16,200. The Committee Chairman of the Compensation Committee will be entitled to receive
an additional annual retainer valued at $10,800. The Committee Chairman of the Governance Committee will be entitled to receive
an additional annual retainer valued at $4,500. The Retainer Awards for individuals that are non-employee directors of the Corporation
as of the first trading day of January of the corresponding year, are granted on the first trading day of January (the “Grant
Date”) and vest quarterly over the calendar year (on each March 31, June 30, September 30 and December 31, provided that
in the event a director’s service (including as a Board member, or just role as Chairman, Committee Chairman, Committee member)
ends during a particular quarter, the vesting date for such quarter in relation to the portion of the award attributable to such
roles that are ending, shall be the last day of the director’s term in the respective role such that the full quarterly amount
attributable to such roles shall vest on that earlier vesting date) and subject to continued service as a non-employee director
on the applicable vesting dates) and subject to continued service as a non-employee director on the applicable vesting dates. The
number of shares of common stock subject to a Retainer Award is equal to the amount of cash that would have been received had the
retainers all been paid in cash, divided by the average daily closing market price of the common stock for the month of November,
rounded to the nearest 100 shares.


 


In the event that a non-employee director is named Chairman or joins
any committees of the Board of Directors during a fiscal year after the Grant Date, such director shall be granted a Retainer Award
(the “Additional Retainer Award”), in relation to such additional roles and respective retainer amounts pro-rated for
the remainder of such year, on the first trading day of the month after the individual is appointed to such roles. The Additional
Retainer Award shall vest in equal amounts spread over the remaining quarterly vesting dates of the Retainer Awards for such calendar
year subject to continued service as a non-employee director on the applicable vesting dates, provided that in the event a director’s
service (including as a Board member, or their role as Chairman, Committee Chairman, Committee member) ends during a particular
quarter, the vesting date for such quarter in relation to the portion of the award attributable to such roles that are ending,
shall be the last day of the director’s term in the respective role such that the full quarterly amount attributable to such
roles shall vest on that earlier vesting date (i.e. if the Additional Retainer Award is granted on September 1, one half would
vest on September 30 and the remaining half would vest on December 31). The number of shares of common stock subject to an Additional
Retainer Award is equal to the amount of cash that would have been received had the retainers all been paid in cash, divided by
the average daily closing market price of the common stock for the calendar month that is two months prior to the month the director
was appointed to the additional roles, rounded to the nearest 100 shares (i.e., the month of June if the director was appointed
to the additional roles on August 15).


 


Each non-employee director will also be entitled to receive an equity
award having an aggregate cash value of $72,000, rounded to the nearest 100 shares, vesting fully on the earlier to occur of (i)
the date of the Corporation’s next Annual Meeting of Stockholders after the grant date, immediately prior to the commencement
of such meeting, and (ii) one year from the date of grant and granted on the fifth business day following the Corporation’s
Annual Meeting of Stockholders, with such award to be evidenced by a grant of deferred stock awards of restricted stock units.
In addition, non-employee directors shall be reimbursed for their expenses incurred in connection with attending Board and Committee
meetings.