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Exhibit 10.10

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RESTRICTED STOCK UNITS AGREEMENT

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THIS RESTRICTED STOCK UNITS AGREEMENT (this “Agreement”) is made and effective as of the date specified in Schedule I hereto (the “Grant Date”), by and between the issuer specified in Schedule I hereto (the “Company”) and you.

The Company has adopted the incentive plan that governs the Restricted Stock Units specified in Schedule I hereto (as has been or may hereafter be amended, the “Plan”), a copy of which is attached via a link at the end of this online Agreement as Exhibit A and, by this reference, made a part hereof.  Capitalized terms used and not otherwise defined in this Agreement will have the meanings ascribed to them in the Plan.

Pursuant to the Plan, the Plan Administrator has determined that it would be in the interest of the Company and its stockholders to grant you an Award of Restricted Stock Units, subject to the conditions and restrictions set forth in this Agreement and in the Plan, in order to provide you with additional remuneration for services rendered, to encourage you to remain in service to the Company and to increase your personal interest in the continued success and progress of the Company.

The Company and you therefore agree as follows:

1.Definitions.  The following terms, when used in this Agreement, have the following meanings, except as otherwise defined in Schedule I hereto:

“Agreement” has the meaning specified in the preamble to this Agreement.

“Cause” has the meaning specified as “cause” in Section 10.2(b) of the Plan.

“Common Stock” has the meaning specified in Schedule I hereto.

“Company” has the meaning specified in the preamble to this Agreement.

“Disability” has the meaning specified as “Disability” in Section 2.1 of the Plan.

“Grant Date” has the meaning specified in the preamble to this Agreement.

“Nonemployee Director” has the meaning specified in the Plan.

“Plan” has the meaning specified in the preamble to this Agreement.

“Plan Administrator” has the meaning specified in Section 11 (Plan Administrator).

“Restricted Stock Units” has the meaning specified in Section 2 (Award).

“RSU Dividend Equivalents” has the meaning specified in Section 5 (Dividend Equivalents).

“Section 409A” has the meaning specified in Section 26 (Code Section 409A).

“Service Termination Date” means the date of termination of your service as a Nonemployee Director.

“Tax-Related Items” has the meaning specified in Section 6 (Taxes and Withholding).

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2.Award.  In consideration of your covenants and promises herein, the Company hereby awards to you as of the Grant Date an Award of the number and type of Restricted Stock Units authorized by the Plan Administrator and set forth in the notice of online grant delivered to you pursuant to the Company’s online grant and administration program (the “Restricted Stock Units”), each representing the right to receive one share of the type of Common Stock specified in such notice of online grant, subject to the conditions and restrictions set forth in this Agreement and in the Plan.

3.Vesting.  Unless otherwise determined by the Plan Administrator in its sole discretion, the Restricted Stock Units will vest in accordance with the General Vesting provisions specified in Schedule I hereto, subject to your continuous service as a Nonemployee Director with the Company from the Grant Date through the applicable vesting dates.  Notwithstanding the foregoing, unless otherwise determined by the Plan Administrator in its sole discretion or except as otherwise specified in Schedule I hereto:

(a)Termination for any Reason Other than Disability or Death. All unvested Restricted Stock Units will be forfeited on the Service Termination Date if your service as a Nonemployee Director terminates for any reason other than by reason of your Disability (when Cause does not then exist) or your death.

(b)Disability and Death. All unvested Restricted Stock Units will vest on the Service Termination Date if (i) your service as a Nonemployee Director terminates by reason of your Disability (when Cause does not then exist) or (ii) you die while serving as a Nonemployee Director.

(c)Approved Transaction, Board Change or Control Purchase.  The Restricted Stock Units may become vested in accordance with Section 10.1(b) of the Plan in the event of an Approved Transaction, Board Change or Control Purchase following the Grant Date.

(d)Forfeiture. Upon forfeiture of any unvested Restricted Stock Units, such Restricted Stock Units and any related unpaid RSU Dividend Equivalents will be immediately cancelled, and you will cease to have any rights with respect thereto.

4.No Stockholder Rights.  You will not be deemed for any purpose to be, or to have any of the rights of, a stockholder of the Company with respect to shares of Common Stock represented by any Restricted Stock Units unless and until such time as shares of Common Stock represented by vested Restricted Stock Units have been delivered in accordance with Section 7 (Settlement and Delivery by the Company), nor will the existence of this Agreement affect in any way the right or power of the Company or its stockholders to accomplish any corporate act, including, without limitation, the acts referred to in Section 10.16 of the Plan.

5.Dividend Equivalents.  To the extent specified by the Plan Administrator only, an amount equal to all dividends and other distributions (or the economic equivalent thereof) (in each case, as determined by the Plan Administrator in its sole discretion) that would have been paid on a like number and type of shares of Common Stock as the shares represented by the Restricted Stock Units if such shares had been issued to you when such dividends or other distributions were made (“RSU Dividend Equivalents”) will, if so specified by the Plan Administrator, be retained by the Company for your account and will, unless otherwise specified by the Plan Administrator, be subject to the same conditions and restrictions, including the timing of vesting and delivery, applicable to the Restricted Stock Units to which they relate; provided, however, that the Plan Administrator may, in its sole

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discretion, accelerate the vesting of any portion of the RSU Dividend Equivalent and the settlement thereof shall be made as soon as administratively practicable after the accelerated vesting date, but in no event later than March 15 of the calendar year following the year in which such accelerated vesting date occurs.  RSU Dividend Equivalents shall not bear interest or be segregated in a separate account.  For the avoidance of doubt, unless otherwise determined by the Plan Administrator in its sole discretion, you will have no right to receive, or otherwise with respect to, any RSU Dividend Equivalents until such time, if ever, as the Restricted Stock Units with respect to which such RSU Dividend Equivalents relate shall have become vested, and, if vesting does not occur, the related RSU Dividend Equivalents will be forfeited at the same time the Restricted Stock Units with respect to which such RSU Dividend Equivalents relate are forfeited.

6.Taxes and Withholding.  If the Plan Administrator determines in its sole discretion it is necessary or appropriate to collect national, federal, state or other local or governmental taxes or social security costs and charges or similar contributions (wheresoever arising) with respect to the Award of the Restricted Stock Units or the vesting thereof, or the designation of any RSU Dividend Equivalents as payable or distributable or the payment or distribution thereof, you may be asked to make arrangements satisfactory to the Company to make payment to the Company or its designee of the amount determined by the Plan Administrator as necessary or appropriate to be withheld under such tax laws (collectively, the “Tax-Related Items”).  To the extent the Plan Administrator determines in its sole discretion such withholding is necessary or appropriate because some or all of the Restricted Stock Units and any related RSU Dividend Equivalents vest, you acknowledge and agree that the Company may withhold (a) from the shares of Common Stock represented by vested Restricted Stock Units and otherwise deliverable to you a number of shares of the applicable type of Common Stock and/or (b) from any related RSU Dividend Equivalents otherwise deliverable to you an amount of such RSU Dividend Equivalents, which collectively have a value (or, in the case of securities withheld, a Fair Market Value) equal to the Tax-Related Items, unless you remit such Tax-Related Items to the Company or its designee in cash in such form and by such time as the Company may require or other provisions for withholding such amount satisfactory to the Company have been made.  Notwithstanding any other provisions of this Agreement, the delivery of any shares of Common Stock represented by vested Restricted Stock Units and any related RSU Dividend Equivalents may be postponed until any such withholding taxes have been paid to the Company.  For the avoidance of doubt, the Company may allow for tax withholding in respect of the vesting of the Restricted Stock Units and any related RSU Dividend Equivalents up to the maximum withholding rate applicable to you.  Notwithstanding the foregoing, regardless of any action the Company may take with respect to the foregoing, you acknowledge and agree that the ultimate liability for all Tax-Related Items legally due by you is and remains your responsibility.

7.Settlement and Delivery by the Company.  Subject to Section 6 hereof (Taxes and Withholding), Section 10 hereof (Right of Offset), and Section 15 hereof (Amendment), and except as otherwise provided herein, shares of Common Stock will be delivered in respect of vested Restricted Stock Units (if any) as soon as practicable after the vesting of the Restricted Stock Units as described herein (but no later than March 15 of the calendar year following the year in which such vesting occurs).  Unless otherwise determined by the Plan Administrator, the Company will (a) cause to be issued and transferred to a brokerage account, or registered through the Company’s stock transfer agent for your benefit, book-entry transfers registered in your name for that number and type of shares of Common Stock represented by such vested Restricted Stock Units and any securities representing related vested unpaid RSU Dividend Equivalents, and (b) cause to be delivered to you any cash payment representing related vested unpaid RSU Dividend Equivalents.  Any delivery of securities will be deemed effected for all purposes when (i) in the case of a book-entry transfer, at the time the Company’s stock transfer agent initiates the transfer of such securities to a brokerage account through the Company’s stock transfer

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agent for your benefit or (ii) the Plan Administrator has made or caused to be made such other arrangements for the delivery of such securities as the Plan Administrator deems reasonable.  Any cash payment will be deemed effected when (I) a check from the Company, payable to you in the amount equal to the amount of the cash payment, has been delivered personally to or at your direction or deposited in the United States mail, addressed to you, (II) an amount equal to the amount of the cash payment has been processed through the direct deposit or normal Company payroll processes for your benefit or (III) the Plan Administrator has made or caused to be made such other arrangements for delivery of such cash amount as the Plan Administrator deems reasonable.  Shares representing Restricted Stock Units that have vested may be registered only to you (or during your lifetime, to your court appointed legal representative) or to a person to whom the Restricted Stock Units have been transferred in accordance with Section 10.6 of the Plan and Section 8 below (Nontransferability).

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8.Nontransferability.  Restricted Stock Units and any related unpaid RSU Dividend Equivalents are not transferable (either voluntarily or involuntarily), before or after your death, except as follows: (a) during your lifetime, pursuant to a Domestic Relations Order, issued by a court of competent jurisdiction, that is not contrary to the terms and conditions of the Plan or this Agreement, and in a form acceptable to the Plan Administrator; or (b) after your death, by will or pursuant to the applicable laws of descent and distribution, as may be the case.  Any person to whom Restricted Stock Units and any related unpaid RSU Dividend Equivalents are transferred in accordance with the provisions of the preceding sentence shall take such Restricted Stock Units and any related unpaid RSU Dividend Equivalents subject to all of the terms and conditions of the Plan and this Agreement, including that the vesting and termination provisions of this Agreement will continue to be applied with respect to you.  Restricted Stock Units that have vested may be registered only to you (or during your lifetime, to your court appointed legal representative) or to a person to whom the Restricted Stock Units have been transferred in accordance with this Section 8 and Section 10.6 of the Plan.

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9.Adjustments. The Restricted Stock Units and any related unpaid RSU Dividend Equivalents will be subject to adjustment pursuant to Section 4.2 of the Plan in such manner as the Plan Administrator, in its sole discretion, deems equitable and appropriate in connection with the occurrence of any of the events described in Section 4.2 of the Plan following the Grant Date.

10.Right of Offset.  You hereby agree that the Company shall have the right to offset against its obligation to deliver shares of Common Stock, cash or other property under this Agreement to the extent that it does not constitute “non-qualified deferred compensation” pursuant to Section 409A, any outstanding amounts of whatever nature that you then owe to the Company or a Subsidiary.

11.Plan Administrator.  For purposes of this Agreement, the term “Plan Administrator” means the Compensation Committee of the Board of Directors of the Company or any committee appointed by the Board of Directors as described more fully in Section 3.1 of the Plan; provided, however, that the Board of Directors of the Company shall have the same powers as the Compensation Committee with respect to the Options and may exercise such powers in lieu of action by the Compensation Committee.

12.Restrictions Imposed by Law.  Without limiting the generality of Section 10.8 of the Plan, the Company shall not be obligated to deliver any shares of Common Stock represented by vested Restricted Stock Units or securities constituting any unpaid RSU Dividend Equivalents if counsel to the Company determines that the issuance or delivery thereof would violate any applicable law or any rule or regulation of any governmental authority or any rule or regulation of, or agreement of the Company with, any securities exchange or association upon which shares of Common Stock or such other securities

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are listed or quoted.  The Company will in no event be obligated to take any affirmative action in order to cause the delivery of shares of Common Stock represented by vested Restricted Stock Units or securities constituting any unpaid RSU Dividend Equivalents to comply with any such law, rule, regulation, or agreement.  Any certificates representing any such securities issued or delivered under this Agreement may bear such legend or legends as the Company deems appropriate in order to assure compliance with applicable securities laws.

13.Tax Representations.  You hereby acknowledge that the Company has advised you that you should consult with your own tax advisors regarding the national, federal, state and other local or governmental tax consequences or social security costs and charges or similar contributions (wheresoever arising) of receiving the Award.  You hereby represent to the Company that you are not relying on any statements or representations of the Company, its Affiliates or any of their respective agents with respect to the national, federal, state and other local or governmental tax consequences or social security costs and charges or similar contributions (wheresoever arising) of receiving the Award.  If, in connection with the Award, the Plan Administrator determines in its sole discretion it is necessary or appropriate to withhold any amounts by reason of any national, federal, state and other local or governmental tax or social security costs and charges or similar contributions (wheresoever arising), such withholding shall be effected in accordance with Section 10.9 of the Plan and Section 6 (Taxes and Withholding).

14.Notice.  Unless the Company notifies you in writing of a different procedure or address, any notice or other communication to the Company with respect to this Agreement will be in writing and will be delivered personally or sent by first class mail, postage prepaid, to the address specified for the Company in Schedule I hereto.  Any notice or other communication to you with respect to this Agreement will be provided to you electronically pursuant to the online grant and administration program or via email, unless the Company elects to notify you  in writing, which will be delivered personally, or will be sent by first class mail, postage prepaid, to your address as listed in the records of the Company or any Subsidiary of the Company on the Grant Date, unless the Company has received written notification from you of a change of address.

15.Amendment.  Notwithstanding any other provision hereof, this Agreement may be supplemented or amended from time to time as approved by the Plan Administrator as contemplated by Section 10.7(b) of the Plan.  Without limiting the generality of the foregoing, without your consent:

(a)this Agreement may be amended or supplemented from time to time as approved by the Plan Administrator (i) to cure any ambiguity or to correct or supplement any provision herein that may be defective or inconsistent with any other provision herein, (ii) to add to the covenants and agreements of the Company for your benefit or surrender any right or power reserved to or conferred upon the Company in this Agreement, subject to any required approval of the Company’s stockholders, and provided, in each case, that such changes or corrections will not adversely affect your rights with respect to the Award evidenced hereby (other than if immaterial), (iii) to reform the Award made hereunder as contemplated by Section 10.17 of the Plan or to exempt the Award made hereunder from coverage under Code Section 409A, or (iv) to make such other changes as the Company, upon advice of counsel, determines are necessary or advisable because of the adoption or promulgation of, or change in the interpretation of, any law or governmental rule or regulation, including any applicable federal or state securities laws; and

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(b)subject to any required action by the Board of Directors or the stockholders of the Company, the Restricted Stock Units granted under this Agreement may be canceled by the Plan Administrator and a new Award made in substitution therefor, provided that the Award so substituted will satisfy all of the requirements of the Plan as of the date such new Award is made and no such action will adversely affect any Restricted Stock Units (other than if immaterial) to the extent then vested.

16.Status as a Nonemployee Director.  Nothing contained in the Plan or this Agreement, and no action of the Company or the Plan Administrator with respect thereto, will confer or be construed to confer on you any right to continue as a Nonemployee Director or interfere in any way with the right of the Board of Directors or the Company’s stockholders to terminate your service at any time, with or without Cause, subject to the charter and bylaws of the Company, as the same may be in effect from time to time.

17.Nonalienation of Benefits.  Except as provided in Section 8 (Nontransferability) and Section 10 (Right of Offset), (a) no right or benefit under this Agreement will be subject to anticipation, alienation, sale, assignment, hypothecation, pledge, exchange, transfer, encumbrance or charge, and any attempt to anticipate, alienate, sell, assign, hypothecate, pledge, exchange, transfer, encumber or charge the same will be void, and (b) no right or benefit hereunder will in any manner be subjected to or liable for the debts, contracts, liabilities or torts of you or other person entitled to such benefits.

18.No Effect on Other Benefits.  Any payments made pursuant to this Agreement will not be counted as compensation for purposes of any other employee benefit plan, program or agreement sponsored, maintained or contributed to by the Company or a Subsidiary unless expressly provided for in such employee benefit plan, program, agreement, or arrangement.

19.Governing Law; Venue.  This Agreement will be governed by, and construed in accordance with, the internal laws of the State designated in Section 10.13 of the Plan.  Each party irrevocably submits to the general jurisdiction of the state and federal courts located in the State of Colorado and in the State of Delaware in any action to interpret or enforce this Agreement and irrevocably waives any objection to jurisdiction that such party may have based on inconvenience of forum.

20.Waiver.  No waiver by the Company at any time of any breach by you of, or compliance with, any term or condition of this Agreement or the Plan to be performed by you shall be deemed a waiver of the same term or condition, or of any similar or any dissimilar term or condition, whether at the same time or at any prior or subsequent time.

21.Severability.  The provisions of this Agreement shall be deemed severable and the invalidity or unenforceability of any term or condition hereof shall not affect the validity or enforceability of the other terms and conditions set forth herein.

22.Construction.  References in this Agreement to “this Agreement” and the words “herein,” “hereof,” “hereunder” and similar terms include all Exhibits and Schedules attached hereto, including the Plan.  All references to “Sections” in this Agreement shall be to Sections of this Agreement unless explicitly stated otherwise.  The word “include” and all variations thereof are used in an illustrative sense and not in a limiting sense.  All decisions of the Plan Administrator upon questions regarding the Plan or this Agreement will be conclusive.  Unless otherwise expressly stated herein, in the event of any inconsistency between the terms of the Plan and this Agreement, the terms of the Plan

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will control.  The headings of the sections of this Agreement have been included for convenience of reference only, are not to be considered a part hereof and will in no way modify or restrict any of the terms or provisions hereof.

23.Rules by Plan Administrator.  The Plan Administrator, in its discretion and as contemplated by Section 3.3 of the Plan, may adopt rules and regulations it deems consistent with the terms of the Plan and as necessary or advisable in its operation and administration of the Plan and this Award.  You acknowledge and agree that your rights and the obligations of the Company hereunder will be subject to any further conditions and such reasonable rules and regulations as the Plan Administrator may adopt from time to time.

24.Entire Agreement.  This Agreement is in satisfaction of and in lieu of all prior discussions and agreements, oral or written, between the Company and you regarding the Award.  You and the Company hereby declare and represent that no promise or agreement not expressed herein has been made and that this Agreement contains the entire agreement between the parties hereto with respect to the Award and replaces and makes null and void any prior agreements between you and the Company regarding the Award.  Subject to the restrictions set forth in Sections 8 (Nontransferability) and 15 (Nonalienation of Benefits), this Agreement will be binding upon and inure to the benefit of the parties and their respective heirs, successors and assigns.

25.Acknowledgment.  You will signify acceptance of the terms and conditions of this Agreement by acknowledging the acceptance of this Agreement via the procedures described in the online grant and administration program utilized by the Company.  By your electronic acknowledgment of the Restricted Stock Units, you are acknowledging the terms and conditions of the Award set forth in this Agreement as though you and the Company had signed an original copy of the Agreement.

26.Code Section 409A.  The Awards made hereunder are intended to be “short-term deferrals” exempt from Section 409A and this Agreement shall be interpreted and administered accordingly. Notwithstanding the foregoing, to the extent that Section 409A of the Code or the related regulations and Treasury pronouncements (“Section 409A”) are applicable to you in connection with the Award, this Award is subject to the provisions of Section 10.17 of the Plan regarding Section 409A and each payment under this Agreement shall be treated as a separate payment under Section 409A.  Notwithstanding the foregoing, the Company makes no representations that the Award or the Plan shall be exempt from or comply with Section 409A and makes no undertaking to preclude Section 409A from applying to the Award or the Plan.  If this Agreement fails to meet the requirements of Section 409A, neither the Company nor any of its Affiliates shall have any liability for any tax, penalty or interest imposed on you by Section 409A, and you shall have no recourse against the Company or any of its Affiliate for payment of any such tax, penalty or interest imposed by Section 409A.

27.Additional Conditions and Restrictions.  You may be subject to additional conditions and restrictions.  If a Schedule II is attached hereto, the additional conditions and restrictions specified therein are considered part of this Agreement.

28.Administrative Blackouts.  In addition to its other powers under the Plan, the Plan Administrator has the authority to suspend any transactions under the Plan as it deems necessary or appropriate for administrative reasons.

29.Stock Ownership Guidelines.  This Award may be subject to any applicable stock ownership guidelines adopted by the Company, as amended or superseded from time to time.

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30.Company Information.  You can access the Company’s most recent annual, quarterly and current reports as filed with the Securities and Exchange Commission on the Company’s website specified in Schedule I hereto.  Please refer to these reports as well as the Company’s future filings with the Securities and Exchange Commission (also available on the Company’s website) for important information regarding the Company and its Common Stock.

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Schedule I

to

Restricted Stock Units Agreement

[Insert Grant Code]

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