Pursuant to this Stock Option Agreement (the “Option Agreement”) and the Stock Option Grant Notice to which this Option Agreement is attached (the “Grant Notice”), the Company hereby grants to the Optionee under the Plan an Option to purchase the number of Shares indicated in the Grant Notice at the exercise price per share set forth in the Grant Notice (the “Exercise Price”).

Pursuant to this Stock Option Agreement (the “Option Agreement”) and the Stock Option Grant Notice to which this Option Agreement is attached (the “Grant Notice”),of Option. The Plan Administrator of the Company hereby grants to the Optionee undernamed in the PlanNotice of Grant (the “Optionee”), an Optionoption (the “Option”) to purchase the number of Shares indicatedset forth in the Grant Notice of Grant, at the exercise price per shareShare set forth in the Notice of Grant Notice (the “Exercise Price”)., and subject to the terms and conditions of the Plan, which is incorporated herein by reference. Subject to [Section 15(c)] of the Plan, in the event of a conflict between the terms and conditions of the Plan and this Option Agreement, the terms and conditions of the Plan shall prevail.

PursuantGrant of Option. ​, ​ (the “Company”), hereby grants to this​ (“Optionee”), an option (the “Option”) to purchase the total number of shares of Common Stock Option Agreement (the “Option Agreement”“Shares”) andset forth in the Notice of Stock Option Grant Notice to which this Option Agreement is attached (the “Grant Notice”“Notice”), the Company hereby grants to the Optionee under the Plan an Option to purchase the number of Shares indicated in the Grant Notice at the exercise price per shareShare set forth in the Grant Notice (the “Exercise Price”). subject to the terms, definitions and provisions of the ​ 2008 Stock Plan (the “Plan”) adopted by the Company, which is incorporated in this Agreement by reference. Unless otherwise defined in this Agreement, the terms used in this Agreement shall have the meanings defined in the Plan.

Pursuant to this Stock Option Agreement (the “Option Agreement”) and the Stock Option Grant Notice to which this Option Agreement is attached (the “Grant Notice”),of Option. The Administrator of the Company hereby grants to the Optionee underParticipant named in the PlanNotice of Stock Option Grant in Part I of this Agreement, an Option to purchase the number of Shares indicatedset forth in the Grant Notice of Stock Option Grant, at the exercise price per shareShare set forth in the Notice of Stock Option Grant Notice (the “Exercise Price”“Exercise Price”)., and subject to the terms and conditions of the Plan, which is incorporated herein by reference. Subject to [Section 18(c)] of the Plan, in the event of a conflict between the terms and conditions of the Plan and this Option Agreement, the terms and conditions of the Plan shall prevail.

Pursuant to this Stock Option Agreement (the “Option Agreement”) and the Stock Option Grant Notice to which this Option Agreement is attached (the “Grant Notice”),of Option. The Administrator of the Company hereby grants to the Optionee underParticipant named in the PlanNotice of Stock Option Grant in Part I of this Agreement (“Participant”), an Optionoption (the “Option”) to purchase the number of Shares indicatedset forth in the Grant Notice of Stock Option Grant, at the exercise price per shareShare set forth in the Notice of Stock Option Grant Notice (the “Exercise Price”)., and subject to the terms and conditions of the Plan, which is incorporated herein by reference. Subject to [Section 18] of the Plan, in the event of a conflict between the terms and conditions of the Plan and this Option Agreement, the terms and conditions of the Plan shall prevail.

Pursuant This Agreement evidences the grant by the Company on the Grant Date to this Stock Option Agreement (the “Option Agreement”)the Participant, of an option to purchase, in whole or in part, on the terms provided herein and in the Plan, an aggregate of the Shares set forth in the Stock Option Grant Notice to which this Option Agreement is attached (the “Grant Notice”), the Company hereby grants to the Optionee under the Planat an Option to purchase the number of Shares indicated in the Grant Notice at the exercise priceExercise Price per shareShare set forth in the Stock Option Grant Notice (the “Exercise Price”)(without commission or other charge).

Pursuant to this Stock Option Agreement (the “Option Agreement”) and the Stock Option Grant Notice to which this Option Agreement is attached (the “Grant Notice”), theGrant. The Company hereby grants to the Optionee underOptionee, as of the Plan an OptionDate of Grant, the right and option (this “Option”) to purchase the number of Shares indicated inshares of the Grant Notice atCompany’s Common Stock (the “Shares”) for the exercise price per share (the “Exercise Price”), all as set forth inbelow. Such Option shall vest and terminate according to the vesting schedule and term information described below. All terms of this Stock Option Grant Notice (the “Exercise Price”).Agreement shall be subject to the terms and conditions of the 2005 Long-Term Incentive Plan:

PursuantThe Administrator has determined that it is to this Stock Option Agreement (the “Option Agreement”)the advantage and the Stock Option Grant Notice to which this Option Agreement is attached (the “Grant Notice”),best interest of the Company hereby grantsto grant to the Optionee under the Plan an Optionoption to purchase the number of Shares indicated in(the “Shares”) set forth on the Grant NoticeNotice, at the exercise price per shareShare set forth inon the Grant NoticeNotice, and in all respects subject to the terms, definitions and provisions of this Agreement (the “Exercise Price”“Option”).

Pursuant to this Stock Option Agreement (the “Option Agreement”) andThis agreement evidences the Stock Option Grant Notice to which this Option Agreement is attachedgrant by the Company, on the grant date (the “Grant Notice”Date”) set forth in the Notice of Grant that forms part of this agreement (the “Notice of Grant”), the Company hereby grants to the Optionee underParticipant of an option to purchase, in whole or in part, on the terms provided herein and in the Company’s 2018 Equity Incentive Plan an Option to purchase(the “Plan”), the number of Shares indicatedset forth in the Notice of Grant Noticeof common stock, $0.001 par value per share, of the Company (“Common Stock”), at the exercise price per shareShare set forth in the Notice of Grant. Unless earlier terminated, this option shall expire at 5:00 p.m., Eastern time, on the Final Exercise Date set forth in the Notice of Grant Notice (the “Exercise Price”“Final Exercise Date”).

Pursuant to this Stock Option Agreement (the “Option Agreement”) and the Stock Option Grant Notice to which this Option Agreement is attached (the “Grant Notice”), theGrant; Type of Option. The Company hereby grants to the Optionee under the Plan an Optionoption (the “Option”) to purchase the total number of shares of Common Stock of the Company equal to the number of Option Shares indicated in the Grant Noticeset forth above, at the exercise price per shareExercise Price set forth inabove. The Option is being granted pursuant to the Grant Noticeterms of the ​ 2017 Equity Incentive Plan (the “Exercise Price”“Plan”). The Option is intended to be a Non-qualified Stock Option and not an Incentive Stock Option within the meaning of Section 422 of the Internal Revenue Code.