LIMITED POWER OF ATTORNEY
                                       FOR
                              SECTION 16(a) FILINGS

     Know all by these presents, that the undersigned hereby constitutes and
appoints Melinda Dunn the undersigned's true and lawful attorney-in-fact to:

     (1)  Execute for and on behalf of the undersigned, in the undersigned's
          capacity as an officer, director and/or stockholder of any corporation
          or other person in which an investment fund affiliated with Sequoia
          Capital Operations, LLC makes an investment (each, a "Company"), Forms
          3, 4, and 5 and amendments thereto in accordance with Section 16(a) of
          the Securities Exchange Act of 1934 and the rules thereunder;

     (2)  Do and perform any and all acts for and on behalf of the undersigned
          which may be necessary or desirable to complete and execute any such
          Form 3, 4, or 5 or amendment thereto and timely file such form with
          the United States Securities and Exchange Commission (the "SEC") and
          any stock exchange or similar authority; and

     (3)  Take any other action of any type whatsoever which, in the opinion of
          such attorney-in-fact, may be necessary or desirable in connection
          with the foregoing authority, it being understood that the documents
          executed by such attorney-in-fact on behalf of the undersigned
          pursuant to this Limited Power of Attorney shall be in such form and
          shall contain such terms and conditions as such attorney-in-fact may
          approve.

     The undersigned hereby grants to such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever required,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be
done by virtue of this Limited Power of Attorney and the rights and powers
herein granted. The undersigned acknowledges that the foregoing
attorney-in-fact, in serving in such capacity at the request of the undersigned,
is not assuming, nor is any Company assuming, any of the undersigned's
responsibilities to comply with Section 16 of the Securities Exchange Act of
1934.

     This Limited Power of Attorney shall remain in full force and effect until
the undersigned is no longer required to file Forms 3, 4, and 5 with respect to
any Company, unless earlier revoked by the undersigned in a signed writing
delivered to the foregoing attorney-in-fact. This Limited Power of Attorney may
be filed with the SEC as a confirming statement of the authority granted herein.

     IN WITNESS WHEREOF, the undersigned has caused this Limited Power of
Attorney to be executed as of this 21 day of August, 2009.

/s/ Douglas Leone
-----------------------------------
Name : Douglas Leone


                            LIMITED POWER OF ATTORNEY
                                       FOR
                              SECTION 16(a) FILINGS

     Know all by these present,that the undersigned hereby constitutes and
appoints each of Melinda Dunn, Abigail Livingston and Douglas Leone the
undersigned's true and lawful attorney-in-fact to:

     (1)  Execute for and on behalf of the undersigned,in the undersigned's
          capacity as an officer, director and/or stockholder of any corporation
          or other person in which an investment fund affiliated with SC Israel
          IV GenPar, Ltd. makes an investment (each, a "Company"), Forms 3, 4,
          and 5 and amendments thereto in accordance with Section 16(a) of the
          Securities Exchange Act of 1934 and the rules thereunder;

     (2)  Do and perform any and all acts for and on behalf of the undersigned
          which may be necessary or desirable to complete and execute any such
          Form 3, 4, or 5 or amendment thereto and timely file such form with
          the United States Securities and Exchange Commission (the "SEC") and
          any stock exchange or similar authority; and

     (3)  Take any other action of any type whatsoever which, in the opinion of
          such attorney-in-fact, may be necessary or desirable in connection
          with the foregoing authority, it being understood that the documents
          executed by such attorney-in-fact on behalf of the undersigned
          pursuant to this Limited Power of Attorney shall be in such form and
          shall contain such terms and conditions as such attorney-in-fact may
          approve.

     The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever required,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that each such attorney-in-fact, or any such
attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be
done by virtue of this Limited Power of Attorney and the rights and powers
herein granted. The undersigned acknowledges that the foregoing
attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming, nor is any Company assuming, any of the
undersigned's responsibilities to comply with Section 16 of the Securities
Exchange Act of 1934.

     This Limited Power of Attorney shall remain in full force and effect until
the undersigned is no longer required to file Forms 3, 4, and 5 with respect to
any Company, unless earlier revoked by the undersigned in a signed writing
delivered to the foregoing attorneys-in-fact. This Limited Power of Attorney may
be filed with the SEC as a confirming statement of the authority granted herein.

     IN WITNESS WHEREOF, the undersigned has caused this Limited Power of
Attorney to be executed as of this 22nd day of January, 2015.

By: /s/ Haim Sadger
-----------------------------------
Haim Sadger

                            LIMITED POWER OF ATTORNEY
                                       FOR
                              SECTION 16(a) FILINGS

     Know all by these present,that the undersigned hereby constitutes and
appoints each of Melinda Dunn, Abigail Livingston and Douglas Leone the
undersigned's true and lawful attorney-in-fact to:

     (1)  Execute for and on behalf of the undersigned,in the undersigned's
          capacity as an officer, director and/or stockholder of any corporation
          or other person in which an investment fund affiliated with SC Israel
          IV GenPar, Ltd. makes an investment (each, a "Company"), Forms 3, 4,
          and 5 and amendments thereto in accordance with Section 16(a) of the
          Securities Exchange Act of 1934 and the rules thereunder;

     (2)  Do and perform any and all acts for and on behalf of the undersigned
          which may be necessary or desirable to complete and execute any such
          Form 3, 4, or 5 or amendment thereto and timely file such form with
          the United States Securities and Exchange Commission (the "SEC") and
          any stock exchange or similar authority; and

     (3)  Take any other action of any type whatsoever which, in the opinion of
          such attorney-in-fact, may be necessary or desirable in connection
          with the foregoing authority, it being understood that the documents
          executed by such attorney-in-fact on behalf of the undersigned
          pursuant to this Limited Power of Attorney shall be in such form and
          shall contain such terms and conditions as such attorney-in-fact may
          approve.

     The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever required,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that each such attorney-in-fact, or any such
attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be
done by virtue of this Limited Power of Attorney and the rights and powers
herein granted. The undersigned acknowledges that the foregoing
attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming, nor is any Company assuming, any of the
undersigned's responsibilities to comply with Section 16 of the Securities
Exchange Act of 1934.

     This Limited Power of Attorney shall remain in full force and effect until
the undersigned is no longer required to file Forms 3, 4, and 5 with respect to
any Company, unless earlier revoked by the undersigned in a signed writing
delivered to the foregoing attorneys-in-fact. This Limited Power of Attorney may
be filed with the SEC as a confirming statement of the authority granted herein.

     IN WITNESS WHEREOF, the undersigned has caused this Limited Power of
Attorney to be executed as of this 18th day of January, 2015.

By: /s/ Shmuel Levy
-----------------------------------
Shmuel Levy