BENCHMARK

                               POWER OF ATTORNEY


KNOW ALL MEN BY THESE PRESENTS, that each entity listed on Schedule A attached
hereto (each a "Granting Entity," and collectively the "Granting Entities") and
each person listed on Schedule B attached hereto (each, a "Granting Equity
Holder" and collectively, the "Granting Equity Holders"), hereby constitutes and
appoints AN-YEN E. HU its true and lawful attorney-in-fact (the "Attorney-in-
Fact") to act for and on behalf of such person in its own capacity and in its
capacity as a manager, member, general partner or similar control person
("Control Person") of any other Granting Entity to:

  a.  execute contracts, agreements, instruments, certificates and documents
      that arise in the ordinary course of business on behalf of such person in
      its own capacity and in its capacity as a Control Person in accordance
      with and subject to the provisions of the relevant governing documents of
      such person and applicable law, including, but not limited to, stock
      powers, stock purchase agreements, voting agreements, co-sale agreements,
      investor rights agreements, management rights agreements, proxies,
      ballots, indemnification agreements, waivers, stockholder written consents
      or amendments or modifications to any of the foregoing, and documents
      related to opening and maintaining bank and brokerage accounts;

  b.  execute, individually or jointly with any other reporting persons, any and
      all reports, notices, communications and other documents (including, but
      not limited to, reports or filings on Form ADV, Form D, Schedule 13D,
      Schedule 13G, Form 13-F, Form 13H, Form 3, Form 4, Form 5 and any
      applicable  registration statements) that such Granting Entity or Granting
      Equity Holder may be required to file with any foreign or domestic
      regulatory authority, including, but not limited to, the United States
      Securities and Exchange Commission pursuant to the Securities Act of 1933,
      the Securities Exchange Act of 1934, the Investment Company Act of 1940 or
      the Investment Advisers Act of 1940, each as amended and with the
      implementing rules and regulations thereto (collectively, the "Reports")
      with respect to such person's (i) status as an officer, member or director
      of, or (ii) ownership of, or transactions in, securities of, any entity
      whose securities are beneficially owned (directly or indirectly) by such
      person;

  c.  do and perform any and all acts for and on behalf of such Granting Entity
      or Granting Equity Holder that may be necessary or desirable to complete
      and execute any such Reports and timely file such forms, reports, notices
      and schedules with the United States Securities and Exchange Commission
      and any stock exchange or other domestic or foreign authority; and

  d.  take any other action of any type whatsoever in connection with the
      foregoing which, in the opinion of such attorney-in-fact, may be of
      benefit to, in the best interest of, or legally required by, such Granting
      Entity or Granting Equity Holder, it being understood that the documents
      executed by such attorney-in-fact on behalf of such person, pursuant to
      this Power of Attorney, shall be in such form and shall contain such terms
      and conditions as such attorney-in-fact may approve in his discretion.

      Each Granting Entity and Granting Equity Holder hereby grants to such
attorney-in-fact full power and authority to do and perform all and every act
and thing whatsoever requisite, necessary, and proper to be done in the exercise
of any of the rights and powers herein granted, as fully to all intents and
purposes as such person might or could do if personally present, with full power
of revocation, hereby ratifying and confirming all that such attorney-in-fact,
or his substitute or substitutes, shall lawfully do or cause to be done by
virtue of this Power of Attorney and the rights and powers herein granted.  Each
Granting Entity and Granting Equity Holder acknowledges that no such attorney-
in-fact, in serving in such capacity at the request of such person, is hereby
assuming, nor is any other Granting Entity or Granting Equity Holder hereby
assuming, any of such person's responsibilities to comply with Section 16 or
Section 13 of the Securities Exchange Act of 1934 or otherwise.

      One or more additional Granting Entities or Granting Equity Holders may
become a party to this Power of Attorney after the date hereof without the
consent of any of the other parties hereto by executing a counterpart to this
Power of Attorney.  Schedule A and Schedule B shall be amended from time to time
by the attorney-in-fact to reflect the addition or removal of any Granting
Entity or Granting Equity Holder.

      This Power of Attorney shall remain in full force and effect with respect
to a Granting Entity or a Granting Equity Holder until the delivery by such
Granting Entity or Granting Equity Holder to the Attorney-in-Fact at his last
known business address of a written revocation, in whole or in part, of this
Power of Attorney.



                            [Remainder of page left blank]



IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed effective as of July 13, 2020.

                    GRANTING ENTITIES


                            BENCHMARK CAPITAL MANAGEMENT CO. VIII, L.L.C.

                            By: /s/ Steven M. Spurlock
                               ---------------------------------------
                            Name: Steven M. Spurlock
                            Title: Managing Member

                            BENCHMARK CAPITAL PARTNERS VIII, L.P.
                            By: Benchmark Capital Management Co. VIII, L.L.C.,
                                its general partner

                            By: /s/ Steven M. Spurlock
                               ---------------------------------------
                            Name: Steven M. Spurlock
                            Title: Managing Member

                            BENCHMARK FOUNDERS' FUND VIII, L.P.
                            By: Benchmark Capital Management Co. VIII, L.L.C.,
                                its general partner

                            By: /s/ Steven M. Spurlock
                               ---------------------------------------
                            Name: Steven M. Spurlock
                            Title: Managing Member

                            BENCHMARK FOUNDERS' FUND VIII-B, L.P.
                            By: Benchmark Capital Management Co. VIII, L.L.C.,
                                its general partner

                            By: /s/ Steven M. Spurlock
                               ---------------------------------------
                            Name: Steven M. Spurlock
                            Title: Managing Member



                            GRANTING EQUITY HOLDERS


                            By:   /s/ Matthew R. Cohler
                               ---------------------------------------
                                  Matthew R. Cohler

			    By:   /s/ Peter H. Fenton
                               ---------------------------------------
                                  Peter H. Fenton

                            By:   /s/ J. William Gurley
                               ---------------------------------------
                                  J. William Gurley

                            By:   /s/ Mitchell H. Lasky
                               ---------------------------------------
                                  Mitchell H. Lasky

                            By:   /s/ Chetan Puttagunta
                               ---------------------------------------
                                  Chetan Puttagunta

                            By:   /s/ Steven M. Spurlock
                               ---------------------------------------
                                  Steven M. Spurlock

                            By:   /s/ Sarah E. Tavel
                               ---------------------------------------
                                  Sarah E. Tavel

                            By:   /s/ Eric H. Vishria
                               ---------------------------------------
                                  Eric H. Vishria



                              SCHEDULE A

                               GRANTING ENTITIES


BENCHMARK CAPITAL MANAGEMENT CO. VIII, L.L.C.

BENCHMARK CAPITAL PARTNERS VIII, L.P.

BENCHMARK FOUNDERS' FUND VIII, L.P.

BENCHMARK FOUNDERS' FUND VIII-B, L.P.



                                   SCHEDULE B

                            GRANTING EQUITY HOLDERS

Matthew R. Cohler

Peter H. Fenton

J. William Gurley

Mitchell H. Lasky

Chetan Puttagunta

Steven M. Spurlock

Sarah E. Tavel

Eric H. Vishria