Exhibit 24

                               POWER OF ATTORNEY

     KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints Travis Boettner, the undersigned's true and lawful attorney-in-fact and
agent to:

     (i) prepare, execute and file, for and on behalf of the undersigned, any
     and all documents and filings that are required or advisable to be made
     with the United States Securities and Exchange Commission, any stock
     exchange or similar authority, under the Securities Exchange Act of 1934,
     as amended (the "Exchange Act"), and the rules and regulations promulgated
     thereunder, including without limitation (a) any Joint Filing Agreement
     under Rule 13d-1(k) of the Exchange Act (or any successor provision
     thereunder), Schedule 13D and Schedule 13G (or any successor schedules or
     forms adopted under the Exchange Act) and any amendments thereto in
     accordance with Section 13 of the Exchange Act and the rules thereunder,
     and (b) Forms 3, 4 and 5 and any amendments thereto in accordance with
     Section 16(a) of the Exchange Act and the rules thereunder; and

     (i) take any other action of any nature whatsoever in connection with the
     foregoing which, in the opinion of such attorney-in-fact, may be of
     benefit, in the best interest of, or legally required by, the undersigned,
     it being understood that the documents executed by such attorney-in-fact
     on behalf of the undersigned 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 such attorney-in-fact's discretion.

     The undersigned hereby grants to such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
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 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 any
of the undersigned's responsibilities to comply with the Exchange Act, including
without limitation Sections 13 and 16 of the Exchange Act.

     This Power of Attorney shall remain in full force and effect until the
earliest to occur of (a) the undersigned is no longer required to file any form
or document with respect to the undersigned's holdings of and transactions in
securities issued by a company, (b) revocation by the undersigned in a signed
writing delivered to the foregoing attorney-in-fact or (c) until such attorney-
in-fact's resignation or the termination of such attorney-in-fact's position as
Chief Financial Officer of LSV Capital Management, LLC.

     IN WITNESS WHEREOF, the undersigned has cause this Power of Attorney to be
executed as of July 16, 2020.

Lightstone Ventures, L.P.                    Lightstone Ventures II, L.P.

By:  LSV Associates, LLC                     By:  LSV Associates II, LLC
Its: General Partner                         Its: General Partner


By:  /s/ Michael A. Carusi                   By:  /s/ Michael A. Carusi
     ---------------------                        ---------------------
Name:  Michael A. Carusi                     Name:  Michael A. Carusi
Title: Managing Director                     Title: Managing Director


Lightstone Ventures (A), L.P.                Lightstone Ventures II (A), L.P.

By:  LSV Associates, LLC                     By:    LSV Associates II, LLC
Its: General Partner                         Its:   General Partner


By:  /s/ Michael A. Carusi                   By:  /s/ Michael A. Carusi
     ---------------------                        ---------------------
Name:  Michael A. Carusi                     Name:  Michael A. Carusi
Title: Managing Director                     Title: Managing Director


LSV Associates, LLC                          LSV Associates II, LLC


By:  /s/ Michael A. Carusi                   By:  /s/ Michael A. Carusi
     ---------------------                        ---------------------
Name:  Michael A. Carusi                     Name:  Michael A. Carusi
Title: Managing Director                     Title: Managing Director


By:  /s/ Michael A. Carusi                   By :  /s/ Jean M. George
     ---------------------                         ------------------
Name:  Michael A. Carusi                     Name:  Jean M. George


By:  /s/ Henry A. Plain, Jr.
     -----------------------
Name:  Henry A. Plain, Jr.