POWER OF ATTORNEY

	Know all by these presents, that the undersigned hereby constitutes and
appoints Sandy Macrae, Stephane Boissell, Denise Winn, Matthew Colvin and Ron A.
Metzger of Cooley LLP, counsel to the Company, with full power of substitution,
the undersigned's true and lawful attorney-in-fact to:

1.	execute for and on behalf of the undersigned, for and on behalf of the
undersigned, in the undersigned's capacity as an officer or director, as the
case may be, of the Company, Forms 3, 4 and 5 (and any amendments thereto) in
accordance with Section 16(a) of the Securities Exchange Act of 1934, as
amended, (the "Exchange Act") filings;and the rules thereunder;

3.	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,
complete and execute any amendments thereto, and timely file such form with the
U.S. Securities and Exchange Commission (the "SEC") and any securities exchange
or similar authority, including without limitation the filing of a Form ID or
any other documents necessary or appropriate to enable the undersigned to file
the Forms 3, 4 and 5 electronically with the SEC;

4.	seek or obtain, as the undersigned's representative and on the undersigned's
behalf, information on transactions in the Company's securities from any broker
or financial institution, and the undersigned hereby authorizes any such person
to release any such information to each of the undersigned's attorneys-in-fact
appointed by this Power of Attorney and approves and ratifies any such release
of information; and

5.	take any other action 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 or for, 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
information and disclosure as such attorney-in-fact may approve in such
attorney-in-fact's discretion.

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 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 attorneys-in-fact, in serving in
such capacity at the request and on the behalf of the undersigned, are not
assuming, nor is the Company assuming, any of the undersigned's responsibilities
to comply with, or any liability for the failure to comply with, any provision
of Section 16 of the Exchange Act.

This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4 or 5 with respect to the
undersigned's holdings of and transactions in securities issued by the Company,
unless earlier revoked by the undersigned in a signed writing delivered to each
of the foregoing attorneys-in-fact.

	IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 17th day of June 2019.



		Signature:
                /s/ Prathyusha Duraibabu
                Prathyusha Duraibabu