POWER OF ATTORNEY
Know all by these presents that the undersigned hereby constitutes and appoints
each of Thomas Looby, Max Scheder-Bieschin, Erin Anderman and Thomas Powers,
signing singly, as 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 a beneficial owner, joint actor, or similar capacity of securities
which are registered under or subject to the laws, rules or regulations of any
jurisdiction, any form, schedule, report, press release or other similar
document as may be required by such jurisdiction's laws, rules or regulations,
and any amendments thereto, in accordance with such jurisdiction's laws, rules
or regulations, including without limitation Forms 3, 4 and 5 in accordance with
Section 16(a) of the Securities Exchange Act of 1934 (the 'Exchange Act') and
the rules thereunder, Schedule 13D or 13G in accordance with Section 13(d) of
the Exchange Act and the rules thereunder and a Form ID, Uniform Application for
Access Codes to File on Edgar;
(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,
schedule, report, press release or other similar document, and timely file such
form, schedule, report, press release or other similar document with the
appropriate governmental authority or regulatory body of the relevant
jurisdiction and any stock exchange or similar authority; and
(3) 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, 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 each 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 attorneys-in-fact, in
serving in such capacity at the request of the undersigned, are not assuming any
of the undersigned's responsibilities to comply with the securities laws, rules
or regulations of any particular jurisdiction.
This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file forms, schedules, press releases or
similar documents with respect to the undersigned's holdings of and transactions
in securities which are registered under the laws, rules or regulations of any
jurisdiction, unless earlier revoked by the undersigned in a signed writing
delivered to the foregoing attorneys-in-fact.
IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 21st day of September, 2017.
Signature: /s/ Theodore T. Wang
Theodore T. Wang
