Security	Date	Code	Shares	Price	A/D	Owned after	D/I
Common Stock^F1,F2	Oct 12, 2016	C	1,615,041	—	A	1,615,041	D
Common Stock^F3,F2	Oct 12, 2016	C	464,494	—	A	2,079,535	D
Common Stock^F4,F2	Oct 12, 2016	C	373,803	—	A	2,453,338	D

Table II — derivative securities

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	D/I
Series C Preferred Stock^F1,F2	—	Oct 12, 2016	C	1,615,041	D	—	—	Common Stock	1,615,041	D
Series D Preferred Stock^F3,F2	—	Oct 12, 2016	C	464,494	D	—	—	Common Stock	464,494	D
Series E Preferred Stock^F4,F2	—	Oct 12, 2016	C	373,803	D	—	—	Common Stock	373,803	D

Explanation of responses

F1Each share of the issuer's Series C Preferred Stock automatically converted into 1 share of the issuer's Common Stock on October 12, 2016 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering (the "IPO") pursuant to a registration statement on Form S-1 (File No. 333-213551) under the Securities Act of 1933, as amended (the "Registration Statement"), and had no expiration date.
F2These securities are held of record by InterWest Partners X, L.P. ("IW10"). InterWest Management Partners X, LLC ("IMP10") is the general partner of IW10. Philip T. Gianos, W. Stephen Holmes, Gilbert H. Kliman and Arnold L. Oronsky are the managing directors of IMP10, and Keval Desai and Khalad A. Nasr are venture members of IMP10. Each of the reporting persons disclaims beneficial ownership of the securities reported herein for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of its or his pecuniary interest therein, if any. The reporting persons have designated a representative, currently Doug Fisher, a consultant of InterWest Venture Management Co., to serve on the issuer's board of directors. This report shall not be deemed an admission that any of the reporting persons is a beneficial owner of such securities for the purposes of Section 16 of the Exchange Act, or for any other purposes.
F3Each share of the issuer's Series D Preferred Stock automatically converted into 1 share of the issuer's Common Stock on October 12, 2016 in connection with the closing of the issuer's sale of its Common Stock in its IPO pursuant to the Registration Statement, and had no expiration date.
F4Each share of the issuer's Series E Preferred Stock automatically converted into 1 share of the issuer's Common Stock on October 12, 2016 in connection with the closing of the issuer's sale of its Common Stock in its IPO pursuant to the Registration Statement, and had no expiration date.