Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Stock^F1,F2	Nov 8, 2018	J	1,084,127	—	D	1,084,127	I	Directly owned by USVP IX
Common Stock^F1	Nov 8, 2018	J	216,825	—	A	216,825	D
Common Stock^F1	Nov 8, 2018	J	216,825	—	D	0	D
Common Stock^F1,F2	Nov 8, 2018	J	18,212	—	A	18,212	I	Directly owned by Irwin Federman
Common Stock^F1,F2	Nov 8, 2018	J	22,573	—	A	22,573	I	Directly owned by Steven Krausz
Common Stock^F1,F2	Nov 8, 2018	J	15,391	—	A	15,391	I	Directly owned by David Liddle
Common Stock^F1,F2	Nov 8, 2018	J	13,356	—	A	13,356	I	Directly owned by Paul Matteucci
Common Stock^F1,F2	Nov 8, 2018	J	18,982	—	A	18,982	I	Directly owned by Jonathan Root
Common Stock^F1,F2	Nov 8, 2018	J	18,212	—	A	18,212	I	Directly owned by Philip Young

Table II — derivative securities

No Table II lines on this filing.

Explanation of responses

F1Represents a pro-rata, in-kind distribution by U.S. Venture Partners IX, L.P. ("USVP IX"), without additional consideration, to its partners.
F2This report is one of two reports each on a separate Form 4; however, these forms are related to the same transaction being filed by the reporting persons. The shares are held of record by USVP IX. Presidio Management Group IX, LLC ("PMG IX") is the general partner of USVP IX and may be deemed to have sole voting and dispositive power over the shares held by USVP IX. Casey Tansey, a director of the Issuer, and each of Irwin Federman, Steven M. Krausz, David E. Liddle, Paul A. Matteucci, Jonathan D. Root, and Philip M. Young, are managing members of PMG IX, and may be deemed to share voting and dispositive power over the shares held by USVP IX. Such persons and entities disclaim beneficial ownership of shares held by USVP IX, except to the extent of any proportionate pecuniary interest therein.