EXHIBIT A
Joint Filing Statement
We, the undersigned, hereby express our agreement that the attached Schedule 13G is filed on behalf of each of us.
Date: February 14, 2019
INTERWEST PARTNERS IX, LP
By: InterWest Management Partners IX, LLC, its General Partner
| By: | /s/ Gilbert H. Kliman by Karen A. Wilson, Power of Attorney | |||
| Managing Director |
INTERWEST MANAGEMENT PARTNERS IX, LLC
| By: | /s/ Gilbert H. Kliman by Karen A. Wilson, Power of Attorney | |||
| Managing Director |
| By: | /s/ Gilbert H. Kliman by Karen A. Wilson, Power of Attorney | |||
| Name: | Gilbert H. Kliman |
| By: | /s/ Khaled A. Nasr | |
| Name: | Khaled A. Nasr | |
| By: | /s/ Arnold L. Oronsky | |
| Name: | Arnold L. Oronsky | |
