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: August 31, 2018
INTERWEST PARTNERS IX, LP
By: InterWest Management Partners IX, LLC, its General Partner
| By: | /s/ Gilbert H. Kliman | |
| Managing Director | ||
| INTERWEST MANAGEMENT PARTNERS IX, LLC | ||
| By: | /s/ Gilbert H. Kliman | |
| Managing Director | ||
| By: | /s/ Gilbert H. Kliman | |
| Name: | Gilbert H. Kliman | |
| By: | /s/ Khaled A. Nasr | |
| Name: | Khaled A. Nasr | |
| By: | /s/ Arnold L. Oronsky | |
| Name: | Arnold L. Oronsky | |