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, 2018
INTERWEST PARTNERS X, LP
By: InterWest Management Partners X, LLC, its General Partner
| By: | /s/ Gilbert H. Kliman | |
| Managing Director |
INTERWEST MANAGEMENT PARTNERS X, LLC
| By: | /s/ Gilbert H. Kliman | |
| Managing Director |
| By: | /s/ Keval Desai | |
| Name: | Keval Desai |
| By: | /s/ Philip T. Gianos | |
| Name: | Philip T. Gianos |
| By: | /s/ W. Stephen Holmes by Karen A. Wilson, Power of Attorney | |
| Name: | W. Stephen Holmes |
| 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 |
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