Form: SC 13G/A

Statement of Beneficial Ownership by Certain Investors

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 8, 2019

INTERWEST PARTNERS X, LP

By:    InterWest Management Partners X, LLC, its General Partner   
By:   

/s/ Gilbert H. Kliman by Karen A. Wilson, Power of Attorney

  
   Managing Director   

INTERWEST MANAGEMENT PARTNERS X, LLC

 

By:   

/s/ Gilbert H. Kliman by Karen A. Wilson, Power of Attorney

  
   Managing Director   
By:   

/s/ Keval Desai by Karen A. Wilson, Power of Attorney

  
Name:    Keval Desai   
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