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 12, 2016

By:	/s/ Harvey B. Cash
Name:	Harvey B. Cash
By:	/s/ Philip T. Gianos
Name:	Philip T. Gianos
By:	/s/ W. Stephen Holmes
Name:	W. Stephen Holmes III
By:	/s/ Gilbert H. Kliman
Name:	Gilbert H. Kliman
By:	/s/ Arnold L. Oronsky
Name:	Arnold L. Oronsky

INTERWEST PARTNERS VII, LP
By:	InterWest Management Partners VII, LLC
	its General Partner
	By:	/s/ Gilbert H. Kliman
		Managing Director
INTERWEST INVESTORS VII, LP
By:	InterWest Management Partners VII, LLC
	its General Partner
	By:	/s/ Gilbert H. Kliman
		Managing Director

INTERWEST MANAGEMENT PARTNERS VII, LLC
By:	/s/ Gilbert H. Kliman
	Managing Director
INTERWEST VENTURE MANAGEMENT COMPANY
By:	/s/ Gilbert H. Kliman
	Secretary