AGREEMENT

Exhibit 99.1

AGREEMENT

Pursuant to Rule 13d-1(k)(1) promulgated pursuant to the Securities Exchange Act of 1934, as amended, the undersigned agree that the attached Schedule 13G/A is being filed on behalf of each of the undersigned.

Dated: February 14, 2014				VENROCK ASSOCIATES
				By: A General Partner
				By:		/s/    Xxxxx X. Xxxxx
						Authorized Signatory

VENROCK ASSOCIATES II, L.P.
By: A General Partner
By:		/s/    Xxxxx X. Xxxxx
		Authorized Signatory

VENROCK ENTREPRENEURS FUND, L.P.
By its General Partner Venrock Management, LLC
By:		/s/    Xxxxx X. Xxxxx
		Authorized Signatory

VENROCK ASSOCIATES V, L.P. By: Venrock Management V, LLC						VR MANAGEMENT, LLC
		Its General Partner
By:		/s/    Xxxxx X. Xxxxx				By:		/s/    Xxxxx X. Xxxxx
		Authorized Signatory						Authorized Signatory
VENROCK MANAGEMENT V, LLC						VENROCK MANAGEMENT, LLC
By:		/s/    Xxxxx X. Xxxxx				By:		/s/    Xxxxx X. Xxxxx
		Authorized Signatory						Authorized Signatory
VENROCK PARTNERS V, L.P. By: Venrock Partners Management V, LLC						VENROCK HEALTHCARE CAPITAL PARTNERS, L.P. By its General Partner VHCP Management, LLC
		Its General Partner
By:		/s/    Xxxxx X. Xxxxx				By:		/s/    Xxxxx X. Xxxxx
		Authorized Signatory						Authorized Signatory
VENROCK PARTNERS MANAGEMENT V, LLC						VHCP CO-INVESTMENT HOLDINGS, LLC By its Manager VHCP Management, LLC
By:		/s/    Xxxxx X. Xxxxx				By:		/s/    Xxxxx X. Xxxxx
		Authorized Signatory						Authorized Signatory
VHCP MANAGEMENT, LLC
By:		/s/    Xxxxx X. Xxxxx
		Authorized Signatory