EXHIBIT A JOINT FILING AGREEMENT

EXHIBIT A

JOINT FILING AGREEMENT

The undersigned hereby agree that the statement on Schedule 13G filed herewith (and any amendments thereto) signed by each of the undersigned shall be filed on behalf of each of the undersigned pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended.

Dated: October 23, 2015

QVT FINANCIAL LP						QVT ASSOCIATES GP LLC
By QVT Financial GP LLC, its General Partner
By:		/s/ Xxxxx Xx				By:		/s/ Xxxxx Xx
Name:		Xxxxx Xx				Name:		Xxxxx Xx
Title:		Managing Member				Title:		Managing Member
By:		/s/ Xxx Xxxxxx				By:		/s/ Xxx Xxxxxx
Name:		Xxx Xxxxxx				Name:		Xxx Xxxxxx
Title:		Authorized Signatory				Title:		Authorized Signatory
QVT FINANCIAL GP LLC
By:		/s/ Xxxxx Xx
Name:		Xxxxx Xx
Title:		Managing Member
By:		/s/ Xxx Xxxxxx
Name:		Xxx Xxxxxx
Title:		Authorized Signatory