EXHIBIT A JOINT FILING AGREEMENT

EXHIBIT A

JOINT FILING AGREEMENT

The undersigned acknowledge and agree that the foregoing Statement on Schedule 13D is filed on behalf of each of the undersigned and that all subsequent amendments to this Statement on Schedule 13D shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning it contained therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that it knows or has reason to believe that such information is inaccurate. This agreement may be executed in any number of counterparts and all of such counterparts taken together shall constitute one and the same instrument.

Date: June 7, 2010		GCP VRC Ltd.
		By: Title:		/s/ Xxxx Xxxxxxx Director
Date: June 7, 2010		GCP II VRC Ltd.
		By: Title:		/s/ Xxxx Xxxxxxx Director
Date: June 7, 2010		Generation Members’ Fund II LP
		By: Title:		/s/ Xxxx Xxxxxxx Managing Member of its General Partner,
				Generation Partners II LLC
Date: June 7, 2010		Generation Capital Partners II LP
		By: Title:		/s/ Xxxx Xxxxxxx Managing Member of its General Partner,
				Generation Partners II LLC
Date: June 7, 2010		Generation Capital Partners VRC LP
		By: Title:		/s/ Xxxx Xxxxxxx Managing Member of its General Partner,
				Generation Partners VRC LLC
Date: June 7, 2010		Xxxx X. Xxxxxxxx
		By: Title:		/s/ Xxxx X. Xxxxxxxx Self
Date: June 7, 2010		Xxxx Xxxxxxx
		By: Title:		/s/ Xxxx Xxxxxxx Self