EXHIBIT A

JOINT FILING STATEMENT

We, the undersigned, hereby express our agreement that the attached Schedule 13G (or any amendments thereto) relating to the Common Stock of ServiceSource International, Inc. is filed on behalf of each of us.

Dated: January 10, 2019

Housatonic Micro Fund SBIC, L.P.
By:	Housatonic Micro Partners SBIC, L.L.C.
Its:	General Partner
By:	/s/ Barry D. Reynolds
	Barry D. Reynolds, Manager
Housatonic Micro Partners SBIC, L.L.C.
By:	/s/ Barry D. Reynolds
	Barry D. Reynolds, Manager
Housatonic Equity Investors IV, L.P.
By:	Housatonic Equity Partners IV, L.L.C.
Its:	General Partner
By:	/s/ Barry D. Reynolds
	Barry D. Reynolds, Manager
Housatonic Equity Affiliates IV, L.P.
By:	Housatonic Equity Partners IV, L.L.C.
Its:	General Partner
By:	/s/ Barry D. Reynolds
	Barry D. Reynolds, Manager
Housatonic Equity Partners IV, L.L.C.
By:	/s/ Barry D. Reynolds
	Barry D. Reynolds, Manager