JOINT FILING AGREEMENT

Exhibit 1

JOINT FILING AGREEMENT

This agreement is made pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended (the “Act”) by and among the parties listed below, each referred to herein as a “Joint Filer.” The Joint Filers agree that a statement of beneficial ownership as required by Section 13(d) of the Act and the Rules thereunder may be filed on each of their behalf on Schedule 13D or Schedule 13G, as appropriate, and that said joint filing may thereafter be amended by further joint filings. The Joint Filers state that they each satisfy the requirements for making a joint filing under Rule 13d-1.

Dated: November 26, 2014

VECTOR CH HOLDINGS (CAYMAN), L.P.						VECTOR ENTREPRENEUR FUND III, L.P.
By:		VECTOR CAPITAL PARTNERS IV, L.P., its general partner				By:		VECTOR CAPITAL PARTNERS III, L.P., its general partner
By:		VECTOR CAPITAL, L.L.C., its general partner				By:		VECTOR CAPITAL, L.L.C., its general partner
By:		/s/ Xxxxx Xxxxxx				By:		/s/ Xxxxx Xxxxxx
Name:		Xxxxx Xxxxxx				Name:		Xxxxx Xxxxxx
Title:		Chief Operating Officer				Title:		Chief Operating Officer
By:		VECTOR CAPITAL, LTD., its general partner				By:		VECTOR CAPITAL, L.T.D., its general partner
By:		/s/ Xxxxx Xxxxxx				By:		/s/ Xxxxx Xxxxxx
Name:		Xxxxx Xxxxxx				Name:		Xxxxx Xxxxxx
Title:		Director				Title:		Director
CH MERGER SUB, INC.						VECTOR CAPITAL PARTNERS III, L.P.
By:		/s/ Xxxxx Xxxxxx				By:		VECTOR CAPITAL, L.L.C., its general partner
Name:		Xxxxx Xxxxxx
Title:		President				By:		/s/ Xxxxx Xxxxxx
						Name:		Xxxxx Xxxxxx
VECTOR CAPITAL IV INTERNATIONAL, L.P.						Title:		Chief Operating Officer
By:		VECTOR CAPITAL PARTNERS IV, L.P., its general partner				By:		VECTOR CAPITAL, LTD., its general partner
By:		VECTOR CAPITAL, L.L.C., its general partner				By:		/s/ Xxxxx Xxxxxx
						Name:		Xxxxx Xxxxxx
By:		/s/ Xxxxx Xxxxxx				Title:		Director
Name:		Xxxxx Xxxxxx
Title:		Chief Operating Officer
By:		VECTOR CAPITAL, LTD., its general partner
By:		/s/ Xxxxx Xxxxxx
Name:		Xxxxx Xxxxxx
Title:		Director

VECTOR CAPITAL PARTNERS IV, L.P.
By:		VECTOR CAPITAL, L.L.C., its general partner
By:		/s/ Xxxxx Xxxxxx
Name:		Xxxxx Xxxxxx
Title:		Chief Operating Officer
By:		VECTOR CAPITAL, LTD., its general partner
By:		/s/ Xxxxx Xxxxxx
Name:		Xxxxx Xxxxxx
Title:		Director
VECTOR CAPITAL, L.L.C.
By:		/s/ Xxxxx Xxxxxx
Name:		Xxxxx Xxxxxx
Title:		Chief Operating Officer
VECTOR CAPITAL, LTD.
By:		/s/ Xxxxx Xxxxxx
Name:		Xxxxx Xxxxxx
Title:		Director
XXXXXXXXX X. XXXXXX
/s/ Xxxxxxxxx X. Xxxxxx Xxxxxxxxx X. Xxxxxx