JOINT FILING AGREEMENT

Exhibit 99.1

JOINT FILING AGREEMENT

The undersigned hereby agree that they are filing this statement on Schedule 13D, and may file any amendments thereto, jointly pursuant to Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended. Each of them is responsible for the timely filing of such Schedule 13D and any amendments thereto, and for the completeness and accuracy of the information concerning such person contained herein or therein; but none of them is responsible for the completeness or accuracy of the information concerning the others, unless such person knows or has reason to believe that such information is inaccurate.

This Joint Filing Agreement shall be included as an exhibit to such Schedule 13D.

Dated: May 5, 2017

SILVER PRIVATE HOLDINGS I, LLC
By:		Silver Private Investments, LLC, its sole member
By:		/s/ Xxxxx Xxxxxx
		Name:		Xxxxx Xxxxxx
		Title:		Authorized Signatory
SILVER PRIVATE INVESTMENTS, LLC
By:		/s/ Xxxxx Xxxxxx
		Name:		Xxxxx Xxxxxx
		Title:		Authorized Signatory
SIRIS PARTNERS III, L.P.
SIRIS PARTNERS III PARALLEL, L.P.
By:		Siris Partners GP III, L.P., its general partner
By:		Siris GP HoldCo III, LLC, its general partner
By:		/s/ Xxxxx Xxxxxx
		Name:		Xxxxx Xxxxxx
		Title:		Managing Member
SIRIS PARTNERS GP III, L.P.
By:		Siris GP HoldCo III, LLC, its general partner
By:		/s/ Xxxxx Xxxxxx
		Name:		Xxxxx Xxxxxx
		Title:		Managing Member

SIRIS GP HOLDCO III, LLC
By:		/s/ Xxxxx Xxxxxx
		Name:		Xxxxx Xxxxxx
		Title:		Managing Member
SIRIS CAPITAL GROUP III, L.P.
By:		Siris Advisor HoldCo III, LLC, its general partner
By:		/s/ Xxxxx Xxxxxx
		Name:		Xxxxx Xxxxxx
		Title:		Managing Member
SIRIS CAPITAL GROUP, LLC
By:		Siris Advisor HoldCo, LLC, its managing member
By:		/s/ Xxxxx Xxxxxx
		Name:		Xxxxx Xxxxxx
		Title:		Managing Member
SIRIS ADVISOR HOLDCO III, LLC
By:		/s/ Xxxxx Xxxxxx
		Name:		Xxxxx Xxxxxx
		Title:		Managing Member
SIRIS ADVISOR HOLDCO, LLC
By:		/s/ Xxxxx Xxxxxx
		Name:		Xxxxx Xxxxxx
		Title:		Managing Member