Exhibit 99.1

Signatures of Reporting Persons

This Statement on Form 4 is filed by the Reporting Persons listed below.

August 6, 2018

	TRIANGLE PRIVATE HOLDINGS II, LLC

	By:	/s/ Peter Berger
	Name:	Peter Berger
	Title:	Chairman

	TRIANGLE PRIVATE HOLDINGS I, LLC

	By:	/s/ Peter Berger
	Name:	Peter Berger
	Title:	Chairman

	TRIANGLE PRIVATE INVESTMENTS, LLC


	By:	/s/ Peter Berger
	Name:	Peter Berger
	Title:	Chairman

	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/ Peter Berger
	Name:	Peter Berger
	Title:	Managing Member

	SIRIS PARTNERS GP III, L.P.
	By:	Siris GP HoldCo III, LLC, its general partner

	By:	/s/ Peter Berger
	Name:	Peter Berger
	Title:	Managing Member


	SIRIS GP HOLDCO III, LLC

	By:	/s/ Peter Berger
	Name:	Peter Berger
	Title:	Managing Member


	SIRIS CAPITAL GROUP III, L.P.
	By:	Siris Advisor HoldCo III, LLC, its general partner

	By:	/s/ Peter Berger
	Name:	Peter Berger
	Title:	Managing Member


	SIRIS CAPITAL GROUP, LLC
	By:	Siris Advisor HoldCo, LLC, its managing member

	By:	/s/ Peter Berger
	Name:	Peter Berger
	Title:	Managing Member


	SIRIS ADVISOR HOLDCO III, LLC

	By:	/s/ Peter Berger
	Name:	Peter Berger
	Title:	Managing Member


	SIRIS ADVISOR HOLDCO, LLC

	By:	/s/ Peter Berger
	Name:	Peter Berger
	Title:	Managing Member

Siris Advisor HoldCo, LLC 4