Exhibit 99.1

Signatures of Reporting Persons

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

July 2, 2019

		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 Group GP, LLC, its general partner

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

		SIRIS CAPITAL GROUP, LLC
		By:	Siris Group GP, LLC, its managing member

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

		SIRIS GROUP GP, LLC

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

Triangle Private Holdings II, LLC 4