Revenue from three licensees constituted approximately 41%, 18% and 12% of the Company's revenue for the three months ended June 30, 2018 and revenue from one licensee constituted approximately 64% of the Company's revenue for the six months ended June 30, 2018.  Revenue from the sale of the Company's unsecured claim against Avaya, Inc. constituted approximately 32% of the Company's revenue for the six months ended June 30, 2018.  Revenue from two licensees constituted approximately 47% and 26% of the Company's revenue for the three months ended June 30, 2017.  Revenue from two licensees constituted approximately 55% and 21% of the Company's revenue for the six months ended June 30, 2017.  At June 30, 2018, royalty receivables from four licensees constituted in the aggregate approximately 84% of the Company's royalty receivables.  At December 31, 2017, royalty receivables from three licensees constituted in the aggregate approximately 79% of the Company's royalty receivables.