Revenue from five licensees constituted approximately 41%, 18%, 12%, 12% and 10%, respectively, of the Company's revenue for the three months ended September 30, 2019.  Revenue from five licensees constituted approximately 43%, 13%, 10%, 10% and 10%, respectively, of the Company's revenue for the nine months ended September 30, 2019. Revenue from one licensee constituted approximately 81% of the Company's revenue for the three months ended September 30, 2018 and revenue from one licensee constituted approximately 58% of the Company's revenue for the nine months ended September 30, 2018. Revenue from the sale of the Company's unsecured claim against Avaya, Inc. constituted approximately 29% of the Company's revenue for the three months ended September 30, 2018.  At September 30, 2019, royalty receivables from five licensees constituted in the aggregate approximately 97% of the Company's royalty receivables.  At December 31, 2018, royalty receivables from four licensees constituted in the aggregate approximately 80% of the Company's royalty receivables.