Financial instruments and related items, which potentially subject the Company to concentrations of credit risk, consist primarily of cash and trade receivables. The Company places its cash and temporary cash investments with high credit quality institutions. At times, such investments may be in excess of the FDIC insurance limit.

The Company’s revenues earned from sale of products and services for the three months ended September 30, 2020 included 30% and 68% (aggregate of 98%) from two customers of the Company’s total revenues.

The Company’s revenues earned from sale of products and services for the nine months ended September 30, 2020 included 26% and 60% (aggregate of 86%) from two customers of the Company’s total revenues.

The Company’s revenues earned from sale of products and services for the three months ended September 30, 2019 included 43%, 20%, and 19% (aggregate of 82%) from three customers of the Company’s total revenues.

The Company’s revenues earned from sale of products and services for the nine months ended September 30, 2019 included 34%, 23%, 16%, and 15% (aggregate of 88%) from four customers of the Company’s total revenues.

At September 30, 2020, there was no balance of the Company’s total accounts receivable, and one customer accounted for 100% of the Company’s total accounts receivable with an amount of $750 at December 31, 2019.