5. CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS AND SUPPLIERS	3 Months Ended
Mar. 31, 2022
Risks and Uncertainties [Abstract]
5. CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS AND SUPPLIERS	5. CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS AND SUPPLIERS Concentration of credit risk Financial instruments that potentially subject us to a concentration of credit risk are primarily cash equivalents and investment securities. As of March 31, 2022, our cash and cash equivalents are comprised of operating checking accounts and short-term highly rated money market savings accounts. Our short-term investments are comprised of highly rated corporate bonds and U.S. Treasury securities. Concentration of major customers and suppliers For the three months ended March 31, 2022, one customer accounted for $350,000 in revenue, representing 100% of our total revenue. For the three months ended March 31, 2021, one customer accounted for $479,000 in revenue, representing 100% of our total revenue. Typically, a significant concentration of our components and the products we have sold are manufactured and obtained from single or limited-source suppliers. The loss of any single or limited-source supplier, the failure of any of these suppliers to perform as expected, or the disruption in the supply chain of components from these suppliers could subject us to risks and uncertainties including, but not limited to, increased cost of sales, possible loss of revenues, or significant delays in product development or product deliveries, any of which could adversely affect our financial condition and operating results.

5. CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS AND SUPPLIERS

3 Months Ended

Mar. 31, 2022

5. CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS AND SUPPLIERS

5. CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS AND SUPPLIERS

Concentration of credit risk

Financial instruments that potentially subject us to a concentration of credit risk are primarily cash equivalents and investment securities. As of March 31, 2022, our cash and cash equivalents are comprised of operating checking accounts and short-term highly rated money market savings accounts. Our short-term investments are comprised of highly rated corporate bonds and U.S. Treasury securities.

Concentration of major customers and suppliers

For the three months ended March 31, 2022, one customer accounted for $350,000 in revenue, representing 100% of our total revenue. For the three months ended March 31, 2021, one customer accounted for $479,000 in revenue, representing 100% of our total revenue.

Typically, a significant concentration of our components and the products we have sold are manufactured and obtained from single or limited-source suppliers. The loss of any single or limited-source supplier, the failure of any of these suppliers to perform as expected, or the disruption in the supply chain of components from these suppliers could subject us to risks and uncertainties including, but not limited to, increased cost of sales, possible loss of revenues, or significant delays in product development or product deliveries, any of which could adversely affect our financial condition and operating results.