Note 9 – Significant Customers

Revenue for the three months ended March 31, 2020 and 2019 was $1.9 million and $2.3 million, respectively. Three third-party contract manufacturing customers accounted for 48.6% and 18% and 17.3%, respectively, of our revenue from continuing operations for the three months ended March 31, 2020. Three third-party contract manufacturing customers accounted for 45.7%, 23.9% and 12.3%, respectively, of our revenue from continuing operations for the three months ended March 31, 2019. The loss of sales to any of these large third-party contract manufacturing customers could have a material adverse effect on our business operations and financial condition.

We are subject to account receivable credit concentrations from time-to-time as a consequence of the timing, payment pattern and ultimate purchase volumes or shipping schedules with our customers. These concentrations may impact our overall exposure to credit risk, either positively or negatively, in that our customers may be similarly affected by changes in economic, regulatory or other conditions that may impact the timing and collectability of amounts due to us. Four customers represented 49%, 18%, 12%, and 11% of our total trade receivable balances at March 31, 2020 and three customers represented 70%, 14% and 11% of our total trade receivable balances at December 31, 2019.