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Significant Customers, Concentrations of Credit Risk and Geographic Information | 12 Months Ended
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Dec. 31, 2020
Significant Customers, Concentrations of Credit Risk and Geographic Information |
Significant Customers, Concentrations of Credit Risk and Geographic Information | Note 6 ‑ Significant Customers, Concentrations of Credit Risk and Geographic Information We manage and operate our business through one operating segment. Net revenues from customers equal to, or greater than, 10% of total net revenues are as follows:
|  | Year ended December 31, |
|  | 2020 |  | 2019 |
Customer A |  | 17 | % | <10 | %
Customer B |  | 16 | % | 37 | %
Customer C |  | 12 | % | 10 | %
Customer D |  | <10 | % | 10 | %
Net revenues by geographic area are as follows:
|  | Year ended December 31,
|  | 2020 |  | 2019
|  | (in thousands)
United States |  | $ | 2,832 |  | $ | 3,726
Asia and Middle East |  |  | 3,575 |  |  | 2,949
Europe and other |  |  | 481 |  |  | 630
Revenue, net |  | $ | 6,888 |  | $ | 7,305
Revenues by geographic area are based on the country of shipment destination. The geographic location of distributors and third-party manufacturing service providers may be different from the geographic location of the purchasers and/or ultimate end users. We provide credit only to creditworthy third parties who are subject to our credit verification procedures. Accounts receivable balances are monitored on an ongoing basis, and accounts deemed to have credit risk are fully reserved. At December 31, 2020, two customers accounted for 47% and 22% of total accounts receivable. At December 31, 2019, four customers accounted for 29%, 20%, 11% and 11% of total accounts receivable. Our allowance for doubtful accounts was $0 at both December 31, 2020 and 2019. As of December 31, 2020, our long-lived assets were geographically located as follows:
|  | December 31, |  | December 31,
|  | 2020 |  | 2019
|  | (in thousands)
United States |  | $ | 1,194 |  | $ | 648
Asia |  |  | 332 |  |  | 853
Total long-lived assets |  | $ | 1,526 |  | $ | 1,501

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- Definition The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -URI http://asc.fasb.org/topic&trid=2134479 + Details
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