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Significant Customers, Concentrations of Credit Risk and Geographic Information (Tables) | 12 Months Ended
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Dec. 31, 2021
Significant Customers, Concentrations of Credit Risk and Geographic Information |
Schedule of net revenues from customers | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31, |
​ |  | 2021 |  | 2020 |
Customer A |  | 17 | % | 17 | %
Customer B |  | 15 | % | 16 | %
Customer C |  | 15 | % | 12 | %
Schedule of net revenues by geographical area | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
​ |  | 2021 |  | 2020
​ |  | (in thousands)
United States | ​ | $ | 2,185 | ​ | $ | 2,832
Asia and Middle East | ​ |  | 4,724 | ​ |  | 3,575
Europe and other | ​ |  | 569 | ​ |  | 481
Revenue, net | ​ | $ | 7,478 | ​ | $ | 6,888
Schedule of assets by geographical area | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31,
​ |  | 2021 |  | 2020
​ |  | (in thousands)
United States | ​ | $ | 536 | ​ | $ | 1,194
Asia | ​ |  | 176 | ​ |  | 332
Total long-lived assets | ​ | $ | 712 | ​ | $ | 1,526

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