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Significant Customers, Concentrations of Credit Risk, and Geographic Information (Tables) | 6 Months Ended
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Jun. 30, 2023
Significant Customers, Concentrations of Credit Risk, and Geographic Information |
Schedule of net revenues from customers | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30, |
​ |  | 2023 |  | 2022 |  | 2023 |  | 2022 |
Customer A |  | 23 | % | 24 | % | 27 | % | 30 | %
Customer B |  | 13 | % | * | % | * | % | * | %
Customer C | ​ | 11 | % | 25 | % | * | % | 20 | %
* Less than 10% of total net revenues
Schedule of net revenues by geographical area | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2023 |  | 2022 |  | 2023 |  | 2022
​ |  | (in thousands) | ​ | (in thousands)
United States | ​ | $ | 1,947 | ​ | $ | 995 | ​ | $ | 4,100 | ​ | $ | 1,996
Asia and Middle East | ​ |  | 1,128 | ​ |  | 969 | ​ |  | 1,954 | ​ |  | 1,780
Europe and other | ​ |  | 974 | ​ |  | 76 | ​ |  | 1,273 | ​ |  | 255
Revenue, net | ​ | $ | 4,049 | ​ | $ | 2,040 | ​ | $ | 7,327 | ​ | $ | 4,031
Schedule of assets by geographical area | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | December 31,
​ |  | 2023 |  | 2022
​ |  | (in thousands)
United States | ​ | $ | 782 | ​ | $ | 935
Europe | ​ | ​ | 4,527 | ​ | ​ | —
Asia | ​ |  | 325 | ​ |  | 344
Total long-lived assets | ​ | $ | 5,634 | ​ | $ | 1,279

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