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Significant Customers, Concentrations of Credit Risk, and Geographic Information (Tables) | 9 Months Ended
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Sep. 30, 2023
Significant Customers, Concentrations of Credit Risk, and Geographic Information |
Schedule of net revenues from customers | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30, |
​ |  | 2023 |  | 2022 |  | 2023 |  | 2022 |
Customer A |  | 11 | % | 20 | % | 22 | % | 27 | %
Customer B |  | 19 | % | * | % | 11 | % | * | %
Customer C | ​ | 11 | % | 15 | % | * | % | 18 | %
* Less than 10% of total net revenues
Schedule of net revenues by geographical area | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ |  | 2023 |  | 2022 |  | 2023 |  | 2022
​ |  | (in thousands) | ​ | (in thousands)
United States | ​ | $ | 1,257 | ​ | $ | 661 | ​ | $ | 5,357 | ​ | $ | 2,657
Asia and Middle East | ​ |  | 816 | ​ |  | 1,069 | ​ |  | 2,770 | ​ |  | 2,849
Europe and other | ​ |  | 1,002 | ​ |  | 121 | ​ |  | 2,275 | ​ |  | 376
Revenue, net | ​ | $ | 3,075 | ​ | $ | 1,851 | ​ | $ | 10,402 | ​ | $ | 5,882
Schedule of assets by geographical area | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, |  | December 31,
​ |  | 2023 |  | 2022
​ |  | (in thousands)
United States | ​ | $ | 717 | ​ | $ | 935
Europe | ​ | ​ | 4,358 | ​ | ​ | —
Asia | ​ |  | 289 | ​ |  | 344
Total long-lived assets | ​ | $ | 5,364 | ​ | $ | 1,279
​

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