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Significant Customers, Concentrations of Credit Risk, and Geographic Information (Tables) | 9 Months Ended
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Sep. 30, 2022
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, |
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021 | ​
Customer A |  | 20 | % | 15 | % | 27 | % | 11 | %
Customer B |  | * | % | 17 | % | * | % | 22 | %
Customer C | ​ | 15 | % | * | % | 18 | % | * | %
Customer D | ​ | 12 | % | * | % | * | % | * | %
Customer E |  | 10 | % | 12 | % | * | % | 12 | %
* Less than 10% of total net revenues
Schedule of net revenues by geographical area | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended September 30, | ​ | Nine months ended September 30,
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021
​ |  | (in thousands) | ​ | (in thousands)
United States | ​ | $ | 661 | ​ | $ | 674 | ​ | $ | 2,657 | ​ | $ | 1,534
Asia and Middle East | ​ |  | 1,069 | ​ |  | 1,383 | ​ |  | 2,849 | ​ |  | 3,873
Europe and other | ​ |  | 121 | ​ |  | 166 | ​ |  | 376 | ​ |  | 448
Revenue, net | ​ | $ | 1,851 | ​ | $ | 2,223 | ​ | $ | 5,882 | ​ | $ | 5,855
Schedule of assets by geographical area | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, |  | December 31,
​ |  | 2022 |  | 2021
​ |  | (in thousands)
United States | ​ | $ | 314 | ​ | $ | 536
Asia | ​ |  | 215 | ​ |  | 176
Total long-lived assets | ​ | $ | 529 | ​ | $ | 712

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