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Significant Customers, Concentrations of Credit Risk, and Geographic Information (Tables) | 6 Months Ended
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Jun. 30, 2022
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, |
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021 | ​
Customer A |  | 24 | % | 14 | % | 30 | % | * | %
Customer B |  | * | % | 22 | % | * | % | 25 | %
Customer C | ​ | 25 | % | 10 | % | 20 | % | * | %
Customer D | ​ | * | % | * | % | * | % | 12 | %
* Less than 10% of total net revenues
Schedule of net revenues by geographical area | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended June 30, | ​ | Six months ended June 30,
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021
​ |  | (in thousands) | ​ | (in thousands)
United States | ​ | $ | 995 | ​ | $ | 590 | ​ | $ | 1,996 | ​ | $ | 860
Asia and Middle East | ​ |  | 969 | ​ |  | 1,378 | ​ |  | 1,780 | ​ |  | 2,490
Europe and other | ​ |  | 76 | ​ |  | 96 | ​ |  | 255 | ​ |  | 282
Revenue, net | ​ | $ | 2,040 | ​ | $ | 2,064 | ​ | $ | 4,031 | ​ | $ | 3,632
Schedule of assets by geographical area | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | December 31,
​ |  | 2022 |  | 2021
​ |  | (in thousands)
United States | ​ | $ | 387 | ​ | $ | 536
Asia | ​ |  | 261 | ​ |  | 176
Total long-lived assets | ​ | $ | 648 | ​ | $ | 712

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