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Significant Customers, Concentrations of Credit Risk, and Geographic Information (Tables) | 9 Months Ended
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Sep. 30, 2021
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, | ​
​ |  | 2021 |  | 2020 |  | 2021 | ​ | 2020 | ​
Customer A |  | 17 | % | 24 | % | 22 | % | 17 | %
Customer B |  | 15 | % | * | % | 11 | % | 11 | %
Customer C |  | * | % | 11 | % | 13 | % | 11 | %
* Less than 10% of total net revenues
Schedule of net revenues by geographical area | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended September 30, | ​ | Nine months ended September 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
​ |  | (in thousands)
United States | ​ | $ | 674 | ​ | $ | 512 | ​ | $ | 1,534 | ​ | $ | 1,934
Asia and Middle East | ​ |  | 1,383 | ​ |  | 935 | ​ |  | 3,873 | ​ |  | 2,577
Europe and other | ​ |  | 166 | ​ |  | 101 | ​ |  | 448 | ​ |  | 430
Revenue, net | ​ | $ | 2,223 | ​ | $ | 1,548 | ​ | $ | 5,855 | ​ | $ | 4,941
Schedule of assets by geographical area | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, |  | December 31,
​ |  | 2021 |  | 2020
​ |  | (in thousands)
United States | ​ | $ | 1,124 | ​ | $ | 1,194
Asia | ​ |  | 204 | ​ |  | 332
Total long-lived assets | ​ | $ | 1,328 | ​ | $ | 1,526

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