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Significant Customers, Concentrations of Credit Risk, and Geographic Information (Tables) | 6 Months Ended
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Jun. 30, 2021
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, | ​
​ |  | 2021 |  | 2020 |  | 2021 | ​ | 2020 | ​
Customer A |  | 22 | % | 15 | % | 25 | % | 13 | %
Customer B |  | 14 | % | * | % | * | % | 15 | %
Customer C |  | 10 | % | 10 | % | * | % | * | %
Customer D |  | * | % | 12 | % | 12 | % | 11 | %
* Less than 10% of total net revenues
Schedule of net revenues by geographical area | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended June 30, | ​ | Six months ended June 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
​ |  | (in thousands)
United States | ​ | $ | 590 | ​ | $ | 680 | ​ | $ | 860 | ​ | $ | 1,422
Asia and Middle East | ​ |  | 1,378 | ​ |  | 871 | ​ |  | 2,490 | ​ |  | 1,642
Europe and other | ​ |  | 96 | ​ |  | 151 | ​ |  | 282 | ​ |  | 329
Revenue, net | ​ | $ | 2,064 | ​ | $ | 1,702 | ​ | $ | 3,632 | ​ | $ | 3,393
Schedule of assets by geographical area | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | December 31,
​ |  | 2021 |  | 2020
​ |  | (in thousands)
United States | ​ | $ | 1,191 | ​ | $ | 1,194
Asia | ​ |  | 243 | ​ |  | 332
Total long-lived assets | ​ | $ | 1,434 | ​ | $ | 1,526

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