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Segment Information and Foreign Operations (Tables) | 12 Months Ended
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Dec. 31, 2024
Segment Information and Foreign Operations |
Revenues reported by product type | The following table represents revenue amounts (in thousands) by product type:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended | ​
​ | ​ | December 31, | ​
| ​ | 2024 |  | 2023 |  | 2022 |
​ | Product Type: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Substrates | $ | 67,748 | ​ | $ | 47,466 | ​ | $ | 111,094 | ​
​ | Raw materials and others |  | 31,613 | ​ |  | 28,329 | ​ |  | 30,024 | ​
​ | Total | $ | 99,361 | ​ | $ | 75,795 | ​ | $ | 141,118 | ​
Revenue reported for products shipped to customers in the corresponding geographic region | The following table represents revenue amounts (in thousands) reported for products shipped to customers in the corresponding geographic region:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended | ​
​ | ​ | December 31, | ​
| ​ | 2024 |  | 2023 |  | 2022 |
​ | Geographical region: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | China | $ | 56,119 | ​ | $ | 39,778 | ​ | $ | 55,414 | ​
​ | Taiwan | ​ | 14,098 | ​ | ​ | 8,651 | ​ | ​ | 28,780 | ​
​ | Japan | ​ | 4,979 | ​ | ​ | 4,641 | ​ | ​ | 11,724 | ​
​ | Asia Pacific (excluding China, Taiwan and Japan) | ​ | 2,818 | ​ | ​ | 3,814 | ​ | ​ | 4,188 | ​
​ | Europe (primarily Germany) | ​ | 13,766 | ​ | ​ | 12,315 | ​ | ​ | 20,592 | ​
​ | North America (primarily the United States) |  | 7,581 | ​ |  | 6,596 | ​ |  | 20,420 | ​
​ | Total | $ | 99,361 | ​ | $ | 75,795 | ​ | $ | 141,118 | ​
Long-lived assets by geographic region | Long-lived assets consist primarily of property, plant and equipment, and operating lease right-of-use assets are attributed to the geographic location in which they are located. Long-lived assets, net of depreciation, by geographic region were as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​
​ | ​ | As of December 31, | ​
​ |  | 2024 |  | 2023 |
Long-lived assets by geographic region, net of depreciation: | ​ | ​ | ​ | ​ | ​ | ​ | ​
North America | ​ | $ | 1,353 | ​ | $ | 1,631 | ​
China | ​ |  | 160,847 | ​ |  | 167,516 | ​
​ | ​ | $ | 162,200 | ​ | $ | 169,147 | ​
​

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