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Segment Reporting and Geographic Information (Tables) | 12 Months Ended
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Dec. 31, 2023
Segment Reporting and Geographic Information |
Schedule of sales by end-market | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | For the year ended December 31,
​ |  |  | 2023 |  | 2022 |  | 2021
​ | ​ | ​ | (in thousands)
Sales by end-market | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Semiconductor | ​ | ​ | $ | 412,724 | ​ | $ | 369,369 | ​ | $ | 247,051
Compound Semiconductor | ​ | ​ | ​ | 87,258 | ​ | ​ | 121,194 | ​ | ​ | 106,972
Data Storage | ​ | ​ |  | 88,473 | ​ |  | 87,544 | ​ |  | 168,760
Scientific & Other | ​ | ​ |  | 77,980 | ​ |  | 68,030 | ​ |  | 60,494
Total | ​ | ​ | $ | 666,435 | ​ | $ | 646,137 | ​ | $ | 583,277
Schedule of sales by geographic region | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net Sales to Unaffiliated Customers | ​ | Long-lived Tangible Assets
​ |  | 2023 |  | 2022 |  | 2021 |  | 2023 |  | 2022 |  | 2021
​ | ​ | (in thousands)
United States | ​ | $ | 162,790 | ​ | $ | 197,433 | ​ | $ | 217,209 | ​ | $ | 117,594 | ​ | $ | 106,550 | ​ | $ | 99,220
EMEA(1) | ​ |  | 76,697 | ​ |  | 87,837 | ​ |  | 55,129 | ​ |  | 219 | ​ |  | 60 | ​ |  | 94
China | ​ | ​ | 217,942 | ​ | ​ | 123,703 | ​ | ​ | 105,998 | ​ | ​ | 182 | ​ | ​ | 70 | ​ | ​ | 67
Rest of APAC | ​ | ​ | 208,693 | ​ | ​ | 235,735 | ​ | ​ | 204,633 | ​ | ​ | 464 | ​ | ​ | 601 | ​ | ​ | 362
Rest of World | ​ |  | 313 | ​ |  | 1,429 | ​ |  | 308 | ​ |  | — | ​ |  | — | ​ |  | —
Total | ​ | $ | 666,435 | ​ | $ | 646,137 | ​ | $ | 583,277 | ​ | $ | 118,459 | ​ | $ | 107,281 | ​ | $ | 99,743
(1) | EMEA consists of Europe, the Middle East, and Africa

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- Definition Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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