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v3.20.4

Segment Reporting and Geographic Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Segment Reporting and Geographic Information |
Schedule of sales by end-market | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the year ended December 31,
​ |  | 2020 |  | 2019 |  | 2018
​ | ​ | (in thousands)
Sales by end-market | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Semiconductor | ​ | $ | 165,909 | ​ | $ | 175,608 | ​ | $ | 137,797
Compound Semiconductor | ​ | ​ | 107,922 | ​ | ​ | 85,877 | ​ | ​ | 260,323
Data Storage | ​ |  | 123,288 | ​ |  | 84,075 | ​ |  | 69,141
Scientific & Other | ​ |  | 57,044 | ​ |  | 73,789 | ​ |  | 74,821
Total | ​ | $ | 454,163 | ​ | $ | 419,349 | ​ | $ | 542,082
Schedule of sales by geographic region | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net Sales to Unaffiliated Customers | ​ | Long-lived Tangible Assets
​ |  | 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018
​ | ​ | (in thousands)
United States | ​ | $ | 145,353 | ​ | $ | 126,160 | ​ | $ | 125,659 | ​ | $ | 64,967 | ​ | $ | 75,187 | ​ | $ | 78,503
EMEA(1) | ​ |  | 73,124 | ​ |  | 57,351 | ​ |  | 89,102 | ​ |  | 120 | ​ |  | 143 | ​ |  | 205
China | ​ | ​ | 57,589 | ​ | ​ | 71,078 | ​ | ​ | 194,032 | ​ | ​ | 84 | ​ | ​ | 130 | ​ | ​ | 81
Rest of APAC | ​ | ​ | 177,569 | ​ | ​ | 164,363 | ​ | ​ | 131,519 | ​ | ​ | 100 | ​ | ​ | 251 | ​ | ​ | 1,495
Rest of World | ​ |  | 528 | ​ |  | 397 | ​ |  | 1,770 | ​ |  | — | ​ |  | — | ​ |  | —
Total | ​ | $ | 454,163 | ​ | $ | 419,349 | ​ | $ | 542,082 | ​ | $ | 65,271 | ​ | $ | 75,711 | ​ | $ | 80,284
(1) | EMEA consists of Europe, the Middle East, and Africa

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