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GEOGRAPHIC AND SIGNIFICANT CUSTOMER INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2020
GEOGRAPHIC AND SIGNIFICANT CUSTOMER INFORMATION |
Schedules of concentration of risk, by risk factor | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Years Ended December 31,
​ |  | ​ | 2020 |  | 2019 |  | 2018
Applied Materials, Inc. | ​ | ​ | $ | 248,350 |  | 17.5 | % | ​ | $ | 164,724 |  | 20.9 | % | ​ | $ | 258,027 |  | 35.9 | %
Lam Research | ​ | ​ |  | 141,778 |  | 10.0 | % | ​ |  | 88,251 |  | 11.2 | % | ​ |  | 109,005 |  | 15.2 | %
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ | ​ | 2020 | ​ | ​ | 2019 | ​
Applied Materials, Inc. | ​ | $ | 33,402 |  | 14.2 | % |  | $ | 36,849 |  | 14.9 | %
Nidec Motor Corporation | ​ | ​ | 24,344 | ​ | 10.4 | % |  | ​ | 38,071 | ​ | 15.4 | %
Schedule of long-lived assets by geographic area | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
United States | ​ | $ | 253,115 | ​ | $ | 239,511
Asia | ​ |  | 283,549 | ​ |  | 301,020
Europe | ​ |  | 60,847 | ​ |  | 59,925
Total | ​ | $ | 597,511 | ​ | $ | 600,456

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