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GEOGRAPHIC AND SIGNIFICANT CUSTOMER INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2021
GEOGRAPHIC AND SIGNIFICANT CUSTOMER INFORMATION |
Schedules of concentration of risk, by risk factor | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31, | ​
​ |  | 2021 | ​ |  | 2020 | ​ |  | 2019 | ​
Applied Materials, Inc. | ​ | $ | 296,369 |  | 20.4 | % | ​ | $ | 248,350 |  | 17.5 | % | ​ | $ | 164,724 |  | 20.9 | %
Lam Research Corporation | ​ |  | 147,385 |  | 10.1 | % | ​ |  | 141,778 |  | 10.0 | % | ​ |  | 88,251 |  | 11.2 | %
​ The following table summarizes the accounts receivable balances and percentages of the total accounts receivable from customers who individually accounted for 10% or more of accounts receivable: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, | ​ |  | December 31, | ​
​ | ​ | 2021 | ​ | ​ | 2020 | ​
Applied Materials, Inc. | ​ | $ | 42,425 |  | 17.9 | % |  | $ | 33,402 |  | 14.2 | %
Nidec Motor Corporation | ​ | ​ | * | ​ | * | % |  | $ | 24,344 | ​ | 10.4 | %
* Customer’s balance was less than 10% of total
Schedule of long-lived assets by geographic area | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2021 |  | 2020
United States | ​ | $ | 255,791 | ​ | $ | 253,115
Asia | ​ |  | 275,260 | ​ |  | 283,549
Europe | ​ |  | 57,144 | ​ |  | 60,847
Total | ​ | $ | 588,195 | ​ | $ | 597,511

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