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REVENUE (Tables) | 12 Months Ended
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Dec. 31, 2021
REVENUE |
Summary of deferred revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ |  | 2021 |  | 2020
Deferred revenue | ​ | $ | 7,067 | ​ | $ | 8,671
Schedule of disaggregation of revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  | Years Ended December 31,
​ | ​ | ​ | 2021 |  | 2020 |  | 2019
Semiconductor Equipment | ​ | ​ | $ | 710,174 | ​ | $ | 611,864 | ​ | $ | 403,018
Industrial and Medical | ​ | ​ |  | 341,176 | ​ |  | 313,646 | ​ |  | 245,992
Data Center Computing | ​ | ​ | ​ | 270,924 | ​ | ​ | 322,539 | ​ | ​ | 91,438
Telecom and Networking | ​ | ​ | ​ | 133,680 | ​ | ​ | 167,777 | ​ | ​ | 48,500
Total | ​ | ​ | $ | 1,455,954 | ​ | $ | 1,415,826 | ​ | $ | 788,948
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Years Ended December 31, |
​ |  |  | 2021 |  | 2020 |  | 2019 |
United States | ​ | ​ | $ | 561,312 | ​ | 38.5 | % | $ | 530,965 | ​ | 37.5 | % | $ | 321,869 | ​ | 40.8 | %
North America (excluding U.S.) | ​ | ​ | ​ | 104,167 |  | 7.2 | ​ | ​ | 156,856 |  | 11.1 | ​ | ​ | 51,765 |  | 6.6 | ​
Asia | ​ | ​ |  | 597,830 |  | 41.1 | ​ |  | 606,893 |  | 42.9 | ​ |  | 295,155 |  | 37.4 | ​
Europe | ​ | ​ |  | 179,056 |  | 12.3 | ​ |  | 117,989 |  | 8.3 | ​ |  | 119,427 |  | 15.1 | ​
Other | ​ | ​ |  | 13,589 |  | 0.9 | ​ |  | 3,123 |  | 0.2 | ​ |  | 732 |  | 0.1 | ​
Total | ​ | ​ | $ | 1,455,954 |  | 100.0 | % | $ | 1,415,826 |  | 100.0 | % | $ | 788,948 |  | 100.0 | %
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2021 |  | 2020 |  | 2019
Product | ​ | $ | 1,318,213 | ​ | $ | 1,296,867 | ​ | $ | 678,061
Services | ​ | ​ | 137,741 |  | ​ | 118,959 |  | ​ | 110,887
Total | ​ | $ | 1,455,954 |  | $ | 1,415,826 |  | $ | 788,948

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- Definition Tabular disclosure of the type of arrangements and the corresponding amounts that comprise the current and noncurrent balance of deferred revenue as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6935-107765 + Details
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