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REVENUE RECOGNITION - Disaggregation of Revenue (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 USD ($) segment | Mar. 31, 2020 USD ($)
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |
Number of reportable segment | segment | 1 |
Revenues | $ 101,677 | $ 92,382
United States |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |
Revenues | 56,642 | 56,369
Europe |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |
Revenues | 37,162 | 33,133
Asia-Pacific |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |
Revenues | 7,873 | 2,880
Vehicle |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |
Revenues | 34,451 | 28,055
Industrial |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |
Revenues | 31,303 | 33,351
Medical |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |
Revenues | 23,289 | 14,551
Aerospace & Defense |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |
Revenues | 7,442 | 11,142
Other |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |
Revenues | $ 5,192 | $ 5,283

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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