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REVENUE RECOGNITION - Disaggregation of Revenue (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) segment | Jun. 30, 2018 USD ($)
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |
Number of reportable segment | segment |  |  | 1 |
Disaggregation of revenue | $ 92,630 | $ 79,981 | $ 186,526 | $ 156,557
United States |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |
Disaggregation of revenue | 62,645 | 46,484 | 121,957 | 90,654
Europe |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |
Disaggregation of revenue | 29,390 | 32,947 | 63,561 | 64,779
Asia |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |
Disaggregation of revenue | 595 | 550 | 1,008 | 1,124
Vehicle |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |
Disaggregation of revenue | 30,778 | 31,193 | 64,374 | 63,354
Industrial |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |
Disaggregation of revenue | 32,194 | 28,073 | 63,505 | 51,965
Medical |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |
Disaggregation of revenue | 12,219 | 9,838 | 24,629 | 20,482
Aerospace & Defense |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |
Disaggregation of revenue | 12,143 | 8,558 | 23,397 | 16,369
Other |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |
Disaggregation of revenue | $ 5,296 | $ 2,319 | $ 10,621 | $ 4,387

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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