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REVENUE RECOGNITION - Disaggregation of Revenue (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) segment | Jun. 30, 2019 USD ($)
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |
Number of reportable segment | segment |  |  | 1 |
Revenues | $ 86,661 | $ 92,630 | $ 179,043 | $ 186,526
United States |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |
Revenues | 47,311 | 62,645 | 103,680 | 121,957
Europe |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |
Revenues | 29,012 | 29,390 | 62,145 | 63,561
Other |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |
Revenues | 10,338 | 595 | 13,218 | 1,008
Vehicle |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |
Revenues | 18,584 | 30,778 | 46,639 | 64,374
Industrial |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |
Revenues | 28,223 | 32,194 | 61,574 | 63,505
Medical |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |
Revenues | 24,261 | 12,219 | 38,812 | 24,629
Aerospace & Defense |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |
Revenues | 10,516 | 12,143 | 21,658 | 23,397
Other |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |
Revenues | $ 5,077 | $ 5,296 | $ 10,360 | $ 10,621

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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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