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REVENUE RECOGNITION - Disaggregation of Revenue (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |  |  |  |  |  |  |  |
Number of reportable segment | segment |  |  |  |  |  |  |  |  | 1 |  |
Disaggregation of revenue | $ 73,962 | $ 80,092 | $ 79,981 | $ 76,576 | $ 65,355 | $ 64,968 | $ 60,335 | $ 61,354 | $ 310,611 | $ 252,012 | $ 245,893
United States |  |  |  |  |  |  |  |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  | 184,507 |  |
Europe |  |  |  |  |  |  |  |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  | 123,771 |  |
Asia |  |  |  |  |  |  |  |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  | 2,333 |  |
Vehicle |  |  |  |  |  |  |  |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  | 121,864 |  |
Industrial |  |  |  |  |  |  |  |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  | 101,332 |  |
Medical |  |  |  |  |  |  |  |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  | 43,239 |  |
Aerospace & Defense |  |  |  |  |  |  |  |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  | 35,927 |  |
Other |  |  |  |  |  |  |  |  |  |  |
Reconciliation of disaggregated revenue to segment revenue as well as revenue by geographical regions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  | $ 8,249 |  |

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