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Disposals (Narrative) (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 17, 2021 | Mar. 08, 2021 | Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | May 07, 2021
Selling, general and administrative |  |  | $ 28,481 |  | $ 24,414 | $ 89,237 | $ 81,610 |
Gain on disposal |  |  |  |  |  | $ 30,718 |  |
Particulate Matter Sensor Assets [Member] |  |  |  |  |  |  |  |
Agreement date |  |  |  |  |  | Mar. 08, 2021 |  |
Disposal group, net sales |  |  | 3,228 |  | 2,587 | $ 9,536 | 6,350 |
Disposal group, operating income |  |  | 302 |  | $ (542) | 1,168 | $ (612) |
Purchase price for sale of assets |  | $ 4,000,000 |  |  |  |  |  |
Post-closing inventory adjustment payment |  | 1,133 |  |  |  |  |  |
Particulate Matter Sensor Assets [Member] | SMP [Member] |  |  |  |  |  |  |  |
Services provided income per agreement recognized as reduction to selling general and administrative expenses |  |  | 228 |  |  | 564 |  |
Disposal group, net sales |  |  | 3,228 |  |  | 6,298 |  |
Particulate Matter Sensor Assets [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |
Selling, general and administrative |  |  |  | $ 60 |  |  |  |
Particulate Matter Sensor Gen 1 Assets [Member] |  |  |  |  |  |  |  |
Purchase price for sale of assets |  | 3,214 |  |  |  |  |  |
Particulate Matter Sensor Gen 1 Assets [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | SMP [Member] |  |  |  |  |  |  |  |
Disposal group, net sales |  |  |  |  |  | 971 |  |
Particulate Matter Sensor Gen 2 Assets [Member] |  |  |  |  |  |  |  |
Purchase price for sale of assets |  | $ 786 |  |  |  |  |  |
Particulate Matter Sensor Gen 2 Assets [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |
Prepaid expenses and other current assets |  |  | $ 287 |  |  | $ 287 |  |
Canton Facility [Member] |  |  |  |  |  |  |  |
Agreement date |  |  |  |  |  | May 07, 2021 |  |
Proceeds from sale of productive assets | $ 35,167 |  |  |  |  |  |  |
Gain on disposal | 30,718 |  |  |  |  |  |  |
Purchase price for sale of assets | $ 37,900 |  |  |  |  |  |  | $ 38,200
Control Devices [Member] | Particulate Matter Sensor Gen 1 Assets [Member] |  |  |  |  |  |  |  |
Disposal group, net sales |  |  |  | 971 |  |  |  |
Disposal group, cost of goods sold |  |  |  | 898 |  |  |  |
Gain on disposal |  |  |  | $ 740 |  |  |  |

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