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Intangible Assets - Activity Summary (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 11,343 | $ 11,285
Accumulated Amortization | (7,957) | (7,334)
Net Carrying Amount | 3,386 | 3,951
Intangible assets, net | 5,620 | 6,004
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible assets, gross carrying amount | 13,577 | 13,338
Intangible assets, net carrying amount | 5,620 | 6,004
Tradenames and trademarks |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying value, indefinite lived | 1,008 | 1,008
Indefinite-lived Intangible Assets [Line Items] |  |
Gross carrying value, indefinite lived | 1,008 | 1,008
Patents in Process |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying value, indefinite lived | 1,226 | 1,045
Indefinite-lived Intangible Assets [Line Items] |  |
Gross carrying value, indefinite lived | 1,226 | 1,045
Patents and know-how |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 9,568 | 9,510
Accumulated Amortization | (6,238) | (5,730)
Net Carrying Amount | 3,330 | 3,780
Licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,414 | 1,414
Accumulated Amortization | (1,414) | (1,334)
Net Carrying Amount | 0 | 80
Customer and supplier relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 241 | 241
Accumulated Amortization | (185) | (172)
Net Carrying Amount | 56 | 69
Non-compete agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 120 | 120
Accumulated Amortization | (120) | (98)
Net Carrying Amount | $ 0 | $ 22

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