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Intangible Assets - Activity Summary (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
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