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Intangible Assets - Activity Summary (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 11,321 $ 11,285
Accumulated Amortization (7,766) (7,334)
Net Carrying Amount 3,555 3,951
Indefinite-lived Intangible Assets [Line Items]    
Intangible assets, gross carrying amount 13,516 13,338
Intangible assets, net carrying amount 5,750 6,004
Trade names and trademarks    
Indefinite-lived Intangible Assets [Line Items]    
Gross carrying value, indefinite lived 1,008 1,008
Patents in process    
Indefinite-lived Intangible Assets [Line Items]    
Gross carrying value, indefinite lived 1,187 1,045
Patents and know how    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 9,546 9,510
Accumulated Amortization (6,069) (5,730)
Net Carrying Amount 3,477 3,780
Licenses    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 1,414 1,414
Accumulated Amortization (1,403) (1,334)
Net Carrying Amount 11 80
Customer and supplier relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 241 241
Accumulated Amortization (181) (172)
Net Carrying Amount 60 69
Non-compete agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 120 120
Accumulated Amortization (113) (98)
Net Carrying Amount $ 7 $ 22