Goodwill and Intangible Assets - Intangible Assets Activity Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount, amortized intangible assets	$ 14,394	$ 14,985
Accumulated amortization, amortized intangible assets	(8,755)	(7,781)
Net carrying amount, amortized intangible assets	5,639	7,204
Intangible assets, gross carrying value	16,532	17,389
Net	7,777	9,608
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	1,130	1,396
Licenses
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount, amortized intangible assets	1,414	1,414
Accumulated amortization, amortized intangible assets	(1,200)	(1,066)
Net carrying amount, amortized intangible assets	214	348
Patents and know how
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount, amortized intangible assets	9,099	9,180
Accumulated amortization, amortized intangible assets	(5,070)	(4,475)
Net carrying amount, amortized intangible assets	4,029	4,705
Customer and supplier relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount, amortized intangible assets	3,761	4,271
Accumulated amortization, amortized intangible assets	(2,417)	(2,202)
Net carrying amount, amortized intangible assets	1,344	2,069
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount, amortized intangible assets	120	120
Accumulated amortization, amortized intangible assets	(68)	(38)
Net carrying amount, amortized intangible assets	$ 52	$ 82