Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Finite And Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, amortized intangible assets	$ 14,403	$ 14,394
Accumulated amortization, amortized intangible assets	(9,026)	(8,755)
Net carrying amount, amortized intangible assets	5,377	5,639
Total	16,607	16,532
Net	7,581	7,777
Tradenames & Trademarks
Schedule of Finite And Indefinite-Lived Intangible Assets [Line Items]
Carrying amount, unamortized intangible assets	1,008	1,008
Patents in Process
Schedule of Finite And Indefinite-Lived Intangible Assets [Line Items]
Carrying amount, unamortized intangible assets	1,196	1,130
Licenses
Schedule of Finite And Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, amortized intangible assets	1,414	1,414
Accumulated amortization, amortized intangible assets	(1,234)	(1,200)
Net carrying amount, amortized intangible assets	180	214
Patents & Know How
Schedule of Finite And Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, amortized intangible assets	9,108	9,099
Accumulated amortization, amortized intangible assets	(5,232)	(5,070)
Net carrying amount, amortized intangible assets	3,876	4,029
Customer & Supplier Relationships
Schedule of Finite And Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, amortized intangible assets	3,761	3,761
Accumulated amortization, amortized intangible assets	(2,485)	(2,417)
Net carrying amount, amortized intangible assets	1,276	1,344
Non-compete agreements
Schedule of Finite And Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, amortized intangible assets	120	120
Accumulated amortization, amortized intangible assets	(75)	(68)
Net carrying amount, amortized intangible assets	$ 45	$ 52