Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 14,521	$ 14,394
Accumulated amortization	(9,297)	(8,755)
Net carrying amount	5,224	5,639
Intangible assets, gross carrying value	16,683	16,532
Net	7,386	7,777
Trade names and trademarks
Finite-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	1,154	1,130
Licenses
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	1,414	1,414
Accumulated amortization	(1,267)	(1,200)
Net carrying amount	147	214
Patents and know-how
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	9,226	9,099
Accumulated amortization	(5,395)	(5,070)
Net carrying amount	3,831	4,029
Customer and supplier relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	3,761	3,761
Accumulated amortization	(2,552)	(2,417)
Net carrying amount	1,209	1,344
Non compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	120	120
Accumulated amortization	(83)	(68)
Net carrying amount	$ 37	$ 52