Intangible Assets, net (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Finite-Lived Intangible Assets, Net [Abstract]
Balance	$ 16,100				$ 16,100
Accumulated amortization	(7,693)				(7,693)
Intangible assets, net	8,407				8,407
Amortization expense of intangible assets	453	$ 452			1,358	$ 1,381
Impairment of intangible assets	0				0
Estimated amortization expense [Abstract]
Remaining 2019	452				452
2020	1,610				1,610
2021	1,410				1,410
2022	1,410				1,410
2023	1,410				1,410
Thereafter	2,115				2,115
Intangible assets, net	8,407				8,407
Core Technology [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Balance	5,700				5,700
Accumulated amortization	(2,422)				(2,422)
Intangible assets, net	3,278				3,278
Estimated amortization expense [Abstract]
Intangible assets, net	3,278				3,278
Product Technology [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Balance	2,000				2,000
Accumulated amortization	(1,700)				(1,700)
Intangible assets, net	300				300
Estimated amortization expense [Abstract]
Intangible assets, net	300				300
Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Balance	6,900				6,900
Accumulated amortization	(2,933)				(2,933)
Intangible assets, net	3,967				3,967
Estimated amortization expense [Abstract]
Intangible assets, net	3,967				3,967
Tradenames [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Balance	1,500				1,500
Accumulated amortization	(638)				(638)
Intangible assets, net	862				862
Estimated amortization expense [Abstract]
Intangible assets, net	$ 862				$ 862
Distribution Rights [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite lived intangible assets, gross, write-off			$ 237
Distribution Rights [Member] | Selling and Marketing Expense [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Write-off of Intangible Assets, Finite-lived				$ 226		$ 11
Distribution Rights [Member] | Nordlys Product [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite lived intangible assets, gross, write-off				286
Finite lived intangible assets, accumulated Amortization, write-off				$ 60