Intangible Assets, net (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Finite-Lived Intangible Assets, Net [Abstract]
Balance	$ 16,100			$ 16,100
Accumulated amortization	(7,240)			(7,240)
Intangible assets, net	8,860			8,860
Amortization expense of intangible assets	452	$ 452		905	$ 929
Impairment of intangible assets	0			0
Estimated amortization expense [Abstract]
Remaining 2019	905			905
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	8,860			8,860
Core Technology [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Balance	5,700			5,700
Accumulated amortization	(2,280)			(2,280)
Intangible assets, net	3,420			3,420
Estimated amortization expense [Abstract]
Intangible assets, net	3,420			3,420
Product Technology [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Balance	2,000			2,000
Accumulated amortization	(1,600)			(1,600)
Intangible assets, net	400			400
Estimated amortization expense [Abstract]
Intangible assets, net	400			400
Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Balance	6,900			6,900
Accumulated amortization	(2,760)			(2,760)
Intangible assets, net	4,140			4,140
Estimated amortization expense [Abstract]
Intangible assets, net	4,140			4,140
Tradenames [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Balance	1,500			1,500
Accumulated amortization	(600)			(600)
Intangible assets, net	900			900
Estimated amortization expense [Abstract]
Intangible assets, net	$ 900			$ 900
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		$ 11	$ 226
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