The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of deprecation and amortization expense attributable to property, plant and equipment and intangible assets of discontinued operations.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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Intangible Assets, net (Details) - USD ($) $ in Thousands	3 Months Ended
Intangible Assets, net (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Patents and licensed technologies, gross	$ 15,600		$ 15,886
Accumulated amortization	(4,928)		(4,561)
Intangible assets, net	10,672		11,325
Amortization expense of intangible assets	427	$ 454
Impairment of intangible assets	226	$ 0
Estimated amortization expense [Abstract]
Remaining 2018	1,207
2019	1,610
2020	1,510
2021	1,410
2022	1,410
Thereafter	3,525
Intangible assets, net	10,672		11,325
Nordlys Product [Member]
Finite-Lived Intangible Assets [Line Items]
Write-off of accumulated amortization of discontinued operations	60
Core Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Patents and licensed technologies, gross	5,700		5,700
Product Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Patents and licensed technologies, gross	1,500		1,500
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Patents and licensed technologies, gross	6,900		6,900
Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Patents and licensed technologies, gross	1,500		1,500
Distribution Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Patents and licensed technologies, gross	0		$ 286
Impairment of intangible assets	286
Distribution Rights [Member] \| Selling and Marketing Expense [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets	$ 226