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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Patents and Licensed Technologies, net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization		$ 0		$ 0
Patents and licensed technologies, net	$ 7,490		$ 7,490		$ 37
Amortization expense	244	$ 1	247	$ 4
Estimated amortization expense [Abstract]
Patents and licensed technologies, net	7,490		7,490		37
Core Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Patents and licensed technologies, gross	5,974		$ 5,974		274
Estimated useful life			10 years
Core Technology [Member] \| XTRAC and VTRAC [Member]
Finite-Lived Intangible Assets [Line Items]
Patents and licensed technologies, net	5,700		$ 5,700
Estimated useful life			10 years
Estimated amortization expense [Abstract]
Patents and licensed technologies, net	5,700		$ 5,700
Product Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Patents and licensed technologies, gross	2,000		$ 2,000		0
Estimated useful life			5 years
Product Technology [Member] \| XTRAC and VTRAC [Member]
Finite-Lived Intangible Assets [Line Items]
Patents and licensed technologies, net	2,000		$ 2,000
Estimated useful life			5 years
Estimated amortization expense [Abstract]
Patents and licensed technologies, net	2,000		$ 2,000
Patents and Licensed Technologies [Member]
Finite-Lived Intangible Assets [Line Items]
Patents and licensed technologies, gross	7,974		7,974		274
Accumulated amortization	(484)		(484)		(237)
Patents and licensed technologies, net	7,490		7,490		37
Estimated amortization expense [Abstract]
Last three months of 2015	238		238
2016	995		995
2017	995		995
2018	995		995
2019	995		995
Thereafter	3,272		3,272
Patents and licensed technologies, net	$ 7,490		$ 7,490		$ 37