Intangible Assets, net (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets

The following table summarizes our major classes of intangible assets (in thousands):

	December 31,
	2017			2016
Patents	$	871		$	1,102
Licenses	379			379
	1,250			1,481
Accumulated amortization	(475		)	(466		)
Intangibles, net	$	775		$	1,015