Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

Intangible assets consist of the following (in thousands):

	As of
	September 30, 2017			December 31, 2016
Patents issued	$	4,272		$	4,892
Patents pending		165			385
Trademarks		40			40
Total intangible assets		4,477			5,317
Less patent amortization		(1,396	)		(1,316	)
Intangible assets, net	$	3,081		$	4,001

Schedule of Patent Amortization Expense

The following table presents patent amortization expense included in the Condensed Consolidated Statement of Operations (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Amortization expense	$	79	$	130	$	245	$	394