7. Intangible Assets

3 Months Ended

Mar. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

7. Intangible Assets

Intangible assets consisted of the following for the periods indicated (in thousands):

	March 31, 2015
	Gross Amount		Accumulated amortization			Intangible assets, net
Patents	$	5,062	$	(1,239	)	$	3,823
Trademarks		14		(9	)		5
Total intangible assets		5,076		(1,248	)		3,828

	December 31, 2014
	Gross Amount		Accumulated amortization			Intangible assets, net
Patents	$	4,968	$	(1,141	)	$	3,827
Trademarks		14		(8	)		6
Total intangible assets		4,982		(1,149	)		3,833

For the three months ended March 31, 2015 and 2014, amortization expense for intangible assets, included in general and administrative expenses on the income statement, was $100,000 and $69,000, respectively. The remaining weighted average amortization period for intangible assets is approximately 10 years.

In 2014 the Company acquired an intangible asset from an unrelated company in the form of a license to various patents related to transceiver product technology. The weighted-average amortization period for the license is 10 years.