7. Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

	June 30, 2015
	Gross Amount		Accumulated amortization			Intangible assets, net
Patents	$	5,172	$	(1,340	)	$	3,832
Trademarks		14		(9	)		5
Total intangible assets		5,186		(1,349	)		3,837

	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