7. Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Gross Amount	$ 5,186	$ 4,982
Accumulated amortization	(1,349)	(1,149)
Intangible assets, net	3,837	3,833
Patents [Member]
Gross Amount	5,172	4,968
Accumulated amortization	(1,340)	(1,141)
Intangible assets, net	3,832	3,827
Trademarks [Member]
Gross Amount	14	14
Accumulated amortization	(9)	(8)
Intangible assets, net	$ 5	$ 6