7. Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Gross Amount	$ 5,076	$ 4,982
Accumulated amortization	(1,248)	(1,149)
Intangible assets, net	3,828us-gaap_FiniteLivedIntangibleAssetsNet	3,833us-gaap_FiniteLivedIntangibleAssetsNet
Patents [Member]
Gross Amount	5,062	4,968
Accumulated amortization	(1,239)	(1,141)
Intangible assets, net	3,823	3,827
Trademarks [Member]
Gross Amount	14	14
Accumulated amortization	(9)	(8)
Intangible assets, net	$ 5	$ 6

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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