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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.