v2.4.0.8
F. INTANGIBLE ASSETS (Tables)
 12 Months Ended
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible assets

At December 31, 2013 and 2012, intangible assets consisted of the following:

 

    2013  
    Gross Amount     Accumulated amortization     Intangible assets, net  
    (in thousands)  
Patents   $ 1,632     $ (784 )   $ 848  
Trademarks     10       (7 )     3  
Total tangible assets     1,642       (791 )     851  

 

    2012  
    Gross Amount     Accumulated amortization     Intangible assets, net  
    (in thousands)  
Patents   $ 1,509     $ (718 )   $ 791  
Trademarks     10       (6 )     4  
Total tangible assets     1,519       (724 )     795  
Amortization expense for intangible assets

At December 31, 2013, approximate amortization expense for intangible assets was as follows (in thousands):

 

2014   $ 68  
2015     68  
2016     68  
2017     68  
2018     68  
Thereafter     511  
    $ 851