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Patents and other intangible assets
9 Months Ended
Sep. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]  
Patents and other intangible assets
4. Patents and other intangible assets

 

(US$ in thousands)

   September 30,
2013
    December 31,
2012
 
           (Restated)  

Cost

    

Patents

   $ 41,135      $ 38,905   

Trademarks — definite lived

     632        657   
  

 

 

   

 

 

 
     41,767        39,562   

Accumulated amortization

    

Patents

     (31,487     (31,845

Trademarks — definite lived

     (459     (427
  

 

 

   

 

 

 
     (31,946     (32,272
  

 

 

   

 

 

 

Patents and other intangible assets, net

   $ 9,821      $ 7,290