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Patents and other intangible assets (Tables)
6 Months Ended
Jun. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]  
Schedule of Patents and Other Intangible Assets

(US$ in thousands)

   June 30,
2013
    December 31,
2012
 
           (Restated)  

Cost

    

Patents

   $ 40,289      $ 38,905   

Trademarks — definite lived

     627        657   
  

 

 

   

 

 

 
     40,916        39,562   

Accumulated amortization

    

Patents

     (33,620     (31,845

Trademarks — definite lived

     (439     (427
  

 

 

   

 

 

 
     (34,059     (32,272
  

 

 

   

 

 

 

Patents and other intangible assets, net

   $ 6,857      $ 7,290