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Patents and other intangible assets (Tables)
3 Months Ended
Mar. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]  
Schedule of Patents and Other Intangible Assets

(US$ in thousands)

   March 31,
2013
    December 31,
2012
 

Cost

    

Patents

   $ 37,992      $ 37,695   

Trademarks — definite lived

     679        657   
  

 

 

   

 

 

 
     38,671        38,352   

Accumulated amortization

    

Patents

     (31,452 )     (31,045 )

Trademarks — definite lived

     (454 )     (427 )
  

 

 

   

 

 

 
     (31,906     (31,472
  

 

 

   

 

 

 

Patents and other intangible assets, net

   $ 6,765      $ 6,880