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Patents and other intangible assets
12 Months Ended
Dec. 31, 2012
Patents and other intangible assets
4.   Patents and other intangible assets

 

     December 31,  

(US$ in thousands)

   2012     2011  

Cost

    

Patents

   $ 37,695      $ 37,683   

Trademarks—definite lived

     657        545   
  

 

 

   

 

 

 
     38,352        38,228   

Accumulated amortization

    

Patents

     (31,045     (29,611

Trademarks—definite lived

     (427     (381
  

 

 

   

 

 

 
     (31,472     (29,992
  

 

 

   

 

 

 

Patents and other intangible assets, net

   $ 6,880      $ 8,236   
  

 

 

   

 

 

 

Amortization expense for intangible assets is estimated to be approximately $2.1 million, $1.4 million, $1.3 million, $1.2 million, $0.8 million and $0.1 million for the periods ending December 31, 2013, 2014, 2015, 2016, 2017 and 2018 and thereafter, respectively.