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Patents and other intangible assets (Details) (USD $)
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Intangible assets    
Cost $ 33,028,000 $ 38,228,000
Patents and other intangible assets, net 7,294,000 8,236,000
Future Amortization expense    
2012 (Remainder of the period) 1,000,000  
2013 2,000,000  
2014 1,300,000  
2015 1,300,000  
2016 900,000  
2017 and thereafter 800,000  
Patents and developed technologies
    
Intangible assets    
Cost 32,480,000 37,683,000
Accumulated amortization (25,339,000) (29,611,000)
Trademarks - definite lived (subject to amortization)
    
Intangible assets    
Cost 548,000 545,000
Accumulated amortization $ (395,000) $ (381,000)