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2004 Plan Outstanding Options Rollforward (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Options outstanding at January 1 1,624,188 1,410,090    
Options granted   409,900 305,450 858,950
Options exercised   (7,318) (14,451) (12,951)
Options terminated, cancelled or expired   (188,484) 73,699 502,548
Options outstanding at December 31   1,624,188 1,410,090  
Options exercisable at December 31   1,236,374    
Exercise price of options outstanding at January 1 (US$ per share) $ 2.47 $ 2.70 $ 2.88 $ 6.27
Exercise price of options granted (US$ per share) $ 0.73 $ 1.73 $ 1.92 $ 3.00
Exercise price of options exercised (US$ per share)   $ 1.92 $ 2.06 $ 1.96
Exercise price of options outstanding at December 31 (US$ per share)   $ 2.47 $ 2.70 $ 2.88