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Stock-Based Compensation Arrangements (Details 2) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock-based compensation      
Stock-based compensation costs before income taxes $ 380,000 $ 882,000 $ 1,746,000
(Loss) income from discontinued operations, net of tax
     
Stock-based compensation      
Stock-based compensation costs before income taxes 43,000 42,000 51,000
Research and development
     
Stock-based compensation      
Stock-based compensation costs before income taxes 71,000 171,000 351,000
General and administrative
     
Stock-based compensation      
Stock-based compensation costs before income taxes $ 266,000 $ 669,000 $ 1,344,000