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Stock-Based Compensation Arrangements (Details 2) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock-based compensation              
Stock-based compensation costs before income taxes $ 76,000 $ 221,000 $ 287,000 $ 677,000 $ 882,000 $ 1,746,000 $ 810,000
Discontinued operations
             
Stock-based compensation              
Stock-based compensation costs before income taxes 1,000 11,000 36,000 32,000 42,000 51,000 55,000
Research and development
             
Stock-based compensation              
Stock-based compensation costs before income taxes 16,000 39,000 49,000 130,000 171,000 351,000 271,000
Selling, general and administrative
             
Stock-based compensation              
Stock-based compensation costs before income taxes         $ 669,000 $ 1,344,000 $ 484,000