Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity and Stock Based Compensation (Details)

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Stockholders' Equity and Stock Based Compensation (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2008
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Dec. 31, 2007
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Dec. 31, 2006
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2006 Plan
              
Stock-based compensation              
Number of shares of Common Stock initially available for award 800,000            
Number of shares of Common Stock available for future award grants 53,775            
2006 Plan | Restricted stock
              
Stock-based compensation              
Granted (in shares) 72,000 15,000 150,500 140,000 57,500 30,000 315,000
Forfeited (in shares) 3,525 8,375 5,875   3,500 12,500  
Number of equal quarterly installments for vesting of awards 20 20 20 20 20 20 20
2006 Plan | Restricted stock | CEO
              
Stock-based compensation              
Granted (in shares)             200,000
Number of equal quarterly installments for vesting of awards             40
2012 Plan
              
Stock-based compensation              
Number of shares of Common Stock initially available for award 600,000            
Number of shares of Common Stock available for future award grants 600,000