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Debt (Details) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Long-term debt maturities    
2012 $ 248,000  
2013 268,000  
2014 290,000  
2015 314,000  
2016 340,000  
Thereafter 1,194,000  
Total long-term debt 2,654,000  
Less current portion 248,000 101,367,000
Long-term debt, net of current portion 2,406,000 2,654,000
Mortgage Payable
   
Debt    
Land and buildings 5,000,000 5,100,000
Principal balance 2,700,000 2,900,000
Annual interest rate accrued on mortgage (as a percent) 7.91% 7.91%
Fair value of debt instrument 2,900,000 3,100,000
Convertible Notes
   
Debt    
Principal balance 0 105,574,000
Long-term debt maturities    
Total long-term debt $ 0 $ 101,138,000