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Summary of Significant Accounting Policies Company's financial assets and liabilities at fair value (Details) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, Fair Value Disclosure $ 2,497,000 $ 0
Embedded Derivative, Fair Value of Embedded Derivative Liability 0 0
Warrants Not Settleable In Cash Fair Value Disclosure 0 0
Contingent Consideration Classified As Equity Fair Value Disclosure 0  
Fair Value, Inputs, Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, Fair Value Disclosure 0 2,501,000
Embedded Derivative, Fair Value of Embedded Derivative Liability 0 0
Warrants Not Settleable In Cash Fair Value Disclosure 0 0
Contingent Consideration Classified As Equity Fair Value Disclosure 0  
Fair Value, Inputs, Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, Fair Value Disclosure 0 0
Embedded Derivative, Fair Value of Embedded Derivative Liability 392,000 2,282,000
Warrants Not Settleable In Cash Fair Value Disclosure 83,000 289,600
Contingent Consideration Classified As Equity Fair Value Disclosure $ 3,130,000