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Fair Value Measurements Fair value hierarchy the Company’s financial assets and liabilities (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant Derivative Liabilities $ 0 $ 0
Contingent Consideration Classified As Equity Fair Value Disclosure 0 0
Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant Derivative Liabilities 0 0
Contingent Consideration Classified As Equity Fair Value Disclosure 0 0
Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant Derivative Liabilities 90,600 101,200
Contingent Consideration Classified As Equity Fair Value Disclosure $ 7,550,000 $ 7,550,000