Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value) (Details)

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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value) (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 5,497,788 $ 829,881
Current Liabilities, fair value (770,041) (1,002,623)
Assets (Liabilities) Net, fair value 22,805,682 23,346,369
Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 5,497,788 829,881
Assets (Liabilities) Net, fair value 5,497,788 829,881
Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets (Liabilities) Net, fair value 18,077,935 23,519,111
Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current Liabilities, fair value (770,041) (1,002,623)
Assets (Liabilities) Net, fair value (770,041) (1,002,623)
Money Market Funds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 5,497,788 829,881
Money Market Funds [Member] | Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 5,497,788 829,881
Accrued Consideration [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current Liabilities, fair value (770,041) (1,002,623)
Accrued Consideration [Member] | Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current Liabilities, fair value (770,041) (1,002,623)
Short-Term Investments [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 12,701,538 18,635,601
Short-Term Investments [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 12,701,538 18,635,601
Short-Term Investments [Member] | Certificates Of Deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 7,258,768 18,635,601
Short-Term Investments [Member] | Certificates Of Deposit [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 7,258,768 18,635,601
Short-Term Investments [Member] | Corporate Notes And Bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 3,800,143  
Short-Term Investments [Member] | Corporate Notes And Bonds [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 3,800,143  
Short-Term Investments [Member] | Commercial Paper [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 1,642,627  
Short-Term Investments [Member] | Commercial Paper [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 1,642,627  
Long Term Investments [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 5,376,397 4,883,510
Long Term Investments [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 5,376,397 4,883,510
Long Term Investments [Member] | Certificates Of Deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 900,763 4,883,510
Long Term Investments [Member] | Certificates Of Deposit [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 900,763 4,883,510
Long Term Investments [Member] | Corporate Notes And Bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 4,475,634  
Long Term Investments [Member] | Corporate Notes And Bonds [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments $ 4,475,634