Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value) (Details) (USD $)
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Sep. 30, 2012
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Dec. 31, 2011
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Cash equivalents, fair value |
$ 1,932,299
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$ 829,881
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Current Liabilities, fair value |
(535,378)
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(1,002,623)
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Assets (Liabilities) Net, fair value |
22,999,397
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23,346,369
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Level 1 [Member]
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Cash equivalents, fair value |
1,932,299
|
829,881
|
Assets (Liabilities) Net, fair value |
1,932,299
|
829,881
|
Level 2 [Member]
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Assets (Liabilities) Net, fair value |
21,602,476
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23,519,111
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Level 3 [Member]
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Current Liabilities, fair value |
(535,378)
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(1,002,623)
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Assets (Liabilities) Net, fair value |
(535,378)
|
(1,002,623)
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Money Market Funds [Member]
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Cash equivalents, fair value |
1,932,299
|
829,881
|
Money Market Funds [Member] | Level 1 [Member]
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|
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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Cash equivalents, fair value |
1,932,299
|
829,881
|
Accrued Consideration [Member]
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Current Liabilities, fair value |
(535,378)
|
(1,002,623)
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Accrued Consideration [Member] | Level 3 [Member]
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|
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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Current Liabilities, fair value |
(535,378)
|
(1,002,623)
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Short-Term Investments [Member]
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Investments, fair value |
14,539,329
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18,635,601
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Short-Term Investments [Member] | Level 2 [Member]
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Investments, fair value |
14,539,329
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18,635,601
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Short-Term Investments [Member] | Certificates Of Deposit [Member]
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Investments, fair value |
11,166,760
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18,635,601
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Short-Term Investments [Member] | Certificates Of Deposit [Member] | Level 2 [Member]
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Investments, fair value |
11,166,760
|
18,635,601
|
Short-Term Investments [Member] | Corporate Notes/Bonds [Member]
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|
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Investments, fair value |
731,926
|
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Short-Term Investments [Member] | Corporate Notes/Bonds [Member] | Level 2 [Member]
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Investments, fair value |
731,926
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Short-Term Investments [Member] | Municipal Notes/Bonds [Member]
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Investments, fair value |
1,000,430
|
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Short-Term Investments [Member] | Municipal Notes/Bonds [Member] | Level 2 [Member]
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Investments, fair value |
1,000,430
|
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Short-Term Investments [Member] | Commercial Paper [Member]
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Investments, fair value |
1,640,213
|
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Short-Term Investments [Member] | Commercial Paper [Member] | Level 2 [Member]
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Investments, fair value |
1,640,213
|
|
Long-Term Investments [Member]
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Investments, fair value |
7,063,147
|
4,883,510
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Long-Term Investments [Member] | Level 2 [Member]
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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Investments, fair value |
7,063,147
|
4,883,510
|
Long-Term Investments [Member] | Certificates Of Deposit [Member]
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|
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Investments, fair value |
899,066
|
4,883,510
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Long-Term Investments [Member] | Certificates Of Deposit [Member] | Level 2 [Member]
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Investments, fair value |
899,066
|
4,883,510
|
Long-Term Investments [Member] | Corporate Notes/Bonds [Member]
|
|
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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Investments, fair value |
6,164,081
|
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Long-Term Investments [Member] | Corporate Notes/Bonds [Member] | Level 2 [Member]
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Investments, fair value |
$ 6,164,081
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