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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $) | Dec. 31, 2012 | Dec. 31, 2011
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Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | $ 20,690,939 | $ 38,365,818
Liabilities, fair value | 2,859,899 | 5,176,319
Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 12,389,738 | 25,402,398
Liabilities, fair value | 0 | 0
Using Significant Other Unobservable Inputs (Level 2) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 8,034,001 | 12,863,420
Liabilities, fair value | 0 | 0
Using Significant Unobservable Inputs (Level 3) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 267,200 | 100,000
Liabilities, fair value | 2,859,899 | 5,176,319
Money market funds [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 1,686,406 | 16,330,885
Money market funds [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 1,686,406 | 16,330,885
Money market funds [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value |  | 0
Money market funds [Member] | Using Significant Unobservable Inputs (Level 3) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Mutual funds [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 7,583,931 | 6,037,115
Mutual funds [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Mutual funds [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 7,583,931 | 6,037,115
Mutual funds [Member] | Using Significant Unobservable Inputs (Level 3) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Certificates of deposit [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 250,000 | 5,768,304
Certificates of deposit [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Certificates of deposit [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 250,000 | 5,768,304
Certificates of deposit [Member] | Using Significant Unobservable Inputs (Level 3) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Municipal bonds [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 200,070 | 1,058,001
Municipal bonds [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Municipal bonds [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 200,070 | 1,058,001
Municipal bonds [Member] | Using Significant Unobservable Inputs (Level 3) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Investment in affiliated entity [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 10,703,332 | 9,071,513
Investment in affiliated entity [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 10,703,332 | 9,071,513
Investment in affiliated entity [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Investment in affiliated entity [Member] | Using Significant Unobservable Inputs (Level 3) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Common stock warrants [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 267,200 | 100,000
Liabilities, fair value | 2,859,899 | 5,176,319
Common stock warrants [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Liabilities, fair value | 0 | 0
Common stock warrants [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Liabilities, fair value | 0 | 0
Common stock warrants [Member] | Using Significant Unobservable Inputs (Level 3) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 267,200 | 100,000
Liabilities, fair value | $ 2,859,899 | $ 5,176,319

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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