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Fair Value Measurement (Details) (Fair Value, Measurements [Member], USD $) | Sep. 30, 2012
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Financial assets |
Total financial assets | $ 21,463,358
Financial liabilities: |
Total financial liabilities | 14,864,398
Bond obligation [Member] |
Financial liabilities: |
Total financial liabilities | 381,250
Warrant liabilities [Member] |
Financial liabilities: |
Total financial liabilities | 14,483,148
Money market funds [Member] | Cash equivalents [Member] |
Financial assets |
Total financial assets | 1,170,798
U.S. Treasury debt obligations [Member] | Cash equivalents [Member] |
Financial assets |
Total financial assets | 14,260,825
Debt securities [Member] | Marketable securities [Member] |
Financial assets |
Total financial assets | 6,031,735
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |
Financial assets |
Total financial assets | 15,431,623
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money market funds [Member] | Cash equivalents [Member] |
Financial assets |
Total financial assets | 1,170,798
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member] |
Financial assets |
Total financial assets | 14,260,825
Significant Other Observable Inputs (Level 2) [Member] |
Financial assets |
Total financial assets | 6,031,735
Financial liabilities: |
Total financial liabilities | 615,738
Significant Other Observable Inputs (Level 2) [Member] | Bond obligation [Member] |
Financial liabilities: |
Total financial liabilities | 381,250
Significant Other Observable Inputs (Level 2) [Member] | Warrant liabilities [Member] |
Financial liabilities: |
Total financial liabilities | 234,488
Significant Other Observable Inputs (Level 2) [Member] | Debt securities [Member] | Marketable securities [Member] |
Financial assets |
Total financial assets | 6,031,735
Unobservable Inputs (Level 3) [Member] |
Financial liabilities: |
Total financial liabilities | 14,248,660
Unobservable Inputs (Level 3) [Member] | Warrant liabilities [Member] |
Financial liabilities: |
Total financial liabilities | $ 14,248,660

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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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Balance Type: | credit
Period Type: | instant

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- Details
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