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Fair Value Measurement (Details) (USD $) | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Financial assets: |  |
Total financial assets | $ 10,181,831 | $ 14,339,896
Fair Value, Measurements [Member] |  |
Financial assets: |  |
Total financial assets | 16,425,756 |
Financial liabilities: |  |
Total financial liabilities | 9,316,382 |
Fair Value, Measurements [Member] | Bond obligation [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 281,250 |
Fair Value, Measurements [Member] | Warrant liabilities [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 9,035,132 |
Fair Value, Measurements [Member] | Money market funds [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets | 321,197 |
Fair Value, Measurements [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets | 6,287,050 |
Fair Value, Measurements [Member] | Debt securities [Member] | Marketable securities [Member] |  |
Financial assets: |  |
Total financial assets | 9,817,509 |
Fair Value, Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial assets: |  |
Total financial assets | 6,608,247 |
Financial liabilities: |  |
Total financial liabilities |  |
Fair Value, Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Bond obligation [Member] |  |
Financial liabilities: |  |
Total financial liabilities |  |
Fair Value, Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Warrant liabilities [Member] |  |
Financial liabilities: |  |
Total financial liabilities |  |
Fair Value, Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money market funds [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets | 321,197 |
Fair Value, Measurements [Member] | 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 | 6,287,050 |
Fair Value, Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Debt securities [Member] | Marketable securities [Member] |  |
Financial assets: |  |
Total financial assets |  |
Fair Value, Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Financial assets: |  |
Total financial assets | 9,817,509 |
Financial liabilities: |  |
Total financial liabilities | 364,322 |
Fair Value, Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Bond obligation [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 281,250 |
Fair Value, Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Warrant liabilities [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 83,072 |
Fair Value, Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Money market funds [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets |  |
Fair Value, Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets |  |
Fair Value, Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Debt securities [Member] | Marketable securities [Member] |  |
Financial assets: |  |
Total financial assets | 9,817,509 |
Fair Value, Measurements [Member] | Unobservable Inputs (Level 3) [Member] |  |
Financial assets: |  |
Total financial assets |  |
Financial liabilities: |  |
Total financial liabilities | 8,952,060 |
Fair Value, Measurements [Member] | Unobservable Inputs (Level 3) [Member] | Bond obligation [Member] |  |
Financial liabilities: |  |
Total financial liabilities |  |
Fair Value, Measurements [Member] | Unobservable Inputs (Level 3) [Member] | Warrant liabilities [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 8,952,060 |
Fair Value, Measurements [Member] | Unobservable Inputs (Level 3) [Member] | Money market funds [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets |  |
Fair Value, Measurements [Member] | Unobservable Inputs (Level 3) [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets |  |
Fair Value, Measurements [Member] | Unobservable Inputs (Level 3) [Member] | Debt securities [Member] | Marketable securities [Member] |  |
Financial assets: |  |
Total financial assets |  |

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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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