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Fair Value Measurement (Details) (Fair Value, Measurements [Member], USD $) | Dec. 31, 2012
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Financial assets |
Total financial assets | $ 22,117,685
Financial liabilities: |
Total financial liabilities | 9,596,615
Bond obligation [Member] |
Financial liabilities: |
Total financial liabilities | 331,250
Warrant liabilities [Member] |
Financial liabilities: |
Total financial liabilities | 9,265,365
Money market funds [Member] | Cash equivalents [Member] |
Financial assets |
Total financial assets | 521,075
U.S. Treasury debt obligations [Member] | Cash equivalents [Member] |
Financial assets |
Total financial assets | 7,695,932
Debt securities [Member] | Marketable securities [Member] |
Financial assets |
Total financial assets | 13,900,678
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |
Financial assets |
Total financial assets | 8,217,007
Financial liabilities: |
Total financial liabilities |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Bond obligation [Member] |
Financial liabilities: |
Total financial liabilities |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Warrant liabilities [Member] |
Financial liabilities: |
Total financial liabilities |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money market funds [Member] | Cash equivalents [Member] |
Financial assets |
Total financial assets | 521,075
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 | 7,695,932
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Debt securities [Member] | Marketable securities [Member] |
Financial assets |
Total financial assets |
Significant Other Observable Inputs (Level 2) [Member] |
Financial assets |
Total financial assets | 13,900,678
Financial liabilities: |
Total financial liabilities | 439,218
Significant Other Observable Inputs (Level 2) [Member] | Bond obligation [Member] |
Financial liabilities: |
Total financial liabilities | 331,250
Significant Other Observable Inputs (Level 2) [Member] | Warrant liabilities [Member] |
Financial liabilities: |
Total financial liabilities | 107,968
Significant Other Observable Inputs (Level 2) [Member] | Money market funds [Member] | Cash equivalents [Member] |
Financial assets |
Total financial assets |
Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member] |
Financial assets |
Total financial assets |
Significant Other Observable Inputs (Level 2) [Member] | Debt securities [Member] | Marketable securities [Member] |
Financial assets |
Total financial assets | 13,900,678
Unobservable Inputs (Level 3) [Member] |
Financial assets |
Total financial assets |
Financial liabilities: |
Total financial liabilities | 9,157,397
Unobservable Inputs (Level 3) [Member] | Bond obligation [Member] |
Financial liabilities: |
Total financial liabilities |
Unobservable Inputs (Level 3) [Member] | Warrant liabilities [Member] |
Financial liabilities: |
Total financial liabilities | 9,157,397
Unobservable Inputs (Level 3) [Member] | Money market funds [Member] | Cash equivalents [Member] |
Financial assets |
Total financial assets |
Unobservable Inputs (Level 3) [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member] |
Financial assets |
Total financial assets |
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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