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Fair Value Measurement - Financial Assets and Liabilities Measured at Fair Value (Detail) (USD $) | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Outstanding warrants [Member] |  |
Financial liabilities: |  |
Total financial liabilities | $ 5,868,000 |
Fair Value, Measurements [Member] |  |
Financial assets: |  |
Total financial assets | 26,032,328 |
Financial liabilities: |  |
Total financial liabilities | 21,783,602 |
Fair Value, Measurements [Member] | Money market funds [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets | 1,121,349 |
Fair Value, Measurements [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets | 24,910,979 |
Fair Value, Measurements [Member] | Bond obligation [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 71,250 |
Fair Value, Measurements [Member] | Loan Payable [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 15,843,919 |
Fair Value, Measurements [Member] | Outstanding warrants [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 5,868,433 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] |  |
Financial assets: |  |
Total financial assets | 26,032,328 |
Financial liabilities: |  |
Total financial liabilities |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] | Money market funds [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets | 1,121,349 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets | 24,910,979 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] | Bond obligation [Member] |  |
Financial liabilities: |  |
Total financial liabilities |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] | Loan Payable [Member] |  |
Financial liabilities: |  |
Total financial liabilities |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] | Outstanding warrants [Member] |  |
Financial liabilities: |  |
Total financial liabilities |  |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements [Member] |  |
Financial assets: |  |
Total financial assets |  |
Financial liabilities: |  |
Total financial liabilities | 71,250 |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements [Member] | Money market funds [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets |  |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets |  |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements [Member] | Bond obligation [Member] |  |
Financial assets: |  |
Total financial assets | 71,250 | 125,000
Financial liabilities: |  |
Total financial liabilities | 71,250 |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements [Member] | Loan Payable [Member] |  |
Financial liabilities: |  |
Total financial liabilities |  |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements [Member] | Outstanding warrants [Member] |  |
Financial liabilities: |  |
Total financial liabilities |  |
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] |  |
Financial assets: |  |
Total financial assets |  |
Financial liabilities: |  |
Total financial liabilities | 21,712,352 |
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | Money market funds [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets |  |
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets |  |
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | Bond obligation [Member] |  |
Financial liabilities: |  |
Total financial liabilities |  |
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | Loan Payable [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 15,843,919 |
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | Outstanding warrants [Member] |  |
Financial liabilities: |  |
Total financial liabilities | $ 5,868,433 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value of financial and nonfinancial obligations. + 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=25499696&loc=d3e19207-110258 + Details
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