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Fair Value Measurement - Financial Assets and Liabilities Measured at Fair Value (Detail) (USD $) | Sep. 30, 2013 | Dec. 31, 2012
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Warrant liabilities [Member] |  |
Financial liabilities: |  |
Total financial liabilities | $ 8,420,954 |
Fair Value, Measurements [Member] |  |
Financial assets: |  |
Total financial assets | 20,955,293 |
Financial liabilities: |  |
Total financial liabilities | 22,068,052 |
Fair Value, Measurements [Member] | Money market funds [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets | 377,695 |
Fair Value, Measurements [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets | 20,577,598 |
Fair Value, Measurements [Member] | Bond obligation [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 178,750 |
Fair Value, Measurements [Member] | Loan payable net of discounts [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 13,468,348 |
Fair Value, Measurements [Member] | Warrant liabilities [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 8,420,954 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] |  |
Financial assets: |  |
Total financial assets | 20,955,293 |
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 | 377,695 |
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 | 20,577,598 |
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 net of discounts [Member] |  |
Financial liabilities: |  |
Total financial liabilities |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] | Warrant liabilities [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 | 194,010 |
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 | 178,750 | 331,250
Financial liabilities: |  |
Total financial liabilities | 178,750 |
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Measurements [Member] | Loan payable net of discounts [Member] |  |
Financial liabilities: |  |
Total financial liabilities |  |
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Measurements [Member] | Warrant liabilities [Member] |  |
Financial assets: |  |
Total financial assets | 15,260 | 107,968
Financial liabilities: |  |
Total financial liabilities | 15,260 |
UNobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] |  |
Financial assets: |  |
Total financial assets |  |
Financial liabilities: |  |
Total financial liabilities | 21,874,042 |
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 net of discounts [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 13,468,348 |
UNobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | Warrant liabilities [Member] |  |
Financial liabilities: |  |
Total financial liabilities | $ 8,405,694 |

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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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