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Fair Value Measurement - Financial Assets and Liabilities Measured at Fair Value (Detail) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Outstanding warrants [Member] |  |
Financial liabilities |  |
Total financial liabilities | $ 5,541,809 |
Fair Value, Measurements [Member] |  |
Financial assets |  |
Total financial assets | 29,230,143 |
Financial liabilities |  |
Total financial liabilities | 18,576,054 |
Fair Value, Measurements [Member] | Money market funds [Member] | Cash equivalents (money market accounts) [Member] |  |
Financial assets |  |
Total financial assets | 821,335 |
Fair Value, Measurements [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents (money market accounts) [Member] |  |
Financial assets |  |
Total financial assets | 28,408,808 |
Fair Value, Measurements [Member] | Bond obligation [Member] |  |
Financial liabilities |  |
Total financial liabilities | 125,000 |
Fair Value, Measurements [Member] | Loan Payable [Member] |  |
Financial liabilities |  |
Total financial liabilities | 12,909,244 |
Fair Value, Measurements [Member] | Outstanding warrants [Member] |  |
Financial liabilities |  |
Total financial liabilities | 5,541,810 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] |  |
Financial assets |  |
Total financial assets | 29,230,143 |
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 (money market accounts) [Member] |  |
Financial assets |  |
Total financial assets | 821,335 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents (money market accounts) [Member] |  |
Financial assets |  |
Total financial assets | 28,408,808 |
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 | 125,000 |
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Measurements [Member] | Money market funds [Member] | Cash equivalents (money market accounts) [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 (money market accounts) [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 | 125,000 | 331,250
Financial liabilities |  |
Total financial liabilities | 125,000 |
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 assets |  |
Total financial assets |  | 107,968
Financial liabilities |  |
Total financial liabilities |  |
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] |  |
Financial assets |  |
Total financial assets |  |
Financial liabilities |  |
Total financial liabilities | 18,451,054 |
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | Money market funds [Member] | Cash equivalents (money market accounts) [Member] |  |
Financial assets |  |
Total financial assets |  |
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents (money market accounts) [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 | 12,909,244 |
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | Outstanding warrants [Member] |  |
Financial liabilities |  |
Total financial liabilities | $ 5,541,810 |

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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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