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Fair Value Measurement - Financial Assets and Liabilities Measured at Fair Value (Detail) - Fair Value, Measurements [Member] - USD ($) | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Financial liabilities: |  |
Total financial liabilities | $ 2,651,902 | $ 11,104,993
Financial assets: |  |
Total financial assets |  | 13,702,875
Money market funds [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets |  | 2,544,475
U.S. Treasury debt obligations [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets |  | 11,158,400
Note Payable [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 2,000,000 |
Warrants [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 651,902 | 770,964
Loans Payable [Member] |  |
Financial liabilities: |  |
Total financial liabilities |  | 10,334,029
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial assets: |  |
Total financial assets |  | 13,702,875
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money market funds [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets |  | 2,544,475
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 |  | 11,158,400
Significant Other Observable Inputs (Level 2) [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 2,651,902 |
Significant Other Observable Inputs (Level 2) [Member] | Note Payable [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 2,000,000 |
Significant Other Observable Inputs (Level 2) [Member] | Warrants [Member] |  |
Financial liabilities: |  |
Total financial liabilities | $ 651,902 |
Unobservable Inputs (Level 3) [Member] |  |
Financial liabilities: |  |
Total financial liabilities |  | 11,104,993
Unobservable Inputs (Level 3) [Member] | Warrants [Member] |  |
Financial liabilities: |  |
Total financial liabilities |  | 770,964
Unobservable Inputs (Level 3) [Member] | Loans Payable [Member] |  |
Financial liabilities: |  |
Total financial liabilities |  | $ 10,334,029

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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=66048111&loc=d3e19207-110258 + Details
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