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Warrant Liability - Summary of Changes in Fair Value of Warrant Liability (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Class of Warrant or Right [Line Items] |  |  |  |
Fair value of warrant liability, beginning balance | $ 770,964 |  | $ 770,964 |
Exercised | (2,403,273) |  |  |
Cancelled | (1,786,170) |  |  |
Change in fair value of warrant liability | (4,250,308) | $ 427,589 | 1,596,554 | $ 1,068,626
Fair value of warrant liability, ending balance | 651,902 |  | 651,902 |
Series A Warrants [Member] |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Fair value of warrant liability, ending balance | 115,000 |  | 115,000 |
Series B Warrants [Member] |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Fair value of warrant liability, ending balance | 482,000 |  | 482,000 |
December 2011 Financing [Member] | Series A Warrants [Member] |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Fair value of warrant liability, beginning balance | 770,964 |  |  |
Exercised | (838,485) |  |  |
Change in fair value of warrant liability | 122,466 |  |  |
Fair value of warrant liability, ending balance | 54,945 |  | 54,945 |
March 2016 Financing [Member] | Series A Warrants [Member] |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Exercised | (1,564,788) |  |  |
Change in fair value of warrant liability | 1,679,706 |  |  |
Fair value of warrant liability, ending balance | 114,918 |  | 114,918 |
March 2016 Financing [Member] | Series B Warrants [Member] |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Cancelled | (1,786,170) |  |  |
Change in fair value of warrant liability | 2,268,209 |  |  |
Fair value of warrant liability, ending balance | $ 482,039 |  | $ 482,039 |

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- Definition Fair value of warrant liability. + References No definition available. + Details
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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6939902&loc=d3e20148-110875 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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