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Warrant Liability - Summary of Changes in Fair Value of Warrant Liability (Detail) - USD ($) | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Class of Warrant or Right [Line Items] |  |
Fair value of warrant liability, beginning balance | $ 770,964 |
New Issues | 5,666,935 |
Change in fair value of warrant liability | (278,228) | $ 347,330
Fair value of warrant liability, ending balance | 6,159,671 |
Series A Warrants [Member] |  |
Class of Warrant or Right [Line Items] |  |
Fair value of warrant liability, ending balance | 1,761,000 |
Series B Warrants [Member] |  |
Class of Warrant or Right [Line Items] |  |
Fair value of warrant liability, ending balance | 3,887,000 |
December 2011 Financing [Member] | Series A Warrants [Member] |  |
Class of Warrant or Right [Line Items] |  |
Fair value of warrant liability, beginning balance | 770,964 |
Change in fair value of warrant liability | (259,370) |
Fair value of warrant liability, ending balance | 511,594 |
March 2016 Financing [Member] | Series A Warrants [Member] |  |
Class of Warrant or Right [Line Items] |  |
New Issues | 1,770,596 |
Change in fair value of warrant liability | (9,659) |
Fair value of warrant liability, ending balance | 1,760,937 |
March 2016 Financing [Member] | Series B Warrants [Member] |  |
Class of Warrant or Right [Line Items] |  |
New Issues | 3,896,339 |
Change in fair value of warrant liability | (9,199) |
Fair value of warrant liability, ending balance | $ 3,887,140 |

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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=56944662&loc=d3e3602-108585 + Details
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