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Warrant Liability - Summary of Changes in Fair Value of Warrant Liability (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Nov. 30, 2014 | Dec. 31, 2013
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of warrant liability, beginning balance |  |  |  | $ 1,684,551 |  |  |  |  | $ 1,684,551 |  |  |
Change in fair value of warrant liability | $ 155,000 | $ (427,000) | $ (988,000) | $ 347,000 | $ (2,327,000) | $ (4,076,000) | $ 3,654,000 | $ 327,000 | 913,587 | $ 2,422,451 | $ 2,422,451 | $ 3,253,253
Fair value of warrant liability, ending balance | $ 770,964 |  |  |  | $ 1,684,551 |  |  |  | $ 770,964 | $ 1,684,551 |  |
Series A Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of Warrants, beginning balance |  |  |  | 6,936,880 |  |  |  |  | 6,936,880 |  |  |
Number of Warrants, changes in fair value | 0 |  |  |  |  |  |  |  | 0 |  |  |
Number of Warrants, ending balance | 6,936,880 |  |  |  | 6,936,880 |  |  |  | 6,936,880 | 6,936,880 |  |
Fair value of warrant liability, beginning balance |  |  |  | $ 1,684,551 |  |  |  |  | $ 1,684,551 |  |  |
Change in fair value of warrant liability |  |  |  |  |  |  |  |  | (913,587) |  |  |
Fair value of warrant liability, ending balance | $ 770,964 |  |  |  | $ 1,684,551 |  |  |  | $ 770,964 | $ 1,684,551 |  |

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- Definition Fair value of warrant liability. + References No definition available. + Details
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- Definition Increase Decrease In Number Of Warrants + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + 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=56944662&loc=d3e3602-108585 + Details
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- Details
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