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Stockholders' Equity - Summary of Information about Warrants (Detail) |  |  | 3 Months Ended
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Mar. 31, 2014 | Sep. 30, 2013 | Mar. 31, 2014 Warrant 1 | Mar. 31, 2014 Warrant 2 | Mar. 31, 2014 Warrant 3 | Mar. 31, 2014 Warrant 4 | Mar. 31, 2014 Warrant 5 | Mar. 31, 2014 Warrant 6 | Mar. 31, 2014 Warrant 7 | Mar. 31, 2014 Warrant 8
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price of warrant |  | 1.83 | 70.60 | 5.00 | 5.09 | 1.38 | 4.16 | 3.25 | 2.12 | 1.83
Number of Warrants | 2,533,507 |  | 94,897 | 995,692 | 291,204 | 24,324 | 1,000 | 746,306 | 75,000 | 305,084
Remaining Life in Years |  |  | 3 years 1 month 6 days | 8 months 12 days | 8 months 12 days | 1 year 8 months 12 days | 2 years 8 months 12 days | 2 years 4 months 24 days | 3 years 8 months 12 days | 3 years 8 months 12 days

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- Definition Exercise price per share or per unit 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)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 4 -Article 4 + Details
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