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Warrant Liability - Summary of Changes in Fair Value of Warrant Liability (Detail) (USD $) | 9 Months Ended
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Sep. 30, 2013
Class of Warrant or Right [Line Items] |
Number of warrants, ending balance | 9,601,378
Series A Warrants [Member] |
Class of Warrant or Right [Line Items] |
Number of warrants, beginning balance | 8,501,429
Number of warrants exercised | (334,534)
Number of warrants, ending balance | 8,166,895
Fair value of warrant liability, beginning balance | $ 9,157,397
Fair value of warrants exercised | (418,841)
Fair value, changes in fair value at period end | (332,862)
Fair value of warrant liability, ending balance | $ 8,405,694

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
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