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Warrants Issued to Purchase Common Stock (Detail) | 12 Months Ended
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Dec. 31, 2012
Class of Warrant or Right [Line Items] |
Outstanding | 10,913,873
2007 Loan Agreement |
Class of Warrant or Right [Line Items] |
Shares Issuable | 3,550,000
Outstanding | 1,800,000
Warrant One | 2007 Loan Agreement |
Class of Warrant or Right [Line Items] |
Warrant Issuance Date | Jul. 18, 2007
Shares Issuable | 1,250,000
Expiration Date | Feb. 26, 2014
Exercise Price per Share | 5.13
Outstanding | 1,250,000
Warrant Two | 2007 Loan Agreement |
Class of Warrant or Right [Line Items] |
Warrant Issuance Date | Oct. 18, 2007
Shares Issuable | 1,300,000
Expiration Date | Feb. 26, 2014
Exercise Price per Share | 1.68
Outstanding | 250,000
Warrant Three | 2007 Loan Agreement |
Class of Warrant or Right [Line Items] |
Warrant Issuance Date | Dec. 27, 2007
Shares Issuable | 300,000
Expiration Date | Feb. 26, 2014
Exercise Price per Share | 5.65
Outstanding | 300,000
Warrant Four | 2007 Loan Agreement |
Class of Warrant or Right [Line Items] |
Warrant Issuance Date | Dec. 27, 2007
Shares Issuable | 700,000
Expiration Date | Feb. 26, 2014
Exercise Price per Share | 1.68

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- Definition The exercise price of each class 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=6881521&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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- Definition Aggregate amount of each class of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6881521&loc=d3e23780-122690 Reference 3: 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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