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Warrants Issued to Purchase Common Stock (Detail) |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Apr. 30, 2010 | Apr. 16, 2010 | Nov. 30, 2009 | Apr. 18, 2006 | Dec. 31, 2013 2007 Loan Agreement | Dec. 31, 2013 Warrant One 2007 Loan Agreement | Dec. 31, 2013 Warrant Two 2007 Loan Agreement | Dec. 31, 2013 Warrant Three 2007 Loan Agreement | Dec. 31, 2013 Warrant Four 2007 Loan Agreement
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |
Warrant Issuance Date |  |  |  |  |  |  | Jul. 18, 2007 | Oct. 18, 2007 | Dec. 27, 2007 | Dec. 27, 2007
Shares Issuable |  |  |  |  |  | 3,550,000 | 1,250,000 | 1,300,000 | 300,000 | 700,000
Expiration Date |  |  |  |  |  |  | Feb. 26, 2014 | Feb. 26, 2014 | Feb. 26, 2014 | Feb. 26, 2014
Warrants exercise price | 1.96 | 1.50 | 1.50 | 1.94 | 7.32 |  | 5.13 | 1.68 | 5.65 | 1.68
Outstanding | 10,913,873 |  |  |  |  | 1,550,000 | 1,250,000 |  | 300,000 |

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- Definition Warrant Issue Date + References No definition available. + Details
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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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- 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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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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