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Preferred Stock Warrants (Detail) | Dec. 31, 2010
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Information relating Preferred Stock Warrants |  |
Remaining Number Outstanding | 41,558,259 |
Series C Warrants Loans And Security Agreement |  |
Information relating Preferred Stock Warrants |  |
Remaining Number Outstanding | 280,803 |
Exercise price | 0.7345 |
Series D Warrants Convertible Debt |  |
Information relating Preferred Stock Warrants |  |
Remaining Number Outstanding | 4,368,948 |
Exercise price | 0.1198 |
Series D Warrants Series D Preferred Shares |  |
Information relating Preferred Stock Warrants |  |
Remaining Number Outstanding | 8,347,236 |
Exercise price | 0.1198 |
Series D Warrants First Amendment |  |
Information relating Preferred Stock Warrants |  |
Remaining Number Outstanding | 6,243,362 | [1]
Exercise price | 0.1198 | [1]
Series D Warrants Second Amendment |  |
Information relating Preferred Stock Warrants |  |
Remaining Number Outstanding | 8,694,558 | [1]
Exercise price | 0.1198 | [1]
Series D Warrants Third Amendment |  |
Information relating Preferred Stock Warrants |  |
Remaining Number Outstanding | 4,462,227 | [1]
Exercise price | 0.1198 | [1]
Series D Warrants Fifth Amendment |  |
Information relating Preferred Stock Warrants |  |
Remaining Number Outstanding | 2,260,440 | [1]
Exercise price | 0.1198 | [1]
Series D Warrants Sixth Amendment |  |
Information relating Preferred Stock Warrants |  |
Remaining Number Outstanding | 6,900,685 | [1]
Exercise price | 0.1198 | [1]
[1] | Warrants issued to lenders in conjunction with amendments to 2008 Loan and Security Agreement (see Note 7).

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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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