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Preferred Stock Warrants and Warrant Liability (Tables) | 12 Months Ended
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Dec. 31, 2012
Information Relating Preferred Stock Warrants | Information relating to these warrants at December 31, 2010 is summarized as follows:
Warrants |  | Remaining Number Outstanding |  |  | Exercise Price |
Series C Warrants-2008 Loan and Security Agreement |  |  | 280,803 |  |  | $ | 0.7345 |
Series D Warrants-2009 Convertible Debt |  |  | 4,368,948 |  |  | $ | 0.1198 |
Series D Warrants-Series D Preferred Stock Issuance |  |  | 8,347,236 |  |  | $ | 0.1198 |
*Series D Warrants-1 st Amendment |  |  | 6,243,362 |  |  | $ | 0.1198 |
*Series D Warrants-2 nd Amendment |  |  | 8,694,558 |  |  | $ | 0.1198 |
*Series D Warrants-3 rd Amendment |  |  | 4,462,227 |  |  | $ | 0.1198 |
*Series D Warrants-5 th Amendment |  |  | 2,260,440 |  |  | $ | 0.1198 |
*Series D Warrants-6 th Amendment |  |  | 6,900,685 |  |  | $ | 0.1198 |
Total |  |  | 41,558,259 |  |  |  |  |
* | Warrants issued to lenders in conjunction with amendments to 2008 Loan and Security Agreement (see Note 7).
Fair Value Of Warrants Using Binomial Lattice Valuation Model | The following assumptions were incorporated into the valuations for 2011 and 2010:
|  | 2011
Exercise price |  | $0.1198 – $0.7345
Market value of stock at end of period |  | $0.01
Expected dividend rate |  | 0.00%
Expected volatility |  | 33.47% – 62.86%
Risk-free interest rate |  | 0.03% – 3.18%
Expected life in years |  | 3.40 – 9.90
Shares underlying warrants outstanding classified as liabilities |  | 41,558,259

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, used to measure similar assets in prior periods (non-recurring basis) by class of asset or liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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