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Fair Value (Details 2) (USD $) | 12 Months Ended | 197 Months Ended |  | 0 Months Ended | 12 Months Ended |  | 0 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2012 | Dec. 14, 2012 | Dec. 14, 2012 Aspire Capital Fund, LLC | Dec. 31, 2012 Aspire Capital Fund, LLC | Dec. 14, 2012 Aspire Capital Fund, LLC Maximum | Mar. 06, 2013 Economic Rights | Mar. 22, 2012 Economic Rights | Dec. 31, 2012 Economic Rights | Dec. 31, 2012 Economic Rights | Dec. 31, 2012 Economic Rights Minimum | Dec. 31, 2012 Economic Rights Maximum | Feb. 28, 2007 Warrants | Dec. 31, 2012 Warrants | Dec. 31, 2011 Warrants
Reconciliation of the beginning and ending balance of Level 3 inputs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period | $ 71,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale |  |  |  |  |  |  |  |  |  | (1,097,000) |  |  |  |  |
Change in valuation of liability |  |  |  |  |  |  |  |  |  | (23,000) |  |  |  | 51,000 | (600,000)
Balance at the end of the period | 1,140,000 | 1,140,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued under purchase agreement |  |  |  | 158,982 |  |  |  |  |  |  |  |  |  |  |
Purchase price for shares issued under purchase agreement | 1,418,000 |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Shares committed to purchase |  |  |  | 1,455,787 |  |  |  |  |  |  |  |  |  |  |
Period of common stock purchase agreement |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |
Common stock purchase agreement, purchase commitment |  |  |  |  |  | 19,000,000 |  |  |  |  |  |  |  |  |
Stock issued for non-cash consideration |  |  |  | 74,548 |  |  |  |  |  |  |  |  |  |  |
Stock purchase agreement | 423,000 | 423,000 |  |  | 400,000 |  |  |  |  |  |  |  |  |  |
Amount to be paid as percentage of future litigation settlement amount received |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |
Fair value of the liability |  |  |  |  |  |  |  |  | 1,100,000 | 1,100,000 |  |  |  |  |
Change in fair value of the derivative | 23,000 | 23,000 |  |  |  |  |  |  | 23,000 |  |  |  |  |  |
Warrants Liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected volatility (as a percent) |  |  |  |  |  |  |  |  |  |  | 25.00% | 75.00% | 85.00% |  |
Amount of award or settlement |  |  |  |  |  |  |  |  |  |  | 10,000,000 | 20,000,000 |  |  |
Discount rate (as a percent) |  |  |  |  |  |  |  |  |  | 17.50% |  |  |  |  |
Timing of cash flows |  |  |  |  |  |  |  |  |  |  | 9 months | 1 year 6 months |  |  |
Royalty rate (as a percent) |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |
Litigation expenses |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |
Stay period |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |
Fair value of the warrants |  |  |  |  |  |  |  |  |  |  |  |  | 6,800,000 | 0 |
Risk free interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 4.68% |  |
Expected dividend yield (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |
Contractual life |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |
Expected term |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 1 month 17 days |
Value of financial instrument | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |

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