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Derivatives (Details 1) (USD $) | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 19, 2012 | Dec. 27, 2012 | Jan. 31, 2012 | Jun. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Summary of fair values of derivative warrants on basis of valuation model |  |  |  |  |  |
Market value of common stock on measurement date (1) | $ 0.39 | $ 0.39 | $ 0.37 | $ 1.65 | $ 0.39 | $ 0.37
Risk free interest rate (2) |  | 0.94% | 1.24% | 1.05% |  | 1.35%
Warrant lives in years |  | 6 years | 7 years | 4 years 6 months |  | 7 years
Expected volatility (3) |  | 161.00% | 157.00% | 154.00% |  | 156.00%
Expected dividend yield (4) |  |  |  |  |  |
Probability of stock offering in any period over 5 years (5) | 25.00% | 25.00% | 25.00% |  | 25.00% | 25.00%
Range of percentage of existing shares offered (6) | 35.00% | 35.00% | 35.00% |  | 35.00% | 35.00%
Maximum [Member] |  |  |  |  |  |
Summary of fair values of derivative warrants on basis of valuation model |  |  |  |  |  |
Adjusted exercise price | $ 0.83 | $ 0.26 | $ 0.26 | $ 2.475 | $ 0.83 | $ 0.26
Risk free interest rate (2) | 0.77% |  |  |  | 0.77% |
Warrant lives in years | 5 years |  |  |  | 5 years |
Expected volatility (3) | 161.00% |  |  |  | 161.00% |
Offering price range (7) | $ 0.55 | $ 0.60 | $ 0.56 |  | $ 0.55 | $ 0.55
Minimum [Member] |  |  |  |  |  |
Summary of fair values of derivative warrants on basis of valuation model |  |  |  |  |  |
Adjusted exercise price | $ 0.41 | $ 0.22 | $ 0.23 | $ 1.50 | $ 0.41 | $ 0.24
Risk free interest rate (2) | 0.10% |  |  |  | 0.10% |
Warrant lives in years | 4 months |  |  |  | 4 months |
Expected volatility (3) | 125.00% |  |  |  | 125.00% |
Offering price range (7) | $ 0.01 | $ 0.12 | $ 0.13 |  | $ 0.01 | $ 0.18

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- Definition Agreed upon price for the exchange of the underlying asset. + 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 (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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