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Derivatives (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Derivatives [Abstract] |  |
Schedule of derivative warrant instruments activity |
|  | Units |  |  | Fair Value |
Balance, December 31, 2012 |  |  | 5,146,338 |  |  | $ | 3,574,958 |
Reclassification to paid in capital |  |  | (3,122,821 | ) |  |  | (590,217 | )
Change in fair value |  |  | - |  |  |  | (26,764 | )
Balance, June 30, 2013 |  |  | 2,023,517 |  |  | $ | 2,957,977 |
|  | Units |  |  | Fair Value |
Balance, December 31, 2010 |  |  | - |  |  | $ | - |
Warrants issued with Convertible Notes (See Note 5) |  |  | 287,061 |  |  |  | 377,150 |
Placement agent warrants related to issuance of Convertible Notes (See Note 5) |  |  | 143,532 |  |  |  | 188,579 |
Warrants issued with Stock Offering (See Note 9) |  |  | 1,972,785 |  |  |  | 2,591,900 |
Placement agent warrants related to issuance of stock (See Note 9) |  |  | 986,393 |  |  |  | 1,295,950 |
Change in fair value |  |  | - |  |  |  | (13,966 | )
Balance, December 31, 2011 |  |  | 3,389,771 |  |  |  | 4,439,613 |
Warrants issued with Stock Offering (See Note 9) |  |  | 242,190 |  |  |  | 318,087 |
Placement agent warrants related to Stock Offering (See Note 9) |  |  | 121,095 |  |  |  | 159,044 |
Warrants issued with 2012 Common Stock Offering-A (See Note 9) |  |  | 3,118,988 |  |  |  | 1,409,554 |
Warrants issued with 2012 Common Stock Offering-B (See Note 9) |  |  | 1,559,505 |  |  |  | 1,665,697 |
Placement agent warrants related to 2012 Common Stock Offering (See Note 9) |  |  | 467,845 |  |  |  | 499,707 |
Transfer from liability classification to equity classification |  |  | (3,753,056 | ) |  |  | (4,231,324 | )
Change in fair value |  |  | - |  |  |  | (685,420 | )
Balance, December 31, 2012 |  |  | 5,146,338 |  |  | $ | 3,574,958 |
Summary of fair values of derivative warrants on basis of valuation model |
|  | December 31, |  |  | June 30, |
|  | 2012 |  |  | 2013 |
Market value of common stock on measurement date (1) |  | $ | 1.17 |  |  | $ | 1.65 |
Adjusted exercise price |  | $ | 0.48 - $0.81 |  |  | $ | 1.50 - $2.475 |
Risk free interest rate (2) |  | $ | 0.10 - $0.77 |  |  |  | 1.05 | %
Warrant lives in years |  | 4 months/5 years |  |  | 4.5 years |
Expected volatility (3) |  |  | 125% - 161 | % |  |  | 154 | %
Expected dividend yield (4) |  |  | - |  |  |  | - |
(1) | The market value of common stock is based on an enterprise valuation.
(2) | The risk-free interest rate was determined by management using the Treasury Bill as of the respective measurement date.
(3) | Because the Company does not have adequate trading history to determine its historical trading volatility, the volatility factor was estimated by management using the historical volatilities of comparable companies in the same industry and region.
(4) | Management determined the dividend yield to be 0% based upon its expectation that it will not pay dividends for the foreseeable future.
|  | December 31, |  |  | January 31, |  |  | December 19, |  |  | December 27, |  |  | December 31, |
|  | 2011 |  |  | 2012 |  |  | 2012 |  |  | 2012 |  |  | 2012 |
Market value of common stock on measurement date (1) |  | $ | 0.37 |  |  | $ | 0.37 |  |  | $ | 0.39 |  |  | $ | 0.39 |  |  | $ | 0.39 |
Adjusted exercise price |  | $ | 0.24 - $0.26 |  |  | $ | 0.23 - $0.26 |  |  | $ | 0.41 - $0.83 |  |  | $ | 0.22 - $0.26 |  |  | $ | 0.41 - $0.83 |
Risk free interest rate (2) |  |  | 1.35 | % |  |  | 1.24 | % |  |  | 0.10% - 0.77 | % |  |  | 0.94 | % |  |  | 0.10% - 0.77 | %
Warrant lives in years |  | 7 years |  |  | 7 years |  |  | 4 months/5years |  |  | 6 years |  |  | 4 months/5years |
Expected volatility (3) |  |  | 156 | % |  |  | 157 | % |  |  | 125% - 161 | % |  |  | 161 | % |  |  | 125% - 161 | %
Expected dividend yield (4) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Probability of stock offering in any period over 5 years (5) |  |  | 25 | % |  |  | 25 | % |  |  | 25 | % |  |  | 25 | % |  |  | 25 | %
Range of percentage of existing shares offered (6) |  |  | 35 | % |  |  | 35 | % |  |  | 35 | % |  |  | 35 | % |  |  | 35 | %
Offering price range (7) |  | $ | 0.18 - $0.55 |  |  | $ | 0.13 - $0.56 |  |  | $ | 0.01 - $0.55 |  |  | $ | 0.12 - $0.60 |  |  | $ | 0.01 - $0.55 |
(1) | The market value of common stock is based on an enterprise valuation.
(2) | The risk-free interest rate was determined by management using the average of 5 and 7 year and the 3-month Treasury Bill as of the respective measurement date.
(3) | Because the Company does not have adequate trading history to determine its historical trading volatility, the volatility factor was estimated by management using the historical volatilities of comparable companies in the same industry and region.
(4) | Management determined the dividend yield to be 0% based upon its expectation that it will not pay dividends for the foreseeable future.
(5) | Management has determined that the probability of a stock offering is 25% for each quarter of the next five years.
(6) | Management estimates that the range of percentages of existing shares offered in each stock offering will be between 35% of the shares outstanding.
(7) | Represents the estimated offering price range in future offerings as determined by management.

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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41620-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579240-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41641-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41638-113959 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 Reference 11: 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.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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