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Derivatives (Details) (USD $) | 6 Months Ended | 12 Months Ended | 151 Months Ended | 157 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 | Jun. 30, 2013
Schedule of derivative warrant instruments activity |  |  |  |  |  |
Beginning balance, Units | 5,146,338 | 3,389,771 | 3,389,771 |  |  |
Warrants issued with Convertible Notes (See Note 5), Units |  |  |  | 287,061 |  |
Reclassification to paid in capital, Units | (3,122,821) |  |  |  |  |
Placement agent warrants related to issuance of Convertible Notes (See Note 5), Units |  |  |  | 143,532 |  |
Warrants issued with Stock Offering (See Note 9), Units |  |  | 242,190 | 1,972,785 |  |
Placement agent warrants related to issuance of Stock Offering (See Note 9), Units |  |  | 121,095 | 986,393 |  |
Warrants issued with 2012 Common Stock Offering - A (See Note 9), Units |  |  | 3,118,988 |  |  |
Warrants issued with 2012 Common Stock Offering - B (See Note 9), Units |  |  | 1,559,505 |  |  |
Placement agent warrants related to 2012 Common Stock Offering (See Note 9), Units |  |  | 467,845 |  |  |
Transfer from liability classification to equity classification, Units |  |  | (3,753,056) |  |  |
Balance, Units | 2,023,517 |  | 5,146,338 | 3,389,771 | 5,146,338 | 2,023,517
Beginning balance, Fair Value | $ 3,574,958 | $ 4,439,613 | $ 4,439,613 |  |  |
Reclassification to paid in capital, Fair Value | (590,217) |  |  |  |  |
Warrants issued with Convertible Notes (See Note 5), Fair Value |  |  |  | 377,150 |  |
Placement agent warrants related to issuance of Convertible Notes (See Note 5), Fair Value |  |  |  | 188,579 |  |
Warrants issued with Stock Offering (See Note 9), Fair Value |  |  | 318,087 | 2,591,900 |  |
Placement agent warrants related to issuance of Stock Offering (See Note 9), Fair Value |  |  | 159,044 | 1,295,950 |  |
Warrants issued with 2012 Common Stock Offering - A (See Note 9), Fair Value |  |  | 1,409,554 |  |  |
Warrants issued with 2012 Common Stock Offering - B (See Note 9), Fair Value |  |  | 1,665,697 |  |  |
Placement agent warrants related to 2012 Common Stock Offering (See Note 9), Fair Value |  |  | 499,707 |  |  |
Transfer from liability classification to equity classification, Fair Value | 590,217 |  | 4,231,324 |  | 4,231,324 | 4,821,542
Change in fair value | (26,764) |  | (685,420) | (13,966) |  |
Balance, Fair Value | $ 2,957,977 |  | $ 3,574,958 | $ 4,439,613 | $ 3,574,958 | $ 2,957,977

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