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Statements of Cash Flows (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
Cash Flows From Operating Activities: |  |  |  |  |  |
Net loss | $ (3,473,038) | $ (2,471,500) | $ (8,361,205) | $ (3,444,795) | $ (55,743,463) | $ (59,216,501)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |  |  |  |
Stock-based compensation expense | 188,400 | 240,400 | 2,223,926 | 2,173,377 | 6,052,036 | 6,240,436
Depreciation expense |  | 317 | 581 | 633 | 3,262,462 | 3,262,462
Loss on disposition of equipment | 4,122 |  |  |  | 550,186 | 554,307
Amortization of debt discount |  | 451,267 | 775,637 | 124,363 | 900,000 | 900,000
Amortization of deferred financing costs |  | 145,951 | 252,248 | 40,444 | 292,692 | 292,692
Gain on extinguishment of liability |  |  |  |  | (260,000) | (260,000)
Gain on change in fair value of derivative | (26,764) | (6,777) | (685,420) | (13,966) | (699,386) | (726,150)
(Increase) decrease in: |  |  |  |  |  |
R&D reimbursable receivable | (2,126) | 50,069 | 234,088 | 41,567 | (3,746) | (5,872)
Prepaid expenses and other current assets | 85,000 | (8,494) | (18,013) | 4,766 | (23,397) | 61,604
Increase (decrease) in: |  |  |  |  |  |
Accounts payable and accrued liabilities | (103,414) | (263,465) | 334,263 | 556,019 | 1,238,773 | 1,135,359
Accounts payable and accrued liabilities - related party |  |  | 31,185 |  | 31,185 | 31,185
Net Cash Used In Operating Activities | (3,327,820) | (1,862,232) | (5,212,710) | (517,592) | (44,402,658) | (47,730,478)
Cash Flows From Investing Activities: |  |  |  |  |  |
Payment made for patent rights |  |  |  |  | (3,000,000) | (3,000,000)
Purchase of property and equipment | (1,112) | (1,157) | (2,359) |  | (815,659) | (816,771)
Net Cash Used In Investing Activities | (1,112) | (1,157) | (2,359) |  | (3,815,659) | (3,816,771)
Cash Flows From Financing Activities: |  |  |  |  |  |
Borrowings on convertible debt, net of offering costs |  |  |  | 645,888 | 645,888 | 645,888
Payments on note payable | (103,050) |  |  |  |  | (103,050)
Sales of stock, net of offering costs |  | 660,163 | 5,129,940 | 5,379,367 | 53,191,098 | 53,191,098
Proceeds from the exercise of warrants for cash | 3,463,641 |  |  |  |  | 3,463,641
Net Cash Provided By Financing Activities | 3,360,591 | 660,163 | 5,129,940 | 6,025,255 | 53,836,986 | 57,197,577
Net change in cash | 31,659 | (1,203,226) | (85,129) | 5,507,663 | 5,618,669 | 5,650,328
Cash at beginning of period | 5,618,669 | 5,703,798 | 5,703,798 | 196,135 |  |
Cash at end of period | 5,650,328 | 4,500,572 | 5,618,669 | 5,703,798 | 5,618,669 | 5,650,328
Supplemental disclosures of cash flow information: |  |  |  |  |  |
Cash paid for interest | 561 |  |  |  | 682 | 1,243
Cash paid for taxes |  |  |  |  |  |
Supplemental disclosure of non-cash investing and financing activities: |  |  |  |  |  |
Beneficial conversion feature discount |  |  |  | 372,850 | 372,850 | 372,850
Fair value of warrants issued with debt |  |  |  | 377,150 | 377,150 | 377,150
Fair value of warrants issued with stock |  | 318,087 | 3,393,338 | 2,591,900 | 5,985,238 | 5,985,238
Fair value of warrants issued to the placement agent |  | 159,044 | 658,753 | 1,484,529 | 2,170,282 | 2,170,282
Conversion of notes payable and accrued interest to stock |  |  | 981,729 |  | 981,729 | 981,729
Transfer from liability classification to equity classification | $ 590,217 |  | $ 4,231,324 |  | $ 4,231,324 | $ 4,821,542

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