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Consolidated Statements of Operations (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended | 151 Months Ended | 157 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 | Jun. 30, 2013
Statements Of Operations [Abstract] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |
Operating expenses: |  |  |  |  |  |  |  |
Research and development, net of reimbursements | 509,262 | 601,272 | 1,594,968 | 1,046,158 | 3,440,485 | 323,788 | 26,420,519 | 28,015,488
General and administrative | 966,367 | 237,908 | 1,899,503 | 798,184 | 4,506,232 | 2,959,246 | 24,504,975 | 26,404,478
Depreciation and amortization expense |  | 159 |  | 317 | 581 | 633 | 3,262,462 | 3,262,462
Loss on disposition of equipment |  |  | 4,122 |  |  |  | 550,186 | 554,307
Total operating expenses | 1,475,629 | 839,339 | 3,498,593 | 1,844,659 | 7,947,298 | 3,283,667 | 54,738,142 | 56,236,735
Loss from operations | (1,475,629) | (839,339) | (3,498,593) | (1,844,659) | (7,947,298) | (3,283,667) | (54,738,142) | (56,236,735)
Other Income (Expense): |  |  |  |  |  |  |  |
Interest expense | (634) | (320,728) | (1,209) | (633,618) | 1,099,327 | 175,094 | 1,964,707 | (1,965,916)
Gain on extinguishment of liability |  |  |  |  |  |  | 260,000 | 260,000
Change in fair value - derivative liabilities | (1,307,748) | (402,524) | 26,764 | 6,777 | (685,420) | (13,966) | (699,386) | 726,150
Total other income (expense) | (1,308,382) | (723,252) | 25,555 | (626,841) | 413,907 | 161,128 | 1,005,321 | (979,766)
Net loss | $ (2,784,011) | $ (1,562,591) | $ (3,473,038) | $ (2,471,500) | $ (8,361,205) | $ (3,444,795) | $ (55,743,463) | $ (59,216,501)
Net loss per common share - basic and diluted | $ (0.13) | $ (0.09) | $ (0.16) | $ (0.15) | $ (7.58) | $ (4.30) |  |
Weighted average common shares outstanding - basic and diluted | 22,178,637 | 17,020,192 | 21,791,673 | 17,020,192 | 1,103,521 | 801,799 |  |

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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