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Consolidated Statements of Operations (Unaudited) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Statements Of Operations [Abstract] |  |
Revenue |  |
Operating expenses: |  |
Research and development, net of reimbursements | 4,048,714 us-gaap_ResearchAndDevelopmentExpense | 1,589,776 us-gaap_ResearchAndDevelopmentExpense
General and administrative | 3,806,405 us-gaap_GeneralAndAdministrativeExpense | 2,547,245 us-gaap_GeneralAndAdministrativeExpense
Depreciation expense | 10,395 us-gaap_Depreciation | 1,405 us-gaap_Depreciation
Total operating expenses | 7,865,514 us-gaap_OperatingExpenses | 4,138,426 us-gaap_OperatingExpenses
Loss from operations | (7,865,514)us-gaap_OperatingIncomeLoss | (4,138,426)us-gaap_OperatingIncomeLoss
Other income (expense): |  |
Interest expense | (5,727)us-gaap_InterestExpenseOther |
Gain (loss) on change in fair value of derivative liabilities | 4,796,378 us-gaap_DerivativeGainLossOnDerivativeNet | (12,561,071)us-gaap_DerivativeGainLossOnDerivativeNet
Total other income (expense) | 4,790,651 us-gaap_NonoperatingIncomeExpense | (12,561,071)us-gaap_NonoperatingIncomeExpense
Net loss | $ (3,074,863)us-gaap_NetIncomeLoss | $ (16,699,497)us-gaap_NetIncomeLoss
Net loss per common share - basic and diluted | $ (0.09)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.66)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average common shares outstanding - basic and diluted | 33,256,352 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 25,228,299 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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