Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenue:
Revenue from licensing agreements	$ 20,997us-gaap_Revenues	$ 23,584us-gaap_Revenues
Operating expenses:
Research and development	6,292,191us-gaap_ResearchAndDevelopmentExpense	4,629,673us-gaap_ResearchAndDevelopmentExpense
General and administrative	2,689,196us-gaap_GeneralAndAdministrativeExpense	2,236,014us-gaap_GeneralAndAdministrativeExpense
Total operating expenses	8,981,387us-gaap_OperatingExpenses	6,865,687us-gaap_OperatingExpenses
Loss from operations	(8,960,390)us-gaap_OperatingIncomeLoss	(6,842,103)us-gaap_OperatingIncomeLoss
Other income (expense):
Change in fair value of warrant liability	(347,330)us-gaap_FairValueAdjustmentOfWarrants	(326,624)us-gaap_FairValueAdjustmentOfWarrants
Interest income	1,394us-gaap_InvestmentIncomeInterest	2,185us-gaap_InvestmentIncomeInterest
Interest expense	(185,356)us-gaap_InterestExpense	(380,488)us-gaap_InterestExpense
Other income (expense), net	140,981us-gaap_OtherNonoperatingIncomeExpense	(15,498)us-gaap_OtherNonoperatingIncomeExpense
Total other expense, net	(390,311)us-gaap_NonoperatingIncomeExpense	(720,425)us-gaap_NonoperatingIncomeExpense
Net loss from continuing operations	(9,350,701)	(7,562,528)
Discontinued operations:
Loss from discontinued operations		(57,728)
Net loss	$ (9,350,701)us-gaap_NetIncomeLoss	$ (7,620,256)us-gaap_NetIncomeLoss
Basic and diluted net loss per share:
Basic and diluted net loss per share from continuing operations	$ (0.14)	$ (0.14)
Basic and diluted net loss per share from discontinued operations	$ 0	$ 0
Basic and diluted net loss per share	$ (0.14)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.14)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average number of common shares outstanding, basic and diluted	69,219,964	55,343,877

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

No definition available.