Condensed Consolidated Statements of Operations (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
License revenue	$ 38,095us-gaap_LicensesRevenue	$ 38,095us-gaap_LicensesRevenue
Research and development:
Noncash compensation	1,337,908	1,901,610
Other research and development	8,279,431	2,508,258
Total research and development	9,617,339us-gaap_ResearchAndDevelopmentExpense	4,409,868us-gaap_ResearchAndDevelopmentExpense
General and administrative:
Noncash compensation	4,019,120	2,329,828
Other general and administrative	1,004,487	903,524
Total general and administrative	5,023,607us-gaap_GeneralAndAdministrativeExpense	3,233,352us-gaap_GeneralAndAdministrativeExpense
Total costs and expenses	14,640,946us-gaap_OperatingExpenses	7,643,220us-gaap_OperatingExpenses
Operating loss	(14,602,851)us-gaap_OperatingIncomeLoss	(7,605,125)us-gaap_OperatingIncomeLoss
Other (income) expense:
Interest income	(22,132)us-gaap_InterestIncomeOther	(13,474)us-gaap_InterestIncomeOther
Other income	0us-gaap_OtherIncome	(95,427)us-gaap_OtherIncome
Interest expense	237,657us-gaap_InterestExpense	226,340us-gaap_InterestExpense
Change in fair value of notes payable	(240,641)	(175,315)
Total other income	(25,116)us-gaap_NonoperatingIncomeExpense	(57,876)us-gaap_NonoperatingIncomeExpense
Net loss	$ (14,577,735)us-gaap_ProfitLoss	$ (7,547,249)us-gaap_ProfitLoss
Basic and diluted net loss per common share (in dollars per share)	$ (0.35)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.25)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average shares used in computing basic and diluted net loss per common share (in shares)	41,088,752	30,091,000

The change in the fair value of non current notes payable recognized during the period.

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