Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating activities:
Net loss	$ (8,629,780)	$ (11,052,427)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization and depreciation	183,960	171,666
Warrants issued to vendors	4,775
Change in fair value of warrant liability	203,703	5,349,422
Issuances of common stock for acquisition of in-process research and development	4,000,000
Issuances of common stock	106,042	1,559,588
Stock-based compensation	458,914	571,171
Change in operating assets and liabilities:
Grants receivable	(470,957)	177,473
Taxes receivable	750,356
Prepaid expenses	(70,116)	(57,367)
Accounts payable	1,539,036	90,082
Accrued compensation	(173,755)	26,059
Total adjustments	6,531,958	7,888,094
Net cash used in operating activities	(2,097,822)	(3,164,333)
Investing activities:
Purchase of office equipment	(47,025)	(10,539)
Net cash used in investing activities	(47,025)	(10,539)
Financing activities:
Proceeds from sale of common stock, net		6,216,762
Net proceeds from common stock pursuant to the equity line	470,475
Proceeds from exercise of warrants and options	28,079	184,286
Net cash provided by financing activities	498,554	6,401,048
Net increase (decrease) in cash and cash equivalents	(1,646,293)	3,226,176
Cash and cash equivalents at beginning of period	5,856,242	3,356,380
Cash and cash equivalents at end of period	4,209,949	6,582,556
Supplemental disclosure of non cash investing and financing activities:
Warrants issued in unit offering		4,827,788
Reclassification of warrant liability to additional paid in capital relating to warrants exercised	$ 1,055,490	$ 201,311