Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 5,628,880	$ 4,084,085
Grants receivable	273,638	757,562
Prepaid expenses	339,176	419,751
Other current assets	0	47,586
Total current assets	6,241,694	5,308,984
Property and equipment, net	470,120	135,486
Goodwill	6,826,003	6,826,003
Other long term assets	148,597	126,654
Total assets	13,686,414	12,397,127
Current liabilities:
Accounts payable	2,014,606	3,002,497
Accrued compensation	463,828	562,755
Accrued clinical operations and site costs	472,990	391,041
Accrued lease contingency fee	590,504	590,504
License fee payable	225,000	225,000
Other accrued expenses	450,873	186,566
Interest payable	50,437	0
Notes payable - capital leases	16,051	0
Total current liabilities	4,284,289	4,958,363
Long-term liabilities:
Notes payable, net	3,980,437	0
Capital leases	79,605	0
Other long-term liabilities	102,863	0
Total long-term liabilities	$ 4,162,905	$ 0
Commitments and contingencies:
Stockholders' equity:
Common stock, $0.01 par value; 150,000,000 shares authorized, 29,311,272 and 28,391,072 shares issued and outstanding as of March 31, 2016 and December 31, 2015, respectively	$ 293,113	$ 283,911
Additional paid-in capital	69,950,489	67,754,383
Accumulated deficit	(65,006,548)	(60,601,778)
Total stockholders' equity	5,239,220	7,438,764
Total liabilities and stockholders' equity	13,686,414	12,397,127
Series D Convertible Preferred Stock [Member]
Stockholders' equity:
Preferred stock	1,833	1,915
Series E Convertible Preferred Stock [Member]
Stockholders' equity:
Preferred stock	$ 333	$ 333