Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 2,972,051	$ 4,084,085
Grants receivable	0	757,562
Prepaid expenses	276,714	419,751
Other current assets	3,965	47,586
Total current assets	3,252,730	5,308,984
Property and equipment, net	515,522	135,486
Goodwill	6,826,003	6,826,003
Other long term assets	346,233	126,654
Total assets	10,940,488	12,397,127
Current liabilities:
Accounts payable	2,161,127	3,002,497
Accrued compensation	482,528	562,755
Accrued clinical operations and site costs	491,157	391,041
Accrued lease contingency fee	590,504	590,504
License fee payable	225,000	225,000
Other accrued expenses	412,373	186,566
Interest payable	50,500	0
Current portion of notes payable	(694,444)	0
Current portion of capital leases payable	16,303	0
Total current liabilities	5,123,936	4,958,363
Long-term liabilities:
Long-term portion of notes payable, net	4,087,760	0
Long-term portion of capital leases	76,799	0
Other long-term liabilities	115,452	0
Total long-term liabilities	3,585,567	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	307,878	283,911
Additional paid-in capital	70,715,564	67,754,383
Accumulated deficit	(68,794,523)	(60,601,778)
Total stockholders' equity	2,230,985	7,438,764
Total liabilities and stockholders' equity	10,940,488	12,397,127
Series D Convertible Preferred Stock [Member]
Stockholders' equity:
Preferred stock	$ 1,733	1,915
Series E Convertible Preferred Stock [Member]
Stockholders' equity:
Preferred stock		$ 333