Consolidated Balance Sheets - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 3,444,952	$ 12,583,764
Other current assets	371,562	498,798
Total current assets	3,816,514	13,082,562
Property & equipment, net of accumulated depreciation of $2,443,600 and $2,099,389, respectively	50,000	837,867
Other long-term assets	0	496,269
Total assets	3,866,514	14,416,698
Current liabilities:
Accounts payable	377,956	739,850
Accrued expenses	625,890	1,008,077
Deferred revenue	0	2,905,165
Notes payable - Insurance	156,642	148,344
Total current liabilities	1,160,488	4,801,436
Total liabilities	1,160,488	4,801,436
Stockholders' equity:
Preferred stock, no par value, 10,000,000 shares authorized, none issued and outstanding	0	0
Common stock, $0.01 par value, 150,000,000 shares authorized, 7,141,054 and 6,982,909 shares issued and outstanding	71,411	69,829
Additional paid in capital	163,954,215	162,884,919
Accumulated deficit	(161,319,600)	(153,339,486)
Total stockholders' equity	2,706,026	9,615,262
Total liabilities and stockholders' equity	$ 3,866,514	$ 14,416,698