Condensed Consolidated Balance Sheets - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 21,640,068	$ 27,092,928
Prepaid expenses and other	441,818	355,891
Total current assets	22,081,886	27,448,819
Property and equipment, net	566,020	229,591
Other assets	68,244	34,485
Total assets	22,716,150	27,712,895
Current liabilities:
Accounts payable	1,203,965	1,064,626
Accrued liabilities	302,644	250,950
Note payable, net of discount	1,496,885	0
Total current liabilities	3,003,494	1,315,576
Note payable, net of discount	0	1,491,278
Contingent rights derivative liability	4,134,931	4,122,266
Total liabilities	7,138,425	6,929,120
Commitments and contingencies
Stockholders' equity:
Convertible preferred stock, $1.00 par value; 5,000,000 shares authorized and 0 shares issued and outstanding at September 30, 2017 and December 31, 2016	0	0
Common stock, $.01 par value: 170,000,000 shares authorized; 60,276,119 shares issued at September 30, 2017 and December 31, 2016	602,760	602,760
Additional paid-in capital	470,663,323	470,147,086
Treasury stock, at cost: 79,545 shares held	(8,034,244)	(8,034,244)
Accumulated deficit	(447,654,114)	(441,931,827)
Total stockholders' equity	15,577,725	20,783,775
Total liabilities and stockholders' equity	$ 22,716,150	$ 27,712,895