Consolidated Balance Sheets - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 5,798,000	$ 5,132,000
Prepaid expenses and other current assets	322,000	253,000
Total current assets	6,120,000	5,385,000
Property and equipment, net	678,000	816,000
In-process research and development	4,661,000	4,661,000
Acquired patents, net	261,000	276,000
Total assets	11,720,000	11,138,000
Current liabilities
Accounts payable	682,000	578,000
Accrued expenses	1,367,000	1,390,000
Total current liabilities	2,049,000	1,968,000
Derivative liabilities	185,000	292,000
Deferred tax liability	1,147,000	1,147,000
Total liabilities	3,381,000	3,407,000
Stockholders' equity
Common stock, $0.01 par value; 67,000,000 shares authorized at June 30, 2018 and December 31, 2017; 16,468,308 and 9,498,928 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively	165,000	95,000
Additional paid-in capital	408,564,000	401,842,000
Accumulated deficit	(400,390,000)	(394,206,000)
Total stockholders' equity	8,339,000	7,731,000
Total liabilities and stockholders' equity	$ 11,720,000	$ 11,138,000