Consolidated Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Consolidated Statement of Operations [Abstract]
Revenue		$ 28,000		$ 57,000
Operating expenses
Research and development	$ 1,692,000	1,130,000	$ 3,156,000	2,620,000
General and administrative	1,360,000	2,784,000	2,951,000	4,682,000
Impairment charges		5,800,000		5,800,000
Total operating expenses	3,052,000	9,714,000	6,107,000	13,102,000
Loss from operations	(3,052,000)	(9,686,000)	(6,107,000)	(13,045,000)
Other income (expense)
Change in fair value of derivative liabilities	2,000	1,920,000	(77,000)	2,034,000
Other income, net		3,000		2,000
Total other income (expense), net	2,000	1,923,000	(77,000)	2,036,000
Loss before income taxes	(3,050,000)	(7,763,000)	(6,184,000)	(11,009,000)
Income tax benefit		1,302,000		1,302,000
Net loss	$ (3,050,000)	$ (6,461,000)	$ (6,184,000)	$ (9,707,000)
Per share information:
Net loss per share, basic	$ (0.19)	$ (1.21)	$ (0.42)	$ (2.76)
Weighted average number of shares outstanding, basic	16,464,675	5,350,930	14,890,164	3,514,181
Net loss per share, diluted	$ (0.19)	$ (1.46)	$ (0.42)	$ (3.09)
Weighted average number of shares outstanding, diluted	16,464,675	5,519,895	14,890,164	3,652,501