Consolidated Statements of Operations - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Consolidated Statement of Operations [Abstract]
Revenue		$ 38,000		$ 95,000
Operating expenses
Research and development (benefit)	$ 361,000		$ 3,517,000	1,791,000
Research and development benefit		(829,000)
General and administrative	1,276,000	1,613,000	4,227,000	6,295,000
Impairment charges				5,800,000
Total operating expenses	1,637,000	784,000	7,744,000	13,886,000
Loss from operations	(1,637,000)	(746,000)	(7,744,000)	(13,791,000)
Other income (expense)
Change in fair value of derivative liabilities	31,000	(37,000)	(46,000)	1,997,000
Other income, net		4,000		6,000
Total other income (expense), net	31,000	(33,000)	(46,000)	2,003,000
Loss before income taxes	(1,606,000)	(779,000)	(7,790,000)	(11,788,000)
Income tax benefit				1,302,000
Net loss	$ (1,606,000)	$ (779,000)	$ (7,790,000)	$ (10,486,000)
Per share information:
Net loss per share, basic	$ (0.10)	$ (0.09)	$ (0.51)	$ (1.97)
Weighted average shares outstanding, basic	16,468,308	8,874,813	15,418,146	5,326,139
Net loss per share, diluted	$ (0.10)	$ (0.09)	$ (0.51)	$ (2.18)
Weighted average shares outstanding, diluted	16,496,957	8,874,813	15,418,146	5,518,847