Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenue		$ 115,000
Operating expenses
Research and development	$ 4,892,000	2,881,000
General and administrative	5,702,000	7,590,000
Impairment charges	1,930,000	5,800,000
Total operating expenses	12,524,000	16,271,000
Loss from operations	(12,524,000)	(16,156,000)
Other expense
Change in fair value of derivative liabilities	86,000	2,010,000
Other expense, net		6,000
Total other income (expense), net	86,000	2,016,000
Loss before income taxes	(12,438,000)	(14,140,000)
Income tax benefit	328,000	1,302,000
Net loss	$ (12,110,000)	$ (12,838,000)
Per share information:
Net loss per share, basic	$ (0.64)	$ (2.01)
Weighted average shares outstanding, basic	18,980,796	6,387,425
Net loss per share, diluted	$ (0.64)	$ (2.18)
Weighted average shares outstanding, diluted	19,059,895	6,574,117