Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenues	$ 9	$ 28
Operating costs and expenses
Amortization of patent portfolio		1,405
Selling, general and administrative	3,172	3,324
Research and development	2,522
Impairment of intangible assets		2,173
Total operating expenses	5,694	6,902
Loss from operations	(5,685)	(6,874)
Other income (expenses)
Other income (expenses), net	14	(333)
Change in fair value of investment	1,406	8,194
Change in fair value of warrant liabilities	82	740
Total other income	1,502	8,601
Net (loss) income	$ (4,183)	$ 1,727
Net income (loss) per share attributable to common stockholders, basic and diluted
Basic	$ (1.67)	$ .91
Diluted	$ (1.67)	$ 0.91
Weighted average number of shares outstanding,
Basic	2,511,566	1,896,057
Diluted	2,511,566	1,896,745