Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenues	$ 28	$ 1,236
Operating costs and expenses
Amortization of patent portfolio	1,405	1,373
Compensation and related expenses (including stock-based compensation)	1,012	2,059
Professional fees	1,569	1,038
Impairment of intangible assets	2,173
Rent	81	92
Depreciation expense	38	3
Acquisition costs	230
Other selling, general and administrative	394	493
Total operating expenses	6,902	5,058
Loss from operations	(6,874)	(3,822)
Other (expenses) income
Other (expenses) income , net	(333)	291
Change in fair value of investment	8,194	345
Change in fair value of warrant liabilities	740	(120)
Total other income	8,601	516
Net income (loss)	$ 1,727	$ (3,306)
Net income (loss) per share attributable to common stockholders, basic and diluted
Basic (in dollars per share)	$ 0.21	$ (0.60)
Diluted (in dollars per share)	$ 0.21	$ (0.60)
Weighted average number of common shares outstanding,
Basic (in shares)	8,058,165	5,538,568
Diluted (in shares)	8,061,091	5,538,568