Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenues	$ 314	$ 314	$ 952	$ 563
Operating costs and expenses
Amortization of patent portfolio	346	536	1,027	1,598
Compensation and related expenses (including stock-based compensation)	488	836	1,371	1,509
Professional fees	280	343	815	1,872
Rent	21	20	70	65
Other selling, general and administrative	138	65	374	188
Total operating expenses	1,273	1,800	3,657	5,232
Loss from operations	(959)	(1,486)	(2,705)	(4,669)
Other (expenses) income
Other income, net	6	16	299	41
Change in fair value of investment	345		345
Change in fair value of warrant liabilities	1,067	1,024	(259)	2,055
Total other (expenses) income	1,418	1,040	385	2,096
Net income (loss)	459	(446)	(2,320)	(2,573)
Deemed capital contribution on extinguishment of preferred stock				31,480
Net income (loss) attributable to common stockholders	$ 459	$ (446)	$ (2,320)	$ 28,907
Net income (loss) per share attributable to common stockholders, basic and diluted
Basic (in dollars per share)	$ 0.08	$ (0.11)	$ (0.44)	$ 8.72
Diluted (in dollars per share)	$ 0.08	$ (0.11)	$ (0.44)	$ 8.25
Weighted average number of common shares outstanding
Basic (in shares)	5,998,920	4,163,245	5,304,201	3,312,969
Diluted (in shares)	6,009,042	4,163,245	5,304,201	3,503,735