Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Revenues	$ 314		$ 563	$ 2
Operating costs and expenses
Amortization of patent portfolio	536	722	1,598	5,594
Compensation and related expenses (including stock-based compensation)	836	336	1,509	1,001
Professional fees	343	787	1,872	2,067
Impairment of goodwill and intangible assets				37,212
Rent	20	22	65	66
Other selling, general and administrative	65	92	188	440
Total operating expenses	1,800	1,959	5,232	46,380
Loss from operations	(1,486)	(1,959)	(4,669)	(46,378)
Other income (expenses)
Other income, net	16	7	41	32
Change in fair value of warrant liabilities	1,024	(774)	2,055	(774)
Total other income (expenses)	1,040	(767)	2,096	(742)
Net loss	(446)	(2,726)	(2,573)	(47,120)
Deemed capital contribution on extinguishment of preferred stock			31,480
Net (loss) income attributable to common stockholders	$ (446)	$ (2,726)	$ 28,907	$ (47,120)
Net (loss) income per share attributable to common stockholders, basic and diluted
Basic (in dollars per share)	$ (0.11)	$ (1.56)	$ 8.72	$ (29.70)
Diluted (in dollars per share)	$ (0.11)	$ (1.56)	$ 8.25	$ (29.70)
Weighted average number of common shares outstanding
Basic (in shares)	4,163,245	1,744,394	3,312,969	1,586,373
Diluted (in shares)	4,163,245	1,744,394	3,503,735	1,586,373