Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Revenues	$ 877	$ 33
Operating costs and expenses
Amortization of patent portfolio	2,135	6,317
Compensation and related expenses (including stock-based compensation)	1,950	1,724
Professional fees	2,293	2,780
Impairment of goodwill and intangible assets	2,713	40,600
Rent	84	88
Other selling, general and administrative	253	534
Total operating expenses	9,428	52,043
Loss from operations	(8,551)	(52,010)
Other income (expenses)
Other (expenses) income, net	(182)	276
Change in fair value of warrant liabilities	2,257	269
Total other income	2,075	545
Net loss	(6,476)	(51,465)
Deemed dividend related to immediate accretion of beneficial conversion feature of convertible preferred stock		(323)
Deemed capital contribution on extinguishment of preferred stock	31,480	9,485
Net income (loss) attributable to common stockholders	$ 25,004	$ (42,303)
Net income (loss) per share attributable to common stockholders, basic and diluted
Basic (in dollars per share)	$ 6.76	$ (24.98)
Diluted (in dollars per share)	$ 6.51	$ (24.98)
Weighted average number of common shares outstanding,
Basic (in shares)	3,700,090	1,693,365
Diluted (in shares)	3,838,366	1,693,365