Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenues	$ 311	$ 177	$ 638	$ 249
Operating costs and expenses
Amortization of patent portfolio	343	531	681	1,062
Compensation and related expenses (including stock-based compensation)	294	361	883	673
Professional fees	250	824	535	1,529
Rent	27	23	49	45
Other selling, general and administrative	174	60	236	123
Total operating expenses	1,088	1,799	2,384	3,432
Loss from operations	(777)	(1,622)	(1,746)	(3,183)
Other (expenses) income
Other income, net	121	55	293	25
Change in fair value of warrant liabilities	(1,204)	(511)	(1,326)	1,031
Total other (expenses) income	(1,083)	(456)	(1,033)	1,056
Net loss	(1,860)	(2,078)	(2,779)	(2,127)
Deemed capital contribution on extinguishment of preferred stock		31,480		31,480
Net income (loss) attributable to common stockholders	$ (1,860)	$ 29,402	$ (2,779)	$ 29,353
Net income (loss) per share attributable to common stockholders, basic and diluted
Basic (in dollars per share)	$ (0.38)	$ 9.61	$ (0.56)	$ 10.18
Diluted (in dollars per share)	$ (0.38)	$ 9.21	$ (0.56)	$ 9.32
Weighted average number of common shares outstanding
Basic (in shares)	4,958,159	3,060,455	4,951,083	2,883,160
Diluted (in shares)	4,958,159	3,193,227	4,951,083	3,147,022