Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net loss	$ (1,486)	$ (919)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of patent portfolio	338	338
Change in fair value of warrant liabilities	(188)	122
Stock-based compensation	188	4
Depreciation expenses	1	1
Realized loss on marketable securities	99	93
Unrealized loss (gain) on marketable securities	58	(72)
Changes in assets and liabilities:
Prepaid expenses and other assets	(78)	(10)
Accounts payable and accrued expenses	110	52
Accrued salaries and benefits	(70)	(107)
Deferred revenue		(307)
Accrued lease liabilities	(48)	(40)
Net cash used in operating activities	(1,076)	(845)
Cash flows from investing activities
Purchase of marketable securities	(5,340)	(4,121)
Sale of marketable securities	3,607	5,042
Purchase of investment at fair value	(25)
Net cash (used in) provided by investing activities	(1,758)	921
Cash flows from financing activities
Cash from issuance common stock, net of offering cost	2,700
Net cash provided by financing activities	2,700
Net (decrease) increase in cash and cash equivalents	(134)	76
Cash and cash equivalents, beginning of period	197	134
Cash and cash equivalents, end of period	63	210
Cash paid for interest and taxes