Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities
Net loss	$ (1,149)	$ (1,486)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of patent portfolio		338
Change in fair value of investment	475
Change in fair value of warrant liabilities	53	(188)
Stock-based compensation	6	188
Depreciation expense		1
Realized loss on marketable securities	73	99
Unrealized loss (gain) on marketable securities	(148)	58
Changes in assets and liabilities:
Prepaid expenses and other assets	18	(78)
Accounts payable and accrued expenses	(10)	110
Accrued salaries and benefits	(84)	(70)
Payable to DatChat	(130)
Accrued lease liabilities		(48)
Net cash used in operating activities	(896)	(1,076)
Cash flows from investing activities
Purchase of marketable securities	(2,845)	(5,340)
Sale of marketable securities	4,365	3,607
Purchase of investments at fair value	(200)
Purchase of property and equipment		(25)
Net cash provided by (used in) investing activities	1,320	(1,758)
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 increase (decrease) in cash and cash equivalents	424	(134)
Cash and cash equivalents, beginning of period	22	197
Cash and cash equivalents, end of period	446	63
Cash paid for interest and taxes