Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net loss	$ (1,793)	$ (1,884)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of patent portfolio		681
Change in fair value of investment	330	(680)
Change in fair value of warrant liabilities	(74)	(465)
Stock-based compensation	115	286
Depreciation expense		17
Realized loss on marketable securities	98	275
Unrealized loss (gain) on marketable securities	(138)	17
Changes in assets and liabilities:
Prepaid expenses and other assets	82	4
Accounts payable and accrued expenses	100	150
Accrued salaries and benefits	(127)	(103)
Payable to DatChat	(207)
Accrued lease liabilities		(48)
Net cash used in operating activities	(1,614)	(1,750)
Cash flows from investing activities
Purchase of marketable securities	(4,954)	(10,047)
Sale of marketable securities	6,878	9,119
Purchase of investments at fair value	(550)	(25)
Purchase of property and equipment		(16)
Net cash provided by (used in) investing activities	1,374	(969)
Cash flows from financing activities
Cash from issuance common stock, net of offering cost	787	2,700
Net cash provided by financing activities	787	2,700
Net increase (decrease) in cash and cash equivalents	547	(19)
Cash and cash equivalents, beginning of period	17	197
Cash and cash equivalents, end of period	$ 564	$ 178