Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities
Net income (loss)	$ 1,727	$ (3,306)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of patent portfolio	1,405	1,373
Change in fair value of investment	(8,194)	(345)
Change in fair value of warrant liabilities	(740)	120
Stock-based compensation	320	23
Depreciation expense	38	3
Realized loss on marketable securities	400	328
Unrealized loss (gain) on marketable securities	117	(240)
Impairment of intangible assets	2,173
Changes in assets and liabilities:
Prepaid expenses and other assets	(38)	(15)
Deposit
Accounts payable and accrued expenses	74	(67)
Accrued salaries and benefits	37	249
Deferred revenue		(1,216)
Accrued lease liabilities	(48)	(179)
Net cash used in operating activities	(2,729)	(3,272)
Cash flows from investing activities
Purchase of marketable securities	(14,280)	(12,274)
Sale of marketable securities	15,061	14,213
Purchase of investments at fair value	(922)	(675)
Release of deposit	26
Purchase of property and equipment	(36)
Net cash (used in) provided by investing activities	(151)	1,264
Cash flows from financing activities
Cash from issuance common stock, net of offering cost	2,700	2,095
Repurchase of restricted stock units to pay for employee withholding taxes		(24)
Net cash provided by financing activities	2,700	2,071
Net (decrease) increase in cash and cash equivalents	(180)	63
Cash and cash equivalents, beginning of period	197	134
Cash and cash equivalents, end of period	17	197
Cash paid for interest and taxes		195
Non-cash investing and financing activities
Investment in DatChat	207
Investment in Mellow Scooters	$ 2