Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 564	$ 17
Marketable securities	817	2,700
Prepaid expenses and other assets	106	188
Total current assets	1,487	2,905
Property and equipment, net		1
Investments	10,565	10,345
Total assets	12,052	13,251
Current liabilities
Accounts payable and accrued expenses	232	132
Accrued salaries and benefits	605	732
Warrant liabilities	8	82
Payable to DatChat		207
Total current liabilities	845	1,153
Total liabilities	845	1,153
Stockholders' equity
Preferred Stock
Common stock, 0.0001 par value, 100,000,000 shares authorized; 2,321,091 and 2,010,028 shares issued at June 30, 2019 and December 31, 2018; 2,321,088 and 2,010,025 shares outstanding at June 30, 2019 and December 31, 2018
Additional paid-in-capital	153,347	152,445
Treasury stock, at cost, 3 shares at March 31, 2019 and December 31, 2018	(264)	(264)
Accumulated deficit	(141,876)	(140,083)
Total stockholders' equity	11,207	12,098
Total liabilities and stockholders' equity	12,052	13,251
Series D Preferred Stock [Member]
Stockholders' equity
Preferred Stock
Series D-1 Preferred Stock [Member]
Stockholders' equity
Preferred Stock