Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 446	$ 22
Marketable securities	1,256	2,700
Prepaid expenses and other assets	165	183
Total current assets	1,867	2,905
Property and equipment, net		1
Investments	10,070	10,345
Total assets	11,937	13,251
Current liabilities
Accounts payable and accrued expenses	122	132
Accrued salaries and benefits	648	732
Warrant liabilities	135	82
Payable to DatChat	77	207
Total current liabilities	982	1,153
Total liabilities	982	1,153
Stockholders' equity
Common stock, 0.0001 par value, 100,000,000 shares authorized; 2,010,028 shares issued at March 31, 2019 and December 31, 2018; 2,010,025 shares outstanding at March 31, 2019 and December 31, 2018
Additional paid-in-capital	152,451	152,445
Treasury stock, at cost, 3 shares at March 31, 2019 and December 31, 2018	(264)	(264)
Accumulated deficit	(141,232)	(140,083)
Total stockholders' equity	10,955	12,098
Total liabilities and stockholders' equity	11,937	13,251
Series D Preferred Stock [Member]
Stockholders' equity
Preferred Stock
Series D-1 Convertible Preferred Stock [Member]
Stockholders' equity
Preferred Stock