Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 109	$ 197
Marketable securities	3,409	3,998
Prepaid expenses and other assets	76	150
Total current assets	3,594	4,345
Property and equipment, net	1	3
Patent portfolios and patent rights, net	1,500	3,578
Investments at fair value	2,725	1,020
Deposit	26	26
Total assets	7,846	8,972
Current liabilities
Accounts payable and accrued expenses	68	56
Accrued salaries and benefits	578	695
Warrant liabilities	262	822
Payable to DatChat	348
Short-term deferred revenue		957
Short-term lease liabilities		48
Total current liabilities	1,256	2,578
Long-term deferred revenue		2,288
Total liabilities	1,256	4,866
Stockholders' equity
Common stock, $0.0001 par value, 100,000,000 shares authorized; 8,542,542 and 6,234,910 shares issued at September 30, 2018 and December 31, 2017, respectively; 8,542,530 and 6,234,898 shares outstanding at September 30, 2018 and December 31, 2017, respectively	1
Additional paid-in-capital	152,438	149,425
Treasury stock, at cost, 12 shares at September 30, 2018 and December 31, 2017	(264)	(264)
Accumulated deficit	(145,585)	(145,055)
Total stockholders' equity	6,590	4,106
Total liabilities and stockholders' equity	7,846	8,972
Series D Preferred Stock [Member]
Stockholders' equity
Preferred Stock
Series D-1 Convertible Preferred Stock [Member]
Stockholders' equity
Preferred Stock