Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 34,452	$ 32,093
Marketable securities	7,320	16,175
Funds receivable from New Jersey net operating loss		1,641
Prepaid expenses and other current assets	373	304
Assets held for sale	3,900
Total current assets	46,045	50,213
Property and equipment, net	127	4,047
Right of use asset, net	889	149
Patent and trademark rights, net	2,012	1,974
Other assets	1,811	1,316
Total assets	50,884	57,699
Current liabilities:
Accounts payable	712	198
Accrued expenses	502	438
Current portion of operating lease liability	154	37
Total current liabilities	1,368	673
Long-term liabilities:
Operating lease liability	735	112
Redeemable warrants	1	35
Commitments and contingencies (Notes 12, 13 and 14)
Stockholders’ equity:
Series B Convertible Preferred Stock, stated value $1,000 per share, 713 and 715 issued and outstanding, respectively	713	715
Common Stock, par value $0.001 per share, authorized 350,000,000 shares; 48,048,822 and 47,994,672, issued and outstanding, respectively	48	48
Additional paid-in capital	417,791	417,217
Accumulated deficit	(369,772)	(361,101)
Total stockholders’ equity	48,780	56,879
Total liabilities and stockholders’ equity	$ 50,884	$ 57,699