Consolidated Balance Sheets (Unaudited) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 37,349,000	$ 38,501,000
Marketable securities	499,000	501,000
Funds receivable from New Jersey net operating loss		1,090,000
Accounts receivable	28,000	34,000
Prepaid expenses and other current assets	161,000	184,000
Total current assets	38,037,000	40,310,000
Property and equipment, net	5,994,000	6,473,000
Right of use asset, net	144,000	179,000
Patent and trademark rights, net	1,845,000	1,498,000
Marketable securities, long term	15,811,000	15,376,000
Other assets	1,249,000	748,000
Total assets	63,080,000	64,584,000
Current liabilities:
Accounts payable	369,000	383,000
Accrued expenses	362,000	442,000
Current portion of operating lease liability	36,000	47,000
Current portion of financing obligation		230,000
Total current liabilities	767,000	1,102,000
Long-term liabilities:
Operating lease liability	108,000	132,000
Financing obligation arising from sale leaseback transaction (Note 13)		1,876,000
Redeemable warrants	158,000	180,000
Stockholders’ equity:
Series B Convertible Preferred Stock, stated value $1,000 per share, 725 shares designated, 732 shares issued and outstanding	725,000	732,000
Common Stock, par value $0.001 per share, authorized 350,000,000 shares: issued and outstanding 47,848,622, and 42,154,371, respectively	48,000	42,000
Additional paid-in capital	416,779,000	402,541,000
Accumulated other comprehensive loss	(250,000)	(47,000)
Accumulated deficit	(355,255,000)	(341,974,000)
Total stockholders’ equity	62,047,000	61,294,000
Total liabilities and stockholders’ equity	$ 63,080,000	$ 64,584,000