Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 15,264	$ 27,053
Marketable investments	7,167	7,137
Funds receivable from New Jersey net operating loss	48	1,676
Prepaid expenses and other current assets	263	455
Total current assets	22,742	36,321
Property and equipment, net	136	195
Right of use asset, net	727	829
Patent and trademark rights, net	2,154	1,941
Other assets	2,102	1,202
Total assets	27,861	40,488
Current liabilities:
Accounts payable	2,788	377
Accrued expenses	1,721	806
Current portion of operating lease liability	207	178
Total current liabilities	4,716	1,361
Long-term liabilities:
Operating lease liability	543	659
Commitments and contingencies (Notes 12 and 13)
Stockholders’ equity:
Preferred Stock, $0.01 par value, 5,000,000 authorized shares, inclusive of the following:
Common Stock, $0.001 par value, authorized shares - 350,000,000; issued and outstanding shares 48,797,450 and 48,084,287 (including 133,333 and 561,104 of unvested stock awards) as of September 30, 2023 and December 31, 2022, respectively	48	48
Additional paid-in capital	418,796	418,270
Accumulated deficit	(396,932)	(380,546)
Total stockholders’ equity	22,602	38,468
Total liabilities and stockholders’ equity	27,861	40,488
Series A Junior Participating Preferred Stock [Member]
Stockholders’ equity:
Preferred Stock, $0.01 par value, 5,000,000 authorized shares, inclusive of the following:
Series B Convertible Preferred Stock [Member]
Stockholders’ equity:
Preferred Stock, $0.01 par value, 5,000,000 authorized shares, inclusive of the following:	$ 690	$ 696