Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 4,949	$ 10,503
Marketable equity securities	412	9,155
Prepaid expenses and other current assets	376	404
Accounts and grants receivable	111	218
Total current assets	5,848	20,280
Property and equipment, net	2,529	2,949
Intangible assets, net	2,287	2,409
Operating lease asset	1,221	1,531
Other assets	193	244
Total assets	12,078	27,413
Current liabilities:
Accounts payable	638	1,751
Accrued expenses	2,152	650
Current portion of operating lease liability	593	564
Estimated lawsuit liability		1,398
Deferred revenue	506	506
Total current liabilities	3,889	4,869
Long-term liabilities:
Long-term portion of operating lease liability	1,448	2,041
Total long-term liabilities	1,448	2,041
Total liabilities	5,337	6,910
Commitments and contingencies (Note 9)
Stockholders’ Equity:
Preferred stock, $0.001 par value per share, 5,000,000 shares authorized, no shares issued and outstanding at June 30, 2023 and December 31, 2022
Additional paid-in capital	91,800	83,712
Stock subscription receivable	(100)	(100)
Accumulated deficit	(84,984)	(62,773)
Accumulated other comprehensive loss		(357)
Total stockholders’ equity	6,741	20,503
Total liabilities and stockholders’ equity	12,078	27,413
Class A Common Stock
Stockholders’ Equity:
Common stock value	10	6
Class B Common Stock
Stockholders’ Equity:
Common stock value	$ 15	$ 15