Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 9,498	$ 13,331
Restricted cash	19	25
Marketable securities	0	5,956
Ownership interests	0	860
Prepaid expenses and other current assets	394	1,251
Total current assets	9,911	21,423
Right-of-use asset, net	971	1,290
Ownership interests and advances	11,691	14,545
Other assets	263	434
Total Assets	22,836	37,692
Current Liabilities:
Accounts payable	107	16
Accrued compensation and benefits	854	507
Accrued expenses and other current liabilities	596	865
Lease liability - current	489	429
Total current liabilities	2,046	1,817
Lease liability - non-current	760	1,249
Other long-term liabilities	50	50
Total Liabilities	2,856	3,116
Commitments and contingencies (Note 11)
Equity:
Preferred stock, $0.10 par value; 1,000 shares authorized	0	0
Common stock, $0.10 par value; 83,333 shares authorized; 21,573 issued at December 31, 2023 and 2022, respectively	2,157	2,157
Additional paid-in capital	793,992	804,752
Treasury stock, at cost; 4,947 and 5,478 shares at December 31, 2023 and 2022, respectively	(42,418)	(48,410)
Accumulated deficit	(733,726)	(723,898)
Accumulated other comprehensive loss	(25)	(25)
Total Equity	19,980	34,576
Total Liabilities and Equity	$ 22,836	$ 37,692