Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 15,601	$ 25,028
Restricted cash	0	25
Prepaid expenses and other current assets	462	1,297
Total current assets	16,063	26,350
Property and equipment, net	1,790	2,101
Ownership interests and advances	50,398	77,129
Other assets	784	1,997
Total Assets	69,035	107,577
Current Liabilities:
Accounts payable	56	39
Accrued compensation and benefits	2,677	1,364
Accrued expenses and other current liabilities	410	627
Lease liability - current	327	399
Total current liabilities	3,470	2,429
Other long-term liabilities	637	1,027
Lease liability - non-current	2,053	2,380
Total Liabilities	6,160	5,836
Commitments and contingencies (Note 12)
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, 2020 and 2019, respectively	2,157	2,157
Additional paid-in capital	807,582	810,856
Treasury stock, at cost; 688 and 930 shares at December 31, 2020 and 2019, respectively	(10,200)	(14,024)
Accumulated deficit	(736,639)	(697,223)
Accumulated other comprehensive loss	(25)	(25)
Total Equity	62,875	101,741
Total Liabilities and Equity	$ 69,035	$ 107,577