CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 7,703	$ 20,751
Restricted cash	500	0
Marketable securities	37,955	4,452
Trading securities	0	3,761
Prepaid expenses and other current assets	2,669	4,644
Total current assets	48,827	33,608
Property and equipment, net	808	1,513
Ownership interests in and advances to partner companies	95,585	134,691
Long-term restricted cash equivalents	0	6,336
Other assets	517	316
Total Assets	145,737	176,464
Current Liabilities:
Accounts payable	165	155
Accrued compensation and benefits	3,433	3,321
Accrued expenses and other current liabilities	2,182	1,851
Credit facility - current	22,100	0
Credit facility repayment feature	5,060	0
Convertible senior debentures	0	40,485
Total current liabilities	32,940	45,812
Other long-term liabilities	2,804	3,535
Credit facility - non-current	43,014	45,321
Total Liabilities	78,758	94,668
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, 2018 and 2017, respectively	2,157	2,157
Additional paid-in capital	810,928	812,536
Treasury stock, at cost; 914 and 999 shares at December 31, 2018 and 2017, respectively	(15,001)	(17,308)
Accumulated deficit	(731,105)	(715,476)
Accumulated other comprehensive loss	0	(113)
Total Equity	66,979	81,796
Total Liabilities and Equity	$ 145,737	$ 176,464