CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 26,006	$ 20,751
Marketable securities	688	4,452
Trading securities	0	3,761
Prepaid expenses and other current assets	3,604	4,644
Total current assets	30,298	33,608
Property and equipment, net	1,357	1,513
Ownership interests in and advances to partner companies	110,432	134,691
Long-term restricted cash equivalents	0	6,336
Other assets	316	316
Total Assets	142,403	176,464
Current Liabilities:
Accounts payable	255	155
Accrued compensation and benefits	3,687	3,321
Accrued expenses and other current liabilities	2,086	1,851
Convertible senior debentures - current	0	40,485
Total current liabilities	6,028	45,812
Credit facility	78,978	45,321
Credit facility repayment feature liability	2,979	0
Other long-term liabilities	3,197	3,535
Total Liabilities	91,182	94,668
Commitments and contingencies (Note 10)
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 shares issued at June 30, 2018 and December 31, 2017	2,157	2,157
Additional paid-in capital	811,089	812,536
Treasury stock, at cost; 923 and 999 shares at June 30, 2018 and December 31, 2017, respectively	(15,451)	(17,308)
Accumulated deficit	(746,542)	(715,476)
Accumulated other comprehensive loss	(32)	(113)
Total Equity	51,221	81,796
Total Liabilities and Equity	$ 142,403	$ 176,464