CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 44,522	$ 20,751
Marketable securities	25,114	4,452
Trading securities	1,307	3,761
Prepaid expenses and other current assets	2,098	4,644
Total current assets	73,041	33,608
Property and equipment, net	1,293	1,513
Ownership interests in and advances to partner companies	103,702	134,691
Long-term restricted cash equivalents	0	6,336
Other assets	316	316
Total Assets	178,352	176,464
Current Liabilities:
Accounts payable	17	155
Accrued compensation and benefits	4,053	3,321
Accrued expenses and other current liabilities	2,213	1,851
Credit facility - current	16,433	0
Credit facility repayment feature	5,622	0
Convertible senior debentures	0	40,485
Total current liabilities	28,338	45,812
Credit facility - non-current	63,399	45,321
Other long-term liabilities	3,106	3,535
Total Liabilities	94,843	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 September 30, 2018 and December 31, 2017	2,157	2,157
Additional paid-in capital	811,131	812,536
Treasury stock, at cost; 926 and 999 shares at September 30, 2018 and December 31, 2017, respectively	(15,284)	(17,308)
Accumulated deficit	(714,482)	(715,476)
Accumulated other comprehensive loss	(13)	(113)
Total Equity	83,509	81,796
Total Liabilities and Equity	$ 178,352	$ 176,464