CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 60,824	$ 111,897
Marketable securities	29,294	25,263
Prepaid expenses and other current assets	2,439	1,684
Total current assets	92,557	138,844
Property and equipment, net	333	123
Ownership interests in and advances to partner companies	171,483	154,192
Loan participations receivable	3,866	3,855
Long-term marketable securities	15,403	19,365
Other assets	1,976	2,075
Total Assets	285,618	318,454
Current Liabilities:
Accounts payable	238	226
Accrued compensation and benefits	2,449	3,997
Accrued expenses and other current liabilities	2,512	2,334
Total current liabilities	5,199	6,557
Other long-term liabilities	3,471	3,507
Convertible senior debentures	51,142	50,563
Total Liabilities	$ 59,812	$ 60,627
Commitments and contingencies
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, 2015 and December 31, 2014	2,157	2,157
Additional paid-in capital	819,995	819,757
Treasury stock, at cost; 856 and 921 shares at June 30, 2015 and December 31, 2014, respectively	(17,975)	(19,341)
Accumulated deficit	(578,371)	(544,746)
Total Equity	225,806	257,827
Total Liabilities and Equity	$ 285,618	$ 318,454