CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 28,163	$ 32,838
Marketable securities	10,936	31,020
Prepaid expenses and other current assets	5,159	5,810
Total current assets	44,258	69,668
Property and equipment, net	2,087	2,145
Ownership interests in and advances to partner companies	182,851	171,601
Loan participations receivable	2,627	2,649
Long-term marketable securities	3,250	9,743
Other assets	1,037	1,037
Total Assets	236,110	256,843
Current Liabilities:
Accounts payable	220	290
Accrued compensation and benefits	1,748	3,338
Accrued expenses and other current liabilities	3,315	2,789
Total current liabilities	5,283	6,417
Other long-term liabilities	4,030	3,965
Convertible senior debentures	51,344	50,956
Total Liabilities	$ 60,657	$ 61,338
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 March 31, 2016 and December 31, 2015	2,157	2,157
Additional paid-in capital	818,271	817,434
Treasury stock, at cost; 1,420 and 993 shares at March 31, 2016 and December 31, 2015, respectively	(24,997)	(19,570)
Accumulated deficit	(619,722)	(604,270)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(256)	(246)
Total Equity	175,453	195,505
Total Liabilities and Equity	$ 236,110	$ 256,843