CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 66,231	$ 32,838
Marketable securities	14,462	31,020
Prepaid expenses and other current assets	2,345	5,810
Total current assets	83,038	69,668
Property and equipment, net	2,055	2,145
Ownership interests in and advances to partner companies	176,059	171,601
Loan participations receivable	2,845	2,649
Long-term marketable securities	10,680	9,743
Other assets	992	1,037
Total Assets	275,669	256,843
Current Liabilities:
Accounts payable	155	290
Accrued compensation and benefits	2,556	3,338
Accrued expenses and other current liabilities	2,550	2,789
Total current liabilities	5,261	6,417
Other long-term liabilities	4,010	3,965
Convertible senior debentures	51,740	50,956
Total Liabilities	61,011	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 June 30, 2016 and December 31, 2015	2,157	2,157
Additional paid-in capital	817,614	817,434
Treasury stock, at cost; 1,350 and 993 shares at June 30, 2016 and December 31, 2015, respectively	(23,759)	(19,570)
Accumulated deficit	(581,118)	(604,270)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(236)	(246)
Total Equity	214,658	195,505
Total Liabilities and Equity	$ 275,669	$ 256,843