CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 30,543	$ 22,058
Marketable securities	2,376	8,384
Prepaid expenses and other current assets	2,325	2,109
Total current assets	35,244	32,551
Property and equipment, net	1,789	1,873
Ownership interests in and advances to partner companies	161,625	183,470
Long-term marketable securities	3,047	7,302
Long-term restricted cash equivalents	6,336	6,336
Other assets	121	296
Total Assets	208,162	231,828
Current Liabilities:
Accounts payable	230	140
Accrued compensation and benefits	1,775	3,498
Accrued expenses and other current liabilities	2,017	2,223
Total current liabilities	4,022	5,861
Other long-term liabilities	3,581	3,630
Convertible senior debentures	52,983	52,560
Total Liabilities	60,586	62,051
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, 2017 and December 31, 2016	2,157	2,157
Additional paid-in capital	815,926	816,016
Treasury stock, at cost; 1,215 and 1,209 shares at March 31, 2017 and December 31, 2016, respectively	(21,123)	(21,061)
Accumulated deficit	(649,001)	(626,904)
Accumulated other comprehensive loss	(383)	(431)
Total Equity	147,576	169,777
Total Liabilities and Equity	$ 208,162	$ 231,828