CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 22,058	$ 32,838
Marketable securities	8,384	31,020
Prepaid expenses and other current assets	2,109	5,810
Total current assets	32,551	69,668
Property and equipment, net	1,873	2,145
Ownership interests in and advances to partner companies	183,470	171,601
Loan participations receivable	0	2,649
Long-term marketable securities	7,302	9,743
Long-term restricted cash equivalents	6,336	0
Other assets	296	1,037
Total Assets	231,828	256,843
Current Liabilities:
Accounts payable	140	290
Accrued compensation and benefits	3,498	3,338
Accrued expenses and other current liabilities	2,223	2,789
Total current liabilities	5,861	6,417
Other long-term liabilities	3,630	3,965
Convertible senior debentures—non-current	52,560	50,956
Total Liabilities	62,051	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 issued at December 31, 2016 and 2015, respectively	2,157	2,157
Additional paid-in capital	816,016	817,434
Treasury stock, at cost; 1,209 and 993 shares at December 31, 2016 and 2015, respectively	(21,061)	(19,570)
Accumulated deficit	(626,904)	(604,270)
Accumulated other comprehensive loss	(431)	(246)
Total Equity	169,777	195,505
Total Liabilities and Equity	$ 231,828	$ 256,843