CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 48,181	$ 22,058
Marketable securities	4,733	8,384
Prepaid expenses and other current assets	3,319	2,109
Total current assets	56,233	32,551
Property and equipment, net	1,705	1,873
Ownership interests in and advances to partner companies	148,029	183,470
Long-term marketable securities	689	7,302
Long-term restricted cash equivalents	6,336	6,336
Other assets	316	296
Total Assets	213,308	231,828
Current Liabilities:
Accounts payable	151	140
Accrued compensation and benefits	2,629	3,498
Accrued expenses and other current liabilities	1,942	2,223
Convertible senior debentures - current	42,320	0
Total current liabilities	47,042	5,861
Other long-term liabilities	3,580	3,630
Credit facility	44,514	0
Convertible senior debentures	0	52,560
Total Liabilities	95,136	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 June 30, 2017 and December 31, 2016	2,157	2,157
Additional paid-in capital	814,767	816,016
Treasury stock, at cost; 1,169 and 1,209 shares at June 30, 2017 and December 31, 2016, respectively	(20,276)	(21,061)
Accumulated deficit	(678,098)	(626,904)
Accumulated other comprehensive loss	(378)	(431)
Total Equity	118,172	169,777
Total Liabilities and Equity	$ 213,308	$ 231,828