CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows from Operating Activities:
Net loss	$ (59,524)	$ (5,149)	$ (35,525)
Adjustments to reconcile to net cash used in operating activities:
Depreciation	190	74	92
Amortization of debt discount	1,184	1,085	995
Equity loss	39,599	15,335	12,607
Other (income) loss, net	(217)	(31,657)	(383)
Stock-based compensation expense	1,611	1,935	1,821
Changes in assets and liabilities:
Accounts receivable, net	(923)	(369)	(1,194)
Accounts payable, accrued expenses, and other	331	(1,443)	366
Net cash used in operating activities	(17,749)	(20,189)	(21,221)
Cash Flows from Investing Activities:
Acquisitions of ownership interests in companies	(70,186)	(59,476)	(41,838)
Proceeds from sales of and distributions from companies	25,058	82,822	38,974
Advances and loans to companies	(15,208)	(10,968)	(10,464)
Repayment of advances and loans to companies	1,318	4,684	1,651
Increase in marketable securities	(29,755)	(55,594)	(69,883)
Decrease in marketable securities	33,640	55,410	165,379
Capital expenditures	(1,856)	(59)	(37)
Proceeds from sale of discontinued operations, net	0	0	6,434
Other, net	0	137	42
Net cash provided by (used in) investing activities	(56,989)	16,956	90,258
Cash Flows from Financing Activities:
Repurchase of convertible senior debentures	0	(441)	(43)
Issuance of Company common stock, net	676	1,289	4,417
Repurchase of Company common stock	(4,997)	(25,036)	(122)
Net cash provided by (used in) financing activities	(4,321)	(24,188)	4,252
Net change in cash and cash equivalents	(79,059)	(27,421)	73,289
Cash and cash equivalents at beginning of period	111,897	139,318	66,029
Cash and cash equivalents at end of period	$ 32,838	$ 111,897	$ 139,318