CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities:
Net loss	$ (15,629)	$ (88,572)
Adjustments to reconcile to net cash used in operating activities:
Depreciation	692	322
Amortization of debt discount	4,513	2,542
Equity (income) loss	(19,661)	66,358
Loss from increase in fair value of derivative	4,541	0
Gain from observable price changes	(1,415)	0
Other, net	(2,032)	(339)
Loss on sale of property and equipment	12	0
Stock-based compensation expense	966	1,138
Changes in assets and liabilities:
Prepaid expenses and other current assets	(2,065)	(3,560)
Accounts payable, accrued expenses, and other	(21)	628
Net cash used in operating activities	(26,035)	(20,805)
Cash Flows from Investing Activities:
Acquisitions of ownership interests in companies	(3,250)	(15,101)
Proceeds from sales of and distributions from companies	67,387	16,604
Advances and loans to companies	(13,104)	(22,867)
Repayment of advances and loans to companies	10,730	0
Purchase of marketable securities	(37,809)	0
Proceeds, from sales and maturities in securities	8,148	11,237
Proceeds from sales of property and equipment	1	0
Net cash provided by (used in) investing activities	32,103	(10,127)
Cash Flows from Financing Activities:
Proceeds from credit facility	35,000	50,000
Issuance costs of credit facility	(2,252)	(5,696)
Repayments on credit facility	(16,433)	0
Repurchase of convertible senior debentures	(41,000)	(14,455)
Tax withholdings related to equity-based awards	(267)	(223)
Issuance of Company common stock, net	0	1
Net cash provided by (used in) financing activities	(24,952)	29,625
Net change in cash, cash equivalents and restricted cash equivalents	(18,884)	(1,307)
Cash, cash equivalents and restricted cash equivalents at beginning of period	27,087	28,394
Cash, cash equivalents and restricted cash equivalents at end of period	$ 8,203	$ 27,087