Condensed Consolidated Statements of Cash Flows Statement - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income (loss) including noncontrolling interests in operating subsidiaries	$ (4,398)	$ (32,111)
Adjustments to reconcile net loss including noncontrolling interests in operating subsidiaries to net cash provided by operating activities:
Change in fair value of investment, net	(6,908)	41,097
Loss on Sale of Investments	5,590	0
Depreciation and amortization	660	5,344
Non-cash stock compensation	8	1,024
Increase (Decrease) in Debt Securities, Trading	(1,077)	0
Payments to Acquire Trading Securities Held-for-investment	60,193	0
Proceeds from (Payments for) Trading Securities, Short-term	3,339	0
Other	0	(87)
Changes in assets and liabilities:
Accounts receivable	8,920	(59)
Prepaid expenses and other assets	(541)	(863)
Accounts payable and accrued expenses	2,343	1,065
Royalties and contingent legal fees payable	(6,539)	36,608
Net cash provided by operating activities	(58,812)	49,970
Cash flows from investing activities:
Proceeds from Sale and Maturity of Other Investments	3,294	0
Payments to Acquire Other Investments	0	(7,000)
Purchase of available-for-sale investments	0	(33,309)
Maturities and sale of available-for-sale investments	0	4,000
Payments to Acquire Property, Plant, and Equipment	6	0
Net cash provided by (used in) investing activities	3,288	(36,309)
Cash flows from financing activities:
Repurchased Restricted Common Stock	0	7
Proceeds from exercises of stock options	0	31
Net cash used in financing activities	0	24
Increase (decrease) in cash and cash equivalents	(55,524)	13,685
Cash and cash equivalents, beginning	128,809	136,604
Cash and cash equivalents, ending	73,285	150,289
Patent acquisition costs included in accrued expenses	$ 3,750	$ 0