Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net loss including noncontrolling interests in subsidiaries	$ (10,155)	$ (60,617)
Adjustments to reconcile net loss including noncontrolling interests in subsidiaries to net cash provided by (used in) operating activities:
Change in fair value of investment, net (Note 5)	(13,888)	29,750
Change in value of other investment	8,195	1,000
Loss on sale of investment (Note 5)	7,232	0
Depreciation and amortization	1,482	10,627
Non-cash stock compensation	453	182
Unrealized gain from trading securities	(1,004)	0
Purchases of trading securities	(75,154)	0
Maturities and sales of trading securities	11,396	0
Impairment of patent-related intangible assets	0	28,210
Other	0	(313)
Changes in assets and liabilities:
Accounts receivable	17,576	(934)
Prepaid expenses and other assets	(1,595)	(571)
Accounts payable and accrued expenses	1,606	861
Royalties and contingent legal fees payable	(12,170)	1,436
Net cash provided by (used in) operating activities	(66,026)	9,631
Cash flows from investing activities:
Patent acquisition costs	(4,420)	0
Sale of investment (Note 5)	5,045	0
Investments in Investees (Note 5)	0	(7,000)
Purchases of available-for-sale investments	0	(49,895)
Maturities and sales of available-for-sale investments	0	15,400
Net cash provided by (used in) investing activities	625	(41,495)
Cash flows from financing activities:
Repurchase of common stock	0	(4,634)
Repurchase of restricted common stock	0	(7)
Proceeds from exercise of stock options	79	51
Net cash provided by (used in) financing activities	79	(4,590)
Decrease in cash and cash equivalents	(65,322)	(36,454)
Cash and cash equivalents, beginning	128,809	136,604
Cash and cash equivalents, ending	$ 63,487	$ 100,150

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