Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net loss including noncontrolling interests in subsidiaries	$ (17,763)	$ (93,481)
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)	(9,622)	53,961
Impairment of other investment	8,195	1,000
Loss on sale of investment (Note 5)	8,147	3,705
Gain on disposal of other investment (Note 5)	(2,000)	0
Depreciation and amortization	2,344	15,582
Non-cash stock compensation	753	172
Change in value of trading securities	(914)	0
Purchases of trading securities	(103,718)	0
Maturities and sales of trading securities	38,816	0
Impairment of patent-related intangible assets	0	28,210
Other	0	(506)
Changes in assets and liabilities:
Accounts receivable	31,085	(5,877)
Prepaid expenses and other assets	(983)	(183)
Accounts payable and accrued expenses	326	1,052
Royalties and contingent legal fees payable	(20,414)	3,864
Net cash provided by (used in) operating activities	(65,748)	7,499
Cash flows from investing activities:
Patent acquisition costs	(4,420)	0
Sale of investment at fair value (Note 5)	6,260	10,440
(Purchase) Sale of other Investments (Note 5)	2,000	(7,000)
Purchases of available-for-sale investments	0	(65,883)
Maturities and sales of available-for-sale investments	0	32,508
Purchases of property and equipment	(119)	0
Net cash provided by (used in) investing activities	3,721	(29,935)
Cash flows from financing activities:
Repurchase of common stock	0	(4,634)
Repurchase of restricted common stock	0	(229)
Proceeds from exercise of stock options	79	257
Net cash provided by (used in) financing activities	79	(4,606)
Decrease in cash and cash equivalents	(61,948)	(27,042)
Cash and cash equivalents, beginning	128,809	136,604
Cash and cash equivalents, ending	$ 66,861	$ 109,562

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