UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income (loss) including noncontrolling interests in subsidiaries	$ 33,205	$ (17,763)
Adjustments to reconcile net income (loss) including noncontrolling interests in subsidiaries to net cash provided by (used in) operating activities:
Change in fair value of investment, net (Note 5)	(3,704)	(9,622)
Loss on sale of investment (Note 5)	2,762	8,147
Impairment of other investment	(0)	8,195
Gain on disposal of other investment (Note 5)	0	(2,000)
Depreciation and amortization	3,609	2,344
Amortization of debt discount and issuance costs	955	0
Change in fair value of Series A redeemable convertible preferred stock embedded derivative	7,708	0
Change in fair value of Series A warrants	2,036	0
Change in fair value of Series B warrants	36,867	0
Non-cash stock compensation	1,243	753
Loss on foreign currency exchange	4,938	0
Change in fair value of trading securities and equity securities - private	(81,907)	(914)
Loss on sale of trading securities	4,272	0
Change in fair value of equity securities derivative and forward contract	(17,542)	0
Gain on sale of prepaid investment and derivative	(2,845)	0
Changes in assets and liabilities:
Accounts receivable	248	31,085
Prepaid expenses and other assets	1,038	(983)
Accounts payable and accrued expenses	614	326
Royalties and contingent legal fees payable	12,052	(20,414)
Net cash provided by (used in) operating activities	5,549	(846)
Cash flows from investing activities:
Patent acquisition costs	(13,780)	(4,420)
Sale of investment at fair value (Note 5)	1,460	6,260
(Purchase) Sale of other investments (Note 5)	0	2,000
Purchases of trading securities	(33,800)	(103,718)
Maturities and sales of trading securities	316,746	38,816
Purchases of prepaid investment	(276,275)	0
Equity securities derivative and forward contract acquisition cost	(3,989)	0
Purchases of property and equipment	(177)	(119)
Net cash used in investing activities	(9,815)	(61,181)
Cash flows from financing activities:
Repurchase of common stock	(3,998)	0
Issuance of Senior Secured Notes, net of lender fee	110,437	0
Senior Secured Notes issuance costs paid to other parties	(496)	0
Dividend on Series A Redeemable Convertible Preferred Stock	(1,120)	0
Issuance of Series B warrants	4,600	0
Proceeds from exercise of stock options	48	79
Net cash provided by financing activities	109,471	79
Increase (decrease) in cash and cash equivalents and restricted cash	105,205	(61,948)
Cash and cash equivalents and restricted cash, beginning	92,359	128,809
Cash and cash equivalents and restricted cash, ending	197,564	66,861
Supplemental schedule of noncash investing activities:
Acquisition of prepaid investment securities	$ 231,480	$ 0