UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss including noncontrolling interests in subsidiaries	$ (5,143)	$ (10,155)
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)	(6,785)	(13,888)
Loss on sale of investment (Note 5)	2,762	7,232
Impairment of other investment	(0)	8,195
Depreciation and amortization	2,404	1,482
Amortization of debt discount and issuance costs	270	0
Loss on foreign currency exchange	4,890	0
Change in fair value of Series A redeemable convertible preferred stock embedded derivative	11,539	0
Change in fair value of Series A warrants	3,384	0
Change in fair value of Series B warrants	52,361	0
Non-cash stock compensation	755	453
Change in fair value of trading securities	2,592	(1,004)
Loss on sale of trading securities	7,009	0
Change in fair value of equity securities derivative and forward contract	(81,553)	0
Changes in assets and liabilities:
Accounts receivable	(882)	17,576
Prepaid expenses and other assets	877	(1,595)
Accounts payable and accrued expenses	(1,588)	1,606
Royalties and contingent legal fees payable	(35)	(12,170)
Net cash used in operating activities	(7,143)	(2,268)
Cash flows from investing activities:
Patent acquisition costs	(13,780)	(4,420)
Sale of investment at fair value (Note 5)	1,460	5,045
Purchases of trading securities	(31,317)	(75,154)
Maturities and sales of trading securities	299,227	11,396
Purchases of prepaid investment	(282,327)	0
Equity securities derivative and forward contract acquisition cost	(3,989)	0
Purchases of property and equipment	(148)	0
Net cash used in investing activities	(30,874)	(63,133)
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	(653)	0
Issuance of Series B warrants	4,600	0
Proceeds from exercise of stock options	48	79
Net cash provided by financing activities	109,938	79
Increase (decrease) in cash and cash equivalents and restricted cash	71,921	(65,322)
Cash and cash equivalents and restricted cash, beginning	92,359	128,809
Cash and cash equivalents and restricted cash, ending	164,280	63,487
Supplemental schedule of noncash investing activities:
Acquisition of prepaid investment securities	$ 183,587	$ 0