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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss including noncontrolling interests in subsidiaries $ (144,205) $ (5,143)
Adjustments to reconcile net loss including noncontrolling interests in subsidiaries to net cash used in operating activities:    
Change in fair value of investment, net 0 (6,785)
(Gain) loss on sale of investment (839) 2,762
Depreciation and amortization 4,547 2,404
Amortization of debt discount and issuance costs 128 270
Change in fair value of Series A redeemable convertible preferred stock embedded derivative 14,463 11,539
Change in fair value of Series A warrants 11,824 3,384
Change in fair value of Series B warrants 178,198 52,361
Non-cash stock compensation 979 755
Loss on foreign currency exchange 176 4,890
Change in fair value of equity securities (49,007) (78,961)
(Gain) loss on sale of equity securities (15,436) 7,009
Earnings on equity investment in joint venture, net of distributions received (907) 0
Changes in assets and liabilities:    
Accounts receivable (12,244) (882)
Prepaid expenses and other assets (627) 877
Accounts payable and accrued expenses 2,826 (1,588)
Royalties and contingent legal fees payable 3,927 (35)
Net cash used in operating activities (6,197) (7,143)
Cash flows from investing activities:    
Patent acquisition (11,000) (13,780)
Sale of investment at fair value 3,591 1,460
Purchases of equity securities (27,871) (31,317)
Maturities and sales of equity securities 33,467 299,227
Purchases of prepaid investment 0 (282,327)
Equity securities derivative and forward contract acquisition cost 0 (3,989)
Purchases of property and equipment (45) (148)
Net cash used in investing activities (1,858) (30,874)
Cash flows from financing activities:    
Repurchase of common stock 0 (3,998)
Issuance of Senior Secured Notes, net of lender fee 30,000 110,437
Senior Secured Notes issuance costs paid to other parties 0 (496)
Dividend on Series A Redeemable Convertible Preferred Stock (523) (653)
Issuance of Series B warrants 0 4,600
Proceeds from exercise of stock options 94 48
Paydown of Senior Secured Notes - short term (50,000) 0
Reissuance of Senior Secured Notes - short term 50,000 0
Net cash provided by financing activities 29,571 109,938
Increase in cash and cash equivalents and restricted cash 21,516 71,921
Cash and cash equivalents and restricted cash, beginning 200,546 92,359
Cash and cash equivalents and restricted cash, ending 222,062 164,280
Supplemental schedule of cash flow information:    
Interest paid 2,340 0
Income taxes paid 9 164
Noncash investing activities:    
Patent acquisition in exchange of notes receivable 4,000 0
Patent acquisition accrued liability - short term 10,000 0
Patent acquisition accrued liability - long term 5,000 0
Acquisition of prepaid investment securities $ 0 $ 183,587