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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net income (loss) $ (9,395) $ 34,295
Less: income (loss) from discontinued operations, net of tax (3,237) 81,674
Net loss from continuing operations (6,158) (47,379)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 285 884
Write-off of patents and trademarks 59  
Share-based compensation 1,155 8,587
Other 525 (25)
Changes in operating assets and liabilities:    
Other assets 1,185  
Prepaid and other current assets (1,241) 394
Accounts payable (1,466) (1,290)
Accrued expenses and other current liabilities (11,918) 18,337
Lease liabilities (629)  
Other non-current liabilities 82 (385)
Total adjustments (11,963) 26,502
Net cash used in continuing operating activities (18,121) (20,877)
Cash flows from investing activities:    
Payment of patent related costs   (260)
Purchase of fixed assets   (21)
Net cash used in continuing investing activities   (281)
Cash flows from financing activities:    
Proceeds from sale of common stock, net of costs 1,149 2,454
Proceeds from exercise of options and warrants 0 14
Repayments of debt   (125,000)
Payment of debt financing fees   (729)
Net cash provided by (used in) continuing financing activities 1,149 (123,261)
Discontinued operations:    
Net cash provided by (used in) operating activities (22,179) 117,573
Net cash provided by investing activities 0 54
Net cash provided by financing activities 0 0
Net cash provided by (used in) discontinued operations (22,179) 117,627
Net decrease in cash (39,151) (26,792)
Cash, cash equivalents and restricted cash - continuing operations, beginning of period 49,317 65,122
Cash, cash equivalents and restricted cash - continuing operations, beginning of period 0  
Total cash and restricted cash, end of period 10,166 38,330
Supplemental disclosure of cash flow information:    
Interest paid $ 0  
Supplemental disclosure of noncash financing activities:    
Paid in kind ("PIK") interest with corresponding increase in debt   2,452
PIK debt financing fees with corresponding increase in debt   16,980
Issue of warrants to lenders related to debt financing fees   $ 1,983