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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net income (loss) $ (6,017) $ 63,260
Less: income (loss) from discontinued operations, net of tax (1,293) (96,008)
Net loss from continuing operations (4,724) (32,748)
Adjustments to reconcile net loss to net cash used in continuing operating activities:    
Depreciation and amortization 156 611
Write-off of patents and trademarks 59  
Share-based compensation 921 4,295
Other (78) (15)
Changes in operating assets and liabilities:    
Other assets 464  
Prepaid and other current assets 150 (9,012)
Accounts payable (654) (860)
Accrued expenses and other current liabilities (7,362) (739)
Other non-current liabilities (1,025) (125)
Total adjustments (7,369) (5,845)
Net cash used in continuing operating activities (12,093) (38,593)
Cash flows from investing activities:    
Payment of patent related costs   (267)
Purchase of fixed assets   (21)
Net cash used in continuing investing activities   (288)
Cash flows from financing activities:    
Proceeds from sale of common stock, net of costs 1,150  
Repayments of debt   (125,000)
Net cash (used in) provided by continuing financing activities 1,150 (125,000)
Discontinued operations:    
Net cash provided by (used in) operating activities (25,752) 124,875
Net cash provided by investing activities 0 187
Net cash provided by financing activities 1,107 0
Net cash provided by (used in) discontinued operations (24,645) 125,062
Net decrease in cash (35,588) (38,819)
Cash and restricted cash – continuing operations, beginning of period 49,317 65,122
Cash and restricted cash – discontinued operations, beginning of period 0 0
Total cash and restricted cash, end of period $ 13,729 26,303
Supplemental disclosure of cash flow information:    
Interest paid   0
Supplemental disclosure of noncash financing activities:    
Paid in kind ("PIK") debt financing fees with corresponding increase in debt   $ 15,780