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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net loss $ (3,603) $ (49,021)
Less: Loss from discontinued operations, net of tax 1,293 31,146
Net income (loss) from continuing operations (2,310) (17,875)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 27 329
Write-off of patents and trademarks 59  
Share-based compensation 483 2,061
Other (60) (7)
Changes in operating assets and liabilities:    
Other assets (19)  
Prepaid and other current assets (1,453) 1,052
Accounts payable 164 (502)
Accrued expenses and other current liabilities (4,486) (2,930)
Other non-current liabilities (1,106)  
Total adjustments (6,391) 3
Net cash used in continuing operating activities (8,701) (17,872)
Cash flows from investing activities:    
Payment of patent related costs   (170)
Purchase of fixed assets   (42)
Net cash used in continuing investing activities   (212)
Cash flows from financing activities:    
Repayments of debt   (5,000)
Net cash used in continuing financing activities   (5,000)
Discontinued operations:    
Net cash used in operating activities (24,474) (11,654)
Net cash provided by financing activities 1,106 0
Net cash used in discontinued operations (23,368) (11,654)
Net (decrease) increase in cash (32,069) (34,738)
Cash and restricted cash - continuing operations, beginning of period 49,317 65,122
Cash and restricted cash - discontinued operations, beginning of period
Total cash and restricted cash, end of period $ 17,248 30,384
Supplemental disclosure of cash flow information:    
Interest paid   5,364
Supplemental disclosure of noncash financing activities:    
Paid in kind ("PIK") debt financing fees with corresponding increase in debt   $ 30,000