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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net loss $ (734) $ (3,603)
Less: income (loss) from discontinued operations, net of tax 75 (1,293)
Net loss from continuing operations (809) (2,310)
Adjustments to reconcile net loss to net cash used in operating activities of continuing operations:    
Depreciation and amortization 133 27
Write-off of patents and trademarks 59
Share-based compensation 111 483
Other 186 (60)
Changes in operating assets and liabilities:    
Other assets 629 (19)
Prepaid and other current assets 34 (1,453)
Accounts payable 112 164
Accrued expenses and other current liabilities (413) (4,486)
Lease liabilities (213)
Other non-current liabilities 1 (1,106)
Total adjustments 580 (6,391)
Net cash used in continuing operating activities (229) (8,701)
Discontinued operations:    
Net cash provided by (used in) operating activities 240 (24,474)
Net cash provided by financing activities 0 1,106
Net cash provided by (used in) discontinued operations 240 (23,368)
Net decrease in cash 11 (32,069)
Cash and cash equivalents, beginning of period 4,327 49,317
Total cash and cash equivalents, end of period $ 4,338 $ 17,248