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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Cash flows from operating activities:    
Net loss $ (8,983) $ (560)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization expense 485 941
Amortization of right of use of assets 415 397
Share-based compensation expense 98 109
Provision for doubtful accounts, net 79 0
Change of inventory to net realizable value 1,079 281
Loss on disposal of assets (82) (47)
Patent license proceeds 0 (4,000)
Changes in operating assets and liabilities:    
Receivables 4,992 324
Legal settlement receivable 0 55,000
Inventories (3,456) (2,381)
Prepaid expenses and other assets 192 3,752
Accounts payable (139) 661
Accrued liabilities (433) (497)
Income taxes receivable 26 1,035
Deferred product revenue (13) (33)
Operating lease liabilities (452) (425)
Other long-term liabilities 76 71
Net cash provided by (used in) operating activities (6,116) 54,628
Cash flows from investing activities:    
Purchase of marketable securities (5,229) (10,298)
Purchase of property and equipment (196) (375)
Purchase of intangibles (110) (135)
Proceeds from maturities and sales of marketable securities 9,724 5,925
Net cash provided by (used in) investing activities 4,189 (4,883)
Cash flows from financing activities:    
Dividend payment (14,496) (28,979)
Principal payments of long-term debt 0 (3,920)
Proceeds from equity-based compensation programs 23 7
Net cash used in financing activities (14,473) (32,892)
Effect of exchange rate changes on cash and cash equivalents (18) (2)
Net decrease in cash and cash equivalents (16,418) 16,851
Cash and cash equivalents at the beginning of the year 17,835 984
Cash and cash equivalents at the end of the year 1,417 17,835
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 29 6,905
Cash paid for interest $ 0 $ 343