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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:    
Net income (loss) $ (560) $ 20,556
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization expense 941 2,970
Amortization of right of use of assets 397 597
Share-based compensation expense 109 113
Change of inventory to net realizable value 281 120
Loss on disposal of assets (47) 146
Gain recognized on Paycheck Protection Plan Loan forgiveness 0 (1,528)
Gain on legal settlement proceeds, net of capitalized legal costs less amortization (4,000) (33,623)
Changes in operating assets and liabilities:    
Receivables 324 1,388
Legal settlement receivable 55,000 0
Inventories (2,381) 1,812
Prepaid expenses and other assets 3,752 684
Accounts payable 661 (4,104)
Accrued liabilities (497) 485
Income taxes receivable 1,035 6,466
Deferred product revenue (33) 9
Operating lease liabilities (425) (623)
Other long-term liabilities 71 353
Net cash provided by (used in) operating activities 54,628 (4,179)
Cash flows from investing activities:    
Purchase of marketable securities (10,298) 0
Purchase of property and equipment (375) (51)
Purchase of intangibles (135) (137)
Capitalized patent defense costs 0 (737)
Proceeds from maturities and sales of marketable securities 5,925 3,010
Net cash provided by (used in) investing activities (4,883) 2,085
Cash flows from financing activities:    
Dividend payment (28,979) 0
Principal payments of long-term debt (3,920) (720)
Proceeds from issuance of short-term notes 0 2,000
Proceeds from Paycheck Protection Program loan 0 767
Proceeds from equity-based compensation programs 7 4
Net cash provided by (used in) financing activities (32,892) 2,051
Effect of exchange rate changes on cash and cash equivalents (2) (44)
Net decrease in cash and cash equivalents 16,851 (87)
Cash and cash equivalents at the beginning of the year 984 1,071
Cash and cash equivalents at the end of the year 17,835 984
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 6,905 88
Cash paid for interest 343 226
Supplemental disclosure of non-cash investing and financing activities    
Right-of-use assets obtained in exchange for lease obligations 0 107
Issue of common stock in consideration of cancellation of debt $ 0 $ 2,000