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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net loss $ (3,202) $ (3,472)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization expense 709 2,390
Amortization of right-of-use assets 306 449
Share-based compensation expense 80 90
Change of inventory to net realizable value 105 221
Gain recognized on Paycheck Protection Plan Loan forgiveness 0 (1,528)
Gain (loss) on disposal of assets and sale of marketable securities (12) 0
Changes in operating assets and liabilities:    
Receivables (271) 868
Legal settlement receivable 55,000 0
Inventories 29 710
Prepaid expenses and other assets 4,035 2,051
Accounts payable 475 (3,336)
Accrued liabilities (448) (54)
Income taxes receivable (5,310) 0
Deferred product revenue (25) 19
Operating lease liabilities (328) (468)
Net cash provided by (used in) operating activities 51,143 (2,060)
Cash flows from investing activities:    
Purchase of property and equipment (372) (17)
Purchase of intangibles (111) (93)
Capitalized patent defense costs 0 (642)
Proceeds from maturities and sales of marketable securities 3,094 3,008
Purchases of marketable securities (9,389) 0
Net cash provided by (used in) investing activities (6,778) 2,256
Cash flows from financing activities:    
Dividend payment (28,979) 0
Net proceeds from equity-based compensation programs 4 3
Paycheck Protection Program loan refund upon full forgiveness net of loan payments 0 768
Principal payments of debt (2,675) (540)
Net cash provided by (used in) financing activities (31,650) 231
Effect of exchange rate changes on cash and cash equivalents (5) (48)
Net increase in cash and cash equivalents 12,710 379
Cash and cash equivalents at the beginning of the period 984 1,071
Cash and cash equivalents at the end of the period 13,694 1,450
The following is a summary of supplemental cash flow activities:    
Cash paid for income taxes 6,650 68
Cash paid for interest $ 311 $ 140