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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Operating Activities |  |
Net loss | $ (140) | $ (1,458)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities: |  |
Depreciation | 161 | 154
Amortization | 31 | 30
Non-cash interest income on held-to-maturity securities | (72) | (203)
Stock-based compensation, net of forfeitures | 228 | 187
Changes in operating assets and liabilities: |  |
Accounts receivable | (334) | 966
Employee retention credit receivable | (1,677) | 0
Inventory | (24) | (135)
Prepaid expenses, other current assets and other non-current assets | 367 | 114
Accounts payable | 524 | 383
Accrued liabilities and other non-current liabilities | (1,728) | (21)
Net cash (used in) provided by operating activities | (2,664) | 17
Investing Activities |  |
Purchases of equipment and patents | (204) | (103)
Purchases of debt securities | (11,107) | (9,685)
Maturities of debt securities | 7,000 | 1,500
Net cash used in investing activities | (4,311) | (8,288)
Financing Activities |  |
Taxes paid on behalf of award participants | (95) | 0
Proceeds from exercise of stock options | 0 | 42
Net cash (used in) provided by financing activities | (95) | 42
Effect of exchange rate fluctuations on cash | (104) | 35
Net decrease in cash and cash equivalents | (7,174) | (8,194)
Cash and cash equivalents at beginning of period | 17,578 | 23,328
Cash and cash equivalents at end of period | $ 10,404 | $ 15,134

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