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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Cash flows from Operating Activities: |  |
Net loss | $ (4,384,000) | $ (21,941,000)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 345,000 | 1,903,000
Bad debt (recovery) expense | (52,000) | 118,000
Non-cash lease expense from right-of-use assets | 125,000 | 349,000
Stock-based compensation | 504,000 | 146,000
Forfeiture of unvested stock options | 0 | (85,000)
Loss (gain) on disposal of assets | 3,000 | (2,000)
Casualty loss on inventory | 0 | 483,000
Impairment charges - property and equipment | 0 | 61,000
Impairment charges - intangible assets | 259,000 | 5,133,000
Impairment charges - right-of use assets | 0 | 179,000
Impairment charges - goodwill | 0 | 7,367,000
Changes in assets and liabilities: |  |
Accounts receivable | 43,000 | 316,000
Prepaid expenses and other current assets | 406,000 | 432,000
Inventory | 484,000 | 615,000
Other assets | 28,000 | 69,000
Accounts payable | 27,000 | (75,000)
Accrued expenses and other current liabilities | (170,000) | 115,000
Deferred revenue | (392,000) | (614,000)
Lease liabilities | (219,000) | (503,000)
Net cash used in operating activities | (2,993,000) | (5,934,000)
Cash flows from Investing Activities: |  |
Proceeds on sale of equipment | 0 | 30,000
Purchases of property and equipment | 0 | (11,000)
Net cash provided by investing activities | 0 | 19,000
Cash flows from Financing Activities: |  |
Proceeds from private placement, net of issuance costs | 5,364,000 | 0
Net proceeds from exercise of common stock warrants | 534,000 | 0
Net cash provided by financing activities | 5,898,000 | 0
Net increase (decrease) in cash and cash equivalents | 2,905,000 | (5,915,000)
Cash and restricted cash at beginning of year | 3,085,000 | 9,000,000
Cash and cash equivalents at end of year | 5,990,000 | 3,085,000
Supplemental disclosures of cash flow information: |  |
Cash paid during the period for interest | 20,000 | 7,000
Cash paid for income taxes | 31,000 | 0
Reconciliation of cash and cash equivalents |  |
Cash | 5,490,000 | 3,085,000
Current certificates of deposit | 500,000 | 0
Total cash and cash equivalents | 5,990,000 | 3,085,000
Non-cash investing and financing activities: |  |
New operating lease agreement | 0 | 11,000
Preferred stock dividends | 343,000 | 0
Warrant modification | 25,000 | 0
Induced exercise of common stock warrants | 751,000 | 0
Common stock issued for conversion of Preferred Stock and accrued dividends | $ 209,000 | $ 0

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