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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net loss | $ (12,178) | $ (8,517)
Adjustments to reconcile net loss to net cash flows used in operating activities: |  |
Depreciation and amortization | 1,219 | 1,131
Amortization of operating lease right-of-use asset | 187 | 219
Amortization of finance lease right-of-use asset | 114 | 94
Amortization of deferred financing costs, debt discounts and debt premiums | 4 | 3
Gain on forgiveness of debt |  | (794)
Gain on settlement of liability | (25) | (53)
Stock-based compensation | 3,801 | 1,879
Value of stock issued in payment of services |  | 150
Provision for losses on doubtful accounts | 406 | (150)
Warrant revaluation | (606) | (269)
Derecognition of finance lease right-of-use asset |  | 125
Changes in operating assets and liabilities: |  |
Accounts receivable | (745) | 327
Inventories | (144) | (214)
Other assets | 491 | (349)
Accounts payable | 165 | 112
Operating lease liabilities | (182) | (225)
Deferred revenue | 101 | 12
Accrued expenses | (329) | (58)
Net cash used in operating activities | (7,721) | (6,577)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Purchase of property and equipment | (277) | (682)
Net cash used in investing activities | (277) | (682)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Principal payments on finance lease obligations | (151) | (130)
Deposits on finance lease right-of-use assets |  | (39)
Issuance of common stock, net of issuance costs | 129 | 16,207
Proceeds from exercise of warrants | 11 | 400
Proceeds from exercise of stock options |  | 3
Principal payments on long-term debt | (214) | (40)
Payments on common stock warrant liabilities |  | (130)
Net cash flows (used in) provided by financing activities | (225) | 16,271
NET CHANGE IN CASH | (8,223) | 9,012
CASH AT BEGINNING OF PERIOD | 11,668 | 2,656
CASH AT END OF PERIOD | 3,445 | 11,668
SUPPLEMENTAL CASH FLOW INFORMATION |  |
Cash paid during the period for interest | 45 | 34
SUPPLEMENTAL DISCLOSURE OF CONSULTING SERVICES OR ANY OTHER NON-CASH COMMON STOCK RELATED ACTIVITY |  |
Purchases of equipment financed through accounts payable | 34 | 58
Prepaid insurance financed with loan | 413 |
Operating lease right-of-use assets obtained in exchange for operating lease obligations | 92 | 771
Finance lease right-of-use assets obtained in exchange for finance lease obligations | $ 12 | 347
Write-off warrant liability in conjunction with warrant exercises |  | $ 320

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