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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 $ (6,778) $ (9,895)
Adjustments to reconcile net loss to net cash flows used in operating activities:    
Depreciation and amortization 931 910
Amortization of operating lease right-of-use asset 153 139
Amortization of finance lease right-of-use asset 63 99
Amortization of deferred financing costs, debt discounts and debt premiums 2 3
Gain on settlement of liability   (4)
Stock-based compensation 1,168 3,405
Provision for losses on doubtful accounts 175 245
Warrant revaluation   (578)
Changes in operating assets and liabilities:    
Accounts receivable (622) (503)
Inventories 72 (99)
Other assets 306 341
Accounts payable 468 235
Operating lease liabilities (150) (136)
Deferred revenue (90) (5)
Accrued expenses 629 (378)
Net cash used in operating activities (3,673) (6,221)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (77) (225)
Net cash used in investing activities (77) (225)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on finance lease obligations (62) (124)
Issuance of common stock, net of issuance costs 2,245 129
Proceeds from exercise of warrants   11
Principal payments on long-term debt (316) (94)
Net cash flows provided by (used in) financing activities 1,867 (78)
NET CHANGE IN CASH (1,883) (6,524)
CASH AT BEGINNING OF PERIOD 3,445 11,668
CASH AT END OF PERIOD 1,562 5,144
SUPPLEMENTAL CASH FLOW INFORMATION    
Cash paid during the period for interest 29 32
SUPPLEMENTAL DISCLOSURE OF CONSULTING SERVICES OR ANY OTHER NON-CASH COMMON STOCK RELATED ACTIVITY    
Purchases of equipment financed through accounts payable 3 34
Prepaid insurance financed with loan 372 413
Operating lease right-of-use assets obtained in exchange for operating lease obligations $ 58 $ 92