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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (5,323) $ (6,722)
Adjustments to reconcile net loss to net cash flows used in operating activities:    
Depreciation and amortization 621 604
Amortization of operating lease right-of-use asset 99 93
Amortization of finance lease right-of-use asset 43 67
Amortization of deferred financing costs, debt discounts and debt premiums 1 2
Gain on settlement of liability   (1)
Stock-based compensation 802 2,683
Provision for losses on doubtful accounts 124 165
Warrant revaluation   (519)
Changes in operating assets and liabilities:    
Accounts receivable 28 (595)
Inventories 171 (78)
Other assets 192 207
Accounts payable 353 692
Operating lease liabilities (97) (90)
Deferred revenue (102) (5)
Accrued expenses 311 (483)
Net cash used in operating activities (2,777) (3,980)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (54) (106)
Net cash used in investing activities (54) (106)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on finance lease obligations (44) (95)
Issuance of common stock, net of issuance costs 2,245  
Principal payments on long-term debt (242) (14)
Net cash flows provided by (used in) financing activities 1,959 (109)
NET CHANGE IN CASH (872) (4,195)
CASH AT BEGINNING OF PERIOD 3,445 11,668
CASH AT END OF PERIOD 2,573 7,473
SUPPLEMENTAL CASH FLOW INFORMATION    
Cash paid during the period for interest 18 19
SUPPLEMENTAL DISCLOSURE OF CONSULTING SERVICES OR ANY OTHER NON-CASH COMMON STOCK RELATED ACTIVITY    
Purchases of equipment financed through accounts payable 7 7
Operating lease right-of-use assets obtained in exchange for operating lease obligations $ 58 $ 92