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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (1,451) $ (3,205)
Adjustments to reconcile net loss to net cash flows used in operating activities:    
Depreciation and amortization 268 281
Amortization of operating lease right-of-use asset 53 56
Amortization of finance lease right-of-use asset 11 17
Amortization of deferred financing costs, debt discounts and debt premiums 2 664
Gain on forgiveness of debt (794)  
Gain on settlement of liability (17)  
Loss on extinguishment of convertible notes   1,225
Stock-based compensation 437 168
Value of stock issued in payment of services 150  
Provision for losses on doubtful accounts 288 268
Warrant revaluation 118 (936)
Derecognition of finance lease right-of-use asset 29  
Changes in operating assets and liabilities:    
Accounts receivable (39) (577)
Inventories (122) (11)
Finance lease right-of-use assets (29)  
Other assets (177) 75
Accounts payable 194 250
Operating lease liabilities (54) (51)
Accrued expenses and other liabilities (156) 187
Net cash used in operating activities (1,289) (1,589)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (185) (24)
Net cash used in investing activities (185) (24)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on finance lease obligations (12) (23)
Issuance of common stock, net of issuance costs 1,260 1,350
Principal payments on long-term debt (14) (145)
Payments on common stock warrant liabilities (130)  
Net cash flows provided by financing activities 1,104 1,182
NET CHANGE IN CASH (370) (431)
CASH AT BEGINNING OF PERIOD 2,656 848
CASH AT END OF PERIOD 2,286 417
SUPPLEMENTAL CASH FLOW INFORMATION    
Cash paid during the period for interest 5 8
SUPPLEMENTAL DISCLOSURE OF CONSULTING SERVICES OR ANY OTHER NON-CASH COMMON STOCK RELATED ACTIVITY    
Purchases of equipment financed through accounts payable 82  
Conversion of convertible debt, plus interest, into common stock   353
Write-off of beneficial conversion feature in conjunction with convertible note extinguishment   523
Finance lease right-of-use assets obtained in exchange for finance lease obligations $ 96  
Write-off of debt discounts (debt premiums), net, in conjunction with convertible note conversions   $ 63