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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (6,315) $ (8,729)
Adjustments to reconcile net loss to net cash flows used in operating activities:    
Depreciation and amortization 835 829
Amortization of operating lease right-of-use asset 162 161
Amortization of finance lease right-of-use asset 44 38
Amortization of deferred financing costs, debt discounts and debt premiums 2 319
Gain on forgiveness of debt (794)  
Gain on settlement of liability (47)  
Loss on extinguishment of convertible notes   1,225
Stock-based compensation 1,310 541
Value of stock issued in payment of services 150  
Provision for losses on doubtful accounts 82 1,025
Warrant revaluation 434 293
Derecognition of finance lease right-of-use asset 60  
Gain from sale of fixed asset   (55)
Changes in operating assets and liabilities:    
Accounts receivable 222 (1,537)
Inventories (330) (96)
Finance lease right-of-use assets (41)  
Other assets (354) (151)
Accounts payable (156) (107)
Operating lease liabilities (167) (157)
Accrued expenses and other liabilities (274) 418
Net cash used in operating activities (5,177) (5,983)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (624) (121)
Proceeds from sale of fixed asset   55
Net cash used in investing activities (624) (66)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on finance lease obligations (79) (47)
Issuance of common stock, net of issuance costs 16,207 6,921
Proceeds from exercise of warrants 400  
Proceeds from exercise of stock options 3  
Proceeds from PPP Loan   787
Principal payments on long-term debt (33) (302)
Payments on common stock warrant liabilities (130)  
Net cash flows provided by financing activities 16,368 7,359
NET CHANGE IN CASH 10,567 1,310
CASH AT BEGINNING OF PERIOD 2,656 848
CASH AT END OF PERIOD 13,223 2,158
SUPPLEMENTAL CASH FLOW INFORMATION    
Cash paid during the period for interest 22 25
SUPPLEMENTAL DISCLOSURE OF CONSULTING SERVICES OR ANY OTHER NON-CASH COMMON STOCK RELATED ACTIVITY    
Purchases of equipment financed through accounts payable 35  
Equipment financed through finance lease obligations   21
Conversion of convertible debt, plus interest, into common stock   2,176
Prepaid insurance financed with loan   23
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 $ 346  
Write-off of (debt premiums) debt discounts, net, in conjunction with convertible note conversions   $ (270)