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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:        
Net loss   $ (8,729) $ (9,462)  
Adjustments to reconcile net loss to net cash flows used in operating activities:        
Depreciation and amortization   829 838  
Amortization of operating lease right-of-use asset   161 176  
Amortization of finance lease right-of-use asset   38 46  
Amortization (accretion) of deferred financing costs, debt discounts and debt premiums   319 (8)  
Gain on settlement of liability, net $ 0 0 (1,251)  
Loss on litigation     266  
Loss on issuance of convertible notes     1,870  
Loss on extinguishment of convertible notes   1,225    
Stock-based compensation   541 455  
Provision for losses on doubtful accounts   1,025 724  
Warrant revaluation   293 19  
Loss on modification of warrants     1,128  
Derivative revaluation     415  
Gain from sale of fixed asset   (55)    
Changes in operating assets and liabilities:        
Accounts receivable   (1,537) (727)  
Inventories   (96) 15  
Other assets   (151) 302  
Accounts payable   (107) (1,624)  
Operating lease liabilities   (157) (170)  
Accrued expenses and other liabilities   418 (13)  
Net cash used in operating activities   (5,983) (7,001)  
CASH FLOWS FROM INVESTING ACTIVITIES:        
Purchase of property and equipment   (121) (49)  
Proceeds from sale of fixed asset   55    
Net cash used in investing activities   (66) (49)  
CASH FLOWS FROM FINANCING ACTIVITIES:        
Principal payments on finance lease obligations   (47) (44)  
Payment of deferred financing costs     (120)  
Payment of fractional common shares in conjunction with reverse stock split     (1)  
Issuance of common stock, net of issuance costs   6,921 5,171  
Proceeds from exercise of warrants     1,575  
Proceeds from long-term debt   787    
Proceeds from convertible notes     2,150  
Principal payments on convertible notes     (50)  
Principal payments on long-term debt   (302) (329)  
Net cash flows provided by financing activities   7,359 8,352  
NET CHANGE IN CASH   1,310 1,302  
CASH AT BEGINNING OF PERIOD   848 381 $ 381
CASH AT END OF PERIOD $ 2,158 2,158 1,683 $ 848
SUPPLEMENTAL CASH FLOW INFORMATION        
Cash paid during the period for interest   25 27  
SUPPLEMENTAL DISCLOSURE OF CONSULTING SERVICES OR ANY OTHER NON-CASH COMMON STOCK RELATED ACTIVITY        
Purchases of equipment financed through accounts payable     4  
Equipment financed through finance lease obligations   21 23  
Discount of 9% on issuance of convertible bridge notes     188  
Conversion of convertible debt into common stock   2,176 7,390  
Beneficial conversion feature on issuance of convertible notes     1,792  
Initial valuation of derivative liability recorded in conjunction with issuance of convertible notes     1,858  
Liabilities exchanged for convertible notes     2,150  
Prepaid insurance financed with loan   23 434  
Write-off of beneficial conversion feature in conjunction with convertible note extinguishment   523    
Right-of-use assets obtained in exchange for lease obligations   0 750  
Write-off warrant liability in conjunction with warrant exercises     2,364  
Write-off of debt discounts (net debt premiums) in conjunction with convertible note conversions   $ (270) 590  
Write-off of derivative liability in conjunction with convertible note conversions     $ 477