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The following tables reconcile the balances as previously reported in the Quarterly Reports on Form 10-Q as of and for the three months ended March 31, 2022 and as of and for the three and six months ended June 30, 2022 to the as revised balances: (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Revenues $ 6,251 $ 4,863 $ 6,362 $ 5,685 $ 11,225 $ 17,476 $ 14,813      
Cost of goods sold 5,390 4,800 5,439 4,972 10,239 15,629 13,445      
Gross profit 861 62 923 713 986 1,847 1,368      
Net loss $ (1,311) $ (2,536) $ (740) $ (434) $ (3,275) $ (4,586) $ (769)      
Loss per share - basic $ (0.13) $ (0.26) $ (0.08) $ (0.05) $ (0.34) $ (0.47) $ (0.09)      
Loss per share - diluted $ (0.13) $ (0.26) $ (0.08) $ (0.05) $ (0.34) $ (0.47) $ (0.09)      
Weighted average common shares outstanding - basic 9,770 9,728 9,641 8,726 9,685 9,713 8,726      
Weighted average common shares outstanding - diluted 9,770 9,728 9,641 8,726 9,685 9,713 8,726      
Total current assets $ 26,451 $ 30,210 $ 31,884   $ 30,210 $ 26,451   $ 25,135    
Total assets 29,445 33,246 34,705   33,246 29,445   27,927    
Total current liabilities 12,299 14,796 14,393   14,796 12,299   6,582    
Total liabilities 13,603 16,236 15,819   16,236 13,603   8,375    
Total stockholders’ equity 15,842 17,010 18,886 $ 12,172 17,010 15,842 $ 12,172 19,552 $ 12,548 $ 13,859
Changes in current operating assets and liabilities:                    
Inventories     (2,527)   (3,987) (4,319) (1,097)      
Deferred revenue     4,569   5,966 4,198 1,549      
Net cash used in operating activities     2,087   (1,621) (3,936) $ (991)      
Accumulated deficit $ (16,898) (15,587) (13,052)   (15,587) $ (16,898)   $ (12,312)    
Previously Reported [Member]                    
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Revenues   4,289 6,036   10,325          
Cost of goods sold   4,208 5,161   9,369          
Gross profit   81 875   956          
Net loss   $ (2,517) $ (788)   $ (3,305)          
Loss per share - basic   $ (0.26) $ (0.08)   $ (0.34)          
Loss per share - diluted   $ (0.26) $ (0.08)   $ (0.34)          
Weighted average common shares outstanding - basic   9,728 9,641   9,685          
Weighted average common shares outstanding - diluted   9,728 9,641   9,685          
Total current assets   $ 31,080 $ 32,162   $ 31,080          
Total assets   34,116 34,983   34,116          
Total current liabilities   15,696 14,719   15,696          
Total liabilities   17,136 16,145   17,136          
Total stockholders’ equity   16,980 18,838   16,980          
Changes in current operating assets and liabilities:                    
Inventories     (2,805)   (4,857)          
Deferred revenue     4,895   6,866          
Net cash used in operating activities     2,087   (1,621)          
Accumulated deficit   (15,617) (13,100)   (15,617)          
Revision of Prior Period, Adjustment [Member]                    
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Revenues   574 326   900          
Cost of goods sold   592 278   870          
Gross profit   (19) 48   30          
Net loss   (19) 48   30          
Total current assets   (870) (278)   (870)          
Total assets   (870) (278)   (870)          
Total current liabilities   (900) (326)   (900)          
Total liabilities   (900) (326)   (900)          
Total stockholders’ equity   30 48   30          
Changes in current operating assets and liabilities:                    
Inventories     278   870          
Deferred revenue     (326)   (900)          
Net cash used in operating activities                
Accumulated deficit   $ 30 $ 48   $ 30