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BUSINESS ACTIVITY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Warranty Liabilities (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Product Warranty Liability [Line Items]    
Period of right to return defective products 3 years  
Product warranty liability beginning of period $ 29,000 $ 65,000
Accruals for warranties issued 7,000 29,000
Change in estimates   (37,000)
Settlements made (3,000) (28,000)
Product warranty liability end of the period $ 33,000 $ 29,000
Maximum    
Product Warranty Liability [Line Items]    
Warranty period 3 years  
Minimum    
Product Warranty Liability [Line Items]    
Warranty period 1 year