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BUSINESS ACTIVITY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]    
Total revenues $ 3,474 $ 1,757
Equipment upon delivery | Point in time    
Disaggregation of Revenue [Line Items]    
Total revenues 3,433 1,722
Installation | Point in time    
Disaggregation of Revenue [Line Items]    
Total revenues $ 41 $ 35