SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
12 Months Ended
Jun. 30, 2020
Accounting Policies [Abstract]  
Allowance for doubtful accounts activity
The allowance for doubtful accounts activity was as follows (in thousands):
 
 Years Ended June 30,
 202020192018
Beginning balance$203 $453 $440 
Charged to (released from) expenses85 (250)13 
Bad debt write-offs(85)  
Ending balance$203 $203 $453 
Estimated useful lives of property and equipment
The Company computes depreciation or amortization using the straight-line method over estimated useful lives, as follows:

   Estimated Useful Life
Testing equipment  
3 to 5 years
Computer and other equipment  
3 to 5 years
Furniture and fixtures  
3 to 5 years
Software
up to 3 years
Corporate aircraft
15 years
Leasehold improvementsshorter of lease term or useful life