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6. Warranty Reserve (Tables)
3 Months Ended
Sep. 30, 2019
Product Warranties Disclosures [Abstract]  
Schedule of warranty reserve
   Three Months Ended   Year Ended 
   September 30,   June 30, 
   2019   2019 
   (In thousands) 
Beginning balance  $116   $99 
Charged to cost of revenue   8    96 
Usage   (16)   (79)
Ending balance  $108   $116