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Commitments and Contingencies - Other Commitments (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Contractual obligations and commitments    
Future payments for non-cancellable contractual agreements in next fiscal year $ 1,300  
Warranty    
Warranty period, maximum 1 year  
UNITED STATES    
Employee benefit plans    
Employee contribution from salary 60.00%  
Employer contributions to 401(k) plan $ 464 $ 339
Defined Contribution Plan, Tax Status [Extensible List] us-gaap:QualifiedPlanMember us-gaap:QualifiedPlanMember
Foreign Plans    
Employee benefit plans    
Defined contribution plans' expenses $ 441 $ 431