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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2017
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Tax Credit Carryforward [Line Items]        
Accrued deferred taxes, undistributed earnings and profits   $ 794 $ 794  
Reductions as a result of a lapse of the applicable statute of limitations     273 $ 0
Settlements of previously recognized positions     793 $ 0
Domestic Tax Authority | Research and development credit carryforwards        
Tax Credit Carryforward [Line Items]        
Tax credit carryforwards   406 $ 406  
Domestic Tax Authority | Research and development credit carryforwards | Maximum        
Tax Credit Carryforward [Line Items]        
Tax carryforward expiration year     2033  
State and Local Jurisdiction | Research and development credit carryforwards        
Tax Credit Carryforward [Line Items]        
Tax credit carryforwards   13,008 $ 13,008  
IRS        
Tax Credit Carryforward [Line Items]        
Reductions as a result of a lapse of the applicable statute of limitations   273    
Settlements of previously recognized positions   $ 793    
Subsequent Event | IRS        
Tax Credit Carryforward [Line Items]        
Refund in connection with the conclusion of the IRS examination $ 1,598