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Summary of Business and Significant Accounting Policies - Concentration of Credit Risk (Detail) - Sales - customer
3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Concentration of Credit Risk        
Number of customers that accounted for more than ten percent of total revenue 1 1 1 1
Customer One        
Concentration of Credit Risk        
Concentration risk, percentage 17.00% 15.00% 16.00% 15.00%