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Segment, Customers, and Geographic Information - Major Customer Accounts Receivable as Percentage of Accounts Receivable (Parenthetical) (Detail)
6 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Maximum [Member]    
Revenue, Major Customer [Line Items]    
Concentration Risk, Percentage 10.00% 10.00%