Concentration Risk - Additional Information (Detail) - Customer Concentration Risk [Member]	3 Months Ended
Sep. 30, 2017 Customer
Sales Revenue, Goods, Net
Concentration Risk [Line Items]
Number of customers	3
Accounts Receivable [Member]
Concentration Risk [Line Items]
Number of customers	3

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration