Property and Equipment, Net - Components of Property and Equipment (Parenthetical) (Detail) $ in Thousands	Jun. 30, 2019 USD ($)
Office equipment [Member]
Property, Plant and Equipment [Line Items]
Right-of-use asset - financing lease	$ 249

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