Commitments and Contingencies - Additional Information (Detail)	6 Months Ended
Dec. 31, 2018 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Claims made against the company	$ 0

Amount awarded to other party in judgment or settlement of litigation.

No definition available.

Name:	us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration