Business Risk and Credit Risk Concentration Involving Cash - Narrative (Details)	12 Months Ended
Jun. 30, 2018 Customer	Jun. 30, 2017 Customer	Oct. 31, 2008 USD ($)
Risks And Uncertainties [Abstract]
Revenue from number of customers \| Customer	2	2
FDIC increased insurance amount per depositor \| $			$ 250,000

The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

No definition available.

Name:	us-gaap_CashFDICInsuredAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant