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Business Risk and Credit Risk Concentration Involving Cash - Narrative (Details) | 12 Months Ended |
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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

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- Definition The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
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- References No definition available. + Details
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