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Marketable Investment Securities - Additional Information (Detail) - USD ($) | Jun. 30, 2019 | Jun. 30, 2018
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Investments Debt And Equity Securities [Abstract] |  |
Gross unrealized loss position available for sale debt securities | $ 0 | $ 600,000

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- References No definition available. + Details
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