Fair Value - Marketable Securities by Major Security Type (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018
Marketable Securities [Line Items]
Held to Maturity	$ 62	$ 65
Available for Sale	8,415	9,947
Total	8,477	10,012
Corporate and Other Debt Securities [Member]
Marketable Securities [Line Items]
Held to Maturity	62	65
Available for Sale	8,415	9,947
Total	$ 8,477	$ 10,012

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26626-111562

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Amount of investment in debt security measured at amortized cost (held-to-maturity), classified as current.

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Amount of investment in marketable security, classified as current.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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