Fair Value - Summary of Gross Unrealized Losses and Fair Values of Available for Sale Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018
Schedule Of Available For Sale Securities Debt Maturities [Line Items]
Less than 12 Months, Fair Value	$ 3,476	$ 6,480
Less than 12 Months, Unrealized Loss	(3)	(6)
Government - U.S. [Member]
Schedule Of Available For Sale Securities Debt Maturities [Line Items]
Less than 12 Months, Fair Value	3,476	6,480
Less than 12 Months, Unrealized Loss	$ (3)	$ (6)

Schedule Of Available For Sale Securities Debt Maturities [Line Items]

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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

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- Definition

Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months.

+ References

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