Fair Value - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018
Assets
Total available for sale debt securities	$ 8,415	$ 9,947
Fair Value, Measurements, Recurring [Member]
Assets
Money market funds (cash and cash equivalents)	1,756	154
Total available for sale debt securities	8,415	9,947
Fair Value, Measurements, Recurring [Member] \| Interest Rate Swap [Member]
Assets
Short-term derivative interest rate swap	562	407
Long-term derivative interest rate swap	917	2,183
Fair Value, Measurements, Recurring [Member] \| U.S. Corporate [Member]
Assets
Total available for sale debt securities	991	3,467
Fair Value, Measurements, Recurring [Member] \| Government - U.S. [Member]
Assets
Total available for sale debt securities	7,424	6,480
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Assets
Money market funds (cash and cash equivalents)	1,756	154
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Assets
Total available for sale debt securities	8,415	9,947
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Interest Rate Swap [Member]
Assets
Short-term derivative interest rate swap	562	407
Long-term derivative interest rate swap	917	2,183
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| U.S. Corporate [Member]
Assets
Total available for sale debt securities	991	3,467
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Government - U.S. [Member]
Assets
Total available for sale debt securities	$ 7,424	$ 6,480

Money market funds fair value.

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- References

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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.

+ References

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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- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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