Fair Value of Financial Instruments - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Fair Value
Assets:
Fair value measurement disclosure	$ 1,056	$ 1,043
Certificates of Deposit [Member] | Fair Value
Assets:
Fair value measurement disclosure	1,056	1,043
Level 1
Assets:
Fair value measurement disclosure	0	0
Level 1 | Certificates of Deposit [Member]
Assets:
Fair value measurement disclosure	0	0
Level 2
Assets:
Fair value measurement disclosure	1,056	1,043
Level 2 | Certificates of Deposit [Member]
Assets:
Fair value measurement disclosure	1,056	1,043
Level 3
Assets:
Fair value measurement disclosure	0	0
Level 3 | Certificates of Deposit [Member]
Assets:
Fair value measurement disclosure	$ 0	$ 0