Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Income Tax Benefit Expenses [Line Items]
Accounts receivable	$ 17	$ 26
Inventories	437	586
Accrued Liabilities	233	453
Stock based compensation expense	15	28
Intangibles	(324)	(258)
R&D credit	781	1,427
Property, plant and equipment	(339)	(579)
Other deferred tax liabilities	(256)	(1,039)
Deferred Tax Assets, Gross	564	644
Valuation allowance	0	0
Net deferred tax assets	$ 564	$ 644