Income Taxes - Deferred Tax Assets and Liabilities (Detail) - Deferred Tax Asset Liability [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Income Tax Benefit Expenses [Line Items]
Accounts receivable	$ 26	$ 26
Inventories	586	564
Accrued Liabilities	453	400
Stock based compensation expense	28	154
Intangibles	(258)	(14)
R&D credit	1,427	1,214
Property, plant and equipment	(579)	(503)
Other deferred tax liabilities	(1,039)	(702)
Deferred Tax Assets, Gross	644	1,139
Valuation allowance	0	0
Net deferred tax assets	$ 644	$ 1,139