Intangible Assets, Net - Schedule of Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Cost	$ 2,730	$ 2,536
Accumulated Amortization	(1,717)	(1,568)
Intangible assets, net	1,013	968
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	2,392	2,193
Accumulated Amortization	(1,499)	(1,357)
Intangible assets, net	893	836
Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	289	289
Accumulated Amortization	(199)	(182)
Intangible assets, net	90	107
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	49	54
Accumulated Amortization	(19)	(29)
Intangible assets, net	$ 30	$ 25