Intangible Assets, Net - Schedule of Intangible Assets, Net as of the Dates Indicated (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Cost	$ 2,985	$ 2,730
Accumulated Amortization	(1,887)	(1,717)
Intangible assets, net	1,098	1,013
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	2,637	2,392
Accumulated Amortization	(1,649)	(1,499)
Intangible assets, net	988	893
Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	289	289
Accumulated Amortization	(214)	(199)
Intangible assets, net	75	90
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	59	49
Accumulated Amortization	(24)	(19)
Intangible assets, net	$ 35	$ 30