Balance Sheet Detail - Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Jun. 30, 2014
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 15,447	$ 14,792
Accumulated depreciation and amortization	(14,051)	(13,710)
Property and equipment, net	1,396	1,082
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,073	3,991
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,900	5,456
Demonstration equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,848	1,605
Office furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	938	1,052
Software development costs [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,688	$ 2,688