BALANCE SHEET COMPONENTS - Property and Equipment, Net (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Jun. 30, 2014
Property, Plant and Equipment [Line Items]
Property and equipment gross	$ 20,670	$ 12,369
Less: Accumulated depreciation and amortization	(6,911)	(5,109)
Property and equipment, net	13,759	7,260
Testing equipment
Property, Plant and Equipment [Line Items]
Property and equipment gross	4,619	3,785
Computer and other equipment
Property, Plant and Equipment [Line Items]
Property and equipment gross	4,011	1,019
Tooling equipment
Property, Plant and Equipment [Line Items]
Property and equipment gross	3,460	2,898
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment gross	1,127	973
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment gross	4,728	3,173
Software
Property, Plant and Equipment [Line Items]
Property and equipment gross	2,679	521
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment gross	$ 46	$ 0