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BALANCE SHEET COMPONENTS - Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	$ 44,823	$ 42,464
Less: Accumulated depreciation	(31,580)	(28,136)
Property and Equipment, Net	13,243	14,328
Testing equipment
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	9,318	8,577
Computer and other equipment
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	6,631	6,265
Tooling equipment
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	10,148	9,594
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	1,920	1,890
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	10,619	10,106
Software
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	$ 6,187	$ 6,032

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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