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BALANCE SHEET COMPONENTS - Property and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Property, Plant and Equipment [Line Items]
Property and equipment gross	$ 34,708	$ 28,397
Less: Accumulated depreciation (3)	(21,792)	(15,444)
Property and equipment, net	12,916	12,953
Depreciation expense	6,800	5,700	$ 4,700
Testing equipment
Property, Plant and Equipment [Line Items]
Property and equipment gross	7,587	6,051
Computer and other equipment
Property, Plant and Equipment [Line Items]
Property and equipment gross	5,740	4,857
Tooling equipment
Property, Plant and Equipment [Line Items]
Property and equipment gross	7,828	5,801
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment gross	1,528	1,325
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment gross	6,424	5,136
Software (1) (2)
Property, Plant and Equipment [Line Items]
Property and equipment gross	5,601	2,488
Software in development (1) (2)
Property, Plant and Equipment [Line Items]
Property and equipment gross	0	2,739
Impairment charge for capitalized software development		2,500
Capitalized computer software, additions	$ 100	$ 1,300

X

- Definition

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

+ References

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Additions made to capitalized computer software costs during the period.

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