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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 |

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Additions made to capitalized computer software costs during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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