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Balance Sheet Components - Intangible assets (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Sep. 05, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Payments to Acquire Intangible Assets |  | $ 405,000 | $ 16,384,000 | $ 0
Intangible assets, gross |  | 19,455,000 | 19,051,000 |
Less accumulated amortization |  | (2,842,000) | (2,729,000) |
Intangible Assets, Net (Excluding Goodwill) |  | 16,613,000 | 16,322,000 |
Goodwill |  | 269,000 | 269,000 | 300,000
Intangible assets, net |  | 16,882,000 | 16,591,000 |
Amortization expense |  | 113,000 | 76,000 | $ 0
Patents and exclusive technology rights [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, gross |  | 18,037,000 | 17,633,000 |
Trade name [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, gross |  | 268,000 | 268,000 |
Customer relationships [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, gross |  | 1,150,000 | $ 1,150,000 |
STMicro [Member] | Licensing Agreements [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Payments to Acquire Intangible Assets | $ 17,000,000 | $ 16,200,000 |  |
Payments to Acquire Intangible Assets in Calender year 2017 | 10,100,000 |  |  |
Payments to Acquire Intangible Assets in Calender Year 2018 | 6,700,000 |  |  |
Payments to Acquire Intangible Assets in Calendar Year 2019 | $ 200,000 |  |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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