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Balance Sheet Components - Intangible assets (Details) - USD ($) | 12 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, gross | $ 19,455,000 | $ 19,455,000 |
Less accumulated amortization | (2,954,000) | (2,842,000) |
Intangible Assets, Net (Excluding Goodwill) | 16,501,000 | 16,613,000 |
Goodwill | 269,000 | 269,000 |
Intangible assets, net | 16,770,000 | 16,882,000 |
Amortization expense | 113,000 | 113,000 | $ 76,000
Patents and exclusive technology rights [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, gross | 18,037,000 | 18,037,000 |
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] |  |  |
Intangible assets, gross | $ 16,200,000 |  |

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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=121586364&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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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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