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Balance Sheet Components - Intangible assets (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Jun. 30, 2017
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Schedule of Finite-lived Intangible Assets and Goodwill [Line Items] |  |
Finite-Lived Intangible Assets, Gross | $ 19,051 | $ 2,666
Less: accumulated amortization | (2,701) | (2,653)
Intangible Assets, Net (Excluding Goodwill) | 16,350 | 13
Goodwill | 269 | 269
Intangible assets, net | 16,619 | 282
License fees |  |
Schedule of Finite-lived Intangible Assets and Goodwill [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 17,633 | 1,248
Trade name |  |
Schedule of Finite-lived Intangible Assets and Goodwill [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 268 | 268
Customer relationships |  |
Schedule of Finite-lived Intangible Assets and Goodwill [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 1,150 | $ 1,150
STMicro | License fees |  |
Schedule of Finite-lived Intangible Assets and Goodwill [Line Items] |  |
Finite-Lived Intangible Assets, Net | $ 16,400 |

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