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Balance Sheet Components - Intangible assets (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018
Schedule of Finite-lived Intangible Assets and Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	$ 19,055	$ 19,051
Less: accumulated amortization	(2,757)	(2,729)
Intangible Assets, Net (Excluding Goodwill)	16,298	16,322
Goodwill	269	269
Intangible assets, net	16,567	16,591
Patents and technology rights
Schedule of Finite-lived Intangible Assets and Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	17,637	17,633
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

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[Line Items] for Schedule of Finite-lived Intangible Assets and Goodwill [Table]

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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