Balance Sheet Components - Intangible assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jun. 30, 2019
Schedule of Finite-lived Intangible Assets and Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	$ 19,455	$ 19,455
Less: accumulated amortization	(2,926)	(2,842)
Finite-Lived Intangible Assets, Net	16,529	16,613
Goodwill	269	269
Intangible assets, net	16,798	16,882
Patents and technology rights
Schedule of Finite-lived Intangible Assets and Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	18,037	18,037
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