Balance Sheet Components - Intangible assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020
Schedule of Finite-lived Intangible Assets and Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	$ 19,455	$ 19,455
Less: accumulated amortization	(3,794)	(2,954)
Finite-Lived Intangible Assets, Net	15,661	16,501
Goodwill	269	269
Intangible assets, net	15,930	16,770
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