Balance Sheet Components - Intangible assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 19,455	$ 19,455
Less accumulated amortization	(19,455)	(16,208)
Intangible assets, net (excluding goodwill)	0	3,247
Goodwill	269	269
Intangible assets, net	269	3,516
Amortization expense	3,200	3,200	$ 3,300
Patents and exclusive technology rights
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 18,037	18,037
Finite-lived intangible asset, useful life	5 years
Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 268	268
Finite-lived intangible asset, useful life	10 years
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 1,150	$ 1,150