Balance Sheet Components - Accrued liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Balance Sheet Related Disclosures [Abstract]
Accrued compensation and benefits	$ 19,968	$ 16,385
Warranty accrual	709	623	$ 535	$ 1,866
Stock rotation accrual	3,358	1,921	$ 1,750	$ 1,871
Accrued professional fees	5,868	1,721
Accrued inventory	775	857
Accrued facilities related expenses	1,831	4,233
Accrued financing lease costs	0	728
Accrued property, plant and equipment	11,039	11,527
Other accrued expenses	8,017	5,144
Customer deposit	2,813	351
ESPP payable	608	585
Accrued liabilities	$ 54,986	$ 44,075