Balance Sheet Components - Accrued liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018
Balance Sheet Related Disclosures [Abstract]
Accrued compensation and benefits	$ 16,772	$ 16,385
Warranty accrual	672	623	$ 655	$ 535
Stock rotation accrual	3,307	1,921	$ 1,723	$ 1,750
Accrued professional fees	5,261	1,721
Accrued inventory	487	857
Accrued facilities related expenses	1,995	4,233
Accrued financing lease costs	705	728
Accrued property, plant and equipment	9,745	11,527
ESPP payable	1,913	585
Customer deposit	2,556	351
Other accrued expenses	7,159	5,144
Accrued liabilities	$ 50,572	$ 44,075