Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Income Taxes [Line Items]
Change in valuation allowance	$ 52,300	$ 3,700	$ 10,000
Federal and state net operating loss carryforwards expiration year	2026
Research and development tax credit carryforwards expiration description	federal tax credits will expire at various dates beginning in 2027.
Unrecognized tax benefits related to federal and California R&D credits	$ 5,787	$ 2,692	1,457	$ 835
Federal Tax
Income Taxes [Line Items]
Net operating loss carryforwards	265,800
Research and development tax credit carryforwards	10,600
Federal Tax | Internal Revenue Service
Income Taxes [Line Items]
Net operating loss carryforwards	166,000
State Tax
Income Taxes [Line Items]
Net operating loss carryforwards	203,500
Research and development tax credit carryforwards	$ 8,700
ASC 606
Income Taxes [Line Items]
Change in valuation allowance			$ (700)