Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Deferred tax assets:
Accruals and reserves	$ 3,933	$ 1,631
Deferred revenue	904	84
Property and equipment	128
Stock-based compensation	2,542	700
Net operating loss carryforwards	68,694	26,690
Research and development credits	12,226	5,649
Total deferred tax assets before valuation allowance	88,427	34,754
Valuation allowance	(85,569)	(33,253)
Deferred tax assets	2,858	1,501
Deferred tax liabilities:
Deferred contract costs	(2,182)	(1,229)
Property and equipment		(143)
Other	(676)	(129)
Total deferred tax liabilities	(2,858)	(1,501)
Net deferred tax assets (liabilities)	$ 0	$ 0