Short-Term Investments - Schedule of Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Jun. 30, 2020
Schedule Of Available For Sale Securities [Line Items]
Fair value	$ 276,326	$ 12,056
Unrealized losses	(157)	(11)
Asset-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Fair value	15,381
Unrealized losses	(6)
Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Fair value	259,691	9,258
Unrealized losses	(150)	(10)
Certificates of Deposit
Schedule Of Available For Sale Securities [Line Items]
Fair value	1,254
Unrealized losses	$ (1)
U.S. Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Fair value		2,798
Unrealized losses		$ (1)