Short-Term Investments - Schedule of Short-Term Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Schedule Of Available For Sale Securities [Line Items]
Short-term investments, Amortized cost	$ 165,430	$ 123,395
Short-term investments, Gross unrealized gains	183	590
Short-term investments, Gross unrealized losses	(25)	(11)
Short-term investments	165,588	123,974
U.S. Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Short-term investments, Amortized cost	40,079	28,281
Short-term investments, Gross unrealized gains	30	88
Short-term investments, Gross unrealized losses		(1)
Short-term investments	40,109	28,368
Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Short-term investments, Amortized cost	108,261	70,781
Short-term investments, Gross unrealized gains	100	360
Short-term investments, Gross unrealized losses	(25)	(10)
Short-term investments	108,336	71,131
Asset-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Short-term investments, Amortized cost	15,405	24,333
Short-term investments, Gross unrealized gains	53	142
Short-term investments	15,458	$ 24,475
Certificates of Deposit
Schedule Of Available For Sale Securities [Line Items]
Short-term investments, Amortized cost	1,685
Short-term investments	$ 1,685