Balance Sheet Details - Accrued and Other Current Liabilities (Details) - USD ($) $ in Thousands		Jul. 31, 2021	Apr. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Liability for common stock exercised prior to vesting		$ 4,177	$ 5,331
Accrued general expenses		4,141	3,588
Operating lease liabilities, current		3,996	3,894
Other		4,794	5,505
Accrued and other current liabilities	[1]	$ 17,108	$ 18,318

[1] Including amounts from a related party of $2,551 and $3,413 as of July 31, 2021 and April 30, 2021, respectively.