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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Jan. 31, 2022
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured at Fair Value on Recurring Basis
The following tables present our assets and liabilities that we measured at fair value on a recurring basis as of January 31, 2022 and April 30, 2021, and indicate the fair value hierarchy of the valuation techniques we used to determine such fair value (in thousands):
 January 31, 2022
 Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance
Cash equivalents$89,285 $— $— $89,285 
Marketable securities16,463 — — 16,463 
Total$105,748 $— $— $105,748 
April 30, 2021
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance
Cash equivalents81,720 — — 81,720 
Marketable securities15,332 674 — 16,006 
Total97,052 674 — 97,726