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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Jan. 31, 2021
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, 2021 and April 30, 2020, and indicate the fair value hierarchy of the valuation techniques we used to determine such fair value (in thousands):
 January 31, 2021
 Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance
Cash equivalents$79,759 $— $— $79,759 
Marketable securities13,369 683 — 14,052 
Total$93,128 $683 $— $93,811 
April 30, 2020
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance
Cash equivalents$75,256 $— $— $75,256 
Marketable securities11,758 3,104 — 14,862 
Total$87,014 $3,104 $— $90,118