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Fair Value of Financial Instruments (Tables)
 3 Months Ended
Jul. 31, 2020
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 July 31, 2020 and April 30, 2020, and indicate the fair value hierarchy of the valuation techniques we used to determine such fair value (in thousands):
 July 31, 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$73,532 $— $— $73,532 
Marketable securities11,818 1,435 — 13,253 
Total$85,350 $1,435 $— $86,785 
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 equivalents75,256 — — 75,256 
Marketable securities11,758 3,104 — 14,862 
Total87,014 3,104 — 90,118