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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Apr. 30, 2019
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured at Fair Value on Recurring Basis
The following table presents our assets that we measured at fair value on a recurring basis and indicates the fair value hierarchy of the valuation techniques we utilized to determine such fair value (in thousands): 
 
April 30, 2019
 
April 30, 2018
 
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Total
 
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Total
Cash equivalents
$
56,645

 
$
—

 
$
—

 
$
56,645

 
$
46,972

 
$
—

 
$
—

 
$
46,972

Marketable securities
11,002

 
16,192

 
—

 
27,194

 
11,125

 
23,889

 
—

 
35,014

Total
$
67,647

 
$
16,192

 
$
—

 
$
83,839

 
$
58,097

 
$
23,889

 
$
—

 
$
81,986