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Fair Value of Financial Instruments (Tables)
 3 Months Ended
Jul. 31, 2019
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, 2019 and April 30, 2019, and indicate the fair value hierarchy of the valuation techniques we used to determine such fair value (in thousands):
 
July 31, 2019
 
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Balance
Cash equivalents
$
59,776

 
$
—

 
$
—

 
$
59,776

Marketable securities
10,902

 
14,368

 
—

 
25,270

Total
$
70,678

 
$
14,368

 
$
—

 
$
85,046

 
April 30, 2019
 
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Balance
Cash equivalents
$
56,645

 
$
—

 
$
—

 
$
56,645

Marketable securities
11,002

 
16,192

 
—

 
27,194

Total
$
67,647

 
$
16,192

 
$
—

 
$
83,839