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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Jan. 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 January 31, 2019 and April 30, 2018, respectively, and indicates the fair value hierarchy of the valuation techniques we used to determine such fair value (in thousands):
 
January 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
$
49,190

 
$
—

 
$
—

 
$
49,190

Marketable securities
9,810

 
19,294

 
—

 
29,104

Total
$
59,000

 
$
19,294

 
$
—

 
$
78,294

 
April 30, 2018
 
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Balance
Cash equivalents
$
46,972

 
$
—

 
$
—

 
$
46,972

Marketable securities
11,125

 
23,889

 
—

 
35,014

Total
$
58,097

 
$
23,889

 
$
—

 
$
81,986