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Stock-Based Compensation (Tables)
 9 Months Ended
Jan. 31, 2020
Share-based Compensation [Abstract]  
Stock-Based Compensation Expense Allocated
For the three- and nine-month periods ended January 31, 2020 and 2019, stock-based compensation expense was allocated as follows: 
 
 
Three Months Ended 
 January 31,

Nine Months Ended 
 January 31,
(in thousands)
 
2020

2019

2020

2019
Cost of sales and distribution
 
$
224

 
$
158

 
$
716

 
$
502

Selling and marketing expenses
 
240

 
64

 
713

 
449

General and administrative expenses
 
583

 
446

 
1,693

 
1,339

Stock-based compensation expense
 
$
1,047

 
$
668

 
$
3,122

 
$
2,290