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Stock-Based Compensation (Tables)
 9 Months Ended
Jan. 31, 2019
Share-based Compensation [Abstract]  
Stock-Based Compensation Expense Allocated
For the three- and nine-month periods ended January 31, 2019 and 2018, stock-based compensation expense was allocated as follows: 
 
 
Three Months Ended 
 January 31,

Nine Months Ended 
 January 31,
(in thousands)
 
2019

2018

2019

2018
Cost of sales and distribution
 
$
158

 
$
256

 
$
502

 
$
777

Selling and marketing expenses
 
64

 
183

 
449

 
385

General and administrative expenses
 
446

 
458

 
1,339

 
1,344

Stock-based compensation expense
 
$
668

 
$
897

 
$
2,290

 
$
2,506