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Share Based Compensation
 6 Months Ended
Jul. 31, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Share Based Compensation SHARE-BASED COMPENSATION

Share-based compensation expense is recognized based on the fair value of the share-based awards expected to vest during the period.

The share-based compensation expense was as follows:
 
Three Months Ended
 
Six Months Ended
 
July 31, 2019
 
July 31, 2018
 
July 31, 2019
 
July 31, 2018
Cost of sales
$
99

 
$
103

 
$
175

 
$
183

Research and development expenses
46

 
36

 
81

 
67

Selling, general, and administrative expenses
1,621

 
1,355

 
2,292

 
2,031

Total stock-based compensation expense
$
1,766

 
$
1,494

 
$
2,548

 
$
2,281