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Share Based Compensation
 6 Months Ended
Jul. 31, 2018
Share-based Compensation [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, 2018
 
July 31, 2017
 
July 31, 2018
 
July 31, 2017
Cost of sales
$
103

 
$
55

 
$
183

 
$
113

Research and development expenses
36

 
31

 
67

 
68

Selling, general, and administrative expenses
1,355

 
1,055

 
2,031

 
1,751

Total stock-based compensation expense
$
1,494

 
$
1,141

 
$
2,281

 
$
1,932