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Share Based Compensation
 6 Months Ended
Jul. 31, 2021
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 EndedSix Months Ended
July 31, 2021July 31, 2020July 31, 2021July 31, 2020
Cost of sales$86 $38 $162 $118 
Research and development expenses353 383 626 757 
Selling, general, and administrative expenses2,205 1,692 3,590 2,734 
Total share-based compensation expense$2,644 $2,113 $4,378 $3,609