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Share Based Compensation
 9 Months Ended
Oct. 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 EndedNine Months Ended
October 31, 2019October 31, 2018October 31, 2019October 31, 2018
Cost of sales$98  $99  $273  $282  
Research and development expenses41  32  122  99  
Selling, general, and administrative expenses852  696  3,144  2,727  
Total stock-based compensation expense$991  $827  $3,539  $3,108