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Business Segment and Geographic Information (Tables)
12 Months Ended
Jul. 31, 2021
Segment Reporting [Abstract]  
Schedule of net long-lived assets and total assets
   United States   Foreign   Total 
   (in thousands) 
Long-lived assets, net:            
July 31, 2021  $1,900   $641   $2,541 
July 31, 2020  $2,513   $542   $3,055 
                
Total assets:               
July 31, 2021  $32,745   $4,732   $37,477 
July 31, 2020  $7,730   $4,275   $12,005