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Business Segment and Geographic Information (Tables)
9 Months Ended
Apr. 30, 2021
Segment Reporting [Abstract]  
Schedule of net long-lived assets and total assets held outside of the United States
   United States   Foreign   Total 
   (in thousands) 
Long-lived assets, net:            
April 30, 2021  $2,082   $594   $2,676 
July 31, 2020  $2,513   $542   $3,055 
                
Total assets:               
April 30, 2021  $27,108   $5,936   $33,044 
July 31, 2020  $7,730   $4,275   $12,005