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Business Segment and Geographic Information (Tables)
6 Months Ended
Jan. 31, 2020
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:            
31-Jan-20  $2,872   $593   $3,465 
31-Jul-19  $3,304   $212   $3,516 
                
Total assets:               
31-Jan-20  $5,743   $3,417   $9,160 
31-Jul-19  $5,508    3,499   $9,007