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Revenue (Tables)
 12 Months Ended
Jul. 31, 2021
Revenue [Abstract]  
Schedule of revenue by type of service
   Fiscal Year Ended 
   July 31, 
   2021   2020 
   (in thousands) 
Advertising revenue  $15,741   $7,410 
Paid subscription revenue   3,311    1,599 
Other revenues   517    461 
Total Revenues  $19,569   $9,470