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Revenue (Tables)
 3 Months Ended
Oct. 31, 2020
Disclosure Text Block [Abstract]  
Schedule of revenue by type of service
   Three Months Ended 
   October 31, 
   2020   2019 
         
   (in thousands) 
Advertising revenue  $2,986   $1,667 
Paid subscription revenue   650    207 
Other revenues   126    159 
Total Revenues  $3,762   $2,033