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Goodwill and Acquired Intangible Assets - Schedule of Acquired Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Jul. 31, 2019
Finite-lived Intangible Assets [Roll Forward]          
Intangible Assets, Gross, beginning balance     $ 9,616    
Additions     0    
Intangible Assets, Gross, ending balance $ 9,616   9,616    
Accumulated Amortization, beginning balance     (908)    
Amortization Expense (600) $ (100) (1,421) $ (239)  
Accumulated Amortization, ending balance (2,329)   (2,329)    
Finite-Lived Intangible Assets, Net, Total 7,287   7,287   $ 8,708
Developed technology          
Finite-lived Intangible Assets [Roll Forward]          
Intangible Assets, Gross, beginning balance     9,456    
Additions     0    
Intangible Assets, Gross, ending balance 9,456   9,456    
Accumulated Amortization, beginning balance     (897)    
Amortization Expense     (1,405)    
Accumulated Amortization, ending balance (2,302)   (2,302)    
Finite-Lived Intangible Assets, Net, Total 7,154   7,154   8,559
Customer relationships          
Finite-lived Intangible Assets [Roll Forward]          
Intangible Assets, Gross, beginning balance     160    
Additions     0    
Intangible Assets, Gross, ending balance 160   160    
Accumulated Amortization, beginning balance     (11)    
Amortization Expense     (16)    
Accumulated Amortization, ending balance (27)   (27)    
Finite-Lived Intangible Assets, Net, Total $ 133   $ 133   $ 149