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Related Party Transactions (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 23, 2019
Jan. 10, 2019
Jan. 29, 2020
Aug. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Jul. 31, 2019
Oct. 31, 2019
Nov. 15, 2018
Related Party Transactions (Textual)                      
Debt discount             $ 54 $ 5      
Percentage of total revenue         43.00% 51.00% 43.00% 48.00%      
Class B common stock                      
Related Party Transactions (Textual)                      
Interest expense       $ 667,000              
Conversion of common stock shares       1,849,749              
Restricted shares vested             4,203        
Howard S. Jonas [Member]                      
Related Party Transactions (Textual)                      
Due to related parties $ 3,400 $ 640,000                  
Officer's [Member] | Class B common stock                      
Related Party Transactions (Textual)                      
Restricted shares vested     5,238                
Payroll Taxes     $ 116,000                
IDT Rafael Holdings, LLC [Member]                      
Related Party Transactions (Textual)                      
Warrant exercised 36,300,000 5,100,000                  
Proceeds from warrant exercises $ 34,400 $ 6,400                  
At issuance [Member]                      
Related Party Transactions (Textual)                      
Debt discount                 $ 16,000    
Beneficial conversion feature                 70,000    
Interest expense                 $ 650,000    
Howard Jonas [Member]                      
Related Party Transactions (Textual)                      
Convertible debt                     $ 15,000
Convertible conversion price per share                     $ 8.47
Interest rate on principal amount                     6.00%
IDT [Member]                      
Related Party Transactions (Textual)                      
Due to related parties         $ 142,000   $ 142,000        
Due from related parties         29,000   29,000        
Rafael Pharmaceuticals [Member]                      
Related Party Transactions (Textual)                      
Due from related parties         $ 120,000   $ 120,000     $ 120,000