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Goodwill and Acquired Intangible Assets, Net - Future Amortization Expense (Details) - USD ($)
$ in Thousands
Jan. 31, 2020
Jul. 31, 2019
Jan. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]      
2021 $ 8,504    
2022 8,500    
2023 8,500    
2024 7,825    
2025 1,450    
Net Book Value $ 34,779 $ 34,779 $ 15,894