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Acquired Intangible Assets, net - Estimate of Future Amortization Expenses (Details) - USD ($)
$ in Thousands
Apr. 30, 2017
Apr. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 1,890  
2019 1,856  
2020 1,130  
2021 1,130  
2022 1,130  
Thereafter 581  
Total $ 7,717 $ 9,607