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Acquired Intangible Assets, net Acquired Intangible Assets, net - Estimate of Future Amortization Expenses (Details) - USD ($)
$ in Thousands
Jan. 31, 2017
Apr. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
Remaining nine months of Fiscal year 2017 $ 473  
Fiscal year 2018 1,890  
Fiscal year 2019 1,856  
Fiscal year 2020 1,130  
Fiscal year 2021 1,130  
Thereafter 1,711  
Total $ 8,190 $ 9,607