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Acquired Intangible Assets, net Acquired Intangible Assets, net - Estimate of Future Amortization Expenses (Details) - USD ($)
$ in Thousands
Oct. 31, 2015
Apr. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]    
Remaining six months of Fiscal year 2016 $ 944  
Fiscal year 2017 1,890  
Fiscal year 2018 1,890  
Fiscal year 2019 1,856  
Fiscal year 2020 1,130  
Thereafter 2,842  
Total $ 10,552 $ 11,498