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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Apr. 30, 2017
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table presents our assets that we measured at fair value on a recurring basis and indicates the fair value hierarchy of the valuation techniques we utilized to determine such fair value (in thousands):

 

     April 30, 2017      April 30, 2016  
     Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)		      Significant
Other
Observable
Inputs
(Level 2)		      Significant
Unobservable
Inputs
(Level 3)		      Total      Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)		      Significant
Other
Observable
Inputs
(Level 2)		      Significant
Unobservable
Inputs
(Level 3)		      Total  

Cash equivalents

    $ 62,647      $ —      $ —      $ 62,647      $ 45,977      $ —      $ —      $ 45,977  

Marketable securities

      8,984        14,803        —        23,787        7,374        21,487        —        28,861  
  

 

 

     

 

 

     

 

 

     

 

 

     

 

 

     

 

 

     

 

 

     

 

 

  

Total

    $ 71,631      $ 14,803      $ —      $ 86,434      $ 53,351      $ 21,487      $ —      $ 74,838