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Stockholders' Equity - Summary of Stock Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Stock Options, Outstanding, April 30, 2014   1,368,000  
Stock Options, Granted 0 200,000 0
Stock Options, Exercised   (33,000)  
Stock Options, Forfeited   (145,000)  
Stock Options, Outstanding, October 31, 2014   1,390,000  
Stock Options, Exercisable, October 31, 2014   849,000  
Stock Options, Expected to vest, October 31, 2014   1,389,000  
Weighted Average Exercise Price, Outstanding, April 30, 2014   $ 8.65  
Weighted Average Exercise Price, Granted   $ 4.86  
Weighted Average Exercise Price, Exercised   $ 4.30  
Weighted Average Exercise Price, Forfeited   $ 13.06  
Weighted Average Exercise Price, Outstanding, October 31, 2014   $ 7.75  
Weighted Average Exercise Price, Exercisable, October 31,2014   $ 9.73  
Weighted Average Exercise Price, Expected to vest, October 31, 2014   $ 7.76  
Weighted Average Remaining Contractual Term, Outstanding   5 years 4 months 24 days  
Weighted Average Remaining Contractual Term, Exercisable   3 years 2 months 12 days  
Weighted Average Remaining Contractual Term, Expected to vest   5 years 4 months 24 days  
Aggregate Intrinsic Value, Outstanding, October 31, 2014   $ 248  
Aggregate Intrinsic Value, Exercisable, October 31, 2014   139  
Aggregate Intrinsic Value, Expected to vest, October 31, 2014   $ 248