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Stockholders' Equity - Summary of Stock Option Activity (Detail) - USD ($)
 3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Options Outstanding, Beginning balance 7,113,548  
Granted, Options Outstanding 1,762,641  
Canceled, Options Outstanding (24,003)  
Exercised, Options Outstanding (25,503) (60,522)
Options Outstanding, Ending balance 8,826,683  
Vested and Exercisable, Options Outstanding 3,684,516  
Weighted-Average Exercise Price, Options Beginning balance $ 5.21  
Options granted, Weighted-Average Exercise Price 4.92  
Options canceled, Weighted-Average Exercise Price 5.75  
Options exercised, Weighted-Average Exercise Price 3.01  
Weighted-Average Exercise Price, Options Ending balance 5.16  
Vested and Exercisable, Weighted-Average Exercise Price $ 3.99  
Aggregate Intrinsic Value, Options Beginning balance $ 4,969,499  
Options Exercised, Aggregate Intrinsic Value 61,484  
Aggregate Intrinsic Value, Options Ending balance 5,493,770  
Vested and Exercisable at December 30, 2014 $ 4,641,630