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Stockholders' Equity - Summary of Employee and Non-Employee Stock Options Activity (Detail) - USD ($)
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Options / Shares, Outstanding 380,940    
Options / Shares, Cancelled/Forfeited (14,391)    
Options / Shares, Outstanding 366,549    
Options / Shares, Exercisable at March 31, 2016 261,656    
Options / Shares, Fully vested and expected to vest at March 31, 2016 357,776    
Weighted-Average Exercise Price, Outstanding $ 84.57    
Weighted-Average Exercise Price, Cancelled/Forfeited 115.35    
Weighted-Average Exercise Price, Outstanding 83.39    
Weighted-Average Exercise Price, Exercisable at March 31, 2016 110.06    
Weighted-Average Exercise Price, Fully vested and expected to vest at March 31, 2016 $ 85.07    
Weighted-Average Remaining Contractual Term, Outstanding at March 31, 2016 5 years 8 months 12 days    
Weighted-Average Remaining Contractual Term, Exercisable at March 31, 2016 4 years 9 months 18 days    
Weighted-Average Remaining Contractual Term, Fully vested and expected to vest at March 31, 2016 5 years 7 months 6 days    
Aggregate Intrinsic Value, Exercisable at March 31, 2016 $ 0 $ 0 $ 0