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Stockholders' Equity - Summary of Employee and Non-Employee Stock Options Activity (Detail) (USD $)
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Options/Shares, Outstanding at March 31, 2014 294,184us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber    
Options/Shares, Granted 100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross    
Options/Shares, Cancelled/Forfeited (13,244)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod    
Options/Shares, Outstanding at March 31, 2015 380,940us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber    
Options/Shares, Exercisable at March 31, 2015 210,869us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber    
Options/Shares, Fully vested and expected to vest at March 31, 2015 363,021us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber    
Weighted-Average Exercise Price, Outstanding at March 31, 2014 $ 109.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice    
Weighted-Average Exercise Price, Granted $ 14.30us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice    
Weighted-Average Exercise Price, Cancelled/Forfeited $ 103.51us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice    
Weighted-Average Exercise Price, Outstanding at March 31, 2015 $ 84.57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice    
Weighted-Average Exercise Price, Exercisable at March 31, 2015 $ 135.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice    
Weighted-Average Exercise Price, Fully vested and expected to vest at March 31, 2015 $ 87.94us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice    
Weighted-Average Remaining Contractual Term, Outstanding at March 31, 2015 6 years 7 months 6 days    
Weighted-Average Remaining Contractual Term, Exercisable at March 31, 2015 5 years    
Weighted-Average Remaining Contractual Term, Fully vested and expected to vest at March 31, 2015 6 years 6 months    
Aggregate Intrinsic Value, Outstanding at March 31, 2015 $ 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 $ 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 $ 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1