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Summary of Restricted Stock Award (Detail) (USD $)
 6 Months Ended 12 Months Ended
Sep. 30, 2014
Mar. 31, 2014
Schedule Of Share Based Compensation Restricted Stock Units Award Activity [Line Items]    
Shares,Balance, Beginning 3,752,000  
Shares,Granted 112,000  
Shares,Released (183,996)  
Shares,Balance, Ending 3,680,004 3,752,000
Vested and exercisable 2,461,694  
Balance, Weighted Average Remaining Vesting Life (Years) 7 months 6 days 9 months 18 days
Balance, Weighted Average Remaining Vesting Life, Granted 0 years  
Balance, Weighted Average Remaining Vesting Life, Released 0 years  
Weighted Average Per Share Intrinsic Value, Balance, Beginning $ 0.02  
Weighted Average Per Share Intrinsic Value, Granted 0  
Weighted Average Per Share Intrinsic Value, Released 0  
Weighted Average Per Share Intrinsic Value, Balance, Ending $ 0.73 $ 0.02
Weighted Average Per Share Fair Value, Balance, Beginning $ 0.03  
Weighted Average Per Share Fair Value, Granted $ 0.78  
Weighted Average Per Share Fair Value, Released $ 0  
Weighted Average Per Share Fair Value, Balance, Ending $ 0.05 $ 0.03