Quarterly report pursuant to Section 13 or 15(d)

Summary of Options Granted under 2011 Plan (Detail)

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Summary of Options Granted under 2011 Plan (Detail) (2011 Equity Incentive Plan, USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 12 Months Ended
Sep. 30, 2014
Mar. 31, 2014
Mar. 31, 2013
2011 Equity Incentive Plan
      
Number of Shares      
Beginning Balance 2,748,140 60,000  
Granted 1,119,200 2,840,000  
Forfeited/Canceled (478,587) (151,860)  
Exercised 0 0  
Ending Balance 3,388,753 2,748,140 60,000
Vested and expected to vest 2,436,599    
Exercisable 489,448    
Weighted Average Exercise Price      
Beginning Balance $ 3.32 $ 4.65  
Granted $ 4.13 $ 3.33  
Forfeited/Canceled $ 3.10 $ 3.96  
Exercised $ 0 $ 0  
Ending Balance $ 3.62 $ 3.32 $ 4.65
Vested and expected to vest at September 30, 2014 $ 3.65    
Exercisable, September 30, 2014 $ 3.80    
Weighted Average Remaining Contractual Life      
Outstanding 9 years 2 months 19 days 9 years 5 months 16 days 9 years 11 months 27 days
Vested and expected to vest at September 30, 2014 9 years 2 months 5 days    
Exercisable, September 30, 2014 8 years 9 months 29 days    
Aggregate Intrinsic Value      
Beginning Balance $ 2,080    
Ending Balance 3,309 2,080  
Vested and expected to vest at September 30, 2014 2,310    
Exercisable, September 30, 2014 $ 385