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
 3 Months Ended 12 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Mar. 31, 2013
2011 Equity Incentive Plan
      
Number of Shares      
Beginning Balance 2,748,140 60,000  
Granted   2,840,000  
Forfeited/Canceled   (151,860)  
Exercised (79,470)    
Ending Balance 2,668,670 2,748,140 60,000
Vested and expected to vest 1,956,688    
Exercisable 397,306    
Weighted Average Exercise Price      
Beginning Balance $ 3.32 $ 4.65  
Granted   $ 3.33  
Forfeited/Canceled   $ 3.96  
Exercised $ 3.92    
Ending Balance $ 3.31 $ 3.32 $ 4.65
Vested and expected to vest at June 30, 2014 $ 3.39    
Exercisable, June 30, 2014 $ 3.93    
Weighted Average Remaining Contractual Life      
Outstanding 9 years 2 months 16 days 9 years 5 months 16 days 9 years 11 months 27 days
Vested and expected to vest at June 30, 2014 9 years 2 months 9 days    
Exercisable, June 30, 2014 9 years 4 days    
Aggregate Intrinsic Value      
Beginning Balance $ 2,080    
Ending Balance 2,056 2,080  
Vested and expected to vest at June 30, 2014 1,384    
Exercisable, June 30, 2014 $ 110