Annual report pursuant to Section 13 and 15(d)

Description of Stock Plans - Summary of Options Granted under all Equity Plans (Detail)

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Description of Stock Plans - Summary of Options Granted under all Equity Plans (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Number of Shares      
Assumed through acquisitions   246,000  
Weighted Average Exercise Price (per share)      
Assumed through acquisitions   $ 0.64  
Stock Option      
Number of Shares      
Beginning Balance 5,789,758 3,467,810  
Assumed through acquisitions   245,955  
Granted 3,959,150 3,124,200  
Forfeited/Canceled (1,857,830) (994,874)  
Exercised (66,683) (53,333)  
Ending Balance 7,824,395 5,789,758 3,467,810
Vested and expected to vest 6,116,010    
Exercisable, March 31, 2016 2,943,295    
Weighted Average Exercise Price (per share)      
Beginning Balance $ 4.65 $ 5.05  
Assumed through acquisitions     $ 0.64
Granted 2.05 4.06  
Forfeited/Canceled 3.37 3.24  
Exercised 0.77 2.56  
Ending Balance 3.61 $ 4.65 $ 5.05
Vested and expected to vest (net of estimated forfeitures) 3.92    
Exercisable, March 31, 2016 $ 5.42    
Weighted Average Remaining Contractual Life (in years)      
Outstanding 8 years 2 months 27 days 8 years 4 months 6 days 8 years 3 months 29 days
Vested and expected to vest (net of estimated forfeitures) 7 years 11 months 16 days    
Exercisable, March 31, 2016 6 years 6 months 26 days    
Aggregate Intrinsic Value (in thousands)      
Beginning Balance $ 1,319 $ 2,318  
Ending Balance 110 $ 1,319 $ 2,318
Vested and expected to vest (net of estimated forfeitures) 103    
Exercisable, March 31, 2016 $ 90