Quarterly report pursuant to Section 13 or 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) - Stock Option - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Number of Shares (in shares)    
Beginning Balance 5,789,758  
Granted 426,400  
Forfeited/Canceled (679,267)  
Exercised (3,666)  
Ending Balance 5,533,225 5,789,758
Vested and expected to vest (net of estimated forfeitures) 4,363,422  
Exercisable 2,037,196  
Weighted Average Exercise Price ($ per share)    
Beginning Balance $ 4.65  
Granted    
Forfeited/Canceled    
Exercised    
Ending Balance $ 4.74 $ 4.65
Vested and expected to vest (net of estimated forfeitures) 4.96  
Exercisable, June 30, 2015 $ 6.23  
Weighted Average Remaining Contractual Life (in years)    
Outstanding 8 years 2 months 5 days 8 years 4 months 6 days
Vested and expected to vest (net of estimated forfeitures) 7 years 10 months 13 days  
Exercisable, June 30, 2015 6 years 3 months 15 days  
Aggregate Intrinsic Value (in $)    
Outstanding $ 899 $ 1,319
Vested and expected to vest (net of estimated forfeitures) 865  
Exercisable, June 30, 2015 $ 638