Quarterly report pursuant to Section 13 or 15(d)

Description of Stock Plans - Summary of Options Granted Under All Equity Plans (Detail)

v3.3.0.814
Description of Stock Plans - Summary of Options Granted Under All Equity Plans (Detail) - Stock Option - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2015
Mar. 31, 2015
Number of Shares (in shares)        
Beginning Balance 5,533,225 5,789,758 5,789,758  
Granted 790,500 426,400    
Forfeited/Canceled (270,209) (679,267)    
Exercised (59,541) (3,666)    
Ending Balance 5,993,975 5,533,225 5,993,975 5,789,758
Vested and expected to vest (net of estimated forfeitures) 4,743,847   4,743,847  
Exercisable 2,348,204   2,348,204  
Weighted Average Exercise Price ($ per share)        
Beginning Balance $ 4.74 $ 4.65 $ 4.65  
Granted      
Forfeited/Canceled      
Exercised      
Ending Balance 4.53 $ 4.74 4.53 $ 4.65
Vested and expected to vest (net of estimated forfeitures) 4.77   4.77  
Exercisable, September 30, 2015 $ 5.90   $ 5.90  
Weighted Average Remaining Contractual Life (in years)        
Outstanding 8 years 1 month 24 days 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 10 days  
Exercisable, September 30, 2015     6 years 5 months 16 days  
Aggregate Intrinsic Value (in $)        
Outstanding $ 217 $ 899 $ 217 $ 1,319
Vested and expected to vest (net of estimated forfeitures) 217   217  
Exercisable, September 30, 2015 $ 223   $ 223