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
6 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Mar. 31, 2016
Number of Shares (in shares)      
Beginning Balance 7,824,395    
Granted 1,037,000 1,216,900  
Forfeited / Cancelled (860,954)    
Exercised (18,038)    
Ending Balance 7,982,403   7,824,395
Vested and expected to vest (net of estimated forfeitures) 6,413,005    
Exercisable 3,498,410    
Weighted Average Exercise Price ($ per share)      
Options outstanding $ 3.37   $ 3.61
Granted 1.13    
Forfeited/Cancelled 0.64    
Exercised 2.96    
Vested and expected to vest (net of estimated forfeitures) 3.69    
Exercisable, September 30, 2016 $ 5.04    
Weighted Average Remaining Contractual Life (in years)      
Outstanding 7 years 11 months 9 days   8 years 2 months 27 days
Vested and expected to vest (net of estimated forfeitures) 7 years 8 months 1 day    
Exercisable, September 30, 2016 6 years 6 months    
Aggregate Intrinsic Value (in $)      
Outstanding $ 65   $ 110
Vested and expected to vest (net of estimated forfeitures) 64    
Exercisable, September 30, 2016 $ 61