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, 2016
Mar. 31, 2016
Number of Shares (in shares)    
Beginning Balance 7,824,395  
Granted 345,000  
Forfeited / Cancelled (252,200)  
Exercised (4,212)  
Ending Balance 7,912,983 7,824,395
Vested and expected to vest (net of estimated forfeitures) 6,296,796  
Exercisable 3,295,307  
Weighted Average Exercise Price ($ per share)    
Options outstanding $ 3.53 $ 3.61
Granted 1.05  
Forfeited/Cancelled 2.79  
Exercised 0.63  
Vested and expected to vest (net of estimated forfeitures) 3.84  
Exercisable, June 30, 2016 $ 5.21  
Weighted Average Remaining Contractual Life (in years)    
Outstanding 8 years 18 days 8 years 2 months 27 days
Vested and expected to vest (net of estimated forfeitures) 7 years 9 months 11 days  
Exercisable, June 30, 2016 6 years 6 months 15 days  
Aggregate Intrinsic Value (in $)    
Outstanding $ 79 $ 110
Vested and expected to vest (net of estimated forfeitures) 75  
Exercisable, June 30, 2016 $ 68