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
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2017
Number of Shares (in shares)      
Beginning Balance (shares) 9,735,778    
Granted (shares) 326,500 345,000  
Forfeited / Cancelled (shares) (523,223)    
Exercised (shares) (12,822)    
Ending Balance (shares) 9,526,233    
Vested and expected to vest (net of estimated forfeitures) (shares) 8,387,723    
Exercisable (shares) 3,699,003    
Weighted Average Exercise Price ($ per share)      
Options outstanding ($ per share) $ 2.56    
Granted ($ per share) 1.00    
Forfeited/Cancelled ($ per share) 2.33    
Exercised ($ per share) 0.75    
Options outstanding ($ per share) 2.52    
Vested and expected to vest (net of estimated forfeitures) ($ per share) 2.72    
Exercisable ($ per share) $ 4.53    
Weighted Average Remaining Contractual Life (in years)      
Outstanding 7 years 10 months 2 days 7 years 11 months 12 days  
Vested and expected to vest (net of estimated forfeitures) 7 years 7 months 24 days    
Exercisable, June 30, 2017 6 years 4 days    
Aggregate Intrinsic Value (in $)      
Outstanding $ 1,063   $ 801
Vested and expected to vest (net of estimated forfeitures) 848    
Exercisable, June 30, 2017 $ 131