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Description of Stock Plans (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2015
May. 23, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Weighted average grant-date fair value ($ per share) $ 3.43      
Total unrecognized stock base compensation expense $ 10,781 $ 5,915    
Unvested stock options, weighted average period 2 years 5 months 23 days 2 years 4 months 17 days    
Allocated stock compensation expense $ 1,621 $ 894    
Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Option plan, term 10 years      
Stock Option Plan 2011        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Reserved for future issuance (in shares)       20,000,000
Available for issuance (in shares) 14,625,275   14,393,741  
Stock Incentive Plans | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Option plan, term 3 years      
Stock Incentive Plans | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Option plan, term 4 years      
Restricted Stock        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting period 3 years      
Restricted Stock | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting period 3 months      
Restricted Stock | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting period 2 years      
Appia Core | Employee Stock Option        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting period 4 years      
Expiration period 10 years