Quarterly report pursuant to Section 13 or 15(d)

Description of Stock Plans (Detail)

v3.3.0.814
Description of Stock Plans (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 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) $ 2.53 $ 3.82 $ 2.53 $ 3.82    
Total unrecognized stock base compensation expense $ 10,668 $ 8,067 $ 10,668 $ 8,067    
Unvested stock options, weighted average period     2 years 4 months 13 days 2 years 3 months 7 days    
Allocated stock compensation expense $ 1,503 $ 1,161 $ 3,123 $ 2,055    
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) 14,047,688   14,047,688   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      
Appia Core | Employee Stock Option            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Vesting period     4 years      
Expiration period     10 years