Quarterly report pursuant to Section 13 or 15(d)

Description of Stock Plans (Detail)

v3.5.0.2
Description of Stock Plans (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted average grant-date fair value ($ per share) $ 0.81 $ 3.43  
Total unrecognized stock base compensation expense $ 8,103 $ 10,781  
Unvested stock options, weighted average period 2 years 5 months 16 days 2 years 5 months 23 days  
Allocated stock compensation expense $ 1,303 $ 1,621  
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) 11,818,907   11,886,707
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    
Equity Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Grants (shares) 345,000    
Forfeitures/cancellations (shares) 252,200    
Appia Core | Employee Stock Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Vesting period 4 years    
Expiration period 10 years