Quarterly report pursuant to Section 13 or 15(d)

Description of Stock Plans (Detail)

v3.7.0.1
Description of Stock Plans (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted average grant-date fair value ($ per share) $ 1.00 $ 1.05  
Total unrecognized stock base compensation expense $ 3,491 $ 8,103  
Unvested stock options, weighted average period 2 years 25 days 2 years 5 months 15 days  
Allocated stock compensation expense $ 864 $ 1,303  
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) 9,861,846   9,665,123
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) 326,500 345,000  
Forfeitures/cancellations (shares) (523,223)    
Restricted Stock      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Awarded (in shares) 0    
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