Quarterly report pursuant to Section 13 or 15(d)

Description of Stock Plans (Detail)

v3.6.0.2
Description of Stock Plans (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Weighted average grant-date fair value ($ per share)   $ 0.64 $ 2.05 $ 0.64 $ 2.05  
Total unrecognized stock base compensation expense   $ 5,706 $ 11,492 $ 5,706 $ 11,492  
Unvested stock options, weighted average period       2 years 3 months 8 days 2 years 9 months 7 days  
Allocated stock compensation expense   $ 1,118 $ 1,404 $ 3,611 $ 4,528  
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   20,000,000    
Available for issuance (in shares)   11,882,869   11,882,869   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)       1,525,500 3,336,650  
Forfeitures/cancellations (shares)       (1,853,025)    
Restricted Stock            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Awarded (in shares) 331,363     331,363    
Vesting period       1 year    
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