Annual report pursuant to Section 13 and 15(d)

Description of Stock Plans - Additional Information (Detail)

v3.7.0.1
Description of Stock Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Mar. 06, 2015
May 23, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Forfeited/Canceled (in shares) (2,381,302)        
Weighted average grant date fair value ($ per share) $ 0.82 $ 1.60 $ 3.44    
Total unrecognized stock base compensation expense $ 5,038 $ 9,377 $ 11,492    
Unvested stock options, weighted average period 2 years 2 months 12 days 2 years 7 months 6 days 2 years 4 months 24 days    
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) 9,665,123 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]          
Granted (in shares) 4,271,523 3,959,150 3,124,200    
Forfeited/Canceled (in shares) (2,378,523) (1,857,830)      
Restricted Stock          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of shares issued (in shares) 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        
DT Media (Appia)          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Reserved for future issuance (in shares)       245,955  
DT Media (Appia) | Employee Stock Option          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Vesting period 4 years        
Expiration period 10 years