Annual report pursuant to Section 13 and 15(d)

Description of Stock Plans - Additional Information (Detail)

v3.5.0.1
Description of Stock Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 06, 2015
Mar. 31, 2014
May 23, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Weighted average grant date fair value ($ per share) $ 1.60 $ 3.44   $ 3.33  
Total unrecognized stock base compensation expense $ 9,377 $ 11,492      
Unvested stock options, weighted average period 2 years 6 months 29 days 2 years 4 months 13 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) 11,886,707 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        
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