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Subsequent Events (Detail) - USD ($)
$ in Millions
1 Months Ended 2 Months Ended 12 Months Ended
Jan. 01, 2017
Jan. 31, 2017
Feb. 24, 2017
Dec. 31, 2016
Subsequent Event [Line Items]        
Contractual commitment due within the next year       $ 18.6
Contractual commitment due within two years       5.6
Contractual commitment due within three years       $ 5.6
Restricted stock units        
Subsequent Event [Line Items]        
Awards granted (in shares)       1,859,000
Software Subscription Agreement        
Subsequent Event [Line Items]        
Contractual commitment due within the next year       $ 1.3
Contractual commitment due within two years       1.4
Contractual commitment due within three years       $ 1.2
2010 Plan | Restricted stock units        
Subsequent Event [Line Items]        
Awards granted (in shares)       1,858,720
Subsequent event        
Subsequent Event [Line Items]        
Investment in equity securities   $ 0.5    
Contractual commitment due within the next year     $ 0.1  
Contractual commitment due within two years     0.2  
Contractual commitment due within three years     $ 0.1  
Subsequent event | Restricted stock units        
Subsequent Event [Line Items]        
Awards granted (in shares)     155,150  
Award vesting period     4 years  
Subsequent event | Software Subscription Agreement        
Subsequent Event [Line Items]        
Contractual commitment due within the next year     $ 1.1  
Contractual commitment due within two years     0.8  
Contractual commitment due within three years     $ 0.5  
Subsequent event | Employee Stock Purchase Plan        
Subsequent Event [Line Items]        
Share increase under plan (in shares) 565,157      
Subsequent event | 2010 Plan        
Subsequent Event [Line Items]        
Share increase under plan (in shares) 2,543,210