v3.5.0.2
Organization and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
May 02, 2016
Sep. 30, 2016
Sep. 30, 2015
Mar. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Organization And Summary Of Significant Accounting Policies [Line Items]              
Share-based compensation   $ 29.0 $ 22.6   $ 81.7 $ 59.2  
Accumulated deficit   613.6     613.6   $ 555.4
Cash, cash equivalents and short-term investments   127.3     127.3    
Working capital   172.5     172.5    
Unrecognized compensation cost   $ 184.5     $ 184.5    
Sales Return Coverage Period         30 days    
Issuance of common stock in connection with acquisition         $ 7.2 0.0  
Acquisition-related holdback liability         $ 1.8 $ 0.0  
Computer Equipment [Member]              
Organization And Summary Of Significant Accounting Policies [Line Items]              
Property, Plant and Equipment, Useful Life         3 years    
Machinery and Equipment [Member]              
Organization And Summary Of Significant Accounting Policies [Line Items]              
Property, Plant and Equipment, Useful Life         4 years    
Furniture and Fixtures [Member]              
Organization And Summary Of Significant Accounting Policies [Line Items]              
Property, Plant and Equipment, Useful Life         5 years    
G4 PLATINUM with Share [Member]              
Organization And Summary Of Significant Accounting Policies [Line Items]              
Inventory Write-down       $ 2.0      
Customer Notification- Receiver Speaker [Member]              
Organization And Summary Of Significant Accounting Policies [Line Items]              
Inventory Write-down         $ 3.5    
Nintamed [Member]              
Organization And Summary Of Significant Accounting Policies [Line Items]              
Stock Issued During Period, Shares, New Issues 110,993            
Issuance of common stock in connection with acquisition $ 7.2            
Acquisition-related holdback liability $ 1.8