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Equity Award Plans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares reserved for future issuance (shares) 64,414,000 56,855,000
Granted (shares) 6,496,000  
Compensation cost not yet recognized $ 527.7  
Compensation cost not yet recognized, period for recognition 3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Acquisitions 3,600,000  
ESPP    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Acquisition price at lower of fair market value, percentage 85.00%  
Shares reserved for future issuance (shares) 4,830,720 3,214,287
2013 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
General vesting period 4 years  
Award expiration period from grant date 10 years  
Employee stock ownership, combined voting power of all stock 10.00%  
Minimum exercise price as a percentage of the fair value per share 110.00%  
Award expiration period, for excess voting power grants 5 years  
Shares reserved for future issuance (shares) 10,100,000 7,200,000
2013 Plan | Employee stock option | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grant date fair value, percentage 100.00%