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Equity Award Plans - Narrative (Details) - USD ($)
shares in Thousands, $ in Millions
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares reserved for future issuance (shares) 78,320 76,852
Compensation cost not yet recognized $ 307.0  
Compensation cost not yet recognized, period for recognition 2 years 7 months 6 days  
Employee Stock Purchase Plan (ESPP)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares reserved for future issuance (shares) 4,316 3,428
Acquisition price at lower of fair market value, percentage 85.00%  
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) 15,500 11,900
2013 Plan | Employee stock option    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grant date fair value, percentage, no less than 100.00%