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Convertible Senior Notes - Outstanding Convertible Senior Notes - Issuances (Details) - USD ($)
$ in Thousands
May 19, 2020
May 08, 2018
Mar. 31, 2022
Dec. 31, 2021
Jun. 04, 2020
Jun. 27, 2017
2027 Notes            
Convertible Senior Notes            
Face amount $ 1,000,000   $ 1,000,000 $ 1,000,000    
Interest rate (as a percent) 1.25%          
Net proceeds from issuance of Notes $ 975,900          
Offering costs $ 24,100          
2025 Notes            
Convertible Senior Notes            
Face amount   $ 287,500 730 730    
Interest rate (as a percent)   1.375%        
Net proceeds from issuance of Notes   $ 279,100        
Offering costs   $ 8,400        
Livongo Notes            
Convertible Senior Notes            
Face amount     $ 550,000 $ 550,000 $ 550,000  
Interest rate (as a percent)         0.875%  
2022 Notes            
Convertible Senior Notes            
Face amount           $ 275,000
Interest rate (as a percent)           3.00%