Convertible Senior Notes - Outstanding Convertible Senior Notes - Summary (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Jun. 04, 2020	May 19, 2020	May 08, 2018	Jun. 27, 2017
Convertible Senior Notes
Net carrying amount	$ 1,534,448		$ 1,534,448		$ 1,225,671
2027 Notes
Convertible Senior Notes
Principal	1,000,000		1,000,000		1,000,000		$ 1,000,000
Less: Debt discount, net	(16,269)		(16,269)		(250,846)
Net carrying amount	983,731		983,731		749,154
Interest Expense
Contractual interest expense	3,125	$ 3,125	9,375	$ 9,375
Amortization of debt discount	838	9,370	2,502	27,592
Total	$ 3,963	$ 12,495	$ 11,877	$ 36,967
Effective interest rate of the liability component (as a percent)	1.60%	3.40%	1.60%	3.40%
2025 Notes
Convertible Senior Notes
Principal	$ 725		$ 725		730			$ 287,500
Less: Debt discount, net	(8)		(8)		(166)
Net carrying amount	717		717		564
Interest Expense
Contractual interest expense	2	$ 10	7	$ 1,080
Amortization of debt discount	1	48	2	4,546
Total	$ 3	$ 58	$ 9	$ 5,626
Effective interest rate of the liability component (as a percent)	1.80%	4.70%	1.80%	4.70%
Livongo Notes
Convertible Senior Notes
Principal	$ 550,000		$ 550,000		550,000	$ 550,000
Less: Debt discount, net	0		0		(74,047)
Net carrying amount	550,000		550,000		$ 475,953
Interest Expense
Contractual interest expense	1,203	$ 1,203	3,609	$ 3,609
Amortization of debt discount	0	4,858	0	14,389
Total	$ 1,203	$ 6,061	$ 3,609	$ 17,998
Effective interest rate of the liability component (as a percent)	0.90%	5.20%	0.90%	5.20%
2022 Notes
Convertible Senior Notes
Principal									$ 275,000