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Convertible Senior Notes - Capped Call (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		9 Months Ended
	Aug. 31, 2020	Apr. 30, 2019	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes, net of issuance costs			$ 0	$ 984,096
2026 Notes | Senior Notes
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes, net of issuance costs	$ 984,096
Conversion price (in dollars per share)			$ 107.55
2025 Notes | Senior Notes
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes, net of issuance costs		$ 780,180
Conversion price (in dollars per share)			$ 51.56
Capped Call | 2026 Notes | Senior Notes
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes, net of issuance costs	$ 103,400
Debt instrument, convertible (in shares)			9,297,800
Conversion price (in dollars per share)			$ 156.44
Capped Call | 2025 Notes | Senior Notes
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes, net of issuance costs		$ 97,200
Debt instrument, convertible (in shares)			13,576,706
Conversion price (in dollars per share)			$ 79.32

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