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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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