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Debt - Convertible Senior Notes and Capped Call (Narrative) (Details) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2020 USD ($) shares | May 31, 2018 USD ($) $ / shares | Jun. 30, 2020 USD ($) $ / shares | Sep. 30, 2023 USD ($) $ / shares shares | Sep. 30, 2022 USD ($) shares | Sep. 30, 2023 USD ($) day $ / shares Rate shares | Sep. 30, 2022 USD ($) shares | Sep. 29, 2023 $ / shares | Dec. 31, 2022 USD ($) | May 21, 2020 $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Cash consideration to repurchase note |  |  |  |  |  | $ 0 | $ 34,057,000 |  |  |
Interest expense, debt |  |  |  | $ 0 | $ 0 | 0 | 0 |  |  |
Issuance of common stock upon partial conversion of the 2023 convertible senior notes |  |  |  |  | $ (16,000) | $ 0 | $ (275,000) |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Equity component from partial repurchase of 2023 convertible senior notes (in shares) | shares |  |  |  |  | 0 | 2,000 | 574,000 |  |  |
Convertible Senior Notes, Due 2025 | Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate on debt (as a percent) |  |  | 0.50% |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  | $ 728,800,000 |  |  |  |  |  |  |
Conversion ratio on convertible debt | Rate |  |  |  |  |  | 0.74437% |  |  |  |
Conversion price on convertible debt (in USD per share) | $ / shares |  |  |  | $ 134.34 |  | $ 134.34 |  |  |  |
Premium on conversion price in relation to closing price (as a percent) |  |  |  |  |  |  |  |  |  | 30.00%
Closing price of common stock (in USD per share) | $ / shares |  |  |  |  |  |  |  | $ 64.30 |  | $ 103.34
Share price of common stock with conversion premium (in USD per share) | $ / shares |  |  |  | $ 174.64 |  | $ 174.64 |  |  |  |
Sinking fund payment |  |  |  |  |  | $ 0 |  |  |  |
Cap price of the capped call transactions (in USD per share) | $ / shares |  |  | $ 206.68 |  |  |  |  |  |  |
Number of shares covered in the capped call transactions (in shares) | shares |  |  |  | 5,600,000 |  | 5,600,000 |  |  |  |
Long-term debt |  |  |  | $ 741,169,000 |  | $ 741,169,000 |  |  | $ 738,376,000 |
Interest expense, debt |  |  |  | $ 934,000 | $ 935,000 | $ 2,803,000 | $ 2,804,000 |  |  |
Convertible Senior Notes, Due 2025 | Convertible Debt | Fundamental Change Event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt redemption price as percentage of principal amount (as a percent) |  |  |  |  |  | 100.00% |  |  |  |
Convertible Senior Notes, Due 2025 | Convertible Debt | On or After June 6, 2023 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of trading days (in days) | day |  |  |  |  |  | 20 |  |  |  |
Number of consecutive trading days (in days) | day |  |  |  |  |  | 30 |  |  |  |
Threshold percentage of stock price trigger (as a percent) |  |  |  |  |  | 130.00% |  |  |  |
Debt redemption price as percentage of principal amount (as a percent) |  |  |  |  |  | 100.00% |  |  |  |
Number of trading days preceding notice of redemption (in days) | day |  |  |  |  |  | 2 |  |  |  |
Convertible Senior Notes, Due 2025 | Convertible Debt | Convertible, Term One |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of trading days (in days) | day |  |  |  |  |  | 20 |  |  |  |
Number of consecutive trading days (in days) | day |  |  |  |  |  | 30 |  |  |  |
Threshold percentage of stock price trigger (as a percent) |  |  |  |  |  | 130.00% |  |  |  |
Convertible Senior Notes, Due 2025 | Convertible Debt | Convertible, Term Two |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of trading days (in days) | day |  |  |  |  |  | 5 |  |  |  |
Number of consecutive trading days (in days) | day |  |  |  |  |  | 5 |  |  |  |
Threshold percentage of stock price trigger (as a percent) |  |  |  |  |  | 98.00% |  |  |  |
Convertible Senior Notes, Due 2025 | Convertible Debt | Private Placement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt |  |  | $ 747,500,000 |  |  |  |  |  |  |
Option to purchase additional debt through private offering |  |  | $ 97,500,000 |  |  |  |  |  |  |
Convertible Senior Notes, Due 2023 | Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate on debt (as a percent) | 0.125% |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 250,800,000 |  |  |  |  |  |  |  |
Conversion price on convertible debt (in USD per share) | $ / shares |  |  |  | $ 40.82 |  | $ 40.82 |  |  |  |
Cap price of the capped call transactions (in USD per share) | $ / shares |  | $ 62.80 |  |  |  |  |  |  |  |
Number of shares covered in the capped call transactions (in shares) | shares |  |  |  | 6,300,000 |  | 6,300,000 |  |  |  |
Debt instrument, repurchase amount | $ 181,000,000 |  |  | $ 194,700,000 |  | $ 194,700,000 |  |  |  |
Aggregate consideration to repurchase note | 449,600,000 |  |  |  |  |  |  |  |  |
Cash consideration to repurchase note | $ 181,000,000 |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 0 |  | $ 0 |  |  | $ 200,000 |
Convertible Senior Notes, Due 2023 | Convertible Debt | Common Stock |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Equity component from partial repurchase of 2023 convertible senior notes (in shares) | shares | 2,723,581 |  |  |  |  | 370,877 |  |  |  |
Issuance of common stock upon partial conversion of the 2023 convertible senior notes |  |  |  |  |  | $ 74,500,000 |  |  |  |
Convertible Senior Notes, Due 2023 | Convertible Debt | Private Placement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt |  | $ 258,800,000 |  |  |  |  |  |  |  |

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