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Convertible Senior Notes and Capped Call Transactions - Narrative (Details) |  | 9 Months Ended |
--- | --- | --- | ---
May 11, 2020 USD ($) $ / shares | Sep. 30, 2020 USD ($) tradingDay $ / shares | Sep. 30, 2019 USD ($) | Dec. 31, 2019 $ / shares
Debt Instrument [Line Items] |  |  |  |
Proceeds from issuance of convertible senior notes, net of issuance costs |  | $ 245,308,000 | $ 0 |
Purchases of capped calls |  | $ 29,348,000 | $ 0 |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.001 |  | $ 0.001
Cap price | $ / shares |  | $ 141.72 |  |
Percentage premium over the last reported sale price of company common stock used to calculate cap price |  | 100.00% |  |
2025 Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Equity component, net of discount and issuance costs |  | $ 30,794,000 |  |
Fair value of the notes |  | $ 354,714,000 |  |
Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Purchases of capped calls | $ 29,348,000 |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 |  |  |
Convertible Debt | 2025 Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount excluding purchasers' option | $ 220,000,000 |  |  |
Additional amount included in principal from exercised options | 33,000,000 |  |  |
Proceeds from issuance of convertible senior notes, net of issuance costs | $ 245,158,000 |  |  |
Interest rate, stated percentage | 1.25% |  |  |
Debt instrument, convertible, conversion ratio |  | 10.8556 |  |
Initial conversion price (in dollars per share) | $ / shares |  | $ 92.12 |  |
Repurchase of notes percentage |  | 100.00% |  |
Equity component, net of discount and issuance costs |  | $ 31,779,000 |  |
Interest rate, effective percentage |  | 4.51% |  |
Debt issuance costs of liability component |  | $ 6,857,000 |  |
Convertible Debt | 2025 Senior Notes | Additional paid-in capital |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuance costs of equity component |  | $ 985,000 |  |
Convertible Debt | 2025 Senior Notes | Debt Conversion, Option One |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Threshold trading days (in trading days) | tradingDay |  | 20 |  |
Threshold consecutive trading days | tradingDay |  | 30 |  |
Threshold percentage of conversion price |  | 130.00% |  |
Convertible Debt | 2025 Senior Notes | Debt Conversion, Option Two |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Threshold consecutive trading days | tradingDay |  | 5 |  |
Threshold percentage of conversion price |  | 98.00% |  |
Threshold consecutive business days | tradingDay |  | 5 |  |

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