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Convertible Senior Notes - Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 31, 2018 USD ($) d $ / shares shares | Sep. 30, 2021 USD ($) option shares | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) option shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  | $ 7,303,000 | $ (659,000) |
Adjustments to additional paid in capital, equity component of convertible debt |  | $ 32,000 | $ 1,073,000 | $ 9,086,000 | $ 2,745,000 |  |  |
Adjustments to additional paid-in-capital from warrants |  |  |  |  |  | 500,000 |  |
Payments to unwind warrants |  |  |  |  |  | 18,400,000 |  |
Proceeds from unwinding convertible bond hedges |  |  |  |  |  | $ 18,900,000 |  |
Number of options under convertible bond hedges | option |  | 598,021 |  |  |  | 598,021 |  |
Convertible Notes | 2023 Convertible Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount outstanding | $ 750,000,000 | $ 343,301,000 |  |  |  | $ 343,301,000 |  | $ 495,280,000
Interest rate (as a percent) | 0.75% |  |  |  |  |  |  |
Proceeds from debt, net of issuance costs | $ 733,100,000 |  |  |  |  |  |  |
Initial conversion rate (shares per $1,000) | 0.0040244 |  |  |  |  |  |  |
Initial conversion price (USD per share) | $ / shares | $ 248.48 |  |  |  |  |  |  |
Debt issuance costs |  | 16,900,000 |  |  |  | 16,900,000 |  |
Debt premium |  | 13,700,000 |  |  |  | 13,700,000 |  |
Repurchased amount of debt instrument |  | $ 152,000,000 |  |  |  | 152,000,000 |  |
Repayments of notes |  |  |  |  |  | 156,000,000 |  |
Accrued Interest |  |  |  |  |  | 300,000 |  |
Loss on extinguishment of debt |  |  |  |  |  | 7,300,000 |  |
Increase (decrease) in debt discount |  |  |  |  |  | 13,700,000 |  |
Adjustments to additional paid in capital, equity component of convertible debt |  |  |  |  |  | $ 10,200,000 |  |
Warrants issued in public offering (shares) | shares | 3,018,327 | 2,559,254 |  |  |  | 2,559,254 |  |
Payments for convertible bond hedges | $ 140,300,000 |  |  |  |  |  |  |
Warrant exercise price (USD per share) | $ / shares | $ 315.38 |  |  |  |  |  |  |
Adjustments to additional paid-in-capital from warrants | $ 90,000,000 |  |  |  |  |  |  |
Convertible Notes | 2023 Convertible Senior Notes | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold trading days | d | 20 |  |  |  |  |  |  |
Consecutive trading days | d | 30 |  |  |  |  |  |  |
Stock price trigger to classify convertible debt as current (as a percent) | 130.00% |  |  |  |  |  |  |
Convertible Notes | 2023 Convertible Senior Notes | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold trading days | d | 5 |  |  |  |  |  |  |
Consecutive trading days | d | 10 |  |  |  |  |  |  |
Maximum threshold of debt trading price trigger (as a percent) | 98.00% |  |  |  |  |  |  |

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