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Convertible Senior Notes - Narrative (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) option shares | May 31, 2018 USD ($) d $ / shares shares | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) option shares | Mar. 31, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  | $ 7,175,000 | $ (659,000) |
Adjustments to additional paid in capital, equity component of convertible debt |  |  | $ 1,073,000 | $ 9,086,000 | $ 2,745,000 |  |  |
Adjustments to additional paid-in-capital from warrants | $ 400,000 |  |  |  |  |  |  |
Payments to unwind warrants | 16,500,000 |  |  |  |  |  |  |
Proceeds from unwinding convertible bond hedges | $ 16,900,000 |  |  |  |  |  |  |
Number of options under convertible bond hedges | option | 645,500 |  |  | 645,500 |  |  |  |
Convertible Notes | 2023 Convertible Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount outstanding |  | $ 750,000,000.0 | 345,729,000 |  |  | 345,729,000 |  | $ 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 | $ 104,500,000 |  | $ 149,600,000 | $ 104,500,000 |  | 149,600,000 |  |
Repayments of notes | 109,100,000 |  |  |  |  | 153,700,000 |  |
Accrued Interest | $ 200,000 |  |  |  |  | 300,000 |  |
Loss on extinguishment of debt |  |  |  |  |  | 7,200,000 |  |
Increase (decrease) in debt discount |  |  |  |  |  | 13,500,000 |  |
Adjustments to additional paid in capital, equity component of convertible debt |  |  |  |  |  | $ 10,200,000 |  |
Warrants issued in public offering (shares) | shares | 2,597,750 | 3,018,327 |  | 2,597,750 |  |  |  |
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 |  | $ 90,000,000.0 |  |  |  |  |  |
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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