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v3.20.2

Convertible Senior Notes - Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | May 31, 2018 USD ($) d $ / shares shares | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  | $ 659,000 | $ 0 |
Adjustments to additional paid in capital, equity component of convertible debt |  |  | $ 23,000 | $ 2,745,000 |  |  |
Convertible Notes | 2023 Convertible Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount outstanding |  | $ 750,000,000.0 |  |  | 515,560,000 |  | $ 750,000,000
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 |  |
Debt premium |  |  |  |  | 13,700,000 |  |
Long-term debt | $ 234,400,000 |  |  | $ 234,400,000 | 515,600,000 |  |
Repayments of notes | 203,800,000 |  |  |  |  |  |
Accrued Interest | $ 600,000 |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  | 700,000 |  |
Increase (decrease) in debt discount |  |  |  |  | 32,700,000 |  |
Adjustments to additional paid in capital, equity component of convertible debt |  |  |  |  | $ 2,700,000 |  |
Warrants issued in public offering (shares) | shares |  | 3,018,327 |  |  |  |  |
Payments for convertible bond hedges |  | $ 140,300,000 |  |  |  |  |
Warrant exercise price (USD per share) | $ / shares |  | $ 315.38 |  |  |  |  |
Warrant derivative in connection with Notes |  | $ 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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