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v3.21.1

Convertible Senior Notes, Net (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) $ / shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) offering
Debt Instrument [Line Items] |  |  |
Unamortized discount | $ 4,780,000 |  |
Common Stock |  |  |
Debt Instrument [Line Items] |  |  |
Share price (in dollars per share) | $ / shares | $ 13.97 |  |
Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount | $ 575,000,000 |  |
Interest expense | 7,200,000 |  |
Non-cash interest expense | 1,500,000 |  |
Convertible Debt | 2019 and 2022 Notes | Additional Paid-In-Capital |  |  |
Debt Instrument [Line Items] |  |  |
Conversions of convertible senior notes for common stock | 15,400,000 |  |
Convertible Debt | 2022 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Number of debt offerings issued | offering |  |  | 2
Debt instrument, face amount | $ 345,000,000 |  | $ 345,000,000.0
Stated interest rate | 4.75% |  | 4.75%
Proceeds from issuance of Notes |  |  | $ 337,500,000
Convertible senior notes, net | $ 341,000,000.0 |  |
Unamortized discount | 4,000,000.0 |  |
Convertible Debt | 2022 Notes | Additional Paid-In-Capital |  |  |
Debt Instrument [Line Items] |  |  |
Conversions of convertible senior notes for common stock | 11,000,000.0 |  |
Convertible Debt | 2023 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount | $ 230,000,000 | $ 230,000,000.0 |
Stated interest rate | 5.38% | 5.375% |
Proceeds from issuance of Notes |  | $ 223,700,000 |
Convertible senior notes, net | $ 225,700,000 |  |
Unamortized discount | 4,300,000 |  |
Convertible Debt | 2023 Notes | Additional Paid-In-Capital |  |  |
Debt Instrument [Line Items] |  |  |
Conversions of convertible senior notes for common stock | $ 4,400,000 |  |

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