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v3.21.2

Convertible Senior Notes, Net (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) $ / shares | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) $ / shares | Jun. 30, 2020 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) offering | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of senior secured notes |  |  | $ 500,000,000 | $ 0 |  |  |
Unamortized discount | $ 4,583,000 |  | $ 4,583,000 |  |  |  |
Common Stock |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares | $ 15.95 |  | $ 15.95 |  |  |  |
Convertible Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | $ 575,000,000 |  | $ 575,000,000 |  |  |  | $ 575,000,000
Interest expense | 7,200,000 |  | 14,400,000 |  |  |  |
Non-cash interest expense | 1,600,000 | $ 1,500,000 | 3,100,000 | $ 3,000,000.0 |  |  |
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 |  |  |  |  |  | $ 345,000,000.0 | $ 345,000,000
Stated interest rate |  |  |  |  |  | 4.75% | 4.75%
Proceeds from issuance of senior secured notes |  |  |  |  |  | $ 337,500,000 |
Convertible senior notes, net | 341,700,000 |  | 341,700,000 |  |  |  |
Unamortized discount | 3,300,000 |  | 3,300,000 |  |  |  |
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 |  |  |  |  | $ 230,000,000.0 |  | $ 230,000,000
Stated interest rate |  |  |  |  | 5.375% |  | 5.38%
Proceeds from issuance of senior secured notes |  |  |  |  | $ 223,700,000 |  |
Convertible senior notes, net | 226,100,000 |  | 226,100,000 |  |  |  |
Unamortized discount | $ 3,900,000 |  | 3,900,000 |  |  |  |
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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