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v3.20.2

Convertible Senior Notes, Net (Details) |  |  | 3 Months Ended | 7 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 15, 2019 USD ($) | Aug. 02, 2018 USD ($) shares | Sep. 30, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) shares | Mar. 31, 2014 USD ($) | Mar. 15, 2019 USD ($) shares | Sep. 30, 2020 USD ($) $ / shares | Sep. 30, 2019 USD ($) | Dec. 31, 2017 USD ($) offering | Dec. 31, 2014 USD ($) offering | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment for debt redemption |  |  |  |  |  |  |  |  | $ 0 | $ 704,000 |  |  |
Conversions of convertible senior notes for common stock |  |  |  |  |  | $ 33,778,000 |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversions of convertible senior notes for common stock (in shares) | shares |  |  |  |  |  | 1,967,361 |  |  |  |  |  |  |
Conversions of convertible senior notes for common stock |  |  |  |  |  | $ 20,000 |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  | $ 9.01 |  |  |  |  |  | $ 9.01 |  |  |  |
Additional Paid-In-Capital |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversions of convertible senior notes for common stock |  |  |  |  |  | $ 33,758,000 |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 575,000,000 |  |  |  |  |  | $ 575,000,000 |  |  |  |
Interest expense |  |  | 7,200,000 |  | $ 7,200,000 |  |  |  | 21,600,000 | 21,900,000 |  |  |
Non-cash interest expense |  |  | 1,500,000 |  | $ 1,500,000 |  |  |  | 4,500,000 | $ 4,600,000 |  |  |
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 | 2019 Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of debt offerings issued | offering |  |  |  |  |  |  |  |  |  |  |  | 2 |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  | $ 254,800,000 |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  | 5.50% |
Proceeds from issuance of convertible senior notes |  |  |  |  |  |  | $ 248,600,000 |  |  |  |  |  |
Principal amount redeemed |  | $ 206,200,000 |  |  |  |  |  | $ 47,900,000 |  |  |  |  |
Cash payment for debt redemption | $ 700,000 | $ 39,300,000 |  |  |  |  |  | $ 200,000 |  |  |  |  |
Convertible Debt | 2019 Notes | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversions of convertible senior notes for common stock (in shares) | shares |  | 10,020,328 |  |  |  | 1,967,361 |  | 2,775,509 |  |  |  |  |
Conversions of convertible senior notes for common stock |  |  |  |  |  | $ 33,800,000 |  |  |  |  |  |  |
Convertible Debt | 2019 Notes | Additional Paid-In-Capital |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversions of convertible senior notes for common stock |  | $ 166,000,000.0 |  |  |  |  |  | $ 13,900,000 |  |  |  |  |
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 |  | $ 345,000,000.0 |  |
Stated interest rate |  |  | 4.75% |  |  |  |  |  | 4.75% |  | 4.75% |  |
Proceeds from issuance of convertible senior notes |  |  |  |  |  |  |  |  |  |  | $ 337,500,000 |  |
Convertible senior notes, net |  |  | $ 339,700,000 |  |  |  |  |  | $ 339,700,000 |  |  |  |
Unamortized discount |  |  | 5,300,000 |  |  |  |  |  | 5,300,000 |  |  |  |
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 |  |  |  |  |  | $ 230,000,000 |  |  |  | $ 230,000,000.0
Stated interest rate |  |  | 5.38% |  |  |  |  |  | 5.38% |  |  |  | 5.375%
Proceeds from issuance of convertible senior notes |  |  |  | $ 223,700,000 |  |  |  |  |  |  |  |  |
Convertible senior notes, net |  |  | $ 224,900,000 |  |  |  |  |  | $ 224,900,000 |  |  |  |
Unamortized discount |  |  | $ 5,100,000 |  |  |  |  |  | 5,100,000 |  |  |  |
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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