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Convertible Senior Notes, Net - Additional Information (Details) |  |  | 3 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 15, 2019 USD ($) | Aug. 02, 2018 USD ($) shares | Dec. 31, 2019 USD ($) $ / shares | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) $ / shares | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) offering | Dec. 31, 2014 USD ($) offering
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible senior notes |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 226,550,000 | $ 343,275,000 |
Cash payment for debt redemption |  |  |  |  |  |  |  |  |  |  |  | 704,000 | 40,461,000 | 0 |
Exchange of Notes for common stock |  |  |  |  |  |  |  |  |  |  |  | 33,778,000 | 180,016,000 |  |
Loss on early extinguishment of debt |  |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ (2,573,000) | $ 0 | $ 0 |  | 0 | 2,573,000 | 1,947,000 |
Convertible senior notes, net |  |  | 561,573,000 |  |  |  | 592,000,000 |  |  |  | $ 592,000,000 | 561,573,000 | 592,000,000 |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  | 575,000,000 |  |  |  |  |  |  |  |  | 575,000,000 |  |  |
Interest expense on debt |  |  |  |  |  |  |  |  |  |  |  | 29,100,000 | 28,200,000 | 18,700,000 |
Additional non-cash interest expense |  |  |  |  |  |  |  |  |  |  |  | 6,000,000.0 | 7,100,000 | 4,700,000 |
Convertible Debt | 2019 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of debt offerings issued | offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Principal Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 254,800,000
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 |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  | 0 | 2,600,000 | $ 0 |
Convertible Debt | 2022 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of debt offerings issued | offering |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Principal Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 345,000,000 |
Proceeds from issuance of convertible senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 337,500,000 |
Convertible senior notes, net |  |  | 337,800,000 |  |  |  |  |  |  |  |  | 337,800,000 |  |  |
Unamortized discount |  |  | 7,200,000 |  |  |  |  |  |  |  |  | 7,200,000 |  |  |
Convertible Debt | 2023 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  |  | 230,000,000.0 |  |  |  | $ 230,000,000.0 |  | $ 230,000,000.0 |  |
Proceeds from issuance of convertible senior notes |  |  |  |  |  |  | $ 223,700,000 |  |  |  |  |  |  |  |
Convertible senior notes, net |  |  | 223,800,000 |  |  |  |  |  |  |  |  | 223,800,000 |  |  |
Unamortized discount |  |  | $ 6,200,000 |  |  |  |  |  |  |  |  | $ 6,200,000 |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of convertible senior notes for common stock (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 1,967,361 | 10,828,475 |  |
Exchange of Notes for common stock |  |  |  |  |  |  |  |  |  |  |  | $ 20,000 | $ 108,000 |  |
Share price (in dollars per share) | $ / shares |  |  | $ 18.29 |  |  |  | $ 16.66 |  |  |  | $ 16.66 | $ 18.29 | $ 16.66 |  |
Common Stock | Convertible Debt | 2019 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of convertible senior notes for common stock (in shares) | shares |  | 10,020,328 |  |  |  | 1,967,361 |  |  |  |  | 2,775,509 |  | 10,828,475 |  |
Exchange of Notes for common stock |  |  |  |  |  | $ 33,800,000 |  |  |  |  |  |  |  |  |
Additional Paid-In-Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of Notes for common stock |  |  |  |  |  |  |  |  |  |  |  | $ 33,758,000 | $ 179,908,000 |  |
Additional Paid-In-Capital | Convertible Debt | 2019 and 2022 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of Notes for common stock |  |  |  |  |  |  |  |  |  |  |  | 15,400,000 |  |  |
Additional Paid-In-Capital | Convertible Debt | 2019 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of Notes for common stock |  | $ 166,000,000.0 |  |  |  |  |  |  |  |  | $ 13,900,000 |  |  |  |
Additional Paid-In-Capital | Convertible Debt | 2022 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of Notes for common stock |  |  |  |  |  |  |  |  |  |  |  | 11,000,000.0 |  |  |
Additional Paid-In-Capital | Convertible Debt | 2023 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of Notes for common stock |  |  |  |  |  |  |  |  |  |  |  | $ 4,400,000 |  |  |

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