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v3.22.1

Convertible Senior Notes, Net (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2022 USD ($) $ / shares | Mar. 31, 2021 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) offering | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Stockholders' equity attributable to parent | $ 2,251,018,000 | $ 2,275,753,000 |  |  | $ 2,294,626,000 | $ 2,270,529,000
Adjustment due to Adoption of ASU |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stockholders' equity attributable to parent | $ (3,400,000) |  |  |  | (3,416,000) |
Common Stock |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Share price (in dollars per share) | $ / shares | $ 13.93 |  |  |  |  |
Stockholders' equity attributable to parent | $ 1,405,000 | 1,398,000 |  |  | 1,399,000 | 1,393,000
Additional Paid-In-Capital |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stockholders' equity attributable to parent | 2,703,354,000 | 2,707,855,000 |  |  | 2,721,042,000 | 2,707,792,000
Additional Paid-In-Capital | Adjustment due to Adoption of ASU |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stockholders' equity attributable to parent |  |  |  |  | (15,408,000) |
Accumulated Deficit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stockholders' equity attributable to parent | (453,809,000) | (433,568,000) |  |  | (427,883,000) | $ (438,724,000)
Accumulated Deficit | Adjustment due to Adoption of ASU |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stockholders' equity attributable to parent |  |  |  |  | 11,992,000 |
Convertible Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount | 575,000,000 |  |  |  | 575,000,000 |
Interest expense |  | 7,200,000 |  |  |  |
Non-cash interest expense | 800,000 | $ 1,500,000 |  |  |  |
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 |
Stated interest rate | 4.75% |  |  | 4.75% | 4.75% |
Proceeds from issuance of senior secured notes |  |  |  | $ 337,500,000 |  |
Convertible senior notes, net | $ 344,900,000 |  |  |  |  |
Unamortized discount | 100,000 |  |  |  |  |
Convertible Debt | 2022 Notes | Additional Paid-In-Capital |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Convertible debt, carrying amount of equity component |  |  |  |  | $ 11,000,000 |
Convertible Debt | 2023 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount | $ 230,000,000 |  | $ 230,000,000 |  | $ 230,000,000 |
Stated interest rate | 5.38% |  | 5.375% |  | 5.38% |
Proceeds from issuance of senior secured notes |  |  | $ 223,700,000 |  |  |
Convertible senior notes, net | $ 228,800,000 |  |  |  |  |
Unamortized discount | $ 1,200,000 |  |  |  |  |
Convertible Debt | 2023 Notes | Additional Paid-In-Capital |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Convertible debt, carrying amount of equity component |  |  |  |  | $ 4,400,000 |
Convertible Debt | 2022 and 2023 Notes | Additional Paid-In-Capital |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Convertible debt, carrying amount of equity component |  |  |  |  | $ 15,400,000 |

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