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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