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Debt - Senior Secured Convertible Notes due 2027, Senior Secured Convertible Notes due 2031, and the Convertible Notes Exchange (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 15, 2024
USD ($)
component
$ / shares
Apr. 30, 2025
USD ($)
Sep. 30, 2025
USD ($)
$ / shares
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
shares
$ / shares
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
$ / shares
Nov. 17, 2020
$ / shares
Line of Credit Facility                
Principal balance     $ 996,400,000   $ 996,400,000   $ 1,111,800,000  
Common stock, par value (in dollars per share) | $ / shares     $ 0.01   $ 0.01   $ 0.01  
Reduction of additional paid in capital due to convertible notes exchange         $ (2,043,000)      
Gain on early extinguishment of debt     $ (24,000) $ (176,000) (1,481,000) $ 354,000    
2027 Notes | Convertible Debt                
Line of Credit Facility                
Stated interest rate (as a percent)               6.00%
Repurchased face amount $ 223,600,000 $ 14,000,000            
Debt instrument, debt repurchased, rate 1.110              
Repurchase amount $ 248,200,000 $ 15,000,000            
Payments of accrued interest $ 10,000,000              
Principal balance     24,100,000   24,100,000   $ 38,100,000  
Common stock, par value (in dollars per share) | $ / shares $ 0.01              
Redemption rate (as a percent)   105.00%            
Number of components | component 2              
Reduction of additional paid in capital due to convertible notes exchange         2,000,000.0   237,500,000  
Fair value of equity component of debt     $ 40,000,000.0   $ 40,000,000.0   42,000,000.0  
Aggregate shares receivable upon conversion (in shares) | shares         14,300,000      
Effective interest rate (as a percent)     10.50%   10.50%      
Initial conversion rate (in shares) | shares         0      
2027 Notes | Convertible Debt | Fair Value, Inputs, Level 2                
Line of Credit Facility                
Debt fair value     $ 27,000,000.0   $ 27,000,000.0   44,600,000  
2027 Notes | Convertible Debt | Period 1                
Line of Credit Facility                
Redemption rate (as a percent) 110.00%              
2027 Notes | Convertible Debt | Scenario, Plan                
Line of Credit Facility                
Debt instrument, share conversion rate (per $1,000) 20.00%              
Conversion price (in dollars per share) | $ / shares $ 5.00             $ 5.00
Aggregate shares receivable upon conversion (in shares) | shares         4,800,000      
2027 Notes | Senior Secured Term Loan                
Line of Credit Facility                
Gain on early extinguishment of debt         $ 0      
2031 Notes | Convertible Debt                
Line of Credit Facility                
Stated interest rate (as a percent) 6.00%              
Principal balance $ 110,000   223,700,000   223,700,000   223,700,000  
Common stock, par value (in dollars per share) | $ / shares $ 0.01              
Redemption rate (as a percent) 140.00%              
Debt redemption right, amount $ 72,800,000              
Debt redemption right, percentage of principal (as a percent) 30.00%              
Minimum qualified cash required $ 30,000,000.0              
Number of components | component 2              
Fair value of equity component of debt     $ 80,400,000   $ 80,400,000   $ 80,400,000  
Aggregate shares receivable upon conversion (in shares) | shares         143,900,000      
Debt instrument, issued premium rate (as a percent) 50.00%              
Effective interest rate (as a percent)     6.60%   6.60%      
Initial conversion rate (in shares) | shares         0      
2031 Notes | Convertible Debt | Period 1                
Line of Credit Facility                
Redemption rate (as a percent) 110.00%              
Total gross leverage ratio 1.5              
2031 Notes | Convertible Debt | Scenario, Plan                
Line of Credit Facility                
Debt instrument, share conversion rate (per $1,000) 20.00%              
Conversion price (in dollars per share) | $ / shares $ 5.00              
Aggregate shares receivable upon conversion (in shares) | shares         44,700,000      
2027 Notes and the 2031 Notes | Convertible Debt                
Line of Credit Facility                
Interest expense     $ 3,700,000 7,300,000 $ 11,400,000 21,800,000    
Interest paid         7,800,000 14,600,000    
Amortization of the discount     400,000 3,800,000 1,200,000 11,000,000    
Amortization of debt issuance costs     0 $ 0 0 $ 0    
2029 Delayed Draw Facility | Senior Secured Term Loan                
Line of Credit Facility                
Line of credit drawn     $ 15,000,000.0   $ 15,000,000.0