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Share-based compensation and stockholders' equity - Stock Options, Restricted Stock Units, and Performance Stock Units (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Performance Shares And Restricted Stock Units (RSUs)    
Aggregate Intrinsic Value    
Target payout percentage 100.00%  
2006 Stock Incentive Plan    
Number of Shares    
Stock options outstanding, beginning of period (in shares) 1,700,000  
Stock options granted (in shares) 700,000  
Stock options exercised (in shares) 0  
Stock options forfeited (in shares) (1,300,000)  
Stock options outstanding, end of period (in shares) 1,100,000  
Stock options exercisable, end of period (in shares) 400,000  
Weighted-Average Exercise Price    
Stock options outstanding, beginning of period (in dollars per share) $ 51.74  
Stock options granted (in dollars per share) 9.66  
Stock options exercised (in dollars per share) 0  
Stock options forfeited (in dollars per share) 42.82  
Stock options outstanding, end of period (in dollars per share) 34.44  
Exercisable, end of period (in dollars per share) $ 56.60  
Weighted Average Remaining Contractual Term (in Years)    
Stock options outstanding 5 years 1 month 6 days  
Stock options exercisable 3 years 4 months 24 days  
Aggregate Intrinsic Value    
Stock options outstanding $ 0.0  
Stock options exercisable $ 0.0  
2006 Stock Incentive Plan | Performance Shares And Restricted Stock Units (RSUs)    
Number of Shares    
Restricted/performance stock units outstanding, beginning of period (in shares) 2,200,000  
Restricted/performance stock units granted (in shares) 2,400,000  
Restricted/performance stock units vested (in shares) (700,000)  
Restricted/performance stock units forfeited (in shares) (1,300,000)  
Restricted/performance stock units outstanding, end of period (in shares) 2,600,000  
Weighted-Average Grant Date Fair Value    
Restricted/performance stock units outstanding, beginning of period (in dollars per share) $ 42.30  
Restricted/performance stock units granted (in dollars per share) 8.51  
Restricted/performance stock units vested (in dollars per share) 46.73  
Restricted/performance stock units forfeited (in dollars per share) 26.92  
Restricted/performance stock units outstanding, end of period (in dollars per share) $ 16.57  
Aggregate Intrinsic Value    
Restricted/performance stock units outstanding $ 6.2 $ 25.8