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Share-based compensation and stockholders' equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
May 17, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Nonvested options forfeited (in shares)     200,000  
At-The-Market Offering        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Sale of stock, aggregate offering amount, maximum       $ 150.0
Sale of stock, number of shares issued in transaction (in shares) 0 1,100,000    
Sale of stock, consideration received on transaction, gross   $ 9.1    
Sale of stock, price per share (in dollars per share)   $ 8.22    
Sale of stock, amount remaining available for sale of shares $ 140.9   $ 140.9  
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options granted (in shares)     4,000,000  
Stock Options | Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, percentage     33.33%  
Stock Options | Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, percentage     33.33%  
Stock Options | Tranche Three        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, percentage     33.33%  
Performance Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options granted (in shares)     800,000  
Award vesting period     5 years  
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity instruments other than options granted (in shares)     200,000  
Equity instruments other than options, forfeited in period (in shares)     100,000  
Restricted Stock Units | Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, percentage     33.33%  
Restricted Stock Units | Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, percentage     33.33%  
Restricted Stock Units | Tranche Three        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, percentage     33.33%  
Long-Term Incentive Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted long-term incentive award     $ 8.0  
Award vesting period     5 years  
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     3 years  
Performance Shares | Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, percentage     33.33%  
Performance Shares | Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, percentage     33.33%  
Performance Shares | Tranche Three        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, percentage     33.33%