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Share-based compensation and stockholders' equity - Narrative (Details)
$ / shares in Units, shares in Millions
 3 Months Ended 6 Months Ended
Sep. 17, 2024
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
$ / shares
shares
Mar. 31, 2024
USD ($)
increment
Jun. 30, 2025
USD ($)
$ / shares
shares
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Aug. 30, 2024
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Nonvested options forfeited (in shares)       0.3      
Repurchases of common stock | $   $ 6,900,000          
Warrant liability | $   9,600,000   $ 9,600,000   $ 16,200,000  
2025 Share Repurchase Program              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share repurchase program, authorized, amount | $         $ 50,000,000    
Repurchases of common stock | $   $ 6,900,000   $ 6,900,000      
Treasury stock, shares, acquired (in shares)   1.1   1.1      
Shares average cost price (in dollars per share) | $ / shares   $ 6.12   $ 6.12      
Remaining authorized amount | $   $ 43,100,000   $ 43,100,000      
Series I Warrants              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Class of warrant or right, number of securities called by warrants or rights (in shares)             1.0
Series II Warrants              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Class of warrant or right, number of securities called by warrants or rights (in shares)             1.5
Subscription Agreement              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Sale of stock, number of shares issued in transaction (in shares) 1.1            
Consideration received on transaction | $ $ 10,000,000            
Sale of stock, price per share (in dollars per share) | $ / shares $ 8.98            
Liabilities, fair value adjustment | $ $ 1,600,000            
Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options granted (in shares)       1.6      
Restricted Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Equity instruments other than options granted (in shares)       2.5      
Equity instruments other than options, forfeited in period (in shares)       0.2      
Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Equity instruments other than options granted (in shares)       0.3      
Award performance period       1 year      
Award vesting period     3 years        
Equity instruments other than options, forfeited in period (in shares)       0.0      
Long-Term Incentive Award              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted long-term incentive award | $     $ 8,000,000        
Award vesting period     5 years        
Performance Stock Option              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period     5 years        
Other Equity Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of vesting increments | increment     3