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Share-based compensation and stockholders' equity - Narrative (Details)
$ / shares in Units, shares in Millions
 3 Months Ended 9 Months Ended
Sep. 17, 2024
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
Mar. 31, 2024
USD ($)
Sep. 30, 2025
USD ($)
increment
$ / shares
shares
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
Aug. 30, 2024
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Nonvested options forfeited (in shares)         0.4        
Excise tax liability accrued for common stock repurchases | $   $ 200,000     $ 200,000     $ 0  
Repurchases of common stock | $   8,900,000 $ 6,900,000            
Warrant liability | $   14,400,000     14,400,000   $ 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 | $   $ 8,900,000     $ 15,800,000        
Treasury stock, shares, acquired (in shares)   1.1     2.3        
Shares average cost price (in dollars per share) | $ / shares   $ 7.87     $ 7.00        
Remaining authorized amount | $   $ 34,200,000     $ 34,200,000        
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)         2.7        
Equity instruments other than options, forfeited in period (in shares)         0.3        
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