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Common stock and additional paid-in capital - Narrative (Details)
3 Months Ended 12 Months Ended
Nov. 07, 2024
USD ($)
Jun. 28, 2024
USD ($)
May 23, 2024
Dec. 31, 2024
USD ($)
vote
$ / shares
shares
Dec. 31, 2024
USD ($)
vote
$ / shares
shares
Dec. 31, 2023
USD ($)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Common stock, vote per share | vote       1 1  
Issuance of common shares, net         $ 15,500,000 $ 0
Sale of stock, consideration received on transaction $ 315,500,000          
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value         0 6,100,000
Share-based compensation arrangement by share-based payment award, options, outstanding, intrinsic value       $ 0 0 0
Share-based compensation arrangement by share-based payment award, options, exercisable, intrinsic value       0 0 0
Proceeds from stock options exercised         0 0
Share-based compensation arrangement by share-based payment award, options, vested in period, fair value         3,700,000  
Share-based compensation arrangement by share-based payment award, options, grants in period, fair value         0 3,600,000
Share-based payment arrangement, amount capitalized         0 700,000
Stock options            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based payment arrangement, expense, tax benefit         0 0
Stock-based compensation         100,000 3,600,000
Share-based payment arrangement, nonvested award, cost not yet recognized, amount       $ 200,000 $ 200,000  
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition         10 months 28 days  
Stock options | LTIP Plan            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares) | shares       1,342,200 1,342,200  
Number of shares received from each stock option conversion (in shares) | shares         1  
Share-based compensation arrangement by share-based payment award, award vesting period         3 years  
Share-based compensation arrangement by share-based payment award, expiration period         10 years  
Share-based compensation arrangement by share-based payment award, expiration period following employee termination         90 days  
Stock options | LTIP Plan | Share-Based Payment Arrangement, Tranche One            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage         33.33%  
Stock options | LTIP Plan | Share-Based Payment Arrangement, Tranche Two            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage         33.33%  
Stock options | LTIP Plan | Share-Based Payment Arrangement, Tranche Three            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage         33.33%  
Restricted share units            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based payment arrangement, expense, tax benefit         $ 0 0
Stock-based compensation         8,700,000 9,800,000
Share-based payment arrangement, nonvested award, cost not yet recognized, amount       $ 4,400,000 $ 4,400,000  
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition         1 year 2 months 1 day  
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period, fair value         $ 13,200,000  
Performance Shares            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, award vesting period         3 years  
Share-based payment arrangement, expense, tax benefit         $ 0 0
Stock-based compensation         $ 100,000 $ 0
KSP Convertible Notes | Convertible Debt            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Debt conversion, converted instrument, shares issued (in shares) | shares         7,228,200  
ATM Agreement            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Sale of stock, maximum aggregate offering price   $ 75,000,000.0        
Issuance of common shares, net       $ 15,500,000    
Sale of stock, price per share (in dollars per share) | $ / shares       $ 2.26 $ 2.26  
Sale of stock, consideration received on transaction       $ 16,400,000    
Proceeds of stock issuance costs       900,000    
Sale of stock, remaining authorized amount       $ 58,600,000 $ 58,600,000  
Minimum            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Stockholders' equity note, stock split, conversion ratio     0.5      
Minimum | Restricted share units            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, award vesting period         6 months  
Maximum            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Stockholders' equity note, stock split, conversion ratio     0.125      
Maximum | Restricted share units            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, award vesting period         3 years