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Share-based compensation and stockholders' equity - Narrative (Details)
 3 Months Ended 12 Months Ended
Sep. 17, 2024
USD ($)
$ / shares
shares
Jun. 30, 2023
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
plan
vote
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Aug. 30, 2024
shares
Sep. 28, 2023
shares
May 31, 2023
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of stock based employee compensation plans | plan     2          
Contractual life of awards     7 years          
Preferred stock, shares authorized (in shares) | shares     15,000,000.0 15,000,000.0        
Preferred stock, par value (in dollars per share) | $ / shares     $ 0.001 $ 0.001        
Common stock, par value (in dollars per share) | $ / shares     $ 0.001 $ 0.001 $ 0.001      
Common stock, shares authorized (in shares) | shares     200,000,000.0 200,000,000.0        
Common stock, voting rights | vote     1          
Warrant liability     $ 16,200,000 $ 0        
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) | shares           1,000,000    
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) | shares           1,500,000    
Subscription Agreement                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Sale of stock, number of shares issued in transaction (in shares) | shares 1,100,000              
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          
At-The-Market Offering                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Sale of stock, number of shares issued in transaction (in shares) | shares   1,100,000 0          
Sale of stock, price per share (in dollars per share) | $ / shares   $ 8.22            
Aggregate gross sales price               $ 150,000,000
Sale of stock, consideration received on transaction, gross   $ 9,100,000            
Sale of stock, amount remaining available for sale of shares     $ 140,900,000          
2023 Equity Inducement Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock available for future awards (in shares) | shares     4,000,000.0          
Common stock, capital shares reserved for future issuance (in shares) | shares     5,000,000.0       5,000,000.0  
Employee Stock Option                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Cash received from option exercises     $ 300,000 $ 0 $ 500,000      
Weighted average grant date fair value of options granted (in dollars per share) | $ / shares     $ 1.80 $ 5.35 $ 17.85      
Total intrinsic value of options exercised     $ 0 $ 0 $ 300,000      
Unrecognized compensation cost related to stock options     $ 5,500,000          
Weighted average period expected to be recognized related to unvested equity awards     2 years          
Employee Stock Option | 2006 Stock Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock authorized for issuance under the plan (in shares) | shares     31,200,000          
Common stock available for future awards (in shares) | shares     6,700,000          
Exercise price of option as percentage of fair market value at grant date, minimum     100.00%          
Contractual life of awards     7 years          
Options, exercises in period (in shares) | shares     100,000          
Stock options granted (in shares) | shares     5,000,000.0          
Restricted Stock Units (RSUs)                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total fair value of awards vested     $ 21,600,000 31,800,000 30,900,000      
Share-based payment arrangement, nonvested award, excluding option, cost not yet recognized, amount     $ 5,600,000          
Weighted average period expected to be recognized related to unvested equity awards     1 year 1 month 6 days          
Performance Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award performance period     3 years          
Total fair value of awards vested     $ 0 $ 2,400,000 $ 2,500,000      
Share-based payment arrangement, nonvested award, excluding option, cost not yet recognized, amount     $ 500,000          
Weighted average period expected to be recognized related to unvested equity awards     1 year          
Performance Stock Units | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Target payout percentage     50.00%          
Performance Stock Units | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Target payout percentage     200.00%          
Long-Term Incentive Award                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Liability classified awards granted     $ 8,000,000.0          
Award performance period     5 years          
Performance Stock Option                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award performance period     5 years          
Contractual life of awards     7 years          
Options, exercises in period (in shares) | shares     0 0 0      
Weighted average grant date fair value of options granted (in dollars per share) | $ / shares     $ 1.13          
Stock options granted (in shares) | shares     800,000 0 0      
Unrecognized compensation cost related to stock options     $ 500,000          
Weighted average period expected to be recognized related to unvested equity awards     1 year 7 months 6 days          
Performance Stock Option | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period     1 year