v3.26.1
Stockholders' equity - Narrative (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Nov. 14, 2023
Jun. 30, 2026
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2026
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
shares
Feb. 11, 2026
$ / shares
Dec. 31, 2025
$ / shares
shares
Class of Warrant or Right [Line Items]              
Conversion ratio 0.1            
2025 2-Year Warrants              
Class of Warrant or Right [Line Items]              
Number of warrants exercised (in shares)   6,779,910   6,779,910      
Warrants, exercise price (in dollars per share) | $ / shares   $ 6.000   $ 6.000     $ 6.000
Proceeds from warrant exercises | $       $ 40.7      
2025 3-Year Warrants              
Class of Warrant or Right [Line Items]              
Number of warrants exercised (in shares)   662,483   662,483      
Warrants, exercise price (in dollars per share) | $ / shares   $ 4.200   $ 4.200     4.200
Proceeds from warrant exercises | $       $ 2.8      
Class of warrant or right, warrants exercised (in shares)   1,000          
Private Placement Offering Warrants              
Class of Warrant or Right [Line Items]              
Number of warrants exercised (in shares)   10,008,240   10,008,240      
Warrants, exercise price (in dollars per share) | $ / shares   $ 1.0680   $ 1.0680     $ 1.068
Number of securities called by warrants (in shares)   1,000,824   1,000,824      
Number of securities called by each warrant (in shares)   0.1   0.1     0.1
Share price, ten day average (in dollars per share) | $ / shares           $ 45.41  
Common stock issued (in shares)       765,440      
New At-The-Market Offering              
Class of Warrant or Right [Line Items]              
Number of shares issued (in shares)   1,476,538 0 1,476,538 108,072    
Proceeds from issuance of equity | $   $ 35.8 $ 0.0 $ 35.8 $ 0.3    
Shares available for issuance under the plan | $   $ 55.3   $ 55.3