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Fair value measurements - Level 3 Fair Value Of Common Stock Warrant Liability (Details) - Warrant
$ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
Unobservable Input Reconciliation [Roll Forward]  
Balance, beginning of period $ 0.0
Issuance of Warrants 13.4
Change in fair value 2.8
Balance, end of period $ 16.2