Net loss per share attributable to common stockholders - Antidilutive shares (Details) - shares	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Amounts excluded from computation of diluted net loss per share	8,307,418	7,562,888
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Amounts excluded from computation of diluted net loss per share	6,319,969	6,381,561
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Amounts excluded from computation of diluted net loss per share	1,987,449	1,181,327