Net loss per share attributable to common stockholders - Antidilutive shares (Details) - shares	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Amounts excluded from computation of diluted net loss per share	6,592,555	31,672,608
Series A Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Amounts excluded from computation of diluted net loss per share		2,151,641
Series B Redeemable Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Amounts excluded from computation of diluted net loss per share		5,886,405
Series C Redeemable Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Amounts excluded from computation of diluted net loss per share		11,473,110
Series D Redeemable Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Amounts excluded from computation of diluted net loss per share		7,034,423
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Amounts excluded from computation of diluted net loss per share	6,296,781	4,947,296
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Amounts excluded from computation of diluted net loss per share	137,500
Performance-based stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Amounts excluded from computation of diluted net loss per share		21,459
Series D Warrant
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Amounts excluded from computation of diluted net loss per share		158,274
Warrant to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Amounts excluded from computation of diluted net loss per share	158,274