Net loss per share attributable to common stockholders - Anti-dilutive Securities (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Redeemable Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	0	46,266,256	0	46,033,714
Redeemable convertible preferred stock warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	0	307,211	0	307,211
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	10,785,909	6,038,919	10,139,442	4,677,249
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	68,175	0	48,589	0
Unvested restricted stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	2,123,409	2,554,598	2,296,359	2,138,146