Stock based compensation - Stock option activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021	Dec. 31, 2020
Shares
Less: unvested early exercised shares	(565,224)	(946,586)
Stock Options
Shares
Outstanding, beginning (in shares)	5,678,604
Granted	2,417,782
Exercised - vested	(203,001)
Forfeited	(169,326)
Outstanding, ending (in shares)	7,724,059	5,678,604
Exercisable	3,186,663
Weighted Average Exercise Price
Outstanding, beginning	$ 5.36
Granted	12.55
Exercised - vested	1.24
Forfeited	6.30
Outstanding, ending	7.63	$ 5.36
Exercisable	$ 3.93
Weighted Average Remaining Contractual Term (years)
Outstanding	8 years 14 days	8 years 4 months 6 days
Exercisable	7 years 6 months 3 days
Weighted average grant date fair value	$ 8.22
Awards that vest upon contingent events	2,417,782
Aggregate Intrinsic Value
Outstanding, beginning	$ 11,595
Outstanding, ending	28,307	$ 11,595
Exercisable	17,362
Time Based Vesting
Weighted Average Remaining Contractual Term (years)
Unrecognized compensation expense	$ 28,936
Unrecognized compensation expense expected to be recognized over a weighted average period	2 years 9 months
Performance Shares
Weighted Average Remaining Contractual Term (years)
Unrecognized compensation expense		$ 227
Performance Shares | Tranche 1.
Shares
Granted			213,624
Weighted Average Remaining Contractual Term (years)
Awards that vest upon contingent events			213,624