Share-based compensation - Share Options (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Additional Information
Total share-based compensation expense	$ 8,193	$ 5,673	$ 17,235	$ 15,871
Stock option
Number of Shares
Outstanding number of shares at beginning			5,898,888
Granted			1,571,065
Exercised			(13,266)
Forfeited			(149,760)
Outstanding number of shares at end	7,306,927		7,306,927		5,898,888
Number of shares, vested and expected to vest	7,306,927		7,306,927
Number of shares, options exercisable	4,080,929		4,080,929
Weighted Average Exercise Price
Weighted average exercise price at beginning			$ 22.45
Granted			27.96
Exercised			12.38
Forfeited			29.46
Weighted average exercise price at ending	$ 23.51		23.51		$ 22.45
Weighted average exercise price, vested and expected to vest	23.51		23.51
Weighted average exercise price, options exercisable	$ 17.76		$ 17.76
Weighted Average Contractual Term
Weighted average contractual term, outstanding			7 years 3 months 29 days		7 years 7 months 20 days
Weighted average contractual term, vested and expected to vest			7 years 3 months 29 days
Weighted average contractual term ,options exercisable			6 years 1 month 13 days
Aggregate Intrinsic Value
Aggregate intrinsic value outstanding	$ 53,311		$ 53,311		$ 71,002
Aggregate intrinsic value, vested and expected to vest	53,311		53,311
Aggregate intrinsic value, options exercisable	45,968		$ 45,968
Additional Information
Granted			$ 20.45	$ 35.32
Exercised	100	200	$ 200	$ 1,200
Total share-based compensation expense	$ 6,800	$ 5,000	$ 14,200	$ 12,400