Stock-based awards - Textual (Details) - USD ($)		1 Months Ended		12 Months Ended
	Jun. 18, 2019	Jan. 31, 2022	Jun. 30, 2019	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 31, 2023
Share-based awards
Number of shares remained available for grant				13,667,341	14,318,383
Weighted average grant-date fair value per share of stock options granted				$ 28.29	$ 28.76	$ 13.98
Stock options granted ( in shares)				1,720,882
Exercise price				$ 28.29
Stock compensation expense				$ 21,497,000	$ 23,243,000	$ 10,054,000
Total unrecognized compensation cost related to unvested stock-based awards				51,121,000
Total unrecognized compensation cost related to RSU				$ 10,331,000
Weighted average period of recognition for unrecognized compensation cost				2 years 10 months 13 days
Performance Shares
Share-based awards
Stock options granted ( in shares)						610,546
Additional stock options granted (in shares)		248,376
Exercise price		$ 21.7				$ 21.1
Stock compensation expense				$ 10,487,000
Options vesting description				One-third of the options vest upon achievement of each of the milestones.
Description of milestones achieved and deemed vested				In September 2022, two of the three performance-based awards milestones were achieved and were deemed vested
Restricted Stock Units
Share-based awards
Weighted average period of recognition for unrecognized compensation cost				3 years 7 months 9 days
RSU granted (shares)				281,462	129,131
Weighted average grant-date fair value per share of RSUs granted				$ 24.03	$ 42.95
Total grant date fair value of RSU					$ 5,546,000
Restricted Stock Units | Executive and Non-executive Employees
Share-based awards
RSU granted (shares)				281,462
Total grant date fair value of RSU				$ 24,030.00
2018 Stock option and grant plan
Share-based awards
Number of shares of common stock issued	3,071,960
Number of shares remained available for grant	107,635			1,114,189	1,633,173
2019 Stock option and incentive plan
Share-based awards
Number of shares remained available for grant	107,635
Number of shares initially reserved for issuance			2,572,457
Number of additional shares reserved for issuance		1,396,029					1,874,608
Percent of shares reserved and available for issuance automatically increase annually on January 1			4.00%
Percentage of exercise price per share of stock options			100.00%
Percentage of minimum exercise price, holding more than 10% of voting power			110.00%
Stock options vesting period			4 years
2019 Employee stock purchase plan
Share-based awards
Number of shares initially reserved for issuance	273,869
Number of additional shares reserved for issuance		349,007					410,803
Percent of shares reserved and available for issuance automatically increase annually on January 1			1.00%
Number of shares reserved and available for issuance automatically increase annually on January 1 (in shares)			410,803
Maximum | 2019 Stock option and incentive plan
Share-based awards
Term of stock option			10 years