Employee benefit plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, employer contribution amount	$ 1,000	$ 700	$ 500
Maximum
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent (up to)	4.00%