Accrued expenses and other current liabilities - Changes to Withholding Tax Reserve (Details) - Historical Tax Withholding Possible Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Loss Contingency Accrual [Roll Forward]
Balance, beginning of period	$ 22,166	$ 20,926	$ 12,540
Amounts charged to expense	(5,130)	2,826	8,386
Net payments and settlements	0	(1,586)	0
Balance, end of period	$ 17,036	$ 22,166	$ 20,926