Summary of significant accounting policies - Trade Receivables, net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 479	$ 480	$ 391	$ 530
Provision	48	37	310	93
Write-offs	(99)	(66)	(281)	(238)
Recoveries of amounts previously written off	34	9	42	75
Balance, end of period	$ 462	$ 460	$ 462	$ 460