Accounts receivable - Summary Of Accounts Receivable Allowance For Credit Losses (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Credit Loss Abstract
Beginning balance	$ 1,118
Charges to provision for credit losses	445	$ (182)
Write-off of uncollectible receivables	(290)
Ending Balance	$ 1,273