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Accounts receivable - Summary Of Accounts Receivable Allowance For Credit Losses (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Credit Loss Abstract    
Beginning balance $ 1,118  
Charges to provision for credit losses 540 $ (47)
Write-off of uncollectible receivables (307)  
Ending Balance $ 1,351