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Allowance for credit losses (Tables) | 9 Months Ended
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Sep. 30, 2021
Allowance for credit losses |
Schedule change in the allowance for credit losses | ​
​ | ​ | ​ | ​
in thousands | ​ | ​ | ​
Balance at December 31, 2020 | ​ | $ | 4,135
Provision | ​ | ​ | 771
Write-offs | ​ | ​ | (2,470)
Net foreign currency translation | ​ | ​ | (10)
Balance at September 30, 2021 | ​ | $ | 2,426

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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Balance Type: | na
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- References No definition available. + Details
Name: | us-gaap_CreditLossAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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