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Trade receivables (Tables) | 9 Months Ended
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Sep. 30, 2021
Trade receivables |
Schedule of activity in the allowance for expected credit losses | ​
​ | ​ | ​ | ​
Balance, December 31, 2020 |  | $ | (5,467)
Current period provision |  | ​ | (392)
Write-offs charged against the allowance |  | ​ | 1,721
Balance, September 30, 2021 | ​ | $ | (4,138)

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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=121599337&loc=SL82919249-210447 + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration