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Accounts receivable (Tables) | 6 Months Ended
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Jun. 30, 2020
Accounts receivable |
Schedule of allowance for credit losses related to accounts receivable | ​
​ | ​ | ​
​ |  | Allowance for
​ | ​ | Credit Losses
​ |  | $
Balance as of December 31, 2019 | ​ | —
Current period provision for expected credit losses | ​ | 2
Amounts written-off | ​ | —
Recoveries of amounts previously written-off | ​ | —
Balance as of June 30, 2020 | ​ | 2

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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=119407570&loc=SL82919249-210447 + Details
Name: | us-gaap_AccountsReceivableAllowanceForCreditLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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