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Accounts receivable | 6 Months Ended
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Jun. 30, 2020
Accounts receivable |
Accounts receivable | ​ 6.Accounts receivable The roll-forward of the allowance for credit losses related to accounts receivable for the six months ended June 30, 2020 consists of the following activity: ​
​ | ​ | ​
​ |  | 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
​ The Group did not have any allowance for credit losses for the six months ended June 30, 2019. ​

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- Definition The entire disclosure for accounts receivable, contract receivable, receivable held-for-sale, and nontrade receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -URI http://asc.fasb.org/topic&trid=2196771 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -URI http://asc.fasb.org/topic&trid=82887179 + Details
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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