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Receivable and Allowance for Credit Losses (Tables) | 6 Months Ended
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Jun. 30, 2021
Receivable and Allowance for Credit Losses |
Schedule of allowances for credit losses related to trade receivables | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
​ | ​ | 2021 | ​ | 2020 | ​ | 2021 | ​ | 2020 | ​
​ | ​ | (in thousands) | ​
Balance, beginning of period | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 818 | ​
Provision for credit losses | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​
Charge-offs | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (818) | ​
Recoveries | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​
Balance, end of period | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​

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