Amount of allowance for credit loss on accounts receivable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
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-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
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-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-4

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

Amount of expense for expected credit loss on accounts receivable.

No definition available.

Amount of reversal of expense for expected credit loss on accounts receivable.

No definition available.