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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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 944
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-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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-Topic 210
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-Topic 310
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Amount of direct write-downs of accounts receivable charged against the allowance.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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Amount of expense related to credit loss from transactions other than loan and lease transactions.

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-Name Accounting Standards Codification
-Section 45
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-Topic 942
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