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Accounts Receivable - Concentration of Credit Risk (Details) - Credit Concentration Risk - Accounts receivable, net	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
29 days or less past due
Concentration Risk [Line Items]
Concentration risk, percentage	99.00%	97.00%
59 days or less past due
Concentration Risk [Line Items]
Concentration risk, percentage	99.00%	98.00%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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