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Significant Service Providers (Details) - Service Provider Concentration Risk - Revenue	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Ten Largest Service Providers
Concentration Risk [Line Items]
Concentration risk percentage	48.00%	46.00%	49.00%	48.00%
Minimum | Service Provider A
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	15.00%	10.00%	15.00%
Maximum | Service Provider A
Concentration Risk [Line Items]
Concentration risk percentage	15.00%	20.00%	15.00%	20.00%

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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.

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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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