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Significant Service Providers (Details) - Service Provider Concentration Risk - Revenue	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Ten Largest Service Providers
Concentration Risk [Line Items]
Concentration risk percentage	52.00%	57.00%	52.00%	58.00%
Minimum | Service Provider B
Concentration Risk [Line Items]
Concentration risk percentage	15.00%	15.00%	15.00%	15.00%
Maximum | Service Provider B
Concentration Risk [Line Items]
Concentration risk percentage	20.00%	20.00%	20.00%	20.00%

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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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