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Summary of Significant Accounting Policies - Significant Estimates Used by Management in Determining Fair Values of Customer Relationships Acquired (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Minimum
Indefinite-lived Intangible Assets [Line Items]
Discount rates	19.00%	20.00%
Customer attrition rates	5.00%	20.00%
Maximum
Indefinite-lived Intangible Assets [Line Items]
Discount rates	24.00%	27.00%
Customer attrition rates	37.00%	33.00%

X

- Definition

Fair Value Inputs, Customer Attrition Rates

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- Definition

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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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