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Summary of Significant Accounting Policies - Significant Estimates Used by Management in Determining Fair Values of Customer Relationships Acquired (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Minimum
Indefinite-lived Intangible Assets [Line Items]
Discount rates	20.00%	19.00%
Customer attrition rates	23.00%	5.00%
Maximum
Indefinite-lived Intangible Assets [Line Items]
Discount rates	23.00%	24.00%
Customer attrition rates	41.00%	37.00%
Weighted Average
Indefinite-lived Intangible Assets [Line Items]
Discount rates	22.00%	24.00%
Customer attrition rates	29.00%	6.00%

X

- Definition

Fair Value Inputs, Customer Attrition Rates

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- Definition

Fair Value Inputs, Rate Of Return

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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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