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Disaggregation of Revenue - Summary of Disaggregation of Revenue by Transaction Model (Details) - QL Holdings LLC and Subsidiaries - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 151,548	$ 110,397	$ 394,609	$ 281,857
Open Platform Transactions
Disaggregation of Revenue [Line Items]
Revenue	148,240	108,146	386,224	275,991
Private Platform Transactions
Disaggregation of Revenue [Line Items]
Revenue	$ 3,308	$ 2,251	$ 8,385	$ 5,866

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