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Goodwill and Intangible Assets - Summary of Goodwill and Intangible Assets (Details) - QL Holdings LLC and Subsidiaries - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill And Intangible Assets [Line Items]
Gross carrying amount	$ 26,567	$ 59,957
Accumulated amortization	(10,217)	(41,205)
Net carrying amount	16,350	18,752	$ 23,985
Goodwill	$ 18,402	18,402	$ 18,402
Technology and Intellectual Property
Goodwill And Intangible Assets [Line Items]
Useful life (months)	60 months
Gross carrying amount		32,027
Accumulated amortization		(32,027)
Customer Relationships
Goodwill And Intangible Assets [Line Items]
Useful life (months)	120 months
Gross carrying amount	$ 25,040	25,040
Accumulated amortization	(9,285)	(7,094)
Net carrying amount	$ 15,755	17,946
Costs to Acquire Third Party Publishers
Goodwill And Intangible Assets [Line Items]
Useful life (months)	24 months
Gross carrying amount		1,363
Accumulated amortization		(1,363)
Non-compete Agreements
Goodwill And Intangible Assets [Line Items]
Useful life (months)	60 months
Gross carrying amount	$ 303	303
Accumulated amortization	(197)	(155)
Net carrying amount	$ 106	148
Domain Names
Goodwill And Intangible Assets [Line Items]
Useful life (months)	60 months
Gross carrying amount	$ 1,224	1,224
Accumulated amortization	(735)	(566)
Net carrying amount	$ 489	$ 658

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