Segment Information - Schedule of Total Net Revenues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 101,764	$ 46,723	$ 41,330	$ 44,846	$ 111,319	$ 74,427	$ 60,805	$ 40,886	$ 234,663	$ 287,437	$ 149,135
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue									166,748	215,601	103,159
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue									25,671	34,509	21,113
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue									34,707	30,244	20,277
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue									$ 7,537	$ 7,083	$ 4,586