Segment Information - Reconciliations of segment result to consolidate results (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 24,024	$ 19,346
Segment loss	(57,798)	(36,153)
Unallocated corporate expenses:
General and administrative expenses	19,680	12,098
Loss from operations	(57,798)	(36,153)
Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	24,024	19,346
Segment loss	(39,083)	(25,170)
Unallocated corporate expenses:
Operations and technology	(4,550)	(3,220)
General and administrative expenses	(14,165)	(7,763)
Loss from operations	(39,083)	(25,170)
North America Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	20,764	15,515
North America Segment [Member] | Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment loss	(32,072)	(19,298)
Unallocated corporate expenses:
Loss from operations	(32,072)	(19,298)
Europe Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	3,260	3,831
Europe Segment [Member] | Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment loss	(7,011)	(5,872)
Unallocated corporate expenses:
Loss from operations	$ (7,011)	$ (5,872)