Segment Information and Discontinued Operations - Income (loss) from Discontinued Operations (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 18,960,000	$ 17,161,000	$ 39,723,000	$ 32,677,000
Operating expenses:
Cost of revenue	26,449,000	19,687,000	56,255,000	38,325,000
Operation And Technology	22,555,000	17,499,000	45,359,000	33,071,000
General and administrative	18,497,000	9,071,000	36,522,000	20,193,000
Impairment charges	7,827,000		7,827,000
Restructuring expenses	10,842,000		10,842,000
Loss from operations	(73,151,000)	(29,096,000)	(123,023,000)	(58,912,000)
Interest expense	193,000	1,398,000	217,000	2,792,000
Other expense, net	4,173,000	175,000	6,796,000	97,000
Loss before provision for income taxes	(69,146,000)	(47,678,000)	(116,417,000)	(80,829,000)
Provision for income taxes	(1,000)	39,000	16,000	157,000
Loss from discontinued operations			22,065,000	14,439,000
Europe Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	3,206,000	3,704,000	6,467,000	7,534,000
Operating expenses:
Cost of revenue	4,651,000	6,172,000	9,654,000	11,703,000
General and administrative	1,163,000	1,727,000	2,819,000	2,703,000
Impairment charges	12,807,000	0	12,807,000	0
Restructuring expenses	2,153,000	0	2,153,000	0
Operating Expenses	25,144,000	11,922,000	36,331,000	22,090,000
Loss from operations	(21,938,000)	(8,218,000)	(29,864,000)	(14,556,000)
Interest expense	(14,000)	(13,000)	(28,000)	(25,000)
Gain on deconsolidation	7,853,000	0	7,853,000	0
Other expense, net	0	15,000	0	197,000
Loss before provision for income taxes	(14,099,000)	(8,246,000)	(22,039,000)	(14,384,000)
Provision for income taxes	9,000	(4,000)	26,000	55,000
Loss from discontinued operations	(14,108,000)	(8,242,000)	(22,065,000)	(14,439,000)
Europe Segment [Member] | Segment Reconciling Items [Member]
Operating expenses:
Operation And Technology	$ 4,370,000	$ 4,023,000	$ 8,898,000	$ 7,684,000