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Property and Equipment, net (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Jun. 30, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property and Equipment
Total				$ 32,251	$ 32,645
Accumulated depreciation				(13,529)	(19,964)
Property and equipment, net				18,722	12,681
Depreciation expense				3,700	2,900	$ 3,000
Write-off of property and equipment, net				$ 2,728	3,828	0
Brussels Office | Real Estate Rationalization
Property and Equipment
Write-off of property and equipment, net		$ 600
Minimum
Property and Equipment
Useful life (in years)				3 years
Maximum
Property and Equipment
Useful life (in years)				10 years
Office equipment and software
Property and Equipment
Total				$ 8,574	$ 14,451
Write-off of property and equipment, net			$ 100
Office equipment and software | Minimum
Property and Equipment
Useful life (in years)				3 years	3 years
Office equipment and software | Maximum
Property and Equipment
Useful life (in years)				5 years	5 years
Leasehold improvements
Property and Equipment
Useful life (in years)				10 years	10 years
Total				$ 7,459	$ 9,927
Write-off of property and equipment, net			$ 600
Furniture and fixtures
Property and Equipment
Useful life (in years)				5 years	5 years
Total				$ 3,658	$ 4,260
Capitalized software
Property and Equipment
Useful life (in years)				3 years	3 years
Total				$ 12,560	$ 4,007
Write-off of property and equipment, net	$ 1,500
Cloud Subscription Agreements
Property and Equipment
Depreciation expense directly related to generating revenue				$ 1,100	$ 0	$ 0

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