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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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