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Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Jun. 30, 2024
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term		5 years 6 months
Weighted-average discount rate		6.00%
Cash payments to settle a lease liability reported in cash flows		$ 1,900
Right-of-use assets obtained in exchange for new lease liabilities		2,800
Contract termination fees		2,297		$ 5,015
Real Estate Rationalization
Lessee, Lease, Description [Line Items]
Contract termination fees		$ 621		1,885
Chicago Office | Real Estate Rationalization
Lessee, Lease, Description [Line Items]
Contract termination fees	$ 1,400		$ 1,400
Gain (loss) on rent concession and tenant improvement allowances			300	300
Brussels Office
Lessee, Lease, Description [Line Items]
Term of contract					9 years
Brussels Office | Real Estate Rationalization
Lessee, Lease, Description [Line Items]
Contract termination fees	300		300
Gain (loss) on rent concession and tenant improvement allowances	$ (600)		$ (600)	$ (100)

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Amount of gain (loss) on termination of lease before expiration of lease term.

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