Property and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 8,679	$ 9,767
Accumulated depreciation and amortization	(5,624)	(4,785)
Property and equipment, net	3,055	4,982	$ 4,466
Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	2,843	2,653
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	333	503
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	625	434
Internal-use Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	4,049	4,807
Other
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 829	$ 1,370