Leases - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended	14 Months Ended
	Dec. 31, 2023	Sep. 30, 2024	Aug. 01, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 1,617			$ 5,769
Operating lease liabilities	70			3,501
Impairment of right-of-use asset	384
Prepaid Expenses and Other Current Assets [Member]
Lessee, Lease, Description [Line Items]
Security deposits	400
Other Assets [Member]
Lessee, Lease, Description [Line Items]
Security deposits				$ 500
Restructuring and Other Charges [Member]
Lessee, Lease, Description [Line Items]
Impairment of right-of-use asset	$ 400
Cambridge, Massachusetts [Member]
Lessee, Lease, Description [Line Items]
Operating lease expiration period	2024-09
Cambridge, Massachusetts [Member] | Scenario Forecast [Member]
Lessee, Lease, Description [Line Items]
Subleased a portion of office space		$ 300
Evansville [Member]
Lessee, Lease, Description [Line Items]
Operating lease expiration period	2030-08
Lessee, Operating Lease, Term of Contract	10 years
Operating lease right-of-use assets			$ 1,100
Operating lease liabilities			$ 1,100
Austin, Texas [Member]
Lessee, Lease, Description [Line Items]
Operating lease expiration period	2025-04