Summary of Significant Accounting Policies - Schedule of Compensating Balance Arrangements (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Cash and Cash Equivalents [Line Items]
Restricted Cash	$ 788	$ 1,032
Restricted cash, current (included within prepaid expenses and other current assets)	0	250
Total restricted cash	788	782
Letter of Credit | Waltham Lease
Cash and Cash Equivalents [Line Items]
Restricted Cash	0	250
Letter of Credit | Vienna Austria Lease
Cash and Cash Equivalents [Line Items]
Restricted Cash	213	211
Letter of Credit | Allston Lease Agreement
Cash and Cash Equivalents [Line Items]
Restricted Cash	$ 575	$ 571