Segment Information - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) Segment	Dec. 31, 2023 USD ($)
Segment Reporting Information [Line Items]
Segment reporting, expense information used by CODM, description	The CODM assesses performance for the Company’s single reportable segment and decides how to allocate resources based on the Company’s total operating expenses as reported on the Consolidated Statements of Operations and Comprehensive Loss. The CODM’s review of total operating expenses at the consolidated level is used to monitor the Company’s spending as well as budget versus actual results. As part of the CODM’s review of the segment’s performance, the CODM reviews the Company’s operating expense information. This includes research and development costs as well as general and administrative expenses. Based upon the operating expense information, the CODM can reconcile to net loss as reported on the Consolidated Statements of Operations and Comprehensive Loss, shown in the table below. The significant expense categories are consistent with those presented on the face of the consolidated financial statements, except for the breakout of the early-stage research and development from the late-stage research and development. The CODM does not receive or use any other segmented or disaggregated financial or any significant expense information for decision making purposes.
Number of reportable segment | Segment	1
Fixed assets	$ 2,362	$ 3,259
Aligos-US [Member]
Segment Reporting Information [Line Items]
Fixed assets	2,100	2,900
Aligos-Belgium [Member]
Segment Reporting Information [Line Items]
Fixed assets	$ 200	$ 300