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Intangible Assets - Additional Information (Detail)
¥ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
CNY (¥)
Sep. 30, 2025
USD ($)
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]              
Finite-lived intangible assets, Weighted average amortization period         7 years 2 months 12 days 7 years 2 months 12 days 4 years
Amortization of intangible assets $ 170,000 $ 10,000 $ 404,000 $ 26,000      
Etorel IP Rights              
Finite-Lived Intangible Assets [Line Items]              
Total consideration of intangible assets         ¥ 35.0 $ 4,900,000