Subsequent Events	12 Months Ended
Dec. 31, 2025
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On February 25, 2026, the Company entered into a new revolving credit facility with BOCOM, which replaced its previous RMB300.0 million (approximately $41.1 million) credit facility that expired in September 2025. The Company entered into a new guarantee contract with BOCOM pursuant to which the Company will provide a maximum-amount guarantee of RMB330.0 million (approximately $47.9 million) for working capital loans of up to RMB300.0 million (approximately $43.6 million) from BOCOM to Zai Lab Shanghai, and Zai Lab Shanghai entered into a working capital loan contract with BOCOM with respect to the RMB300.0 million facility. The new credit facility will be available until February 2, 2029. Each loan term will be up to 12 months, with a maturity date no later than August 2, 2029, and is subject to a floating interest rate, which is subject to adjustment every three months.

Subsequent Events

12 Months Ended

Dec. 31, 2025

On February 25, 2026, the Company entered into a new revolving credit facility with BOCOM, which replaced its previous RMB300.0 million (approximately $41.1 million) credit facility that expired in September 2025. The Company entered into a new guarantee contract with BOCOM pursuant to which the Company will provide a maximum-amount guarantee of RMB330.0 million (approximately $47.9 million) for working capital loans of up to RMB300.0 million (approximately $43.6 million) from BOCOM to Zai Lab Shanghai, and Zai Lab Shanghai entered into a working capital loan contract with BOCOM with respect to the RMB300.0 million facility. The new credit facility will be available until February 2, 2029. Each loan term will be up to 12 months, with a maturity date no later than August 2, 2029, and is subject to a floating interest rate, which is subject to adjustment every three months.