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Common Stock Warrants - Additional Information (Details) - $ / shares	Feb. 26, 2024	Mar. 31, 2024	Dec. 31, 2023	Jul. 29, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Replacement of warrants		1,003,191
Pre-Funded Warrants issued to purchase aggregate number of shares of common stock		58,803,126	44,754,853
Apexigen, Inc.
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Replacement of warrants		5,815,613
Pre-Funded Warrants
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Warrants outstanding		1,611,215
Purchase price per warrant	$ 4.779
Maximum [Member] \| Pre-Funded Warrants
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Warrants exercise price per share	$ 0.001
Warrant One
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Warrants outstanding		344,259
Warrants exercise price per share		$ 8.12
Warrant Two
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Warrants outstanding		17,212
Warrants exercise price per share		$ 10.14
Warrant Three
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Warrants outstanding		641,720
Warrants exercise price per share		$ 66.67		$ 66.67
Common Stock \| Pre-Funded Warrants
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Pre-Funded Warrants issued to purchase aggregate number of shares of common stock	1,611,215