| Document and Entity Information | Sep. 18, 2023 |
| Document Type | 8-K |
| Document Period End Date | Sep. 18, 2023 |
| Entity Registrant Name | Ambrx Biopharma Inc. |
| Entity Incorporation, State or Country Code | E9 |
| Securities Act File Number | 001-40505 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Address, Address Line One | 10975 North Torrey Pines Road |
| Entity Address, City or Town | La Jolla |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92037 |
| City Area Code | 858 |
| Local Phone Number | 875-2400 |
| Written Communications | true |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | true |
| Amendment Flag | false |
| Entity Central Index Key | 0001836056 |
| Ordinary Shares, Par Value US $0.0001 Per Share [Member] | |
| Title of 12(b) Security | Ordinary shares, par value US $0.0001 per share |
| Security Exchange Name | NASDAQ |
| No Trading Symbol Flag | true |
| American Depositary Shares, Each Representing Seven Ordinary Shares, Par Value US $0.0001 Per Share [Member] | |
| Title of 12(b) Security | American Depositary Shares, each representing seven ordinary shares, par value US $0.0001 per share |
| Security Exchange Name | NASDAQ |
| Trading Symbol | AMAM |
