| Document and Entity Information | Jan. 05, 2024 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001990550 |
| Document Type | 8-K |
| Document Period End Date | Jan. 05, 2024 |
| Entity Registrant Name | Ambrx Biopharma, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 000-56600 |
| Entity Tax Identification Number | 93-2892120 |
| 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 | false |
| Soliciting Material | true |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.0001 Par Value Per Share |
| Trading Symbol | AMAM |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | true |
