| Cover | Nov. 15, 2021 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 15, 2021 |
| Entity File Number | 001-38762 |
| Entity Registrant Name | BiomX Inc. |
| Entity Central Index Key | 0001739174 |
| Entity Tax Identification Number | 82-3364020 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 22 Einstein St. |
| Entity Address, Address Line Two | Floor 5 |
| Entity Address, City or Town | Ness Ziona |
| Entity Address, Country | IL |
| Entity Address, Postal Zip Code | 7414003 |
| City Area Code | +972 |
| Local Phone Number | 723942377 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | true |
| Units, each consisting of one share of Common Stock, $0.0001 par value, and one Warrant entitling the holder to receive one half share of Common Stock | |
| Title of 12(b) Security | Units, each consisting of one share of Common Stock, $0.0001 par value |
| Trading Symbol | PHGE.U |
| Security Exchange Name | NYSE |
| Shares of Common Stock, $0.0001 par value | |
| Title of 12(b) Security | Shares of Common Stock, $0.0001 par value |
| Trading Symbol | PHGE |
| Security Exchange Name | NYSE |
| Warrants, each exercisable for one-half of a share of common stock, $0.0001 par value, at an exercise price of $11.50 per share | |
| Title of 12(b) Security | Warrants, each exercisable for one-half of a share of common stock, $0.0001 par value |
| Trading Symbol | PHGE.WS |
| Security Exchange Name | NYSE |
