| Cover | Apr. 05, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Apr. 5, 2021 |
| Entity File Number | 001-38795 |
| Entity Registrant Name | Romeo Power, Inc. |
| Entity Central Index Key | 0001757932 |
| Entity Tax Identification Number | 83-2289787 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 4380 Ayers Avenue |
| Entity Address, City or Town | Vernon |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 90058 |
| City Area Code | 833 |
| Local Phone Number | 467-2237 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, par value $0.0001 per share |
| Trading Symbol | RMO |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | true |
