| Cover | Jul. 12, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jul. 12, 2021 |
| Entity Registrant Name | Acutus Medical, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39430 |
| Entity Tax Identification Number | 45-1306615 |
| Entity Address, Address Line One | 2210 Faraday Ave. |
| Entity Address, Address Line Two | Suite 100 |
| Entity Address, City or Town | Carlsbad |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92008 |
| City Area Code | 442 |
| Local Phone Number | 232-6080 |
| 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 $0.001 |
| Trading Symbol | AFIB |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Central Index Key | 0001522860 |
| Amendment Flag | false |
