Cover Page - shares	3 Months Ended
	Mar. 31, 2022	May 09, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2022
Document Transition Report	false
Entity File Number	001-39430
Entity Registrant Name	ACUTUS MEDICAL, INC.
Entity Incorporation, State or Country Code	DE
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
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	AFIB
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		28,336,285
Amendment Flag	false
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001522860
Document Fiscal Year Focus	2022
Current Fiscal Year End Date	--12-31