Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2025	Jul. 25, 2025
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2025
Document Quarterly Report	true
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q2
Trading Symbol	BBNX
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-42491
Entity Registrant Name	BETA BIONICS, INC.
Entity Central Index Key	0001674632
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-5386878
Entity Address, Address Line One	11 Hughes
Entity Address, City or Town	Irvine
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92618
City Area Code	949
Local Phone Number	427-7785
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		43,470,125
Title of 12(b) Security	Common Stock, $0.0001 par value per share
Security Exchange Name	NASDAQ