Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Mar. 28, 2023	Jun. 30, 2022
Document and Entity Information
Document Type	10-K
Document Period End Date	Dec. 31, 2022
Document Annual Report	true
Document Transition Report	false
Entity File Number	001-12584
Entity Registrant Name	THERIVA BIOLOGICS, INC.
Entity Incorporation, State or Country Code	NV
Entity Tax Identification Number	13-3808303
Entity Address, Address Line One	9605 Medical Center Drive, Ste. 270
Entity Address, City or Town	Rockville
Entity Address, Country	MD
Entity Address, Postal Zip Code	20850
City Area Code	301
Local Phone Number	417-4364
Title of 12(b) Security	Common Stock
Trading Symbol	TOVX
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		15,124,061
Entity Central Index Key	0000894158
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Public Float			$ 32.7
ICFR Auditor Attestation Flag	false
Auditor Name	BDO USA, LLP
Auditor Firm ID	243
Auditor Location	Potomac, Maryland