Document and Entity Information - USD ($) $ in Millions	12 Months Ended
Document and Entity Information - USD ($) $ in Millions	Dec. 31, 2025	May 19, 2026	Jun. 30, 2025
Cover [Abstract]
Document Type	10-K/A
Amendment Flag	true
Document Period End Date	Dec. 31, 2025
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2025
Entity Registrant Name	Adicet Bio, Inc
Entity Central Index Key	0001720580
Entity File Number	001-38359
Trading Symbol	ACET
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Public Float			$ 50.5
Entity Common Stock, Shares Outstanding		9,348,236
Document Annual Report	true
Document Transition Report	false
Entity Tax Identification Number	81-3305277
Entity Incorporation, State or Country Code	DE
Security Exchange Name	NASDAQ
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Entity Address, Address Line One	131 Dartmouth Street
Entity Address, Address Line Two	3rd Floor
Entity Address, City or Town	Boston
Entity Address, State or Province	MA
City Area Code	650
Local Phone Number	503-9095
Entity Address, Postal Zip Code	02116
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Documents Incorporated by Reference	Part III of this Annual Report on Form 10-K incorporates by reference certain information from the registrant’s definitive Proxy Statement for its 2026 annual meeting of shareholders, scheduled to be held on June 17, 2026, which the registrant has filed pursuant to Regulation 14A with the Securities and Exchange Commission not later than 120 days after the registrant’s fiscal year end of December 31, 2025. Except with respect to information specifically incorporated by reference in this Form 10-K, the Proxy Statement is not deemed to be filed as part of this Form 10-K.
Amendment Description	This amended report on Form 10-K/A (the “Amendment”) amends the Annual Report on Form 10-K of Adicet Bio, Inc. (the “Company”) for the year ended December 31, 2025, initially filed with the Securities and Exchange Commission (the “SEC”) on March 12, 2026 (the “Original Filing”), for the purpose of updating the disclosure in Item 9A “Controls and Procedures.” The Original Filing inadvertently omitted (a) a statement disclosing the conclusions of the Company’s principal executive and principal financial officers regarding the effectiveness of the Company’s disclosure controls and procedures as of December 31, 2025 and (b) a statement that the disclosure controls and procedures are designed to provide reasonable assurance of achieving their objectives and the conclusions of the principal executive officer and principal financial officer that the controls and procedures are, in fact, effective at the reasonable assurance level. This Amendment corrects such omission and amends and replaces Item 9A “Controls and Procedures” in its entirety. Except as described above, no other changes are being made to the Original Filing, and this Amendment consists only of the facing page, this explanatory note, Item 9A “Controls and Procedures” and the signature page to the Amendment. Further, except as expressly stated, this Amendment does not reflect events occurring after the filing of the Original Filing or modify or update in any way any of the other items or disclosures contained in the Original Filing, including, without limitation, the consolidated financial statements and the related footnotes. Accordingly, this Amendment should be read in conjunction with the Original Filing and the Registrant’s other filings with the SEC subsequent to the filing of the Original Filing. The filing of this Amendment is not an admission that the Original Filing, when filed, included any untrue statement of a material fact or omitted to state a material fact necessary to make a statement not misleading.

Adicet Bio, Inc. 10-K/A