Subsequent Events	12 Months Ended
Dec. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	17. Subsequent Events ATM Program In January 2024, 6,350,000 shares of common stock were issued in a series of sales in accordance with the ATM Program, at an average price of $3.13 per share for aggregate net proceeds of approximately $19.3 million, after deducting sales agent commissions, but before deducting any expenses related to such sales. Underwritten Public Offering On January 22, 2024, Adicet entered into an Underwriting Agreement (the Underwriting Agreement) with Jefferies LLC and Guggenheim Securities, LLC (the Underwriters) related to an underwritten public offering (the Offering) of 27,054,667 shares (the Shares) of common stock of the Company, par value $0.0001 per share (the Common Stock), and, in lieu of Common Stock to an investor, pre-funded warrants (the Pre-Funded Warrants) to purchase 8,445,333 shares of Common Stock (the Warrant Shares). The Shares were sold at a public offering price of $2.40 per share and the Pre-Funded Warrants were sold at a public offering price of $2.3999 per underlying share, which represents the per share public offering price of each share of common stock minus the $0.0001 per share exercise price for each pre-funded warrant. The purchase price paid by the Underwriters to the Company was $2.256 per Share and $2.2559 per Pre-Funded Warrant, representing a discount to the Underwriters of 6.0%. In addition, the Company granted the Underwriters an option exercisable for 30 days from the date of the Underwriting Agreement to purchase, at the public offering price less underwriting discounts and commissions, up to an additional 5,325,000 shares of Common Stock. On January 23, 2024, the Underwriters exercised this option in full. The Company received net proceeds from the Offering, after deducting the underwriting discount and commissions and other estimated offering expenses, of approximately $91.8 million. The Company may receive nominal proceeds, if any, from the exercise of the Pre-Funded Warrants.

Subsequent Events

12 Months Ended

Dec. 31, 2023

17. Subsequent Events

ATM Program

In January 2024, 6,350,000 shares of common stock were issued in a series of sales in accordance with the ATM Program, at an average price of $3.13 per share for aggregate net proceeds of approximately $19.3 million, after deducting sales agent commissions, but before deducting any expenses related to such sales.

Underwritten Public Offering

On January 22, 2024, Adicet entered into an Underwriting Agreement (the Underwriting Agreement) with Jefferies LLC and Guggenheim Securities, LLC (the Underwriters) related to an underwritten public offering (the Offering) of 27,054,667 shares (the Shares) of common stock of the Company, par value $0.0001 per share (the Common Stock), and, in lieu of Common Stock to an investor, pre-funded warrants (the Pre-Funded Warrants) to purchase 8,445,333 shares of Common Stock (the Warrant Shares). The Shares were sold at a public offering price of $2.40 per share and the Pre-Funded Warrants were sold at a public offering price of $2.3999 per underlying share, which represents the per share public offering price of each share of common stock minus the $0.0001 per share exercise price for each pre-funded warrant. The purchase price paid by the

Underwriters to the Company was $2.256 per Share and $2.2559 per Pre-Funded Warrant, representing a discount to the Underwriters of 6.0%. In addition, the Company granted the Underwriters an option exercisable for 30 days from the date of the Underwriting Agreement to purchase, at the public offering price less underwriting discounts and commissions, up to an additional 5,325,000 shares of Common Stock. On January 23, 2024, the Underwriters exercised this option in full. The Company received net proceeds from the Offering, after deducting the underwriting discount and commissions and other estimated offering expenses, of approximately $91.8 million. The Company may receive nominal proceeds, if any, from the exercise of the Pre-Funded Warrants.