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Organization and Nature of the Business - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 07, 2025 | Jan. 23, 2024 | Aug. 31, 2022 | Mar. 12, 2021 | Jul. 31, 2025 | Nov. 30, 2022 | Mar. 31, 2026 | Dec. 31, 2025 | Jan. 31, 2024 | Jan. 22, 2024
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity transfer agreement |  |  |  |  | In July 2025, Adicet Therapeutics entered into an equity transfer agreement with the then-stockholders of Shanghai Adicet to acquire 100% equity interests of Shanghai Adicet from its then-stockholders (the Acquisition). |  |  |  |  |
Sale of Stock, Price Per Share | $ 16 |  |  |  |  |  |  |  |  |
Shares were sold at a price |  |  |  |  |  |  |  |  |  | $ 38.3984
Common stock price per share | $ 0.0016 |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0016
Issuance of common stock |  |  |  |  |  |  | 9,597,693 | 9,586,770 |  | 332,812
Estimated offering expenses |  | $ 91,700 |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  |  | $ (634,941) | $ (614,697) |  |
Adicet Therapeutics [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  |  | $ 634,900 |  |  |
Underwriting Agreement |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Discount on underwriters warrant | 6.00% |  |  |  |  |  |  |  |  |
Estimated offering expenses | $ 74,800 |  |  |  |  |  |  |  |  |
2021 Sales Agreement |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate number of shares sold |  |  | 163,233 |  |  |  |  |  |  |
Sale of Stock, Price Per Share |  |  | $ 275.68 |  |  |  |  |  |  |
Sales agent commissions and expenses |  |  |  | $ 43,400 |  |  |  |  |  |
Aggregate net proceed |  |  |  |  |  |  |  |  | $ 19,300 |
Common Stock not sold |  |  |  |  |  | $ 30,000 |  |  |  |
Common stock price per share |  |  | $ 0.0001 |  |  |  |  |  |  |
Additional Common Stock not sold |  |  |  |  |  | 70,000 |  |  |  |
Aggregate gross proceeds |  |  |  |  |  | $ 100,000 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  | 332,813
Common Stock [Member] | Jefferies LLC |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Shares were sold at a price |  |  |  |  |  |  |  |  |  | $ 38.4
Warrants outstanding |  |  |  |  |  |  |  |  |  | 527,833
Issuance of common stock |  |  |  |  |  |  |  |  |  | 1,690,917
Common Stock [Member] | Underwriting Agreement |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of Stock, Price Per Share | $ 15.04 |  |  |  |  |  |  |  |  |
Shares were sold at a price | $ 16 |  |  |  |  |  |  |  |  |
Warrants outstanding | 625,000 |  |  |  |  |  |  |  |  |
Issuance of common stock | 4,375,062 |  |  |  |  |  |  |  |  |
Pre Funded Warrant | Jefferies LLC |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Underwriting agreement to purchase |  |  |  |  |  |  | 30 |  |  |
Discount on underwriters warrant |  |  |  |  |  |  |  |  |  | 6.00%
Purchase price per share |  |  |  |  |  |  |  |  |  | $ 36.0944
Shares were sold at a price |  |  |  |  |  |  |  |  |  | 38.3984
Pre Funded Warrant | Jefferies LLC | Initial Public Offering |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Shares were sold at a price |  |  |  |  |  |  |  |  |  | 0.0016
Pre Funded Warrant | Underwriting Agreement |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Shares were sold at a price | $ 15.9984 |  |  |  |  |  |  |  |  |
Warrants outstanding | 15.03856 |  |  |  |  |  |  |  |  |
Pre Funded Warrant | Underwriting Agreement | Initial Public Offering |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Shares were sold at a price | $ 0.0016 |  |  |  |  |  |  |  |  |
Pre Funded Warrant | Underwriting Agreement | Jefferies LLC |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price per share |  |  |  |  |  |  |  |  |  | $ 36.096
Maximum | 2021 Sales Agreement |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate gross proceeds |  |  |  | $ 75,000 |  |  |  |  |  |

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