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Organization and Nature of the Business - Additional Information (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 15, 2020 | Sep. 15, 2020 | Feb. 28, 2021 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Entity incorporation date |  |  |  | Nov. 30, 2014 |
Entity date of merger |  |  |  | Apr. 28, 2020 |
Equity method investment, Ownership percentage |  |  |  | 25.00% |
Reverse stock split | 1-for-7 | 1-for-7 |  |  |
Exchange ratio |  | 0.1240 |  |  |
Common stock, shares outstanding | shares |  |  |  | 31,955,050 | 19,677,249
Accumulated deficit |  |  |  | $ (152,511) | $ (106,325)
Adicet Therapeutics [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, Ownership percentage |  |  |  | 75.00% |
Common stock, shares outstanding | shares |  |  |  | 19,589,828 |
Accumulated deficit |  |  |  | $ 152,500 |
Initial Public Offering |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Number of common stock shares sold | shares |  |  | 10,575,513 |  |
Issuance price per shares | $ / shares |  |  | $ 13.00 |  |
Underwriting discounts and commissions and other offering expenses |  |  | $ 137,500 |  |
Net proceeds received from offering |  |  | $ 15,000 |  |

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