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Equity Method Investments (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 01, 2019 | Oct. 31, 2021 | Feb. 28, 2021 | Sep. 30, 2023 | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 14, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment |  |  |  | $ 5,365,000 | $ 5,365,000 | $ 12,817,000 |
Notch Therapeutics, Inc. |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Payments to acquire interest in Notch | $ 5,100,000 |  |  |  |  |  |
Transaction cost | $ 100,000 |  |  |  |  |  |
Ownership percentage | 25.00% |  |  |  |  |  |
Payments for additional investment in interest |  | $ 1,800,000 | $ 15,900,000 |  |  |  |
Equity method investment | $ 5,000,000 |  |  |  |  |  |
Equity method investment, impairment |  |  |  | 3,000,000 | 3,000,000 | 0 |
Notch Therapeutics, Inc. | Voting Interest |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership percentage |  | 23.00% | 20.70% |  |  |  |
Allogene Overland |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 49.00%
Equity method investment |  |  |  | 0 | 0 | 0 |
Carrying value |  |  |  | $ 0 | $ 0 | $ 0 | $ 0

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