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Collaboration Agreement - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Jan. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 28, 2023
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Contract liability revenue recognized |  |  | $ 26,030,000 | $ 14,957,000 | $ 92,670,000 | $ 47,171,000 |
Contract with customer, performance obligation satisfied in previous period |  |  | 0 |  | 0 |  |
Unrecognized revenue |  |  | 63,600,000 |  | 63,600,000 |  |
Anito-cel |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Clinical milestone achieved |  |  | 68,300,000 |  | 68,300,000 |  |
Anito-cel Next Gen Non-autologous | Maximum |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Potential payments of commercial milestone |  |  | 507,500,000 |  | 507,500,000 |  |
Potential payments of clinical milestone |  |  | 598,300,000 |  | 598,300,000 |  |
Potential payments of regulatory milestone |  |  | $ 935,000,000 |  | $ 935,000,000 |  |
Kite Collaboration Agreement |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Non-refundable upfront payment received |  | $ 225,000,000 |  |  |  |  |
Increase in deemed premium on shares sold |  |  |  |  |  |  | $ 15,600,000
Kite Collaboration Agreement and Amendment | United States |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Percentage of out-of-pocket development costs for co-promote products |  |  | 40.00% |  | 40.00% |  |
Kite Collaboration Agreement and Amendment | Kite Pharma, Inc. | Outside United States |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Percentage of out-of-pocket development costs for co-promote products |  |  | 60.00% |  | 60.00% |  |
Amended Kite Collaboration Agreement |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Non-refundable upfront payment received | $ 85,000,000 |  |  |  |  |  |
Gilead Common Stock Purchase Agreement |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Shares purchased |  |  | 3,478,261 |  | 3,478,261 |  |
Shares issued, price per share |  |  | $ 28.75 |  | $ 28.75 |  |
Reduction of deemed discount on shares sold |  | 15,300,000 |  |  |  |  |
Gilead Common Stock Purchase Agreement | Gilead |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of private placement |  | $ 100,000,000 |  |  |  |  |
Second Gilead Common Stock Purchase Agreement |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Shares purchased | 3,242,542 |  | 3,242,542 |  | 3,242,542 |  |
Shares issued, price per share | $ 61.68 |  | $ 61.68 |  | $ 61.68 |  |
Increase in deemed premium on shares sold | $ 15,600,000 |  |  |  |  |  |
Second Gilead Common Stock Purchase Agreement | Gilead |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of private placement | $ 200,000,000 |  |  |  |  |  |

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