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v3.21.2

Related Party Transactions - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2015 | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |  |  |  |
Research and development expense | $ 14,521 | $ 13,968 | $ 41,427 | $ 38,725 |  |
Accrued expenses | 13,963 |  | 13,963 |  |  | $ 16,589
M.D. Anderson Cancer Center |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Due from Related Parties, Current | 1,100 |  | 1,100 |  |  | 4,700
Accrued expenses | 2,100 |  | 2,100 |  |  | $ 1,400
MD Anderson License and the Research and Development Agreement [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Cash resources on hand | 0 |  | 0 |  |  |
License Agreement | M.D. Anderson Cancer Center |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Issuance of common stock in licensing agreement (in shares) |  |  |  |  | 11,722,163 |
Research and development expense |  |  |  |  | $ 67,300 |
Cooperative Research and Development Agreement | M.D. Anderson Cancer Center |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Research and development service agreement aggregate payments |  |  | 41,900 |  |  |
Vineti Inc [Member] | Collaborative Arrangement [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related Party Transaction Expenses From Transactions With Related Party Advisory Fees | $ 100 |  | 400 |  |  |
Eden Biocell [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Payments to Fund Long-term Loans to Related Parties |  |  | $ 10,000 |  |  |

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