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v3.21.2

License and Collaborations - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
License and Collaborations [Line Items] |  |  |  |  |  |  |  |
Stock shares issued during the period value |  |  |  | $ 48,411 | $ 7 |  |  |
Ares Agreement [Member] | Ares Trading S A [Member] |  |  |  |  |  |  |  |
License and Collaborations [Line Items] |  |  |  |  |  |  |  |
Milestone payments paid |  |  |  |  |  |  | $ 25,000 |
Related party transaction, expenses from transactions with related party |  |  | $ 539 |  |  | $ 1,256 |  |
Payment for royalties on a licensed product, Term |  |  |  |  |  | 2 years |  |
Ares Agreement [Member] | Ares Trading S A [Member] | Research and Development Expense [Member] |  |  |  |  |  |  |  |
License and Collaborations [Line Items] |  |  |  |  |  |  |  |
Non-refundable license issue fee |  |  |  |  |  |  | 13,121 |
Milestone payments recorded to research and development expense |  |  |  |  |  |  | 25,000 |
Ares Agreement [Member] | Ares Trading S A [Member] | Achievement Of Specified BLA Filing Or Regulatory Approval Milestones [Member] |  |  |  |  |  |  |  |
License and Collaborations [Line Items] |  |  |  |  |  |  |  |
Milestone payments payable |  |  |  |  |  |  | $ 176,500 |
Ares Agreement [Member] | Ares Trading S A [Member] | Achievement Of Specified Commercial Milestones [Member] |  |  |  |  |  |  |  |
License and Collaborations [Line Items] |  |  |  |  |  |  |  |
Milestone payments payable |  | $ 515,000 |  |  |  |  |  | $ 515,000
Series C [Member] |  |  |  |  |  |  |  |
License and Collaborations [Line Items] |  |  |  |  |  |  |  |
Temporary equity issue price per share | $ 0.5918 |  |  |  |  |  |  |
Series C [Member] | Ares Agreement [Member] | Ares Trading S A [Member] |  |  |  |  |  |  |  |
License and Collaborations [Line Items] |  |  |  |  |  |  |  |
Temporary equity stock shares issued during the period shares | 22,171,553 |  |  |  |  |  |  |
Temporary equity issue price per share | $ 0.5918 |  |  |  |  |  |  |
Temporary equity shares issued during the period value | $ 13,121 |  |  |  |  |  |  |
Yale University [Member] |  |  |  |  |  |  |  |
License and Collaborations [Line Items] |  |  |  |  |  |  |  |
Stock shares issued during the period shares |  | 264,301 |  |  |  |  |  |
Reimbursement for patent related expenses |  | $ 45 |  |  |  |  |  |
Yale University [Member] | Portion at Fair Value Measurement [Member] |  |  |  |  |  |  |  |
License and Collaborations [Line Items] |  |  |  |  |  |  |  |
Stock shares issued during the period value |  |  |  |  |  |  |  | $ 100
PNAI [Member] | Yale License Agreement [Member] |  |  |  |  |  |  |  |
License and Collaborations [Line Items] |  |  |  |  |  |  |  |
Initial fee paid as consideration |  | $ 37 |  |  |  |  |  |
PNAI [Member] | Yale License Agreement [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
License and Collaborations [Line Items] |  |  |  |  |  |  |  |
Percentage of common stock issuable on a fully diluted and converted basis |  | 5.00% |  |  |  |  |  | 5.00%

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