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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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