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Collaboration Agreements - Additional Information (Details)	1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($)	Aug. 31, 2020 USD ($) Program	Oct. 31, 2018 Program	Jun. 30, 2023 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
2018 Gilead Agreement [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Research term			3 years
Number of licensed product | Program			5
Non-refundable upfront payment received						$ 50,000,000		$ 50,000,000
Amended Gilead Agreement [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Research term		7 years
Number of licensed product | Program		15
Non-refundable upfront payment received						$ 125,000,000
Milestone payments receivable		$ 410,000,000
Temporary equity, par value		125,000,000
Revenue recognized, cumulative catch-up adjustment					$ (11,300,000)
Research extension fee										$ 12,000,000	$ 12,000,000
License fee amount	$ 5,000,000
Contract with customer liability, revenue recognized				$ 5,000,000
Amended Gilead Agreement [Member] | Minimum [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Ownership percentage in common stock						10.00%
Amended Gilead Agreement [Member] | Series B-1 Preferred Stock [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Temporary equity, par value		$ 20,000,000
Gilead Agreement [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Transaction price allocated to performance obligation						$ 199,000,000
Cummulative research extension fee						24,000,000
Short-term deferred revenue						27,100,000			$ 31,800,000
Long-term deferred revenue						70,700,000			$ 92,100,000
Collaboration Revenue [Member] | Gilead Agreement [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Contract with customer liability, revenue recognized						$ 26,100,000	$ 18,400,000

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No definition available.

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- Definition

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No definition available.

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- Definition

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No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 808
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479402/808-10-50-1

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- Definition

Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from contract modification which (increases) decreases obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as current.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Carrying amount of the par value of temporary equity outstanding. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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