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Related Party Transactions (Details)	1 Months Ended				3 Months Ended		9 Months Ended
	Feb. 28, 2023 USD ($) ft²	Jul. 31, 2022 ft²	Dec. 31, 2018 ft²	Aug. 31, 2018	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Related Party Transaction [Line Items]
Collaboration revenue, related party (less than)					$ 43,000	$ 49,000	$ 139,000	$ 196,000
Operating lease right-of-use asset					78,643,000		78,643,000		$ 83,592,000
Operating lease liability					96,680,000		96,680,000		101,124,000
Base rent and security deposit, payment	$ 200,000
Total estimated base rent	$ 2,900,000
Allogene Overland, Allogene Overland BioPharm (HK) Limited
Related Party Transaction [Line Items]
Collaboration revenue, related party (less than)					100,000	100,000	100,000	200,000
Reduction to research and development expense					0	300,000	100,000	600,000
Related Party | Allogene Overland, Allogene Overland BioPharm (HK) Limited
Related Party Transaction [Line Items]
Net cost recoveries					0	300,000		600,000
Related Party | Sublease Agreement | Bellco
Related Party Transaction [Line Items]
Area of office space (in square feet) | ft²	2,030	737	1,293
Sublease, term of contract (in years)	115 months		3 years
Operating lease right-of-use asset					100,000		100,000		200,000
Operating lease liability					100,000		100,000		$ 200,000
Related Party | Consulting Agreements | Bellco
Related Party Transaction [Line Items]
Cost of revenue					300,000	200,000	700,000	600,000
Related Party | Consulting Agreements | Two River
Related Party Transaction [Line Items]
Cost of revenue					$ 100,000	$ 100,000	300,000	$ 600,000
Related Party | Consulting Agreements | Payments Commencing January 2022 | Bellco
Related Party Transaction [Line Items]
Monthly payments in arrears							$ 40,217
Related Party | Consulting Agreements | Maximum | Bellco
Related Party Transaction [Line Items]
Related party transaction compensation percentage				60.00%

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