Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) Segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019	Feb. 28, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Off-balance sheet concentrations of credit risk, description	The Company has no off-balance sheet concentrations of credit risk, such as foreign currency exchange contracts, option contracts, or other hedging arrangements.
Goodwill	$ 140,627,000	$ 140,627,000
Amortization of intangible asset	0
Impairments of intangible asset	$ 0
Expected dividend yield	0.00%	0.00%	0.00%
Number of operating segment | Segment	1
Allowance for losses on available-for-sale debt securities	$ 0
ASU 2016-13
Summary Of Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2021
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
Convertible Preferred Stock
Summary Of Significant Accounting Policies [Line Items]
Dividends declared	$ 0
Cobalt Biomedicine Inc
Summary Of Significant Accounting Policies [Line Items]
Goodwill				$ 140,627,000
Acquisition Agreement | Cobalt Biomedicine Inc
Summary Of Significant Accounting Policies [Line Items]
Goodwill	140,600,000			$ 140,600,000
Impairments of goodwill	$ 0
Minimum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life	3 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life	5 years