Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Nov. 30, 2023	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Disaggregation of Revenue [Line Items]
Revenue from contract with customers excluding assessed tax		$ 314,635	$ 165,969	$ 570,372	$ 311,789
Contract with customer liability amount of revenue recognized that was included in the opening balance				50,400	39,500
Accounts Receivable [Member]
Disaggregation of Revenue [Line Items]
Contract with customer receivable after allowance for credit loss current		3,100		3,100		$ 4,100
Long-Term Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation		390,500		390,500
Commercialization and Reference Laboratory Agreement Member With Personalis Inc [Member]
Disaggregation of Revenue [Line Items]
Term of agreement	3 years
Personalis Inc [Member] | Commercialization and Reference Laboratory Agreement Member With Personalis Inc [Member]
Disaggregation of Revenue [Line Items]
Aggregate milestone amount payable	$ 12,000
Cumulative amount paid		11,000		11,000
Contract with customer assets net current		$ 4,500		$ 4,500		$ 3,000
Personalis Inc [Member] | Commercialization and Reference Laboratory Agreement [Member]
Disaggregation of Revenue [Line Items]
Class Of Warrant Share Issued		9,218,800		9,218,800
One Year [Member] | Long-Term Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage		45.00%		45.00%
Two Year [Member] | Long-Term Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage		34.00%		34.00%
Three Year [Member] | Long-Term Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage		21.00%		21.00%
Genomics Product [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers excluding assessed tax		$ 241,800	112,300	$ 435,600	214,900
Genomics Product [Member] | Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers excluding assessed tax		20,100	10,600	32,400	19,800
Clinical Order [Member] | Third-Party Payor [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers excluding assessed tax		221,700	101,700	403,200	195,100
Insights Product [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers excluding assessed tax		57,200	40,700	106,700	72,000
Trials Product [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers excluding assessed tax		9,800	10,500	19,500	21,800
Data And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers excluding assessed tax		$ 72,800	$ 53,600	$ 134,700	$ 96,900