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Term of agreement.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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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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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right to consideration is unconditional, classified as current.

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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.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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Percentage of remaining performance obligation to total remaining performance obligation not recognized as revenue.

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Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Nov. 30, 2023	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Disaggregation of Revenue [Line Items]
Revenue from contract with customers excluding assessed tax		$ 411,537	$ 334,206	$ 1,142,139	$ 904,578
Contract with customer liability amount of revenue recognized that was included in the opening balance				64,800	67,000
Location, Statement of Financial Position, Balance [Axis]: us-gaap:AccountsReceivableNetCurrent
Disaggregation of Revenue [Line Items]
Contract with customer receivable after allowance for credit loss current		40,500		40,500		$ 8,100
Long-Term Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation		514,000		514,000
Commercialization and Reference Laboratory Agreement Member With Personalis Inc [Member]
Disaggregation of Revenue [Line Items]
Term of agreement	3 years
Personalis [Member] \| Commercialization and Reference Laboratory Agreement Member With Personalis Inc [Member]
Disaggregation of Revenue [Line Items]
Aggregate milestone amount payable	$ 12,000
Contract with customer assets net current		$ 1,500		$ 1,500		$ 4,700
One Year [Member] \| Long-Term Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage		44.00%		44.00%
Two Year [Member] \| Long-Term Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage		29.00%		29.00%
Three Year [Member] \| Long-Term Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage		14.00%		14.00%
Four and Thereafter [Member] \| Long-Term Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage		13.00%		13.00%
Genomics Product [Member] \| Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers excluding assessed tax		$ 31,000	17,500	$ 77,700	49,900
Clinical Order [Member] \| Third-Party Payor [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers excluding assessed tax		272,500	235,400	776,200	638,600
Insights Product [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers excluding assessed tax		88,900	69,000	237,900	175,700
Trials Product [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers excluding assessed tax		9,600	9,200	28,500	28,700
Next Product [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers excluding assessed tax		$ 9,600	$ 3,200	$ 21,600	$ 11,600