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Related Party Transactions (Detail) - Inivata Limited - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
May 22, 2021
Strategic Alliance With Inivata Limited      
Related Party Transaction [Line Items]      
Payments to related party $ 0.4 $ 0.8  
Line of Credit      
Related Party Transaction [Line Items]      
Line of credit facility maximum borrowing capacity     $ 15.0