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Fair Value Measurements, Cash Equivalents and Marketable Securities - Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
Nov. 30, 2023
Jul. 31, 2022
May 31, 2018
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Realized gain (loss) on marketable debt securities       $ 0 $ 0 $ 0
Recognition of credit losses       0 0 0
Lunit Inc.            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Number of shares issued for each share of each existing share (in shares) 1          
SoftBank            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Threshold percentage of fair value that is no less than internal rate of return (as a percent)     20.00%      
Fair value, measurements, recurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Initial fair value of contingent consideration at acquisition date       6,050,000 6,540,000  
Level 1 | Fair value, measurements, recurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Initial fair value of contingent consideration at acquisition date       0 0  
Level 3 | Fair value, measurements, recurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Initial fair value of contingent consideration at acquisition date       6,050,000 6,540,000  
Contingent consideration liability, noncurrent       $ 2,100,000 5,000,000.0  
Lunit Inc.            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Lock up period (in years)   2 years        
Unrealized (loss) gain on marketable equity securities         79,700,000 $ (7,800,000)
Lunit Inc. | Level 1 | Fair value, measurements, recurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Short-term marketable equity securities         $ 98,000,000.0  
Guardant Health AMEA, Inc | SoftBank            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Redeemable noncontrolling interest, redemption value     $ 41,000,000