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Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2019
Feb. 14, 2020
Jun. 28, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-38683    
Entity Registrant Name GUARDANT HEALTH, INC.    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001576280    
Current Fiscal Year End Date --12-31    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 45-4139254    
Entity Address, Address Line One 505 Penobscot Dr.    
Entity Address, City or Town Redwood City    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94063    
City Area Code 855    
Local Phone Number 698-8887    
Title of 12(b) Security Common Stock, par value $0.00001    
Trading Symbol GH    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 3.4
Entity Common Stock, Shares Outstanding   94,382,681  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive proxy statement relating to its annual meeting of stockholders to be held in 2020 (the “2020 Annual Meeting”), to be filed with the Securities and Exchange Commission (the “SEC”) within 120 days after the end of the fiscal year to which this Annual Report on Form 10-K relates, are incorporated herein by reference where indicated. Except with respect to information specifically incorporated by reference in this Annual Report on Form 10-K, such proxy statement is not deemed to be filed as part hereof.