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Document And Entity Information - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Feb. 22, 2024
Jun. 30, 2023
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2023    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Registrant Name Personalis, Inc.    
Entity Central Index Key 0001527753    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Public Float     $ 90,600,000
Entity Common Stock, Shares Outstanding   50,503,889  
Entity Current Reporting Status Yes    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity File Number 001-38943    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 27-5411038    
Entity Address, Address Line One 6600 Dumbarton Circle    
Entity Address, City or Town Fremont    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94555    
City Area Code 650    
Local Phone Number 752-1300    
Entity Interactive Data Current Yes    
Document Annual Report true    
Document Transition Report false    
Auditor Firm ID 243    
Auditor Name BDO USA, P.C.    
Auditor Location San Jose, California    
Title of 12(b) Security Common Stock, par value $0.0001    
Trading Symbol PSNL    
Security Exchange Name NASDAQ    
Documents Incorporated by Reference

Portions of the Registrant's definitive proxy statement relating to its 2024 annual meeting of shareholders are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. The Registrant's definitive proxy statement will be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates.

    
DELOITTE & TOUCHE LLP      
Document Information [Line Items]      
Auditor Firm ID 34    
Auditor Name DELOITTE & TOUCHE LLP    
Auditor Location Austin, Texas