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Document and Entity Information
Dec. 30, 2021
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001527753
Document Type 8-K
Document Period End Date Dec. 30, 2021
Entity Registrant Name Personalis, Inc.
Entity Incorporation State Country Code DE
Entity File Number 001-38943
Entity Tax Identification Number 27-5411038
Entity Address, Address Line One 1330 O’Brien Drive
Entity Address, City or Town Menlo Park
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94025
City Area Code (650)
Local Phone Number 752-1300
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $0.0001 par value per share
Trading Symbol PSNL
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Entity Ex Transition Period true