Document And Entity Information - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2024 |
Feb. 21, 2025 |
Jun. 28, 2024 |
|
| Cover [Abstract] | |||
| Document Type | 10-K | ||
| Amendment Flag | false | ||
| Document Period End Date | Dec. 31, 2024 | ||
| Document Fiscal Year Focus | 2024 | ||
| 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 | $ 71,600,000 | ||
| Entity Common Stock, Shares Outstanding | 88,263,269 | ||
| 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 2025 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. |
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| Auditor Opinion [Text Block] | Opinion on the Consolidated Financial Statements We have audited the accompanying consolidated balance sheets of Personalis, Inc. and subsidiaries (the Company) as of December 31, 2024 and 2023, the related consolidated statements of operations, comprehensive loss, stockholders’ equity, and cash flows for each of the years then ended, and the related notes (collectively referred to as the consolidated financial statements). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the years then, in conformity with accounting principles generally accepted in the United States of America. |