| Cover | Jun. 03, 2021 | May 12, 2021 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Document Period End Date | Sep. 1, 2021 | |
| Entity Registrant Name | 1LIFE HEALTHCARE, INC. | |
| Entity Central Index Key | 0001404123 | |
| Amendment Flag | false | |
| Entity Incorporation, State or Country Code | DE | |
| Entity File Number | 001-39203 | |
| Entity Tax Identification Number | 76-0707204 | |
| Entity Address, Address Line One | One Embarcadero Center | |
| Entity Address, Address Line Two | Suite 1900 | |
| Entity Address, City or Town | San Francisco | |
| Entity Address, State or Province | CA | |
| Entity Address, Postal Zip Code | 94111 | |
| City Area Code | (415) | |
| Local Phone Number | 814-0927 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Title of 12(b) Security | Common Stock, $0.001 par value | |
| Trading Symbol | ONEM | |
| Security Exchange Name | NASDAQ | |
| Entity Emerging Growth Company | true | |
| Entity Ex Transition Period | false |
