| Cover | Jun. 03, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jun. 3, 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 |
