| Cover | Oct. 04, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 4, 2021 |
| Entity File Number | 1-37648 |
| Entity Registrant Name | Oncocyte Corporation |
| Entity Central Index Key | 0001642380 |
| Entity Tax Identification Number | 27-1041563 |
| Entity Incorporation, State or Country Code | CA |
| Entity Address, Address Line One | 15 Cushing |
| Entity Address, City or Town | Irvine |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92618 |
| City Area Code | (949) |
| Local Phone Number | 409-7600 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, no par value |
| Trading Symbol | OCX |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | true |
