| Document and Entity Information | Feb. 02, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001384101 |
| Document Type | 8-K |
| Document Period End Date | Feb. 2, 2021 |
| Entity Registrant Name | VERACYTE, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-36156 |
| Entity Tax Identification Number | 20-5455398 |
| Entity Address, Address Line One | 6000 Shoreline Court |
| Entity Address, Address Line Two | Suite 300 |
| Entity Address, City or Town | South San Francisco |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94080 |
| City Area Code | (650) |
| Local Phone Number | 243-6300 |
| Written Communications | true |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value, $0.001 per share |
| Trading Symbol | VCYT |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
