| Document and Entity Information | Jun. 11, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jun. 11, 2021 |
| Current Fiscal Year End Date | --12-31 |
| Entity Registrant Name | ViewRay, Inc. |
| Entity Central Index Key | 0001597313 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-37725 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 42-1777485 |
| Entity Address, Address Line One | 2 Thermo Fisher Way |
| Entity Address, City or Town | Oakwood Village |
| Entity Address, State or Province | OH |
| Entity Address, Postal Zip Code | 44146 |
| City Area Code | 440 |
| Local Phone Number | 703-3210 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.01 |
| Trading Symbol | VRAY |
| Security Exchange Name | NASDAQ |
