| Document and Entity Information | Feb. 13, 2023 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001713952 |
| Document Type | 8-K |
| Document Period End Date | Feb. 13, 2023 |
| Entity Registrant Name | VIVINT SMART HOME, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-38246 |
| Entity Tax Identification Number | 98-1380306 |
| Entity Address, Address Line One | 4931 North 300 West |
| Entity Address, City or Town | Provo |
| Entity Address, State or Province | UT |
| Entity Address, Postal Zip Code | 84604 |
| City Area Code | (801) |
| Local Phone Number | 377-9111 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A common stock, par value $0.0001 per share |
| Trading Symbol | VVNT |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
