| Document and Entity Information | Mar. 21, 2022 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001837014 |
| Document Type | 8-K |
| Document Period End Date | Mar. 21, 2022 |
| Entity Registrant Name | SmartRent, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-39991 |
| Entity Tax Identification Number | 85-4218526 |
| Entity Address, Address Line One | 8665 E. Hartford Drive |
| Entity Address, Address Line Two | Suite 200 |
| Entity Address, City or Town | Scottsdale |
| Entity Address, State or Province | AZ |
| Entity Address, Postal Zip Code | 85255 |
| City Area Code | 844 |
| Local Phone Number | 479-1555 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A Common Stock, $0.0001 par value per share |
| Trading Symbol | SMRT |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
