| Cover | Oct. 12, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 12, 2021 |
| Entity File Number | 001-38608 |
| Entity Registrant Name | SUMMIT WIRELESS TECHNOLOGIES, INC. |
| Entity Central Index Key | 0001682149 |
| Entity Tax Identification Number | 30-1135279 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 6840 Via Del Oro Ste. 280 |
| Entity Address, City or Town | San Jose |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 95119 |
| City Area Code | 408 |
| Local Phone Number | 627-4716 |
| 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 $0.0001 per share |
| Trading Symbol | WISA |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
