| Cover | Apr. 28, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Apr. 28, 2021 |
| Entity Registrant Name | RESONANT INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-36467 |
| Entity Tax Identification Number | 45-4320930 |
| Entity Address, Address Line One | 10900 Stonelake Blvd |
| Entity Address, Address Line Two | Suite100, Office 02-130 |
| Entity Address, City or Town | Austin |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 78759 |
| City Area Code | 805 |
| Local Phone Number | 308-9803 |
| Title of 12(b) Security | Common Stock, $0.001 par value |
| Trading Symbol | RESN |
| Security Exchange Name | NASDAQ |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001579910 |
| Amendment Flag | false |
